RBSE Solutions Class 11 Biology Chapter 22 Fruit and Seed

Rbse Class 11 Biology Chapter 22 Multiple Choice Objective Questions

Question 1. Main difference between Drupes and Berry is of
(a) Superior ovary
(b) Syncarpous ovary
(c) Stony endocarp
(d) Fleshy mesocarp
Answer: (c) Stony endocarp
In simple words: Drupes have a hard, stony inner layer (endocarp) that covers the seed, like a peach or mango. Berries, on the other hand, have a soft, fleshy pericarp all around, with the seeds typically loose inside.

🎯 Exam Tip: Remember that the endocarp is the innermost layer of the fruit wall, which is a key distinguishing feature for drupes.

Question 2. Schizocarpic fruits
(a) Burst after drying
(b) Burst into many mericarp
(c) Burst after drying when comes in contact of water
(d) None of the options
Answer: (d) None of the options
In simple words: Schizocarpic fruits split into separate, one-seeded parts called mericarps, but their fruit wall does not actively burst open. The seeds are released when the fruit wall naturally decays.

🎯 Exam Tip: Understand that "splitting" is different from "bursting" in fruit dehiscence; schizocarpic fruits are known for splitting into mericarps rather than bursting open.

Question 3. Which fruit has leathery epicarp, white fibres mesocarp and endocarp forms compartments?
(a) Hesperidium
(b) Pome
(c) Amphisarca
(d) Pepo
Answer: (a) Hesperidium
In simple words: Hesperidium fruits, like oranges or lemons, have a tough outer skin (leathery epicarp), a white fibrous middle part (mesocarp), and inner divisions (endocarp) that separate the juicy segments.

🎯 Exam Tip: Think of citrus fruits when you hear Hesperidium; their distinct leathery rind and juicy segments perfectly match this description.

Question 4. Which of the following is endospermic seed?
(a) Wheat
(b) Gram
(c) Pea
(d) Peanut
Answer: (a) Wheat
In simple words: Endospermic seeds keep a food storage tissue called endosperm when they are mature, which provides nourishment for the growing plant. Wheat is a good example of such a seed.

🎯 Exam Tip: Remember that monocot seeds like wheat and maize are typically endospermic, while many dicot seeds like gram and pea are non-endospermic because they absorb the endosperm during development.

Question 5. Which seed have perisperm in it?
(a) Coconut
(b) Black paper
(c) Wheat
(d) Gram
Answer: (b) Black paper
In simple words: Perisperm is the leftover part of the nucellus, which is a nutrient tissue found in the ovule of a plant. Black pepper seeds contain perisperm as a stored food source.

🎯 Exam Tip: Distinguish between endosperm (formed after double fertilization) and perisperm (derived from nucellus) as different types of food storage tissues in seeds.

Rbse Class 11 Biology Chapter 22 Very Short Answer Questions

Question 1. Define fruit.
Answer: A fruit is a ripened ovary that develops after fertilization in a flowering plant. Its main job is to protect the seeds inside and help them spread. Fruits are vital for plant reproduction and seed dispersal.
In simple words: A fruit is a mature ovary that holds the seeds of a plant, forming after the flower is fertilized.

🎯 Exam Tip: Always include "ripened ovary" and "after fertilization" in your definition of fruit to get full marks.

Question 2. Which is the edible part in apple?
Answer: The edible part of an apple is the fleshy thalamus. This part is actually the swollen receptacle of the flower, not the ovary itself. The true fruit (containing the seeds) is found inside the thalamus.
In simple words: The juicy part of an apple that we eat is the fleshy thalamus.

🎯 Exam Tip: Remember that an apple is a "false fruit" or "pome" because its edible portion comes from the thalamus, not directly from the ovary.

Question 3. Which part of flower actually responsible for formation of fruit?
Answer: The ovary is the part of the flower that is directly responsible for forming the fruit. After fertilization, the ovary wall develops into the fruit wall, which is called the pericarp, enclosing the seeds. The ovary protects the ovules that will become seeds.
In simple words: The ovary of a flower is the part that turns into the fruit after fertilization.

🎯 Exam Tip: Clearly state "ovary" as the key structure, as other floral parts may contribute to fruit formation but the ovary is the primary component.

Question 4. What do you mean by Aggregate fruit?
Answer: An aggregate fruit develops from a flower that has many separate carpels (parts of the pistil). All these carpels ripen together and gather as one unit on a shared stalk or receptacle. Each small fruitlet in an aggregate fruit comes from a single ovary of an apocarpous pistil, and the entire cluster is often called an etaerio. For example, a raspberry is an aggregate fruit.
In simple words: An aggregate fruit comes from one flower with many separate ovaries that join to form a single fruit, like a raspberry.

🎯 Exam Tip: Emphasize "single flower" and "many separate carpels" to correctly define an aggregate fruit.

Question 5. What do you mean by Multiple fruit?
Answer: A multiple fruit develops from an entire group of flowers (an inflorescence) that are packed closely together. All the flowers in the inflorescence, along with their parts, grow and fuse to form a single, larger fruit structure. Pineapples and mulberries are common examples of multiple fruits, showcasing how many small flowers combine into one. This is also sometimes called a composite fruit.
In simple words: A multiple fruit grows from a whole cluster of flowers that fuse together, like a pineapple.

🎯 Exam Tip: The key difference for multiple fruits is that they form from an "entire inflorescence" (a cluster of flowers), not just a single flower.

Question 6. What is the unique character of simple succulent fruit?
Answer: Simple succulent fruits are known for having a fleshy pericarp, which is the fruit wall. This fleshy pericarp is clearly divided into three distinct layers: the thin outer epicarp (skin), the middle mesocarp (fleshy part), and the inner endocarp (around the seed). This distinct layering is a hallmark of these juicy fruits.
In simple words: Simple succulent fruits have a juicy, fleshy outer wall that is divided into three layers: outer, middle, and inner.

🎯 Exam Tip: Mentioning the three distinct layers of the fleshy pericarp (epicarp, mesocarp, endocarp) is crucial for describing simple succulent fruits.

Question 7. Name the type of fruit found in Lady's finger and Dhatura plant:
Answer: The type of fruit found in Lady's finger (okra) and Dhatura plant is a capsule. A capsule is a dry dehiscent fruit that splits open in various ways to release its seeds. This type of fruit is common in many plant families.
In simple words: Lady's finger and Dhatura plants have a fruit type called a capsule.

🎯 Exam Tip: For specific examples, directly state the fruit type and optionally add how it dehisces (splits open) to demonstrate deeper knowledge.

Question 8. Which part of fruit is edible in Mango?
Answer: The edible part of a mango fruit is the fleshy mesocarp. The mesocarp is the middle layer of the fruit wall, which is thick and juicy in a mango. Mangoes are classified as drupes, which have a distinctive hard inner layer around the seed. This sweet and succulent mesocarp makes mangoes a popular fruit.
In simple words: We eat the fleshy mesocarp part of a mango, which is the juicy middle layer.

🎯 Exam Tip: Specify "fleshy mesocarp" for mango, as simply "mesocarp" might not convey its edible quality in this context.

Question 9. Define seed.
Answer: A seed is essentially a ripened ovule that develops after fertilization. It contains an embryo, which is a miniature plant, and often a stored food supply, all enclosed within a protective seed coat. Seeds are crucial for plant reproduction and survival as they allow plants to disperse and grow in new locations.
In simple words: A seed is a mature ovule, containing a tiny plant embryo and food, covered by a protective coat.

🎯 Exam Tip: Key terms like "ripened ovule," "embryo," and "protective seed coat" are essential for a complete definition of a seed.

Question 10. Which branch of science deals with study of structure, shape, size and viability of seed?
Answer: The branch of science that studies the structure, shape, size, and ability of seeds to grow (viability) is called spermology. This field is important for agriculture and plant conservation as it helps us understand seed quality and germination.
In simple words: Spermology is the science that studies seeds, including their parts, form, size, and whether they can grow.

🎯 Exam Tip: Remember "spermology" is the specific term for the study of seeds, just as botany is the study of plants in general.

Question 11. What do you mean by endospermic seeds?
Answer: Endospermic seeds are those that retain their endosperm as a reserve food material even at maturity. The endosperm provides nourishment to the developing embryo. Common examples include castor and maize, where the endosperm is clearly visible and functional after the seed has fully formed. These seeds rely heavily on the endosperm for germination.
In simple words: Endospermic seeds are seeds that still have food stored in their endosperm layer when they are ready to grow, like castor or maize.

🎯 Exam Tip: Explain that endospermic seeds keep the endosperm for food, and contrast them with non-endospermic seeds where the food is moved to the cotyledons.

Question 12. What do you mean by scutellum?
Answer: In monocot seeds, the scutellum is the single, shield-shaped cotyledon (seed leaf) that is found. Its primary role is to absorb nutrients from the endosperm and transfer them to the embryo during germination. The scutellum is an important part of a monocot seed's structure.
In simple words: The scutellum is the single, shield-shaped seed leaf found in monocot seeds, which helps feed the embryo from the endosperm.

🎯 Exam Tip: Always associate the scutellum with monocot seeds and its function of nutrient absorption from the endosperm.

Question 13. Aleurone layer of maize seed is made up of
Answer: The aleurone layer of a maize seed is rich in protein. It forms the outermost layer of the endosperm and plays a critical role in germination by producing enzymes that break down stored starch into sugars for the embryo. This layer is vital for seed viability and early seedling growth.
In simple words: The aleurone layer in maize seeds is mostly made of protein and helps the seed sprout by making enzymes.

🎯 Exam Tip: Specifically state that the aleurone layer is "protein rich" and mention its role in enzyme production for germination.

Rbse Class 11 Biology Chapter 22 Short Answer Questions

Question 1. What are the differences between lomentum and legume fruits?
Answer: The differences between lomentum and legume fruits are as follows:

🎯 Exam Tip: Clearly state how each fruit type dehisces or breaks apart, and provide a distinct example for each to illustrate the difference.

Question 2. What are the differences between Pome and Pepo fruits?
Answer: Pome and Pepo fruits have distinct differences in their development and structure:
Pome: This is a fleshy false fruit that grows from the swollen thalamus (the part of the flower stem below the ovary). The actual fruit, which contains the seeds, remains inside this fleshy thalamus. Pomes usually develop from two or more carpels that are fused together, with an inferior ovary. The edible part of a pome is primarily the fleshy thalamus, as seen in apples and pears. Apples are known for their crisp texture due to the fleshy thalamus.
Pepo: This is a large, fleshy fruit that develops from a flower with three fused carpels (tricarpellary), a single chamber (unilocular), and an inferior ovary, with parietal placentation (seeds attached to the outer walls). The seeds of a pepo are embedded directly in the juicy pulp. Examples include cucumber, watermelon, and bottle gourd. Pepos are typically large, firm fruits.
In simple words: Pomes (like apples) are false fruits where the edible part is the swollen stem, while Pepos (like watermelons) are large, fleshy fruits with seeds embedded in the pulp, growing from an inferior ovary.

🎯 Exam Tip: For differentiation questions, clearly define each type and highlight at least two contrasting features like origin (thalamus vs. ovary), placentation, or edible parts.

Question 3. How can you differentiate aggregate fruit from multiple fruit?
Answer: Differentiating between aggregate fruits and multiple fruits involves understanding their floral origin:
Aggregate Fruit: These fruits come from a single flower that has several separate carpels (simple pistils) which are not fused together. All these carpels ripen at the same time and collect on a common stalk to form a single fruit unit. Each small fruitlet comes from a distinct ovary. An example is a raspberry.
Multiple Fruit: These fruits develop from an entire inflorescence, which is a cluster of many flowers. All the individual flowers in the inflorescence, along with other floral parts, fuse together as they mature to form one large, single fruit. Pineapples and mulberries are typical examples of multiple fruits. They are formed from the entire collection of flowers on a stalk.
In simple words: Aggregate fruits form from one flower with many separate ovaries, while multiple fruits form from an entire cluster of flowers fusing together.

🎯 Exam Tip: The critical distinction is the number of flowers involved: one flower for aggregate fruits, and an entire inflorescence (many flowers) for multiple fruits.

Question 4. What do you mean by schizocarpic gruit ?
Answer: Schizocarpic fruits are a type of dry fruit that splits into several indehiscent (non-splitting), one-seeded units called mericarps. Unlike dehiscent fruits, the pericarp (fruit wall) of a schizocarpic fruit does not burst open. Instead, the seeds are liberated only when the pericarp decomposes. These fruits show an intermediate character between dehiscent and indehiscent dry fruits.
In simple words: Schizocarpic fruits break into many separate, one-seeded parts called mericarps, but the fruit wall itself does not burst open.

🎯 Exam Tip: Highlight that schizocarpic fruits "split into mericarps" but the pericarp "does not burst" for a precise definition.

Question 5. Explain structure of follicle with labeled diagram?
Answer: A follicle is a type of dry, dehiscent fruit that develops from a single carpel, which is unilocular (having one chamber) and typically a superior ovary. It looks similar to a legume fruit but differs because it dehisces (splits open) along only one suture (seam), usually the ventral suture. Examples of plants that produce follicles include Delphinium, Calotropis, Plumeria, and Larkspur. The splitting along one side allows the seeds to be released. Follicles are simple in structure, highlighting an efficient way to spread seeds.
In simple words: A follicle is a dry fruit that comes from a single ovary and splits open along only one side to release its seeds, like in Delphinium.

🎯 Exam Tip: Focus on "single carpel," "unilocular," and "dehisces along one suture only" as key characteristics of a follicle.

Question 6. Which type of inflorescence is responsible for the formation of sorosis fruit?
Answer: Sorosis fruits are formed from specific types of inflorescences: an entire spike, catkin, or spadix. In these inflorescences, the individual flowers fuse together, and their perianth (the outer floral leaves, often called tepals) becomes succulent. The central stalk of the inflorescence also becomes fleshy or woody, forming a compact mass. Examples include jackfruit, pineapple, and mulberry. In a pineapple, the perianth, stalk, and bracts all become fleshy and edible. In a mulberry, the edible part is mainly the fleshy perianth. This fusion of many floral parts creates a single, large fruit.
In simple words: Sorosis fruits form when an entire spike, catkin, or spadix inflorescence (a cluster of flowers) fuses together, making the whole structure fleshy and compact, like a pineapple.

🎯 Exam Tip: Remember to specify the inflorescence types (spike, catkin, spadix) and mention the fusion of flowers and their parts to form the compact sorosis fruit.

Question 7. What do you mean by Etaerio of drupes?
Answer: An etaerio of drupes is a type of aggregate fruit where numerous small drupelets (tiny drupes) are arranged on a fleshy thalamus (receptacle). Each individual drupelet develops from a separate carpel of a single flower, and they are all gathered together. This structure is formed from an apocarpous ovary (where carpels are distinct). Blackberries and raspberries are classic examples, where each 'berry' is actually a collection of many small drupes.
In simple words: An etaerio of drupes is when many small drupe fruits are grouped together on a fleshy base, like in a blackberry or raspberry.

🎯 Exam Tip: Define an etaerio of drupes as an "aggregate of drupes" formed from an "apocarpous ovary" and clustered on a "fleshy thalamus."

Question 8. Explain structure of dicot seed with labeled diagram.
Answer: Dicotyledonous seeds, such as gram, pea, castor, and beans, are characterized by having two cotyledons, which serve as a store of food needed during seed germination. A typical dicotyledon seed consists of the following structures:
1. Seed Coat: This is the protective outer layer of the seed. It has two parts: the tough outer testa and the thinner inner tegmen. The seed coat shields the embryo from damage and drying out.
2. Embryo: The embryo is the miniature plant inside the seed. It consists of an embryonal axis with a plumule (which forms the shoot) at one end and a radicle (which forms the root) at the other. It also has two cotyledons. The two cotyledons store food and help transfer it to the developing embryo. These cotyledons can be very large and fleshy, containing all the food reserves.
3. Endosperm: In dicot seeds like gram and pea, the endosperm is present in the early stages but is often completely consumed during embryo development. Thus, mature dicot seeds are usually non-endospermic, meaning the cotyledons have taken over the storage function. However, in seeds like castor, a fleshy endosperm is present even in the mature seed, making it endospermic.
In simple words: A dicot seed has a protective outer coat, an embryo (tiny plant) with two food-storing leaves called cotyledons, and sometimes leftover endosperm for food.

🎯 Exam Tip: When explaining dicot seed structure, clearly describe the seed coat (testa and tegmen), the embryo (radicle, plumule, cotyledons), and mention the role of cotyledons in food storage for non-endospermic dicots.

Question 9. Explain structure of monocot seed (Maize) with labeled diagram.
Answer: Monocotyledonous seeds like maize (corn), wheat, and rice are important for food storage and germination. These are technically caryopsis fruits, not just seeds, because the seed coat is fused with the fruit wall. A maize grain is flat and oblong, showing a yellowish upper part marking the endosperm, and a smaller whitish area at the bottom containing the embryo. Hilum and micropyle are usually absent. In a longitudinal section, a maize seed shows these structures:
1. Seed Coat: This is a thin, yellow layer fused with the pericarp (fruit wall). This fusion provides a robust protective covering for the seed.
2. Endosperm: Maize seeds are endospermic, meaning the mature seed retains its endosperm. The endosperm is the largest part of the grain, making up about two-thirds of it. It consists of two main parts: a flattened, yellowish or whitish outer part known as the aleurone layer (rich in protein and attached to the seed coat) and an inner starch-rich storage region. This endosperm provides ample food for the developing seedling.
3. Embryo: The embryo occupies the remaining one-third of the grain. It consists of a single large cotyledon called the scutellum, which is laterally positioned. The part of the scutellum in contact with the endosperm is called the epithelial layer. The plumule (forms the shoot) is covered by a coleoptile, and the radicle (forms the root) is covered by a coleorhiza. The epithelial layer produces Gibberellins hormone for mobilizing food reserve of endosperm at the time of seed germination. The embryo is vital for forming the new plant.
In simple words: A maize seed (monocot) has a seed coat fused to the fruit wall, a large endosperm for food storage (with a protein-rich outer aleurone layer), and an embryo with a single seed leaf called the scutellum.

🎯 Exam Tip: For monocot seeds like maize, emphasize the fusion of the seed coat with the pericarp (making it a caryopsis), the large endosperm for food, and the single cotyledon (scutellum).

Rbse Class 11 Biology Chapter 22 Long Answer Type of Questions

Question 1. What do you mean by fruit? Explain dry fruits with labeled diagram and examples.
Answer: A fruit is a mature ovary that forms after a flower undergoes pollination and fertilization. The wall of the ovary develops into the fruit wall, known as the pericarp. Fruits contain seeds, which are ripened ovules. The study of fruits is called pomology.

Simple Fruit: A simple fruit develops from a single ovary. This ovary can have one carpel, many carpels, or fused carpels. Simple fruits are the largest and most varied group and are divided into two main categories:
(a) Simple Dry Fruit
(b) Simple Fleshy or Succulent Fruit

(a) Simple Dry Fruit: In these fruits, the pericarp (fruit wall) is dry and not divided into three distinct layers. Dry fruits are further classified based on whether they dehisce (split open) or remain indehiscent (do not split).

Types of Dry Simple Fruits:
1. Simple Dry Dehiscent Fruit or Capsular: These fruits automatically split open when ripe to release their seeds.
(i) Legume or Pod: Develops from a single carpel and a superior ovary with marginal placentation. It splits along both its dorsal and ventral sutures from apex to base. Examples include pea, gram, and beans.
(ii) Follicle: Develops from a single carpel, a unilocular superior ovary, and splits along only one suture. Examples include Delphinium and Calotropis.
(iii) Siliqua: Forms from two fused carpels, a superior ovary, and appears bilocular due to a false septum with parietal placentation. It splits along both sutures from base to apex, releasing many seeds attached to a replum. Examples: mustard and radish.
(iv) Silicula: A short and broad siliqua with fewer seeds. Examples: Capsella bursapastoris (Shepherd's purse) and Iberis amara (Candytuft).
(v) Capsule: Develops from a syncarpous superior or inferior ovary. It dehisces (splits) by pores or valves. Examples: Papaver (poppy), Datura, and Lady's finger.

2. Simple Dry Schizocarpic Fruit: These fruits form from multiple carpels that are fused (syncarpous), with one or many chambers. They split into several indehiscent (non-splitting), one-seeded units called mericarps. The pericarp does not burst; seeds are liberated after the pericarp decomposes. They are intermediate between dehiscent and indehiscent fruits.
(i) Cremocarp: Develops from two fused carpels, a bilocular inferior ovary, and splits longitudinally into two indehiscent mericarps that remain attached to a carpophore (a thread-like structure). Examples: Coriandrum and Foeniculum.
(ii) Lomentum: Develops from a single carpel, a unilocular superior ovary, and is similar to a legume. The pod constricts between seeds, forming many one-seeded segments (mericarp). It splits along both sutures. Examples: Tamarind and Mimosa.
(iii) Carcerulus: Forms from two or more fused carpels, a multi-chambered superior ovary. Initially, each chamber has many seeds, but false septa divide it into one-seeded locules (mericarp). The entire fruit is enclosed by a persistent calyx and breaks into four or more indehiscent parts. Examples: Hollyhock and Ocimum.
(iv) Double Samara: Develops from two fused carpels, a syncarpous superior ovary. After maturity, the fruit splits into two one-seeded, winged structures. Examples: Maples and Fraxinus.
(v) Regma: Forms from three to five carpels, a syncarpous superior ovary. It is made of three to five locules called Coccus. Upon maturation, each coccus bursts with one seed. Examples: Castor and Geranium.

3. Simple Dry Indehiscent Fruit or Achenial fruits: These fruits do not split open automatically when ripe. Their seeds are released only after the decomposition of the pericarp.
(i) Achene: This is a one-seeded fruit that develops from a unilocular, monocarpellary, superior ovary. Its pericarp is thin, hard, and leathery, remaining free from the seed coat. Examples: Mirabilis and Narvelia. It is similar to a caryopsis but the pericarp is not completely fused with the seed coat.
(ii) Caryopsis: A small, indehiscent, one-seeded fruit that develops from a monocarpellary ovary. In caryopsis, the pericarp is fused with the seed coat. The seed completely fills the chamber. Examples: Wheat, Rice, and Maize.
(iii) Cypsela: Forms from two fused carpels, a syncarpous inferior ovary. It has a persistent, hairy calyx that forms a 'pappus' which aids in seed dispersal like a parachute. It contains only one seed, and the pericarp and seed coat remain free. Examples: Sunflower and Marigold.
(iv) Samara: A dry, indehiscent, one-seeded winged fruit. It develops from two fused carpels, a syncarpous ovary. The pericarp is modified into a flattened, wing-shaped structure for dispersal. Example: Holoptelea integrifolia (Chilbil).
(v) Nut: A large, indehiscent, one-seeded fruit. It develops from two or more carpels, a unilocular superior ovary. The fruit wall (pericarp) becomes hard, stony, or woody at maturity. Examples: Litchi, chestnut, and cashew nut. In litchi, the fleshy aril (a specialized outgrowth from the seed) is the edible part, while in other nuts, the seed itself is edible.
In simple words: A fruit is a ripened ovary. Dry fruits have a pericarp that isn't fleshy. They can either split open when ripe (like legumes and capsules), break into smaller pieces (like cremocarps and lomentums), or not open at all, releasing seeds only when the fruit decays (like achenes, caryopses, and nuts).

🎯 Exam Tip: When explaining dry fruits, clearly distinguish between dehiscent, schizocarpic, and indehiscent types, providing one clear example for each sub-category for comprehensive answers.

RBSE Class 11 Biology Chapter 22 Long Answer Type of Questions

Question 1. What do you mean by fruit? Explain dry fruits with labeled diagram and examples.
Answer: A fruit is formed when the ovary of a flower ripens after pollination and fertilization. The fruit wall, called pericarp, is a changed form of the ovary wall. Fruits contain seeds, which are ripened ovules. The study of fruits in horticulture is called pomology. Fruits are a crucial part of plant reproduction, protecting seeds as they develop.
A simple fruit comes from a single ovary. This ovary can have one carpel, many carpels joined together, or many carpels that are separate. Simple fruits are the largest and most varied group of fruits. They are divided into:
(a) Simple Dry Fruit
In simple dry fruits, the pericarp (fruit wall) is usually dry and does not have three distinct layers.
Types of dry simple fruits:
1. Simple Dry Dehiscent Fruit or Capsular: These fruits open automatically when ripe to release their seeds.
(i) Legume or pod: This fruit comes from a single carpel and has a single chamber, with the ovary positioned at the top. The seeds are arranged along the margin. It opens along both its top and bottom seams from the tip to the base. Examples include peas, gram, and beans (from the Papilionaceae family).
(ii) Follicle: This fruit develops from a single carpel, has one chamber, and a superior ovary. It is similar to a legume but opens only along one seam. Examples are Delphinium, Calotropis, Plumeria, and Larkspur.
(iii) Siliqua: This fruit develops from two joined carpels, has one chamber (but appears to have two due to a false wall), and a superior ovary. The seeds are attached to the side walls. It opens along both seams from base to tip, leaving seeds attached to a central frame. Examples are mustard and radish.
(iv) Silicula: This is a short and wide siliqua with relatively few seeds. Examples include shepherd's purse and candytuft.
(v) Capsule: This fruit develops from a joined ovary (superior or inferior) with multiple carpels. It can open through pores or split into two or more parts. Examples are poppy (poricidal capsule), Datura, cotton, and lady's finger.
2. Simple Dry Schizocarpic Fruit: These fruits come from an ovary with multiple carpels, joined together, and having many chambers (superior or inferior). They split into several separate, dry units called mericarps, each containing one or more seeds. They are a type of fruit that doesn't fully burst open, but also doesn't stay completely closed; the seeds are released when the pericarp decays.
(i) Cremocarp: This fruit develops from an ovary with two carpels, joined together, having two chambers, and an inferior ovary. It splits lengthwise into two separate mericarps that stay attached to a central thread-like structure. Examples include coriander and fennel.
(ii) Lomentum: This fruit develops from a single carpel, has one chamber, and a superior ovary. It resembles a legume, but the pod is pinched between the seeds, forming many small, one-seeded parts. It opens along both seams. Examples are tamarind, touch-me-not plant, Cassia fistula, acacia, and peanut.
(iii) Carcerulus: This fruit develops from an ovary with two or more carpels, joined together, and a superior ovary, having four or more chambers. Each chamber initially contains many seeds, but later, false walls divide them so each part holds just one seed (mericarp). The fruit stays enclosed by the calyx and breaks into four or more separate parts. Examples include hollyhock, Ocimum, Salvia, and Abutilon.
(iv) Double Samara: This fruit develops from an ovary with two carpels, joined together, and a superior ovary. When mature, it splits into two separate, winged seeds. Examples are maple and ash trees.
(v) Regma: This fruit develops from an ovary with three to five carpels, joined together, and a superior ovary. It consists of three to five separate parts, called coccus. When ripe, each coccus bursts open with one seed. Examples are castor bean and geranium.
2. Simple Dry Indehiscent Fruit or Achenial fruits: These fruits do not burst open automatically when ripe. Their seeds are released only after the fruit wall decays.
(i) Achene: This fruit has only one seed and develops from a single-chambered, single-carpel, superior ovary. Its fruit wall is thin, hard, and leathery, and remains separate from the seed coat. Examples are Mirabilis and Narvelia. It is similar to a caryopsis, but the fruit wall is not fully fused with the seed coat.
(ii) Caryopsis: This is a small, dry, single-seeded fruit. It develops from a single-carpel ovary where the fruit wall is completely fused with the seed coat, and the seed fills the entire chamber. Examples are wheat, rice, and maize.
(iii) Cypsela: This fruit develops from an ovary with two carpels, joined together, and an inferior ovary. It has a persistent, hairy calyx (pappus) that acts like a parachute for seed dispersal. It contains only one seed, and the fruit wall and seed coat remain separate. Examples include sunflower, marigold, and dandelion (from the Asteraceae family).
(iv) Samara: This is a dry, single-seeded fruit with a wing-like structure. It develops from an ovary with two carpels, joined together, and a superior ovary. The fruit wall changes into a flattened, winged shape that helps the fruit disperse by wind. An example is Holoptelea integrifolia (Chilbil).
(v) Nut: This is a large, dry fruit with one seed that does not open. It develops from an ovary with two or more carpels, which can be separate or joined, and a superior ovary. The fruit wall becomes hard, stony, or woody when ripe. Examples include litchi, chestnut, and cashew nut. For litchi, the outer fruit skin (epicarp) and middle layer (mesocarp) become leathery, and the inner layer (endocarp) is thin. The fleshy aril (a special growth from the seed) is the edible part of litchi. In other nuts, the seed itself is the edible part.
(b) Fleshy or Succulent Simple Fruits:
These fruits have a fleshy fruit wall that is divided into three parts: the outer epicarp, the middle mesocarp, and the inner endocarp. These fleshy (or succulent) fruits are further classified into seven types:
1. Drupe (Stone fruit): This fruit has one or many seeds and develops from an ovary with one or more carpels (either separate or joined) and a superior ovary. The pericarp is made of a thin outer skin (epicarp), a fleshy, edible, and fibrous middle layer (mesocarp), and a hard, stony inner layer (endocarp) that protects the seed. Examples include mango, coconut, almond, and peach. In a coconut, the epicarp is hard, the mesocarp is fibrous, and the endocarp is stony; the endosperm is the edible part.
2. Berry: This is a fleshy fruit with one or many seeds. It has a large, soft, and juicy pericarp that develops from a joined ovary with seeds attached axially or parietally. Seeds are initially attached to the placenta but become loose in the pulp when ripe. The outer skin of berries often becomes brightly colored as it ripens. Berries are one of the most common fruit types. Examples include tomato, banana, brinjal, grapes, areca nut, guava, and papaya.
3. Pepo: This is a large, fleshy fruit that develops from an ovary with three carpels, joined together, a single chamber, and an inferior ovary, with seeds attached parietally. The outer skin (epicarp) forms a thin peel, while the middle (mesocarp) and inner (endocarp) layers are fleshy and pulpy. Seeds are embedded in this pulp. Examples are cucumber, watermelon, bottle gourd, and ridge gourd.
4. Pome: This is a fleshy false fruit that grows from the fleshy thalamus. The true fruit, which contains the seeds, remains inside. It develops from an ovary with two or more carpels, joined together, and an inferior ovary. The fleshy thalamus is the edible part. Examples include apple and pear. The crisp texture of apples makes them a refreshing pome fruit.
5. Hesperidium: This is a berry with a firm, hard, and leathery fruit wall, as seen in citrus fruits. It has many fleshy chambers and develops from an ovary with multiple carpels, joined together, many chambers, and a superior ovary with axial placentation. The epicarp is leathery and has many glands that produce aromatic oil. The mesocarp is made of white fibers and is fused with the epicarp; together, they form the rind. The endocarp is thin and papery, forming inner compartments that project inwards. The inner wall of the endocarp produces many juicy, succulent hairs, which are the edible part of the fruit. Examples include lemon, orange, and grapefruit.
6. Balausta: This is a fleshy fruit with many chambers and many seeds. It develops from an ovary with multiple carpels, joined together, and an inferior ovary. The fruit wall is leathery and tough, forming a firm rind. Two rows of carpels are positioned one above the other, with seeds attached irregularly. The outer seed coat (testa) is succulent and edible. Pomegranates are a classic example of this unique fruit type.
7. Amphisarca: This is a fleshy fruit with many seeds and a stony or woody fruit wall. It develops from an ovary with joined carpels, many chambers, and a superior ovary. The placenta and the inner pulpy pericarp are the edible parts. An example is wood apple.

🎯 Exam Tip: When describing fruit types, always clearly state the ovary type (superior/inferior), the carpel number, how the pericarp is differentiated, and provide at least two common examples to score full marks.

Fleshy or Succulent Simple Fruits:

(1) Drupe (Stone fruit): A drupe is a fruit with one or many seeds that grows from a flower with a single or many fused ovaries. Its outer wall (pericarp) has three layers: a thin outer skin (epicarp), a fleshy, often edible middle part (mesocarp), and a hard, stony inner layer (endocarp) that protects the seed inside. Examples include mango (Mangifera indica), coconut (Cocos nucifera), almond (Primus amygdalis), peach (Primus persica), and Zizvphus. For coconut, the outer skin is hard, the middle part is fibrous, and the stony inner part has edible endosperm. The hard endocarp is what gives these fruits the name 'stone fruits'.

(2) Berry: A berry is a fleshy fruit that has one or many seeds. It has a large, soft and juicy pericarp. It grows from a syncarpous ovary with axial or parietal placentation. Seeds are initially attached to the placenta but become loose in the pulp when mature. The outer skin (epicarp) of berries usually gets brightly colored when ripe. Examples include tomato (Lycopersicum esculentum), banana (Musa paradisiaca), brinjal (Solanum melongena), grapes (Vitis vinifera), supari (Piper), guava (Psidium gnajava), and papaya (Cariaca papaya). Berries are often consumed whole due to their soft texture.

(3) Pepo: A pepo is a large, fleshy fruit that grows from a flower with three fused carpels, a single chamber, and an inferior ovary, with seeds attached to the outer wall (parietal placentation). The outer skin (epicarp) is thin, while the middle (mesocarp) and inner (endocarp) parts are fleshy and pulpy. The seeds are embedded in this pulp. Examples include cucumber (Cucumis sativus), watermelon (Citrullus lanatus), bottle gourd (Lagenaria siceraria), and ridge gourd. Pepo fruits are typically large and watery.

(4) Pome: A pome is a fleshy false fruit that develops from the fleshy thalamus, which is the edible part. The actual fruit, containing the seeds, remains inside. It forms from two or more carpels that are fused (syncarpous) and an inferior ovary. Examples include apple (Pyrus malus) and pear (Pyrus communis). Pomes are characterized by their edible fleshy part coming from the flower base rather than the ovary itself.

(5) Hesperidium: A hesperidium is a type of berry that has a firm, hard, and leathery outer skin (pericarp), typical of citrus fruits. It is a many-chambered fleshy fruit that develops from a flower with multiple fused carpels, many chambers (multilocular), and a superior ovary with seeds along the central axis (axial placentation). The outer skin (epicarp) is leathery and has many glands that produce aromatic oil. The middle part (mesocarp) is made of white fibers and is fused with the epicarp to form the rind. The inner part (endocarp) is thin and papery, forming compartments that project inwards, and its inner wall produces many juicy, succulent hairs, which are the edible part of the fruit. Examples are lemon (Citrus aurantifolia), orange (Citrus reticulata), and chakotra. Hesperidium fruits are known for their distinct aroma and segmented edible flesh.

(6) Balausta: A balausta is a fleshy fruit with many chambers and many seeds. It develops from a flower with multiple fused carpels (multicarpellary, syncarpous) and an inferior ovary. The pericarp (fruit wall) is leathery or tough, forming a firm rind. Two rows of carpels are positioned one above the other, irregularly bearing seeds. The outer seed coat (testa) is succulent and edible. Pomegranates are classic examples of balausta fruits, known for their numerous juicy seeds.

(7) Amphisarca: An amphisarca is a fleshy fruit with many seeds. It has a stony or woody outer wall (pericarp) and develops from a fused, many-chambered, superior ovary. The edible part is the placenta and the inner pulpy pericarp. Wood apple (Aegle marmelos) is an example. These fruits are typically large with a hard shell.

Question 4. Explain various types of aggregate and composite fruits with labeled diagram and examples.
Answer:

Aggregate Fruits: These fruits grow from a flower with multiple unfused carpels (multicarpellary apocarpous ovary), where all carpels ripen together. They are collected as a single unit on a shared base (receptacle). Each small fruitlet in an aggregate fruit comes from a single ovary of an unfused pistil. These groups of fruitlets are called etaerio. There are four main types:

(a) Etaerio of achenes: This is a cluster of achenes (small, dry, one-seeded fruits) on a common thalamus (flower base). This fruit grows from an unfused ovary with a fleshy or spongy thalamus. The achenes are embedded in the thalamus. Examples include strawberry (fruitlets scattered on the enlarged fleshy thalamus), rose (achenes inside a cup-shaped thalamus), and Nelumbium (lotus, achenes embedded in a top-shaped spongy thalamus). In strawberries, the edible part is the fleshy thalamus that holds the achenes.

(b) Etaerio of follicles: This consists of many follicles (dry, single-chambered fruits that open along one side) clustered on a stem (pedicel). Each follicle develops from an unfused, multiple-carpelled ovary. They are arranged on an enlarged thalamus, and the number of fruitlets varies. Examples include Calotropis and Catheranthus (having two follicles) and Champa (Michelia) (having many follicles). These fruits burst open to release their seeds.

(c) Etaerio of berries: This is an aggregate of berries crowded together on a thick base (thalamus), forming a single fruit. The edible part in mulberry is the fleshy perianth. These fruits grow from a flower with multiple unfused ovaries. They are single-seeded, juicy, pulpy, and embedded in the thalamus. An example is custard apple (Annona squamosa). These fruits are often sweet and soft when ripe.

Multiple (or Composite) Fruits:

These are also known as infrutescence fruits. They develop from an entire flower cluster (inflorescence) along with its different parts. There are two main types:

(a) Sorosis: This fruit develops from a whole spike, catkin, or spadix inflorescence, where the flowers fuse with their fleshy perianth (petals). The axis of the inflorescence becomes fleshy or woody, forming a compact mass. Examples include jackfruit (Artocarpus heterophyllus), pineapple (Ananas comosus), and mulberry (Morns indica). In pineapple, the perianth, the axis bearing flowers, and the bracts all become fleshy and succulent, forming the edible part. In mulberry, the fleshy perianth is the edible part. Sorosis fruits are large and made of many small fruits joined together.

(b) Syconus: This fruit grows from an entire hypanthodium inflorescence. In a syconus, the edible part of the fruit is a hollow or pear-shaped fleshy receptacle. Examples include fig (Ficus carica), banyan (Ficus benghalensis), and peepal (Ficus religiosa). These fruits are unique because their flowers are inside a fleshy container.

🎯 Exam Tip: When listing examples, remember to include both the common and botanical names for better clarity and full marks.

🎯 Exam Tip: When presented with a table of fruits, focus on remembering the common name, botanical name, fruit type, and edible part, as these are key details often tested.

Question 5. Explain various types of dry indehiscent fruits with labeled diagrams and examples.
Answer:

Simple Dry Indehiscent Fruit or Achenial Fruits: These fruits do not open automatically when ripe. Their seeds are released only after the fruit wall (pericarp) breaks down. These fruits are important for understanding natural seed dispersal methods.

(i) Achene: This is a single-seeded, dry fruit that does not open. It grows from a flower with a single carpel and a superior ovary. The pericarp is thin, hard, and leathery, remaining separate from the seed coat. It is similar to a caryopsis, but in an achene, the pericarp and seed coat are not fully fused. Examples include Mirabilis and Narvelia. Achenes are often dispersed by wind or animals.

(ii) Caryopsis: This is a small, dry fruit that does not open and has a single seed. It develops from a monocarpellary ovary. In a caryopsis, the pericarp (fruit wall) is fused with the seed coat, and the seed completely fills the inner chamber. Examples include wheat, rice, and maize. This fusion of pericarp and seed coat is a key identifying feature.

(iii) Cypsela: This fruit develops from a bicarpellary, syncarpous, and inferior ovary. It has a persistent, hairy calyx that forms a 'pappus', which acts like a parachute to help disperse the seed. It contains only one seed, and the pericarp and seed coat remain separate. Examples include plants from the Asteraceae family like sunflower, marigold, and dandelion. The pappus is a distinctive feature of cypsela fruits, making them easily airborne.

(iv) Samara: This is a dry, indehiscent, single-seeded fruit with wings. It develops from a bicarpellary, syncarpous, superior ovary. The pericarp (fruit wall) is modified into a flattened, wing-shaped structure that helps in fruit dispersal, especially by wind. An example is Holoptelea integrifolia (Chilbil). The wings allow the seeds to travel further from the parent plant.

(v) Nut: A nut is a large, dry fruit that does not open and has a single seed. It develops from a flower with two or more carpels, a single chamber, and a superior ovary. The fruit wall (pericarp) becomes hard, stony, or woody when mature. Examples include litchi (Litchi chinensis), chestnut, and cashewnut (Anacardium occidentale). In litchi, the outer skin (epicarp) and middle part (mesocarp) together become leathery, and the inner part (endocarp) is thin and membranous. The edible part of litchi is the fleshy aril, which is a special outgrowth from the seed that partly or completely covers it. In other nut fruits, the seed itself is the edible part. Nuts are known for their hard outer shells that protect the kernel inside.

🎯 Exam Tip: When describing dry indehiscent fruits, always mention if the pericarp is fused with the seed coat or not, as this is a key differentiating factor.

Question 7. Explain structure of monocot seed with labeled diagram and examples.
Answer:

Seeds are the result of fertilization and are a key characteristic of all seed-bearing plants (spermatophytes), including gymnosperms and angiosperms. They contain an embryo, which is a tiny plant body. While gymnosperms have exposed seeds, angiosperms enclose their seeds within a fruit. Seeds from different plants vary in size and shape, but their basic structure is generally similar. A mature seed has two main parts: the seed coat and the embryo. Seeds serve as a vital mechanism for plant reproduction and survival.

Seed Coat: The outer covering of a seed is called the seed coat. It forms from the integuments (protective layers) of the ovule. The seed coat usually has two layers: a tough outer layer called the testa and a thin, membranous inner layer called the tegmen. The seed attaches to the fruit wall (pericarp) by a short stalk called the funiculus, leaving a scar called the hilum when detached. A small opening, the micropyle, is also visible, which is important for water absorption.

Embryo: The seed coat encloses the embryo, which is made of a radicle, plumule, and cotyledons. The radicle grows into the primary root, and the plumule develops into the aerial shoot. The number of cotyledons (seed leaves) can be one (in monocotyledons) or two (in dicotyledons). Cotyledons often store food or perform photosynthesis in young seedlings. The part of the embryonic axis between the radicle and the cotyledon attachment point is called the hypocotyl, while the part between the plumule and the cotyledon attachment point is the epicotyl. Seeds are classified into two types based on the number of cotyledons.

Monocotyledonous Seed (Maize): Maize (corn), wheat, and rice are important monocotyledonous seeds. They contain only one cotyledon, which serves as food storage for seed germination. These are technically caryopsis fruits, not true seeds, because the seed coat is fused with the fruit wall. The corn grain is a flat, oblong shape, showing a yellowish upper part (marking the endosperm's position) and a small whitish area below (containing the embryo). The outer two-thirds of the grain is endosperm, and the inner one-third is embryo. Unlike dicot seeds, a true hilum and micropyle are usually absent. In a longitudinal section of a maize seed, the following structures are observed:

1. Seed coat: This is a thin yellow layer surrounding the seed, formed by the fusion of the pericarp and seed coat. This fusion provides extra protection to the delicate embryo inside.

2. Endosperm: Maize is an endospermic seed because endosperm is present even in the mature seed. It is the upper, flattened yellow or white part that stores starch as food. The outer part of the endosperm, attached to the seed coat, is made of protein and is called the aleurone layer. The inner part of the endosperm is rich in starch. The endosperm is a crucial nutrient source for the developing seedling.

3. Embryo: The embryo in maize has a single large, lateral cotyledon called the scutellum. The surface of the scutellum that touches the endosperm is called the epithelial layer. This epithelial layer produces Gibberellins hormone, which helps mobilize food reserves from the endosperm during seed germination. The embryo is positioned to absorb nutrients from the endosperm.