NEET Biology Morphology of Flowering Plants MCQs Set 23

Answer: (d) all of these

Explanation:
1. Desert plants have well developed root system so that they can absorb water from the deeper layers of soil.
2. They have sunken stomata and reduced leaves which reduce the rate of water loss through transpiration.
3. Hence option (d) is correct: all of these

Teacher's Note:
1. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.
2. Compare monocot and dicot features side by side to avoid confusion.

Answer: (b) persistant nucellus

Explanation:
1. The nucellus is generally used up during the development of embryo but in some cases it remains outside the endosperm in the form of a thin layer, called perisperm.
2. Hence option (b) is correct: persistant nucellus

Teacher's Note:
1. Compare monocot and dicot features side by side to avoid confusion.
2. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.

Answer: (b) 2

Explanation:
1. In a moss capsule the peristome is a ring of 32 teeth arranged in two whorls, an outer and an inner one.
2. The teeth are hygroscopic and help in spore dispersal.
3. Hence option (b) is correct: 2

Teacher's Note:
1. In moss, peristome consists of 32 acellular teeth arranged in 2 whorls, outer hygroscopic and inner hygroscopic.
2. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.

Answer: (a) glossopodium

Explanation:
1. Glossopodium is a mature ligule.
2. It is generally present in grasses.
3. Hence option (a) is correct: glossopodium

Teacher's Note:
1. The ligule is an outgrowth between leaf base and lamina.
2. Leaves with ligule are called ligulates.

Answer: (a) inflorescence

Explanation:
1. Cauliflower is a crossbreed between 2 varieties of cabbage.
2. It is evident that the edible part is the inflorescence due to the presence of small florets.
3. Hence option (a) is correct: inflorescence

Teacher's Note:
1. Compare monocot and dicot features side by side to avoid confusion.
2. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.

Answer: (a) flower bud

Explanation:
1. The structure of clove itself resembles the bud where we are, infact, able to see the calyx also.
2. Clove that is used as a condiment and spice has more of the medicinal property at the bud stage.
3. Hence option (a) is correct: flower bud

Teacher's Note:
1. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.
2. Compare monocot and dicot features side by side to avoid confusion.

Answer: (b) gram

Explanation:
1. Grams are leguminous plants.
2. Nitrogen fixing bacteria is seen in leguminous plants.
3. Hence option (b) is correct: gram

Teacher's Note:
1. They convert atmospheric N₂ to nitrate that can easily be absorbed by plants.
2. Compare monocot and dicot features side by side to avoid confusion.

Answer: (b) Papilionaceae

Explanation:
1. In papilionaceae- the androceium is seen in diadelphous condition. 10 stamens are seen in two bundles- 9 + 1. 9 together form one bundle whereas the single stamen forms another bundle.
2. Hence option (b) is correct: Papilionaceae

Teacher's Note:
1. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.
2. Compare monocot and dicot features side by side to avoid confusion.

Answer: (a) Monothecous

Explanation:
1. The filament of stamen bears one celled anther.
2. Hence option (a) is correct: Monothecous

Teacher's Note:
1. Compare monocot and dicot features side by side to avoid confusion.
2. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.

Answer: (a) Brassicaceae - Tetramerous flowers, six stamens, bicarpellary gynoecium, siliqua type fruit

Explanation:
1. Mustard belongs to Brassicaceae (Cruciferae).
2. Its flowers are tetramerous with 4 sepals, 4 petals, six stamens (tetradynamous, 2 + 4) and a bicarpellary ovary, and the fruit is a siliqua.
3. Hence option (a) is correct: Brassicaceae - Tetramerous flowers, six stamens, bicarpellary gynoecium, siliqua type fruit

Teacher's Note:
1. Brassicaceae (cruciferae) Other members are : Raddish, cabbage, cauliflower.
2. Floral formula : Ebr, , K2 + 2, C4 A2 + 4, G(2).

Answer: (c) absorption of moisture from air

Explanation:
1. Orchids are the epiphytes that posses aerial roots.
2. These roots contain a spongy tissue called velamen whose main function is to absorb moisture from the air.
3. Hence option (c) is correct: absorption of moisture from air

Teacher's Note:
1. Compare monocot and dicot features side by side to avoid confusion.
2. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.

Answer: (b) inflorescence

Explanation:
1. Composite fruits develop from the complete inflorescence and are also known as multiple fruit.
2. These are of 2 types- sorosis and syconus.
3. Hence option (b) is correct: inflorescence

Teacher's Note:
1. Sorosis develops from spike, spadix or catkin inflorescence, e.g.
2. Ananas, Arto carpus.

Answer: (d) Asteraceae

Explanation:
1. This condition is called syngenesious.
2. It is found in members of family asteraceae (or compositae), e.g., disc florets of sunflower.
3. Hence option (d) is correct: Asteraceae

Teacher's Note:
1. Compare monocot and dicot features side by side to avoid confusion.
2. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.

Answer: (d) multicarpellary, apocarpous ovary

Explanation:
1. A muticarpellary ovary may be syncarpous (when carpels are fused) or apocarpous (when the carpels are free).
2. A syncarpous ovary gives rise to a simple fruit while in an apocarpous ovary, each carpel changes into a fruitlet.
3. Hence option (d) is correct: multicarpellary, apocarpous ovary

Teacher's Note:
1. The collection or aggregate of these fruitlets is known as etaerio.
2. Compare monocot and dicot features side by side to avoid confusion.

Answer: (c) Exogenous in origin

Explanation:
1. Prickles of rose develop only from cortex and epidermis and found at the nodes or internodes.
2. It helps in climbing.
3. Hence option (c) is correct: Exogenous in origin

Teacher's Note:
1. It is exogenous in origin.
2. Compare monocot and dicot features side by side to avoid confusion.

Answer: (a) Onion – Bulb

Explanation:
1. Onion - Bulb - Undeground stem , Ginger - Rhizome, Chlamydomonas - Zoospore, Yeast - Ascospores.
2. Hence option (a) is correct: Onion – Bulb

Teacher's Note:
1. Compare monocot and dicot features side by side to avoid confusion.
2. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.

Answer: (b) Perigyny

Explanation:
1. In perigyny the gynoecium lies in the centre and the other floral parts are on the rim of the thalamus at about the same level.
2. The ovary is half-inferior.
3. Plum, rose and peach show this condition.
4. Hence option (b) is correct: Perigyny

Teacher's Note:
1. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.
2. Compare monocot and dicot features side by side to avoid confusion.

Answer: (d) All of these

Explanation:
1. Seeds perform all the given functions.
2. Hence option (d) is correct: All of these

Teacher's Note:
1. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.
2. Compare monocot and dicot features side by side to avoid confusion.

Answer: (b) A – IV; B – I; C – V; D – III

Explanation:
1. Coleorhiza is the protective covering of the radicle (IV).
2. Apogamy is development of a sporophyte directly from a gametophyte without gametes (I).
3. Indusium is the protective covering of a sorus (V).
4. Caudex is an unbranched columnar stem with a crown of leaves (III).
5. Hence option (b) is correct: A – IV; B – I; C – V; D – III

Teacher's Note:
1. Compare monocot and dicot features side by side to avoid confusion.
2. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.

Answer: (b) Thorns

Explanation:
1. Thorn is a stiff, sharp-pointed woody projection on the stem or other part of a plant.
2. Thorns are found in many plants such as Citrus, Bougainvillea.
3. Hence option (b) is correct: Thorns

Teacher's Note:
1. They protect plants from grazing animals.
2. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.

Answer: (a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.

Explanation:
1. The root apex is covered by a root cap, so the meristem lies a little behind the tip, that is, it is subterminal.
2. The root cap at the terminal end is the reason for this position.
3. Hence option (a) is correct: Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.

Teacher's Note:
1. Morphology questions repeat: learn the example plant for each modification, inflorescence and family.
2. Compare monocot and dicot features side by side to avoid confusion.

Answer: (b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.

Explanation:
1. A simple leaf has an undivided lamina (possibly with incisions not reaching the midrib).
2. Incisions occur in leaves with pinnate or palmate venation, but they do not explain the definition of a simple leaf.
3. Hence option (b) is correct: Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.

Teacher's Note:
1. A leaf having a single or undivided lamina is called simple leaf, the lamina can have different types of incisions, which may reach upto half, more than half or near the base or midrib.
2. Depending upon the pinnate or palmate venation, the incisions are known as pinnatifid, palmatifid, pinnatipartite, palmatipartite, pinnatisect and palmatisect, etc.