NEET Biology Plant Growth and Development MCQs Set 10

Download NEET MCQs for NEET Biology: Plant Growth and Development

Review structured MCQ sets for NEET Biology Plant Growth and Development. Built according to official NEET guidelines, these downloadable questions support daily revision and core concept reinforcement.

Chapter-wise Objective Questions: Plant Growth and Development

Access the complete set of multiple-choice questions for Plant Growth and Development below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official NEET textbooks.

Multiple Choice Questions

Question 1: Gibberellic acid induces flower
(a) In short day plants under long day conditions
(b) In day-neutral plants under dark conditions
(c) In some gymnospermic plants only
(d) In long day plants under short day conditions
Show Answer & Explanation

Answer: (d) In long day plants under short day conditions

Explanation:
1. GB Florigen Anthesin Under short day condition GB will be deficient but anthesin is sufficient, so if we provide GB then it induces flower.

Question 2: Which breaks dormancy of potato tuber?
(a) Gibberellin
(b) IAA
(c) ABA
(d) Zeatin
Show Answer & Explanation

Answer: (a) Gibberellin

Explanation:
1. Gibberellin breaks the dormancy and promote germination.

Question 3: Differentiation of shoot is controlled by
(a) High auxin : cytokinin ratio
(b) High cytokinin : auxin ratio
(c) High gibberellin : auxin ratio
(d) High gibberellin : cytokinin ratio
Show Answer & Explanation

Answer: (b) High cytokinin : auxin ratio

Explanation:
1. Auxin  1   Root Cytokinin CY  1   Shoot Auxin.

Question 4: Coconut milk factor is
(a) Auxin
(b) A Gibberellin
(c) Abscissic acid
(d) Cytokinin
Show Answer & Explanation

Answer: (d) Cytokinin

Explanation:
1. Coconut milk also has cytokinin.

Question 5: Which hormone is responsible for fruit ripening?
(a) Ethylene
(b) Auxin
(c) Ethyl chloride
(d) Cytokinin
Show Answer & Explanation

Answer: (a) Ethylene

Explanation:
1. Ethylene is fruit ripening hormone.

Question 6: ABA is involved in
(a) Shoot elongation
(b) Increased cell division
(c) Dormancy of seeds
(d) Root elongation
Show Answer & Explanation

Answer: (c) Dormancy of seeds

Explanation:
1. ABA is growth inhibitor.

Question 7: By which action a seed coat becomes permeable to water?
(a) Scarification
(b) Stratification
(c) Vernalization
(d) All of these
Show Answer & Explanation

Answer: (a) Scarification

Explanation:
1. Removal of seed coat or weakening of seed coat is called scarification.

Question 8: The response of different organisms to the environmental rhythms of light and darkness is called
(a) Vernalization
(b) Photoperiodism
(c) Phototaxis
(d) Phototropism
Show Answer & Explanation

Answer: (b) Photoperiodism

Explanation:
1. The effect of light duration for flowering is known as photoperiodism.

Question 9: Which plant is LDP?
(a) Tobacco
(b) Glycine max
(c) Mirabilis jalapa
(d) Spinach
Show Answer & Explanation

Answer: (d) Spinach

Explanation:
1. Spinach is long day plants.

Question 10: One set of the plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place other set of plant?
(a) Long day
(b) Darkness neutral
(c) Day neutral
(d) Short day
Show Answer & Explanation

Answer: (d) Short day

Explanation:
1. Short day plant are actually long night plant, when night phase was interrupted by flash of light, it did not produce flower.

Question 11: Phytochrome becomes active in
(a) Red light
(b) Green light
(c) Blue light
(d) None of these
Show Answer & Explanation

Answer: (a) Red light

Explanation:
1. Red light Pr Pfr.

Question 12: The twinning of tendrils around a support is a good example of
(a) Phototropism
(b) Chemotropism
(c) Nastic movements
(d) Thigmotropism
Show Answer & Explanation

Answer: (d) Thigmotropism

Explanation:
1. It is growth with respect to touch, enables roots to grow around obstacles and is responsible for ability of shoots of climbing plants to wrap around other structures for support.

Question 13: The closing and opening of the leaves of Mimosa pudica is due to
(a) Seismonastic movement
(b) Chemonastic movement
(c) Thermonastic movement
(d) Hydrotropic movement
Show Answer & Explanation

Answer: (a) Seismonastic movement

Explanation:
1. Seismonastic movement Diffused movement Response to non-directional shock stimulus; e.g., when lightly struck / shaken.

Question 14: Assertion (A): Only bud, or embryo can be vernalized.
Reason (R): Vernalization requires dividing cells.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

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

Explanation:
1. Bud, embryo has dividing cells.

Question 15: Assertion (A): Phytochrome, a protein, has regulatory function.
Reason (R): Various morphogenetic processes are regulated by it.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

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

Explanation:
1. Phytochrome is a protein, regulates.
2. Flowering in short day and long day plants.

Question 16: Assertion (A): Auxins treatment cause acidification of cellwall and help in cell elongation.
Reason (R): Loosening of cell wall microfibrils occurs.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

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

Explanation:
1. Auxin makes Cell wall Acidic Elongation of cell Enzyme (Epansin) New cell material diluted (low pH) Looser up Cellulose breaks H-bonds network.

Question 17: Assertion (A): Cytokinins are anti ageing hormones.
Reason (R): They cause changes in osmotic potential by increasing the volume of mature cells.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

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

Explanation:
1. Cytokinins delay the senescence i.e., antiageing hormone and increase the mobilisation of elements.

Question 18: Assertion (A): Gibberellic acid increases the yield of malt from barley grain.
Reason (R): Gibberellins stimulate the synthesis of amylase, protease and other hydrolytic enzymes for mobilisation of reserve food.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

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

Explanation:
1. (Malt) Embryo GA Aleurone layer Beer Maltose Enzyms Hydrolytic enzymes Starchy endosperm ( - amylase) Seed germination ATP Sugar.

Question 19: Assertion (A): 2, 4-D is widely used by farmers in agricultural and horticultural practices.
Reason (R): Flowering in most plants can be initiated by using high concentration of Auxin.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. 2, 4D  to remove weeds.
2. Florigen  flowers.

Question 20: Assertion (A): Cytokinin along with the auxin are required for morphogenesis.
Reason (R): More cytokinin to auxin ratio promote root initiation during micropropagation.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. Cytokin ratio promotes shots and roots.
2. Auxin Cytokin Auxin  1  Shoot,  1  Root Auxin Cytokin.

Question 21: Assertion (A): Seeds do not sprout when ABA is overcome by Gibberellins.
Reason (R): GA inhibits protein and RNA synthesis.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (d) Both Assertion and Reason are false.

Explanation:
1. Seeds/buds sprout only when ABA is overcome by gibberellins.
2. ABA inhibits protein and RNA synthesis.

Question 22: Assertion (A): Soyabean and sugarbeet flower when they are exposed to a photoperiod shorter than critical period.
Reason (R): Most of winter flowering plants are LDP.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (d) Both Assertion and Reason are false.

Explanation:
1. Soyabean  Short day plant.
2. Sugerbeet – Long day plant.
3. Winter flowers – SDP.

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Practice MCQs for NEET Biology Plant Growth and Development

About Plant Growth and Development MCQs for NEET Biology

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