Samacheer Kalvi Class 11 Bio Botany Solutions Chapter 3 Vegetative Morphology

Part-I

I. Choose The Right Answer:

 

Question 1. Roots are
(a) Descending-positively geostrophic negatively phototrophic
(b) Descending-positively geostrophic negatively phototrophic
(c) Ascending, positively geostrophic negatively phototrophic
(d) Ascending, negatively geostrophic negatively phototrophic
Answer: (b) Descending-positively geostrophic negatively phototrophic
In simple words: Roots grow downwards, following gravity (positively geostrophic), and away from light (negatively phototrophic). This helps them anchor the plant and absorb water and nutrients from the soil.

🎯 Exam Tip: Remember that roots grow towards gravity and away from light, which is crucial for their function.

 

Question 2. When the root is thick and fleshy but does not take a definite shape is said to be
(a) Nodulose root
(b) Tuberous root
(c) Moniliform root
(d) Fasciculated root
Answer: (b) Tuberous root
In simple words: A tuberous root is a swollen, fleshy root that stores food but does not have a regular, fixed shape. It grows in various forms.

🎯 Exam Tip: Distinguish between different types of fleshy roots by their shape and origin. Tuberous roots are irregularly shaped food storage roots.

 

Question 3. Example for negatively geotrophic roots
(a) Ipomoea, Dahlia
(b) Asparagus, Ruellia
(c) Vitis, Portulaca
(d) Avicennia, Rhizophora
Answer: (d) Avicenniarhizophora
In simple words: Negatively geotrophic roots grow upwards, against gravity. Avicennia (a mangrove plant) has such roots, called pneumatophores, which help the plant breathe in marshy soil.

🎯 Exam Tip: Focus on exceptions to general plant rules, like roots growing upwards (negatively geotropic) in specific habitats such as mangroves for gas exchange.

 

Question 4. Cureumaamada curcuma domestica Asparagus maranta are examples of
(a) Tuberous root
(b) Moniliform root
(c) Nodulose root
(d) Nodulose root
Answer: (d) Nodulose root
In simple words: Nodulose roots are a type of modified root where the tips swell up to store food, giving them a beaded appearance. These plants show this special root structure.

🎯 Exam Tip: When identifying root modifications, pay attention to the specific swellings or shapes as they often indicate a storage function.

 

Question 5. Bryophyllum and Dioscorea are examples for
(a) Foliar bud, apical bud
(b) Foliar bud, cauline bud
(c) Cauline bud, apical bud
(d) Cauline bud, fohar bud
Answer: (b) Foliar bud, cauline bud
In simple words: Bryophyllum forms buds on its leaves (foliar buds), while Dioscorea forms buds on its stem (cauline buds). These buds help the plants reproduce.

🎯 Exam Tip: Understand how different plants use various parts like leaves and stems for vegetative propagation, with specific examples for each type of bud.

Two Marks

 

Question 6. Why lateral roots are endogenous?
Answer: Lateral roots arise from the pericycle, which is an inner part of the root. Because they develop from inside the existing root structure, they are called endogenous in origin. This internal development helps protect the delicate new root tissues as they grow outwards.
In simple words: Lateral roots grow from a deep, inner layer of the main root called the pericycle. This means they start from inside, which is why they are called endogenous.

🎯 Exam Tip: Remember that "endogenous" means originating from within, specifically from the pericycle layer in the case of lateral roots.

 

Question 7. Write the similarities and differences between
1. Avicennia & trapa
2. Banyan & silk cotton
3. Fusiform and Napiform root
Answer:
I. Avicennia & Trapa

II. Banyan & Silk cotton
III. Fusiform and Napiform root
In simple words: Avicennia lives in wet, salty areas and has roots that grow up to breathe, while Trapa lives in water and has roots for making food. Banyan trees have hanging roots for support, and Silk Cotton trees have wide, flat roots at the bottom for stability. Fusiform roots are thick in the middle and thin at the ends (like a radish), and Napiform roots are wide at the top and become thin very quickly (like a beetroot).

🎯 Exam Tip: When comparing, always highlight two key distinguishing features and provide relevant examples for each type.

 

Question 8. How root climbers differ from stem climbers?
Answer:

In simple words: Root climbers use special small roots to hold onto things and climb up. Stem climbers, on the other hand, wrap their entire stem around a support to grow upwards.

🎯 Exam Tip: Clearly state the climbing mechanism and provide distinct examples for both root and stem climbers to demonstrate understanding.

 

Question 9. Compare sympodial branching with monopodial branching.
Answer:

In simple words: In sympodial branching, the main growing tip stops, and side branches take over. In monopodial branching, the main growing tip keeps growing tall and strong, making many side branches.

🎯 Exam Tip: Focus on whether the terminal bud continues to grow (monopodial) or stops and is replaced by lateral buds (sympodial) as the key difference.

 

Question 10. Compare pinnate unicostate and palmate multicoastate venation?
Answer:

In simple words: Pinnate unicostate venation has one main vein in the middle, like a feather. Palmate multicoastate venation has several main veins spreading out from one point, like fingers on a palm. These veins help carry water and food in the leaf.

🎯 Exam Tip: Use visual comparisons like "feather-like" or "palm-like" to remember and explain the difference between pinnate and palmate venation.

Part - II

11th Bio Botany Guide Vegetative Morphology Additional Important Questions And Answers

 

Question 1. The study about external features of an organism is known as .....................
(a) morphology
(b) anatomy
(c) physiology
(d) taxonomy
Answer: (a) morphology
In simple words: Morphology is the study of how living things look on the outside. It focuses on their shape and physical features.

🎯 Exam Tip: Remember that morphology focuses on visible structures, while anatomy deals with internal structures.

 

Question 2. Onion lettuce, fennel, radish, cabbage are examples of
(a) perennial
(b) annual
(c) centennial
(d) biennial
Answer: (d) biennial
In simple words: Biennial plants live for two years. In the first year, they grow leaves, stems, and roots. In the second year, they flower, produce seeds, and then die.

🎯 Exam Tip: Classify plants by their life cycle duration: annuals complete in one year, biennials in two, and perennials live for more than two years.

 

Question 3. The branch of science that deals with the classification of organisms is called as ......................
(a) taxonomy
(b) morphology
(c) physiology
(d) anatomy
Answer: (a) taxonomy
In simple words: Taxonomy is the science of grouping living things based on their similarities and differences. This helps scientists organize and understand the natural world.

🎯 Exam Tip: Taxonomy is about naming, describing, and classifying organisms, forming the basis of biological organization.

 

Question 4. Palmately reticulate, convergent venation is seen in
(a) zizipus
(b) mango
(c) cucurbita
(d) carica papaya
Answer: (a) zizipus
In simple words: In zizipus leaves, the veins spread out like fingers from the base and then come together at the tip. This pattern helps distribute nutrients efficiently.

🎯 Exam Tip: Understand that venation patterns are key features for plant identification. Convergent venation means veins meet at the leaf apex.

 

Question 5. Rolling or folding of individual leaves may be as follows
(a) pteryix
(b) ptyxis
(c) typxis
(d) xyptes
Answer: (b) ptyxis
In simple words: Ptyxis describes how a single leaf is folded or rolled when it is still a bud, before it fully opens. This protected arrangement helps the young leaf develop safely.

🎯 Exam Tip: Differentiate ptyxis (folding of a single leaf in bud) from vernation (arrangement of multiple leaves in a bud).

 

Question 6. The general form of a plant is referred to as ....................
(a) habitat
(b) structure
(c) habit
(d) shape and size
Answer: (c) habit
In simple words: A plant's habit is its overall appearance, including its growth form, shape, and size. This helps categorize plants, like trees, shrubs, or herbs.

🎯 Exam Tip: "Plant habit" is a broad term that describes the typical growth form, which is an important characteristic in botany.

 

Question 7. These are examples for shrubs
(a) coconut and Palmyra
(b) mango and bamboo
(c) hibiscus and castor
(d) cotton and bougainvillea
Answer: (c) Hibiscus and Castor
In simple words: Shrubs are medium-sized woody plants that have multiple stems growing from the ground. Hibiscus and Castor plants fit this description well.

🎯 Exam Tip: Shrubs are distinct from trees (single main trunk) and herbs (non-woody stems), having several woody stems from the base.

 

Question 8. Angiosperms are also known as
(a) Bryophytes
(b) pteridophytes
(c) Magnoliophytes
(d) Tracheophytes
Answer: (c) Magnoliophytes
In simple words: Angiosperms are flowering plants that produce seeds enclosed within a fruit. They are also known as Magnoliophytes, referring to their classification.

🎯 Exam Tip: "Magnoliophytes" is another scientific name for angiosperms, emphasizing their dominant plant group status with flowers and enclosed seeds.

 

Question 9. Climbers are also called as ....................
(a) herbs
(b) trees
(c) vines
(d) shrubs
Answer: (c) vines
In simple words: Climbers are plants that grow upwards by using other objects for support. They are often called vines, like grapevines or morning glories.

🎯 Exam Tip: Recognize that "vines" is a common and interchangeable term for climbing plants.

 

Question 10. The phyllotaxy seen in Nerium is known as
(a) whorled
(b) opposite
(c) alternate
(d) ternate
Answer: (d) Ternate
In simple words: In Nerium, the leaves grow in groups of three at each point on the stem. This specific arrangement is called ternate phyllotaxy, which is a type of whorled arrangement where three leaves appear at one node.

🎯 Exam Tip: Ternate phyllotaxy means three leaves are arranged in a whorl at each node, which is a key characteristic for identification.

 

Question 11. ........................................ is an example for xerophytes.
(a) Lichens
(b) Euphorbia
(c) Ficus
(d) Ipomoea
Answer: (b) Euphorbia
In simple words: Xerophytes are plants that can live in very dry places, like deserts, because they have special ways to store water or reduce water loss. Euphorbia is a good example of such a plant.

🎯 Exam Tip: Identify xerophytes by their adaptations to arid environments, such as thick cuticles, sunken stomata, or succulent stems.

II. Fill Up The Blanks

 

Question 1.

Answer:
a. Heterophylly
b. Ascending
c. Unifoliolate
d. Mosaic
In simple words: Heterophylly means a plant has two different types of leaves. Ascending describes leaves that grow straight up. Unifoliolate leaves have just one leaflet. Mosaic arrangement has leaves of different sizes, with larger ones at the bottom and smaller ones at the top, to catch sunlight efficiently.

🎯 Exam Tip: For fill-in-the-blanks, understand the definition and relate it to the correct botanical term and example. Heterophylly is a common adaptation in aquatic plants.

 

Question 2. ................................. is an example of citrus.
Answer: Orange
In simple words: Citrus plants are known for their juicy, sour fruits. Oranges are a classic example of a citrus fruit.

🎯 Exam Tip: Citrus fruits belong to the genus Citrus and are characterized by their strong aroma and segmented pulp. Always remember common examples like orange or lemon.

III. Identify The Diagram

 

Question 1. Identify The Diagram and Label ABCD
Answer: The diagram shows a Pitcher Plant (Nepenthes). The labeled parts are: A-Pitcher, B-Midrib, C-Leaf Lamina, D-Petiole. The pitcher is a modified leaf that traps insects.
In simple words: This picture shows a Pitcher Plant, which is a special plant that catches insects. The parts are labeled: A is the pitcher, B is the midrib, C is the leaf blade, and D is the leaf stalk.

🎯 Exam Tip: For diagram identification, clearly state the name of the plant or structure, and correctly list all labeled parts. Understand the function of each part shown.

 

Question 2. IDENTIFY THE DIAGRAM and Label ABCD from the diagram
Answer: The diagram shows an Epiphyte - Vanda. The labeled parts are: A-Pulvinus, B-Stipel, C-Rachis, D-Stipule. Vanda is an orchid that grows on other plants.
In simple words: This diagram is of a Vanda orchid, which grows on other plants (an epiphyte). A is the pulvinus, B is the stipel, C is the rachis, and D is the stipule.

🎯 Exam Tip: When identifying epiphytes, note their unique root systems that help them anchor to other plants and absorb moisture from the air.

 

Question 3. ........................................ from the diagram
Answer: The diagram shows a Compound Leaf - Clitoria. The labeled parts are: A-Pulvinus, B-Stipel, C-Rachis, D-Stipule. Clitoria is known for its distinctive compound leaves and butterfly-shaped flowers.
In simple words: This picture shows a compound leaf of the Clitoria plant. The parts are labeled: A (Pulvinus), B (Stipel), C (Rachis), and D (Stipule).

🎯 Exam Tip: Pay close attention to the arrangement of leaflets and the presence of structures like pulvinus and rachis to identify compound leaves.

IV. Read The Following Assertion And Reason Find The Correct Answer

 

Question 1. Assertion: Rootstock lack root cap and root hairs but they possess terminal but which is a characteristic of stem Reason: Rootstocks also known as underground stem
(a) Assertion and Reason are correct reason explaining stem
(b) Assertion and Reason are correct but the reason is not explaining assertion
(c) Assertion is true, but Reason wrong
(d) Assertion is true, but Reason is not explaining assertion
Answer: Assertion and reason are correct -Reason is explaining assertion
In simple words: The assertion says rootstocks don't have root caps or hairs but have a terminal bud, like a stem. The reason says rootstocks are underground stems. Both statements are true, and the reason correctly explains why a rootstock has stem-like features because it is indeed an underground stem.

🎯 Exam Tip: In assertion-reason questions, first check if both statements are true individually. Then, determine if the reason provides a correct explanation for the assertion.

 

Question 2. Assertion: Avicennia develop special kinds of the root (negatively-geotropic) known as respiratory roots Reason: They are mangrove plants
(a) Assertion and Reason are correct Reason is explaining assertion
(b) Assertion and Reason are correct but, the reason is not explaining assertion
(c) Assertion is true, but Reason is wrong
(d) Assertion is true, but Reason is not explaining assertion
Answer: Assertion and reason are correct, but the reason is not explaining assertion.
In simple words: The assertion states that Avicennia has special roots called respiratory roots that grow upwards. The reason states that Avicennia are mangrove plants. Both are true, but being a mangrove plant explains *why* it needs respiratory roots (to breathe in marshy soil), not *that it develops* them. The reason itself doesn't directly explain *how* these roots are formed.

🎯 Exam Tip: Carefully evaluate if the reason *explains* the assertion, or merely provides a related true fact. Here, the reason gives the habitat, which implies the need for such roots, but doesn't explain the developmental aspect mentioned in the assertion.

V. Find Out The Wrong Answer

 

Question 1. Buttress roots are not traced in
(a) Terminalia arjuna
(b) Delonixregia
(c) Bombax spp
(d) Piper betel
Answer: (d) Piper betel
In simple words: Buttress roots are large, flat roots that grow out from the base of a tree to provide extra support, usually seen in big trees. Piper betel (betel pepper) is a climbing plant and does not have buttress roots.

🎯 Exam Tip: Buttress roots are a common adaptation in rainforest trees for structural support. Know which plants typically exhibit this feature and which do not.

 

Question 2. Among the given which one doesn't have foliar roots
(a) Bryophyllum
(b) Begnonia
(c) Zamiaculeas
(d) Ranunculus
Answer: (d) Ranunculus
In simple words: Foliar roots are roots that grow directly from the leaves of a plant, like in Bryophyllum. Ranunculus (buttercup) is a common plant that does not grow roots from its leaves.

🎯 Exam Tip: Foliar roots are a form of vegetative propagation. Remember the key examples like Bryophyllum where these are prominently seen.

 

Question 3. Among the given, Find out the odd man with reference to the fibrous root system.
(a) Eleusineeoracana
(b) Pennisetumamericanum
(c) Ziziphera officinalis
(d) Ficusbenahaliensis
Answer: (d) Ficusbenahaliensis
In simple words: A fibrous root system has many thin roots that spread out like a mat, typical of grasses and monocots. Ficus (a fig tree) usually has a taproot system or aerial roots, making it different from the others listed which have fibrous roots.

🎯 Exam Tip: Differentiate between fibrous root systems (many thin roots, typical of monocots) and taproot systems (one main thick root, typical of dicots) by their structure and common examples.

VI. Form The Match And Find The Wrong Pair

 

Question 1.
(1) Tendril as stem modification – Passiflora
(2) Tendril as leaf modification – Lathyrus
(3) Tendril as stipule modification- Smilax
(4) Tendril as a modification of petiole of the leaf – Nepenthes
Answer: (4) Tendril as a modification of petiole of the leaf – Nepenthes
In simple words: Nepenthes (pitcher plant) modifies its leaf petiole to form the pitcher, not a tendril for climbing. Tendrils are special thread-like structures used by plants to climb.

🎯 Exam Tip: Understand the different plant parts that can be modified into tendrils (stem, leaf, stipule) and their specific examples. Nepenthes uses its petiole for pitcher formation, not as a tendril.

 

Question 2.
(1) Zingifereffienalis – Rhizome
(2) Eolehicum – Form
(3) Allium cepia – Tunicatedbulle
(4) Tuber – Tulipa.spp
Answer: (4) Tuber – Tulipa .spp
In simple words: Tulipa (tulip) forms a bulb, which is a type of underground stem that stores food, but it is not a tuber. Tubers, like potatoes, are swollen underground stems.

🎯 Exam Tip: Distinguish between different types of underground stem modifications for food storage, such as rhizomes (ginger), bulbs (onion, tulip), and tubers (potato).

 

Question 3.
(1) Leaf base – Hypopodium
(2) petiole – Mesopodium
(3) Midrib – Endopodium
(4) Lamenia – Epipodium
Answer: (3) Midrib – Endopodium
In simple words: The midrib is a central vein in the leaf, usually part of the mesopodium (petiole). Endopodium is not a commonly used term for the midrib.

🎯 Exam Tip: Remember the basic parts of a leaf and their botanical terms: hypopodium (leaf base), mesopodium (petiole), and epipodium (lamina or leaf blade).

 

Question 4.
(1) Flattened – Cynodon dactyla
(2) Cylindrical cladode – Asparagus
(3) Flattened phylloclade – Opuntia
(4) Cylindrical – Euphorbia antiquorum
Answer: (3) Flattened phylloclade- Opuntia
In simple words: Opuntia (prickly pear cactus) has flattened stem structures called phylloclades. The term "flattened cladode" might be confused, but phylloclade is the more precise term for Opuntia.

🎯 Exam Tip: Be precise with terms for stem modifications. Phylloclades are flattened, leaf-like stems (Opuntia), while cladodes are cylindrical or flattened stems (Asparagus).

 

Question 5.
(1) Additional outgrowth between leafe base & lamina – Ligute
(2) Sheathing leaf base – Mesopodium
(3) Stiples occur in – Fabaceae
(4) Stiples absent in – Monocots
Answer: (2) Sheathing leaf base – Mesopodium
In simple words: The mesopodium refers to the petiole or leaf stalk, not the sheathing leaf base. The sheathing leaf base is a part of the hypopodium (leaf base) that wraps around the stem.

🎯 Exam Tip: Understand that the leaf base is the bottom-most part, the petiole is the stalk, and the lamina is the blade. Sheathing leaf bases are common in monocots.

 

Question 4.
(1) Flattened – Cynodon dactyla
(2) Cylindrical cladode – Asparagus
(3) Flattened phylloclade – Opuntia
(4) Cylindrical – Euphorbia antiquorum
Answer: (3) Flattened phylloclade- Opuntia
In simple words: This question asks to identify a correct match among different plant modifications. The option (3) correctly states that the flattened phylloclade is a characteristic feature of Opuntia, which is a modified stem that performs photosynthesis.

🎯 Exam Tip: Always remember that phylloclades are modified stems that are flattened and leaf-like to carry out photosynthesis, common in desert plants like Opuntia.

 

Question 5.
(1) Additional outgrowth between leafe base & lamina – Ligute
(2) Sheathing leaf base – Mesopodium
(3) Stiples occur in – Fabaceae
(4) Stiples absent in – Monocots
Answer: (4) Stiples absent in – Monocots
In simple words: This question asks for the correct match among plant features. In monocot plants, stipules, which are small leaf-like parts found at the base of the leaf stalk, are typically not present. This is a key feature used to tell monocots apart from other plant groups.

🎯 Exam Tip: It is important to know the key features of monocots and dicots, especially regarding leaf parts like stipules and venation patterns, as these are common identification points in exams.

 

Part VII. Match and Find the Correct Answer

 

Question 1.
(1) Unipennate – Eaesalpinia A
(2) Bipinnate – Eoriandrumsativum B
(3) Tripinnate – Neem C
(4) Decompound – Moringa D

Answer: (d) C A B D
In simple words: This question asks to match different types of compound leaves with their correct examples. According to the correct option, Unipennate leaves are represented by Neem, Bipinnate by Eaesalpinia, Tripinnate by Eoriandrumsativum, and Decompound by Moringa. Each type shows a unique way a leaf is divided into leaflets.

🎯 Exam Tip: When answering matching questions, always cross-reference each item from the first column with the corresponding item from the second column based on the chosen option. A good understanding of leaf classifications is helpful.

 

Question 6. Tabulate the Aerial Stem modification
Answer:

In simple words: Aerial stem modifications are special changes in plant stems above the ground, helping them adapt for different purposes like spreading or climbing. Creepers spread along the ground, trailers have weak stems that trail without rooting, and climbers use various parts like roots or hooks to grow upwards. Each category has unique plant examples.

🎯 Exam Tip: For tabulation questions, clearly define each category and provide specific, relevant examples. Focus on the main structural differences and functions of each modification.

 

Question 7. Draw the structure of prop roots
Answer:
In simple words: Prop roots are special roots that grow downwards from the branches of large trees, reaching the ground to provide extra support. They act like pillars, helping to anchor the tree and prevent it from falling over.

🎯 Exam Tip: When drawing diagrams, ensure all key parts are clearly labeled and proportionate. For prop roots, emphasize their growth from branches to the ground, indicating their supportive function.

 

Question 8. Differentiate between Excurrent and decurrent types of stem.
Answer:

In simple words: Excurrent stems make trees grow tall and narrow like a cone, with a clear central trunk. Decurrent stems make trees spread out and become rounder, as side branches grow more strongly. These are different ways trees shape themselves.

🎯 Exam Tip: When differentiating, always provide a clear definition or characteristic for each term and then illustrate with specific examples. Visualizing the typical tree shape associated with each type helps solidify your answer.

 

Question 9. Differentiate between Runner and Sucker:
Answer:

In simple words: Runners are stems that grow along the ground, putting down roots at different points to make new plants. Suckers are stems that grow underground and then pop up out of the soil to form new plants. Both are ways plants spread without seeds.

🎯 Exam Tip: Understand that both runners and suckers are forms of vegetative propagation, but they differ in their growth habit (surface vs. underground) and how new plants are formed. Always include specific plant examples for each type.

 

Question 10. Differentiate between Ternate and Whorled Phyilotaxy
Answer:

In simple words: Ternate phyllotaxy means a plant has exactly three leaves growing from one spot on its stem. Whorled phyllotaxy means more than three leaves grow in a circle around one spot on the stem. Both are patterns of how leaves are arranged.

🎯 Exam Tip: Clearly define the number of leaves at each node for both ternate (three) and whorled (more than three) phyllotaxy. Providing specific examples for each type is essential for demonstrating understanding.

 

Question 11. What is plant morphology?
Answer: Plant morphology, also known as external morphology, is the scientific study of the physical form and structure of plants. It involves examining the shapes, sizes, and arrangements of a plant's external parts, such as roots, stems, leaves, flowers, fruits, and seeds. This study helps in understanding plant diversity, classification, and adaptations.
In simple words: Plant morphology is the study of how plants look on the outside. It includes looking at their shape, size, and the structure of all their parts, like leaves and flowers.

🎯 Exam Tip: Define plant morphology as the study of external features. Listing the key plant parts studied (roots, stems, leaves, etc.) demonstrates a complete understanding of the definition.

 

Question 12. Name any 2 brace roots and write down their botanical name
Answer: Brace roots are a type of adventitious root that grows obliquely from the lower nodes of the stem and provides additional support to the plant, especially tall ones.
1. Sugarcane – *Saccharum officinarum*
2. Maize – *Zea mays*
These roots help to anchor the plant firmly in the soil, preventing it from lodging (falling over) in strong winds or due to heavy fruit load.
In simple words: Brace roots are extra roots that grow from the bottom of a plant's stem, like stilts, to give it more support. Two plants that have them are sugarcane and maize.

🎯 Exam Tip: When asked for examples with botanical names, ensure correct spelling and capitalization (genus capitalized, species lowercase, both italicized). Briefly mention the primary function of brace roots.

 

Question 13. Draw the Regions of the root tip and label the parts
Answer:
In simple words: The tip of a root has different sections, each playing a vital role. The root cap protects the tip as it grows through the soil. Above it, the region of cell division makes new cells, which then grow larger in the region of cell maturation. The root hair region has tiny hairs that absorb water and nutrients.

🎯 Exam Tip: Be precise in labeling the distinct zones of the root tip, starting from the root cap at the very end and moving upwards. Understand and briefly state the function of each region.

 

Question 14. What is meant by 'Eye' of a potato?
Answer: An 'eye' of a potato is actually an axillary bud, which is a vegetative bud. This bud is typically covered by a small, scale-like leaf. Each of these eyes on the potato surface has the ability to grow and develop into a new potato plant. This characteristic makes potatoes suitable for vegetative propagation.
In simple words: A potato 'eye' is a small bud on its surface. Each eye can grow into a new potato plant.

🎯 Exam Tip: Explain that an 'eye' is an axillary bud, not just a mark, and highlight its significance in the vegetative propagation of potatoes.

 

Question 15. Draw the structure of a typical leaf and label the parts
Answer:
In simple words: A typical leaf has several main parts: the petiole is the stalk connecting the leaf to the stem, the lamina is the flat, green part (the leaf blade), and the midrib is the central vein running through the lamina. Stipules are small outgrowths usually found at the base of the petiole.

🎯 Exam Tip: Clearly draw and label the petiole, lamina, midrib, and stipules. Ensure the midrib extends from the petiole through the length of the lamina, showing the central axis of the leaf blade.

 

Give Short Answer

 

Question 1. The morphological study is important in Taxonomy. Why?
Answer: Morphological features are very important in taxonomy because they provide visible characteristics for identifying and classifying different organisms. These features are helpful for determining the productivity of crops and understanding the specific habitats where living things thrive. Additionally, studying morphology allows scientists to compare modern plants with fossil plants, which helps to understand plant distribution over time and their evolutionary relationships.
In simple words: Studying how plants look on the outside helps scientists name, group, and understand different plants. It also helps us see how plants have changed over time and where they naturally grow.

🎯 Exam Tip: When explaining the importance of morphology in taxonomy, focus on its roles in identification, classification, habitat determination, and providing insights into evolutionary history and fossil connections.

 

Question 2. Classify leaves on the basis of duration
Answer: Leaves can be classified based on how long they remain on the plant:
1. **Caducous (Fagaceous):** These leaves fall off very quickly, soon after they are formed.
Ex: Opuntia
2. **Deciduous:** These leaves fall off at the end of the growing season, typically during winter or summer, leaving the plant bare.
Ex: *Erythrina indica*
3. **Evergreen:** These leaves stay on the plant throughout the entire year, meaning the tree is never entirely without leaves.
Ex: Mimusops
4. **Marcescent:** These leaves wither and dry up, but they do not fall off the plant. They remain attached, often until new leaves grow in.
Ex: Fagaceae (a plant family, like oak trees)
This classification helps us understand plant adaptations to different climatic conditions.
In simple words: Plants are grouped by how long their leaves stay on. Some leaves fall off quickly, some fall every year, some stay on all year, and some dry up but stick to the plant.

🎯 Exam Tip: Clearly define each category (Caducous, Deciduous, Evergreen, Marcescent) and provide a distinct, well-known example for each. The key differentiating factor is the duration for which leaves are retained on the plant.

 

Question 3. Classify compound leaf types
Answer:

In simple words: Compound leaves are leaves that are divided into smaller, separate leaflets. They are mainly classified into pinnately compound, where leaflets grow along a central stalk like a feather, and palmately compound, where leaflets spread out from a single point like fingers on a palm. Both have further sub-types based on how many times they are divided.

🎯 Exam Tip: When classifying compound leaves, clearly distinguish between pinnate (feather-like arrangement) and palmate (palm-like arrangement). Sub-classify each type based on the number of divisions or leaflets, providing examples for each category.

 

Question 4. Give the diagrammatic representation of leaf modifications
Answer:
In simple words: Leaves can change their form to perform specialized functions beyond just making food. They can become sharp spines for protection, long tendrils for climbing, or even pitcher-like traps to catch insects. These modifications help plants survive and thrive in different environments.

🎯 Exam Tip: When representing leaf modifications diagrammatically, ensure the central theme (leaf modification) is clear and that each type of modification has a distinct label and a correct example plant. This helps to show a comprehensive understanding.

 

Question 5. Give a brief account on the tap root system.
Answer: The tap root system originates directly from the radicle, which is the embryonic root. In dicotyledonous plants, this primary root persists and continues to grow vertically downwards, forming a prominent, thick main root called the tap root. From this central tap root, smaller roots, known as lateral roots, branch out. These lateral roots further subdivide into even finer roots. All the lateral roots, along with their branches, are collectively referred to as secondary roots. This system is effective for anchoring the plant deeply and accessing water from lower soil layers.
In simple words: A tap root system has one main, thick root that grows straight down into the soil. Smaller roots branch off from this main root. This helps the plant stay firm and reach deep water.

🎯 Exam Tip: Key points for explaining the tap root system include its origin from the radicle, the persistence of a dominant primary root, and the hierarchical branching into lateral/secondary roots. Mention its primary functions of anchorage and deep water absorption.

 

Question 6. Classify venation
Answer:

In simple words: Venation is the pattern of veins in a plant leaf. The two main types are reticulate venation, where veins form a net-like network, and parallel venation, where veins run side-by-side. Each of these has further sub-types based on how the veins are organized, which helps in identifying different plant groups.

🎯 Exam Tip: Clearly distinguish between reticulate and parallel venation as the primary classifications. For each, understand the sub-types (pinnate/palmate, divergent/convergent) and provide relevant examples. A simple diagram can also enhance your explanation.

 

Question 7. Notes on Heterophylly.
Answer: Heterophylly describes the condition in plants where a single individual produces two or more different forms of leaves. These differences can be significant in shape, size, and even structure. This phenomenon is an adaptation to varying environmental conditions or developmental stages.
**Types:**
1. **Structural Heterophylly:** This occurs when a plant develops different types of leaves in response to different environmental conditions. For instance, in *Limnophylla heterophylla*, aquatic plants often have submerged leaves that are highly dissected and aerial leaves that are normal, allowing the plant to thrive in both water and air.
2. **Developmental Heterophylly:** This refers to the production of different leaf forms at various stages of a plant's growth. For example, *Sterculia villosa* may have lobed or dissected young leaves, while its mature leaves are entire (undivided). This change is a natural part of the plant's life cycle.
In simple words: Heterophylly means a single plant has different kinds of leaves. This can happen because parts of the plant grow in different places (like in water and air) or because the leaves change shape as the plant gets older.

🎯 Exam Tip: Define heterophylly clearly as the presence of different leaf types on the same plant. Explain both structural and developmental types with distinct examples to illustrate the concept fully.

 

Question 8. How the leaves helps the Bignonia plant?
Answer: In the *Bignonia unguis-cati* plant, commonly known as cat's nail, the leaves are specially modified to help it climb. The terminal leaflets of these leaves transform into three very sharp, stiff, and curved hooks. These hooks strongly resemble a cat's claws. The Bignonia plant uses these specialized hooks to cling onto the bark of trees, walls, or other supporting structures, allowing it to grow upwards and reach sunlight.
In simple words: Bignonia plants have special leaves that turn into sharp, curved hooks. These hooks work like tiny grappling hooks, helping the plant climb up trees and other surfaces for support.

🎯 Exam Tip: When describing leaf modifications, clearly state the specific modification (e.g., hooks), its appearance, and its primary function for the plant (e.g., climbing for support). Providing the botanical name adds precision.

 

Essay Question – Five Marks

 

Question 1. Classify terrestrial habitats
Answer: Terrestrial habitats are various types of land environments where plants live, each characterized by specific conditions like water availability and soil type. They can be classified as follows:

This classification helps understand how different plants adapt to their specific land environments.
In simple words: Terrestrial habitats are different kinds of land environments where plants live. These are grouped by how much water is available: plants that like moderate water, those that live in very dry places, plants that grow in sand, and plants that grow on rocks.

🎯 Exam Tip: When classifying habitats, provide the defining characteristic of each type (e.g., water availability for xerophytes) and include specific plant examples. Ensure botanical names are spelled correctly.

 

Question 2. Classify aquatic habitat.
Answer: Aquatic habitats are water environments where plants live, and they can be classified based on how the plants are positioned relative to the water:

This classification highlights various plant adaptations to different aquatic conditions.
In simple words: Aquatic habitats are water environments where plants live. Plants are grouped based on how they sit in the water: some float freely, some are fully underwater, some stick out of the water, some have leaves that float but roots that are submerged, and some live in salty marshy areas like mangroves.

🎯 Exam Tip: For aquatic habitats, focus on how the plant's parts (roots, leaves, overall body) are positioned relative to the water surface and bottom. Provide specific examples for each type of classification.

 

Question 3. Draw the structure of a typical plant and neatly label the parts
Answer:
In simple words: A typical plant has two main parts: the shoot system, which is above ground and includes the stem, branches, leaves, and flowers; and the root system, which is below ground, featuring a main root and smaller branching roots. These systems work together to help the plant grow and live.

🎯 Exam Tip: When drawing a plant diagram, clearly show both the shoot and root systems. Label all major components like the terminal bud, axillary buds, branches, flowers, and the different levels of roots (primary, secondary, tertiary) for a complete answer.

 

Question 4. What are the various types of root modification
Answer:

In simple words: Roots can change their form to do different jobs for the plant. These changes, called modifications, allow roots to store food, breathe air in wet soil, provide extra support, or even perform vital functions like photosynthesis. These adaptations help plants survive in various environments.

🎯 Exam Tip: When classifying root modifications, clearly differentiate between tap root and adventitious root modifications. For each type, list specific examples and their primary function. A well-organized table helps to present a comprehensive answer.

 

Question 5. Give a clear-cut distinction of Horks, Spines & Prickles.
Answer:

In simple words: Horks are like small, curved hooks that come from leaves and help a plant climb. Spines are sharp, pointy leaves or parts of leaves that protect the plant, especially in dry places. Prickles are sharp bumps that grow from the outer skin of stems or leaves, also for protection, but they are not modified leaves.

🎯 Exam Tip: Differentiate these structures based on their origin (e.g., leaf modification vs. epidermal outgrowth) and their primary function (climbing vs. protection). Providing specific plant examples is crucial for a complete answer.

 

Question 6. List out various types of Phyllotaxy.
Answer: Ptyxis, also known as vernation, refers to the way a single leaf is folded or rolled within the bud before it unfurls. This arrangement protects the delicate young leaf. Here are some types:

In simple words: Phyllotaxy is the pattern of how leaves are arranged on a plant stem. Different plants show various patterns, such as single leaves in a spiral, two leaves opposite each other, three leaves in a circle, or more than three in a whorl. These patterns help each leaf get enough sunlight.

🎯 Exam Tip: For each type of phyllotaxy, clearly state the number of leaves per node and their specific arrangement. Providing a distinct example for each type is crucial to demonstrate comprehensive knowledge.

 

Question 7. Compare & Contrast pitcher from bladderwort.
Answer:

In simple words: Pitcher plants are land plants that catch insects using a leaf shaped like a deep cup. Bladderworts are water plants that have small, air-filled sacs on their leaves to trap tiny water creatures. Both are carnivorous plants that get extra nutrients from consuming small prey.

🎯 Exam Tip: When comparing, highlight differences in habitat (terrestrial vs. aquatic), the specific plant part modified (leaf lamina vs. leaf segments), and the unique trapping mechanism of each. Remember both are carnivorous due to nutrient-poor environments.

 

Question 8. Define Ptyxis or Vernation list out the various types
Answer: Ptyxis, also known as vernation, refers to the precise way a single leaf is folded or rolled within its bud before it completely unfurls. This arrangement protects the delicate young leaf from damage during its development. Here are some common types:

In simple words: Ptyxis, or vernation, is how a young leaf is folded or rolled up inside a bud before it opens. There are various ways leaves do this, such as folding in half, rolling from the tip, or being crinkled, each helping to keep the new leaf safe as it grows.

🎯 Exam Tip: Define ptyxis clearly as the folding or rolling of a single leaf within a bud. For each type, accurately describe the specific folding pattern and provide a clear example plant. Visualizing these patterns can significantly help in recall.

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