NEET Biology Plant Growth and Development MCQs Set 09

Multiple Choice Questions (MCQs) for NEET Biology: Plant Growth and Development

Access targeted multiple-choice questions for Plant Growth and Development designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

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Multiple Choice Questions

Question 1: Dr.F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly - cut coleoptile stumps. Of what significance is this experiment?
(a) It made possible the isolation and exact identification of auxin
(b) It is the basis for quantitative determination of small amounts of growth-promoting substances
(c) It supports the hypothesis that IAA is auxin
(d) It demonstrated polar movement of auxins
Show Answer & Explanation

Answer: (b) It is the basis for quantitative determination of small amounts of growth-promoting substances

Explanation:
1. Growth Auxin  Growth Auxin .

Question 2: During seed germination its stored food is mobilized by
(a) Cytokinin
(b) ABA
(c) Gibberellin
(d) Ethylene
Show Answer & Explanation

Answer: (c) Gibberellin

Explanation:
1. GA Embryo   Aleurone layer   - Amylase, Proteases  Seed germinates  ATP  Sugar  Starchy endosperm.

Question 3: Through their effect on plant growth regulators, what do the temperature and light control in the plants?
(a) Apical dominance
(b) Flowering
(c) Closure of stomata
(d) Fruit elongation
Show Answer & Explanation

Answer: (b) Flowering

Explanation:
1. In the presence of light, florigen migrates from shoot to buds for inducing flowers.

Question 4: Photoperiodism was first characterised in
(a) Cotton
(b) Tobacco
(c) Potato
(d) Tomato
Show Answer & Explanation

Answer: (b) Tobacco

Explanation:
1. By Garner and Allard  Found that they can flower only if plants were exposed to number of short days.

Question 5: Phototropic curvature is the result of uneven distribution of
(a) Auxin
(b) Gibberellin
(c) Phytochrome
(d) Cytokinins
Show Answer & Explanation

Answer: (a) Auxin

Explanation:
1. Auxin move from illuminated site to dark site.

Question 6: One of the commonly used plant growth hormone is tea plantations is
(a) Ethylene
(b) Abscisic acid
(c) Zeatin
(d) Indole-3-acetic acid
Show Answer & Explanation

Answer: (c) Zeatin

Explanation:
1. This option, Zeatin, is the one that agrees with the standard NCERT facts for this topic.

Question 7: One of the synthetic auxin is
(a) IAA
(b) GA
(c) IBA
(d) NAA
Show Answer & Explanation

Answer: (d) NAA

Explanation:
1. This option, NAA, is the one that agrees with the standard NCERT facts for this topic.

Question 8: Which one of the following acids is a derivative of carotenoids?
(a) Indole-3-acetic acid
(b) Gibberellic acid
(c) Abscisic acid
(d) Indole butyric acid
Show Answer & Explanation

Answer: (c) Abscisic acid

Explanation:
1. Abscisic acid acts as derivative of carotenoids.

Question 9: Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in
(a) Floral parts
(b) Vessels and tracheid differentiation
(c) Leaf abscission
(d) Annual plants
Show Answer & Explanation

Answer: (c) Leaf abscission

Explanation:
1. Ageing  Shedding.

Question 10: Importance of day length in flowering of plants was first shown in
(a) Petunia
(b) Lemna
(c) Tobacco
(d) Cotton
Show Answer & Explanation

Answer: (c) Tobacco

Explanation:
1. Photoperiodism observed in tobacco by Garner and Allard.

Question 11: “Foolish Seedling” disease of rice led to the discovery of
(a) IAA
(b) GA
(c) ABA
(d) 2, 4 – D
Show Answer & Explanation

Answer: (b) GA

Explanation:
1. First this hormone was discovered in rice seedling, in which some plants were tall and some were dwarf, due to fungi Gibberella fujikuroi and called this disease "Bakane" (foolish seedling disease).

Question 12: Opening of floral buds into flowers, is type of:
(a) Autonomic movement of growth
(b) Autonomic movement of locomotion
(c) Autonomic movement of variation
(d) Paratonic movement of growth
Show Answer & Explanation

Answer: (a) Autonomic movement of growth

Explanation:
1. Autonomic movement of growth  A Plant movement that results from internal growth changes and is independent of changes in external environment.

Question 13: The wavelength of light absorbed by Pr form of phytochrome is
(a) 660 nm
(b) 720 nm
(c) 620 nm
(d) 640 nm
Show Answer & Explanation

Answer: (a) 660 nm

Explanation:
1. 660 nm Pr Pfr 730 nm.

Question 14: Treatment of seed at low temperature under moist conditions to break its dormancy is called :
(a) Scarification
(b) Vernalization
(c) Chelation
(d) Stratification
Show Answer & Explanation

Answer: (d) Stratification

Explanation:
1. Low temperature treatment of seed for germination is called stratification.

Question 15: An enzyme that can stimulate germination of barley seeds is
(a) -amylase
(b) Lipase
(c) Protease
(d) Invertase
Show Answer & Explanation

Answer: (a) -amylase

Explanation:
1. This option, -amylase, is the one that agrees with the standard NCERT facts for this topic.

Question 16: Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
(a) Application of iron and magnesium to promote synthesis of chlorophyll
(b) Frequent irrigation of the crop
(c) Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer
(d) Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid
Show Answer & Explanation

Answer: (c) Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer

Explanation:
1. Cytokinin will delay senescence, promotes cell division and fertilizers will make the soil fertile.

Question 17: The ability of the venus flytrap to capture insects is due to :
(a) Chemical stimulation by the prey
(b) A passive process requiring no special ability on the part of the plant
(c) Specialized “muscle-like” cells
(d) Rapid turgor pressure changes
Show Answer & Explanation

Answer: (d) Rapid turgor pressure changes

Explanation:
1. This option, Rapid turgor pressure changes, is the one that agrees with the standard NCERT facts for this topic.

Question 18: The pineapple which under natural conditions is difficult to blossom has been made to produce fruits throughout the year by application of
(a) IAA, IBA
(b) NAA, 2, 4-D
(c) Phenyl acetic acid
(d) Cytokinin
Show Answer & Explanation

Answer: (b) NAA, 2, 4-D

Explanation:
1. Auxin induces flowering in pineapple and litchi.

Question 19: If the growing plant is decapitated, then
(a) Its growth stops
(b) Leaves become yellow and fall down
(c) Axillary buds are inactivated
(d) Axillary buds are activated
Show Answer & Explanation

Answer: (d) Axillary buds are activated

Explanation:
1. This is so because due to presence of auxin at tip axillary bud are unable to develop into leaves, i.e., apical dominance but if we remove tip then they can develop.

Question 20: The movement of auxin is largely
(a) Centripetal
(b) Basipetal
(c) Acropetal
(d) Both (1) & (3)
Show Answer & Explanation

Answer: (b) Basipetal

Explanation:
1. From tip to base.

Question 21: 2, 4-D is an effective
(a) Rodenticide
(b) Wormicide
(c) Fungicide
(d) Weedicide
Show Answer & Explanation

Answer: (d) Weedicide

Explanation:
1. 2, 4-D is an auxin used to remove unwanted plants with crops.

Question 22: Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone
(a) Auxin
(b) Cytokinin
(c) Ethylene
(d) Abscissic acid
Show Answer & Explanation

Answer: (a) Auxin

Explanation:
1. Precursor : Tryptophan require Zn2+ for its synthesis.

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About Plant Growth and Development MCQs for NEET Biology

Test your conceptual understanding of Plant Growth and Development with these targeted multiple-choice questions. Designed in alignment with the latest NEET curriculum for NEET Biology, these problem sets build accuracy and prepare students for objective exams.

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