NEET Biology Plant Growth and Development MCQs Set 17

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: Phytochrome is a :-
(a) Lipoprotein
(b) Chromoprotein
(c) Flavoprotein
(d) Glycoprotein
Show Answer & Explanation

Answer: (b) Chromoprotein

Explanation:
1. Phytochrome is a chromoprotein.

Teacher's Note:
1. It has a protein part and a chromophore.

Question 2: Which one of the following pairs, is not correctly matched ?
(a) IAA - Cell wall elongation
(b) Abscisic acid – Stomatal closure
(c) Gibberellic acid – Leaf fall
(d) Cytokinin – Cell division
Show Answer & Explanation

Answer: (c) Gibberellic acid – Leaf fall

Explanation:
1. Gibberellic acid promotes growth and does not cause leaf fall; ABA and ethylene do.

Teacher's Note:
1. The other pairs are correct.

Question 3: Cell elogation in internodel regions of the green plants takes place due to :-
(a) Ethylene
(b) Indole acetic acid
(c) Cytokinin
(d) Gibberellins
Show Answer & Explanation

Answer: (d) Gibberellins

Explanation:
1. Gibberellins cause elongation of internodes.

Teacher's Note:
1. They affect genetically dwarf plants.

Question 4: In germinating seeds Amylase, Proteases,Lipases are stimulated by :-
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Ethylene
Show Answer & Explanation

Answer: (b) Gibberellin

Explanation:
1. Gibberellin induces synthesis of amylase, proteases and lipases in germinating seeds.

Teacher's Note:
1. Aleurone layer responds to GA.

Question 5: Which pigment absorbs the red and far–red light?
(a) Cytochrome
(b) Phytochrome
(c) Carotenoids
(d) Chlorophyll
Show Answer & Explanation

Answer: (b) Phytochrome

Explanation:
1. Phytochrome absorbs red (660 nm) and far-red (730 nm) light.

Teacher's Note:
1. Chlorophyll absorbs red and blue but is not a photoreceptor for photoperiod.

Question 6: Which of the following is growth inhibitor -
(a) IAA
(b) ABA
(c) NAA
(d) GA3
Show Answer & Explanation

Answer: (b) ABA

Explanation:
1. Abscisic acid is a growth inhibitor.

Teacher's Note:
1. IAA, NAA and GA3 are growth promoters.

Question 7: (i) Promote nutrient mobilisation (ii) Overcome the apical dominance (iii) Lateral shoot growth All the above physiological effects are related to which of the following plant growth regulators?
(a) Auxins
(b) Gibberellins
(c) Abscisic acid
(d) Cytokinins
Show Answer & Explanation

Answer: (d) Cytokinins

Explanation:
1. Cytokinins promote nutrient mobilisation, overcome apical dominance and promote lateral shoot growth.

Teacher's Note:
1. They also delay senescence.

Question 8: If the given concentrations of BAP are 0.5 μM, 5 μM and 50 μM, the amounts of BAP (in ppm) for shoot induction at these concentrations are respectively (molecular weight of BAP = 225)
(a) 0.5, 5.0, 50
(b) 0.1, 1.0, 11
(c) 10, 100, 1000
(d) 50, 500, 5000
Show Answer & Explanation

Answer: (b) 0.1, 1.0, 11

Explanation:
1. 0.5 μM x 225 g/mol = 112.5 μg/L, so 0.1 ppm roughly; 5 μM gives 1.1 ppm and 50 μM gives 11 ppm.

Teacher's Note:
1. 1 ppm = 1 mg per litre.

Question 9: Auxin can be bioassayed by :
(a) Lettuce hypocotyl elongation
(b) Avena coleoptile curvature
(c) Hydroponics
(d) Potometer
Show Answer & Explanation

Answer: (b) Avena coleoptile curvature

Explanation:
1. The Avena coleoptile curvature test is the bioassay for auxin.

Teacher's Note:
1. Lettuce hypocotyl test is used for gibberellins.

Question 10: Which of the following is not a natural occuring plant hormone ?
(a) 2, 4 - D
(b) GA2
(c) Gibberellin
(d) I.A.A
Show Answer & Explanation

Answer: (a) 2, 4 - D

Explanation:
1. 2,4-D is a synthetic auxin, whereas IAA and gibberellins occur naturally.

Teacher's Note:
1. NAA, IBA (in some cases) and 2,4-D are synthetic auxins.

Question 11: Agent orange is-
(a) Biodegradable insecticide
(b) Dioxin weedicide (2,4-D + 2,4,5-T)
(c) Biofertilizer
(d) Biopesticide
Show Answer & Explanation

Answer: (b) Dioxin weedicide (2,4-D + 2,4,5-T)

Explanation:
1. Agent orange is a defoliant mixture of 2,4-D and 2,4,5-T containing dioxin.

Teacher's Note:
1. It was used in the Vietnam war.

Question 12: Which one of the following generally acts as an antagonist to gibberellins ?
(a) ABA
(b) IAA
(c) Zeatin
(d) Ethylene
Show Answer & Explanation

Answer: (a) ABA

Explanation:
1. ABA acts as an antagonist of gibberellins in dormancy and germination.

Teacher's Note:
1. GA breaks dormancy and ABA maintains it.

Question 13: In tissue culture, differentiation of shoot is controlled by :-
(a) Light Intensity
(b) Temperature shock
(c) Low Auxin to high CK
(d) High auxin to low CK
Show Answer & Explanation

Answer: (c) Low Auxin to high CK

Explanation:
1. A high cytokinin to auxin ratio promotes shoot formation in callus; a high auxin ratio gives roots.

Teacher's Note:
1. Skoog and Miller showed this.

Question 14:
Assertion (A): Development is a broad and extensive aspect of the life of an organism.
Reason (R): Development includes all changes that an organism goes through during it's life cycle from birth of death.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Development is broad and covers all changes in the life cycle from birth to death.

Teacher's Note:
1. Growth and differentiation are parts of it.

Question 15: Which plant is LDP ?
(a) Tobacco
(b) Glycine max.
(c) Xanthium
(d) Spinach
Show Answer & Explanation

Answer: (d) Spinach

Explanation:
1. Spinach is a long day plant; soybean (Glycine max) and Xanthium are short day plants.

Teacher's Note:
1. Tobacco varieties are mostly short day.

Question 16: Pine apple can made to flower in off season by the application :-
(a) Zeatin
(b) Ethylene
(c) Short day
(d) Low temperature
Show Answer & Explanation

Answer: (b) Ethylene

Explanation:
1. Ethylene (or ethephon) induces flowering in pineapple out of season.

Teacher's Note:
1. It also synchronises fruit set.

Question 17: Auxanometer is meant for measuring -
(a) Respiratory activity
(b) Photosynthetic activity
(c) Growth activity
(d) Osmotic pressure
Show Answer & Explanation

Answer: (c) Growth activity

Explanation:
1. The auxanometer measures growth, i.e. increase in length of a plant part.

Teacher's Note:
1. The potometer measures transpiration.

Question 18: Natural cell division inducing factor occurs in -
(a) Coconut milk
(b) Immature maize seeds
(c) Both (1) and (2)
(d) Heated t - RNA
Show Answer & Explanation

Answer: (c) Both (1) and (2)

Explanation:
1. Coconut milk and immature maize seeds both contain cytokinin (zeatin).

Teacher's Note:
1. Zeatin was isolated from maize.

Question 19:
Assertion (A): Auxins help to prevent fruit and leaf drop at early stages.
Reason (R): In early stages auxins do not allow differentiation of abscission zone at the base of plant organs.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Auxins prevent early fruit and leaf drop because they stop formation of the abscission zone.

Teacher's Note:
1. The reason explains the assertion.

Question 20: 2, 4-D does not affect :-
(a) Mature monocotyledons
(b) Mature dicotyledons
(c) Both
(d) None
Show Answer & Explanation

Answer: (a) Mature monocotyledons

Explanation:
1. 2,4-D kills dicot weeds but does not harm mature monocots.

Teacher's Note:
1. It is a selective weedicide.

Question 21: Which statement is not correct about ethylene ?
(a) Synthesized in large amount by tissues undergoing senescence.
(b) Enhances respiration rate during ripening of the fruits
(c) Break down dormany in peanut seeds
(d) Promotes male flower in cucumber
Show Answer & Explanation

Answer: (d) Promotes male flower in cucumber

Explanation:
1. Ethylene promotes female flowers in cucumber, not male flowers.

Teacher's Note:
1. The other statements are right.

Question 22: One set of a plant was grown at 12 hrs. 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 flower. Under which one of the following categories will you place this plant
(a) Short day
(b) Long day
(c) Darkness neutral
(d) Day neutral
Show Answer & Explanation

Answer: (a) Short day

Explanation:
1. Flowering needs a continuous long night, and a light flash in the night prevented it, so the plant is a short day plant.

Teacher's Note:
1. The dark period is critical for SDPs.

Question 23: Auxin inhibits the growth of -
(a) Apical bud
(b) Lateral axillary buds
(c) Roots on stem cutting
(d) Parthenocarpic development of fruits
Show Answer & Explanation

Answer: (b) Lateral axillary buds

Explanation:
1. Auxin made in the apical bud inhibits the growth of lateral axillary buds.

Teacher's Note:
1. Auxin promotes rooting on cuttings and parthenocarpy.

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Plant Growth and Development Objective Questions & Solutions for NEET Biology

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

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