NEET Biology Plant Growth and Development MCQs Set 18

Biology Objective Questions and Answers: 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.

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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: Auxin is mainly produced by -
(a) Apical root meristem
(b) Root cambium
(c) Apical shoot meristem
(d) Phloem in shoot tip
Show Answer & Explanation

Answer: (c) Apical shoot meristem

Explanation:
1. Auxin is mainly produced by the apical shoot meristem.

Teacher's Note:
1. Roots produce very little.

Question 2: Which of the following physiological effects, is common to both Auxins and Ethylene?
(a) Sprouting of potato tuber
(b) Petiole elongation in deep water rice plants
(c) Flowering in pineapple
(d) Weed killing
Show Answer & Explanation

Answer: (c) Flowering in pineapple

Explanation:
1. Both auxins and ethylene induce flowering in pineapple.

Teacher's Note:
1. 2,4-D kills weeds only.

Question 3: Which one of the following is a set of natural growth regulators ?
(a) NAA, IAA, IBA
(b) 2,4-D, IBA, BAP
(c) 2,4-D, ABA, IBA
(d) IAA, ABA, Zeatin
Show Answer & Explanation

Answer: (d) IAA, ABA, Zeatin

Explanation:
1. IAA, ABA and zeatin are naturally occurring regulators.

Teacher's Note:
1. NAA and 2,4-D are synthetic.

Question 4: Dormancy of seed is broken by :-
(a) Auxin
(b) Gibberellins
(c) Ethylene
(d) Cytokinin
Show Answer & Explanation

Answer: (b) Gibberellins

Explanation:
1. Gibberellins break seed dormancy.

Teacher's Note:
1. ABA induces dormancy.

Question 5: Regarding factors affecting the development, PGR is the :-
(a) Extrinsic factor
(b) Intrinstic intra cellular control
(c) Intrinsic extra cellular control
(d) Intrinsic inter cellular control
Show Answer & Explanation

Answer: (d) Intrinsic inter cellular control

Explanation:
1. PGRs are intrinsic, intercellular factors that control development.

Teacher's Note:
1. They are made in one cell and act in another.

Question 6: Induction of rooting in stem cutting by auxin treatment would be beneficial in which of the following -
(a) Marchantia
(b) Wheat
(c) Cuscuta
(d) Bougainvillea
Show Answer & Explanation

Answer: (d) Bougainvillea

Explanation:
1. Bougainvillea is propagated by cuttings and rooting is improved by auxin.

Teacher's Note:
1. Cuscuta and Marchantia do not.

Question 7: Which of the following increases the tolerance of plants to various kind of stresses?
(a) ABA
(b) C2H4
(c) Auxin
(d) None
Show Answer & Explanation

Answer: (a) ABA

Explanation:
1. ABA increases tolerance to stresses.

Teacher's Note:
1. It is the stress hormone.

Question 8: One of the synthetic auxin is :-
(a) IAA
(b) GA
(c) IBA
(d) NAA
Show Answer & Explanation

Answer: (d) NAA

Explanation:
1. NAA is a synthetic auxin; IAA is natural.

Teacher's Note:
1. 2,4-D is also synthetic.

Question 9: Gibberellins can promote seed germination because of their influence on :
(a) Rate of cell division
(b) Production of hydrolyzing enzymes
(c) Synthesis of abscisic acid
(d) Absorption of water through hard seed coat.
Show Answer & Explanation

Answer: (b) Production of hydrolyzing enzymes

Explanation:
1. GA induces synthesis of hydrolysing enzymes such as α-amylase that mobilise stored food in seeds.

Teacher's Note:
1. Embryo secretes GA.

Question 10: The maximum growth rate occurs in :-
(a) Exponential phase
(b) Stationary phase
(c) Senescent phase
(d) Lag phase
Show Answer & Explanation

Answer: (a) Exponential phase

Explanation:
1. Growth rate is maximum in the exponential (log) phase.

Teacher's Note:
1. It slows in the stationary phase.

Question 11:
Assertion (A): In day neutral plants there is no correlation between exposure to light duration and flowering response.
Reason (R): In Day neutral plant there is no specific requirement of light and dark hours.
(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. Day neutral plants flower regardless of day length, as they have no specific light or dark requirement.

Teacher's Note:
1. They include tomato, cucumber and sunflower.

Question 12: In plants growth is -
(a) Restricted to certain regions or structure
(b) Irreversible
(c) Change in size
(d) All the above
Show Answer & Explanation

Answer: (d) All the above

Explanation:
1. Plant growth is restricted to meristems, is irreversible and involves increase in size, so all the statements are true.

Teacher's Note:
1. Growth is an irreversible permanent increase in size.

Question 13: Seed dormancy is due to the :-
(a) Ethylene
(b) Abscisic acid
(c) IAA
(d) Starch
Show Answer & Explanation

Answer: (b) Abscisic acid

Explanation:
1. ABA promotes seed dormancy.

Teacher's Note:
1. GA breaks dormancy.

Question 14: Which of the following activities do not involve the role of GA?
(a) Seed germination
(b) malting
(c) Root growth
(d) Flowering in LDPs
Show Answer & Explanation

Answer: (c) Root growth

Explanation:
1. Root growth is controlled by auxin and not GA.

Teacher's Note:
1. GA acts in germination, malting, and flowering of LDPs.

Question 15: The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is :-
(a) Differentiating
(b) Maturing
(c) Elongating
(d) Widening
Show Answer & Explanation

Answer: (c) Elongating

Explanation:
1. Annular and spiral protoxylem elements form when the organ is elongating, as they can stretch.

Teacher's Note:
1. Later metaxylem has pitted elements.

Question 16: Plant growth regulators, which are involved in growth inhibiting activities, also play an important role in -
(a) Pattern formation in plants
(b) Tropic growth in plants
(c) Cell division and cell enlargement
(d) Plant responses to wounds and stresses
Show Answer & Explanation

Answer: (d) Plant responses to wounds and stresses

Explanation:
1. Growth inhibitors such as ABA and ethylene mediate responses to wounds and stress.

Teacher's Note:
1. They help adaptation.

Question 17: For shoot callus formation 25 ppm, BAP is required. For making 1 litre such solution, amount of BAP required is :- (molecular weight = 225)
(a) 25 gm/litre
(b) 0.25 mg/litre
(c) 2.5 mg/litre
(d) 25 mg/litre
Show Answer & Explanation

Answer: (d) 25 mg/litre

Explanation:
1. 25 ppm is 25 mg per litre.

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

Question 18: Hormone involved in induction of α-amylase in Barley endosperm :
(a) GA
(b) NAA
(c) Ethylene
(d) ABA
Show Answer & Explanation

Answer: (a) GA

Explanation:
1. GA induces α-amylase in the aleurone layer of barley endosperm.

Teacher's Note:
1. Amylase breaks starch.

Question 19: Through their effect on plant growth regulators, what do the temperature and light control in the plants?
(a) Closure of stomata
(b) Fruit elongation
(c) Apical dominance
(d) Flowering
Show Answer & Explanation

Answer: (d) Flowering

Explanation:
1. Light and temperature affect flowering through growth regulators.

Teacher's Note:
1. They regulate photoperiod and vernalisation.

Question 20: Plants bend toward the light because -
(a) They need light for photosynthesis
(b) They need light for respiration
(c) Light attracts them
(d) Cells on the shaded side elongate more
Show Answer & Explanation

Answer: (d) Cells on the shaded side elongate more

Explanation:
1. Auxin moves to the shaded side, where cells elongate more and the shoot bends towards light.

Teacher's Note:
1. Phototropism is a growth response to light.

Question 21:
Assertion (A): Spraying of gibberellin leads to early seed formation in conifers.
Reason (R): Gibberellins hastens the maturity period.
(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. Gibberellins speed up the maturity period, so seeds form early in conifers.

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

Question 22: Importance of day length in flowering of plants was first shown in:-
(a) Cotton
(b) Petunina
(c) Lemna
(d) Tobacco
Show Answer & Explanation

Answer: (d) Tobacco

Explanation:
1. Garner and Allard showed the effect of day length on flowering in tobacco (Maryland Mammoth).

Teacher's Note:
1. They called the phenomenon photoperiodism.

Question 23: In a growing plant, the first phase during the process of growth is -
(a) Cell division
(b) Cell enlargement
(c) Cell differentiation
(d) Cell maturation
Show Answer & Explanation

Answer: (a) Cell division

Explanation:
1. Growth starts with cell division in meristematic cells, followed by enlargement and differentiation.

Teacher's Note:
1. The three phases are formative, elongation and maturation.

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