NEET Biology Plant Growth and Development MCQs Set 05

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.

Practice Plant Growth and Development MCQs for NEET Biology

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: If a tree flowers thrice in a year in October, January and July in northen India, the plant is -
(a) Photo and thermo sensitive
(b) Photo and thermo insensitive
(c) Photosensitive but thermo insensitive
(d) Thermo sensitive but photo insensitive
Show Answer & Explanation

Answer: (b) Photo and thermo insensitive

Explanation:
1. Flowering in different seasons means the plant is neither photo- nor thermo-sensitive.

Teacher's Note:
1. Day neutral plants behave similarly.

Question 2: Apical dominance can be overcome by application of :–
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Florigen
Show Answer & Explanation

Answer: (c) Cytokinin

Explanation:
1. Cytokinin overcomes apical dominance by promoting growth of lateral buds.

Teacher's Note:
1. Auxin maintains apical dominance.

Question 3: Photoperiodism was discovered by :-
(a) Lysenko Klippart
(b) Borthwick Hendricks
(c) Garner, Allard
(d) Singer, Nicolson
Show Answer & Explanation

Answer: (c) Garner, Allard

Explanation:
1. Garner and Allard discovered photoperiodism.

Teacher's Note:
1. They used tobacco.

Question 4: Which of the following plant hormone substitutes for long photoperiod in flowering plant ?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Ethylene
Show Answer & Explanation

Answer: (b) Gibberellin

Explanation:
1. Gibberellins can replace long days and make LDPs flower under short days.

Teacher's Note:
1. Bolting is also caused by GA.

Question 5: The wavelength of light absorbed Pr form of phytochrome is :-
(a) 460 nm
(b) 560 nm
(c) 660 nm
(d) 730 nm
Show Answer & Explanation

Answer: (c) 660 nm

Explanation:
1. The Pr form of phytochrome absorbs red light at about 660 nm and is changed to Pfr.

Teacher's Note:
1. Pfr absorbs far-red at about 730 nm.

Question 6: Wheat & henbane are :-
(a) SDP
(b) DNP
(c) LNP
(d) LDP
Show Answer & Explanation

Answer: (d) LDP

Explanation:
1. Wheat and henbane are long day plants.

Teacher's Note:
1. They flower in long days.

Question 7:
Assertion (A): LDPs without leaf are unable to flower.
Reason (R): Leaves are only photopercieving structure of plants for flowering.
(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. LDPs without leaves cannot flower because leaves are the only organs that perceive the photoperiod.

Teacher's Note:
1. The flowering stimulus travels from the leaf.

Question 8: Root development is promoted by :
(a) Auxin
(b) Gibberellin
(c) Ethylene
(d) Abscisic acid
Show Answer & Explanation

Answer: (a) Auxin

Explanation:
1. Auxins promote rooting.

Teacher's Note:
1. Cuttings are dipped in IBA or NAA.

Question 9: In the following which is not a function of ethylene?
(a) Breaks bud and seed dormancy
(b) Promotes root growth
(c) Delay senescence
(d) Initiate flowering
Show Answer & Explanation

Answer: (c) Delay senescence

Explanation:
1. Ethylene promotes senescence and does not delay it.

Teacher's Note:
1. It breaks dormancy and initiates flowering.

Question 10: Indole, 3 acetic acid, called as auxin was first isolated from :-
(a) Human urine
(b) Corn germ oil
(c) Fusarium
(d) Rhizopus
Show Answer & Explanation

Answer: (a) Human urine

Explanation:
1. Auxin was first isolated from human urine (Kogl and Haagen-Smit).

Teacher's Note:
1. Indole-3-acetic acid was later identified in plants.

Question 11: Photoperiodism was first characterised in :
(a) Tobacco
(b) Potato
(c) Tomato
(d) Cotton
Show Answer & Explanation

Answer: (a) Tobacco

Explanation:
1. Photoperiodism was first characterised in tobacco.

Teacher's Note:
1. Garner and Allard discovered it.

Question 12:
Assertion (A): Winter varieties of wheat & rye are planted in autumn not in spring.
Reason (R): If winter varieties planted in spring normally they fail to flower or produce mature grain within a span of flowering season.
(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. Winter varieties need a cold treatment (vernalisation), so spring sowing fails to give flowers or grain in time.

Teacher's Note:
1. They are sown in autumn so that they get the cold.

Question 13: Phototropic curvature is the result of uneven distribution of :
(a) Gibberellin
(b) Phytochrome
(c) Cytokinins
(d) Auxin
Show Answer & Explanation

Answer: (d) Auxin

Explanation:
1. Uneven distribution of auxin gives phototropic curvature.

Teacher's Note:
1. Auxin collects on the shaded side.

Question 14: Cells/tissues arising out of the same meristem have different structures at maturity, this phenomenon in plants is called :-
(a) Open growth
(b) Open differentiation
(c) Indeterminate growth
(d) Determinate differentiation
Show Answer & Explanation

Answer: (b) Open differentiation

Explanation:
1. Cells from the same meristem differentiating into different structures show open differentiation.

Teacher's Note:
1. Plants show open growth.

Question 15: Match the columns.
Column-I: a. ABA, b. Auxin, c. Ethephon, d. GA
Column-II: i. Bolting of rosette plants, ii. Parthenocarpy in tomato, iii. Ripening of fruits, iv. Stress hormone
(a) a-iv, b-ii, c-iii, d-i
(b) a-iv, b-iii, c-ii, d-i
(c) a-iii, b-ii, c-i, d-iv
(d) a-ii, b-i, c-iii, d-iv
Show Answer & Explanation

Answer: (a) a-iv, b-ii, c-iii, d-i

Explanation:
1. ABA is the stress hormone, auxin causes parthenocarpy in tomato, ethephon causes ripening, and GA causes bolting in rosette plants.

Teacher's Note:
1. Pairs: a-iv, b-ii, c-iii, d-i.

Question 16: Growth is measured by a variety of parameters, in following which is not included ?
(a) Fresh weight
(b) Dry weight
(c) Area
(d) Cell type
Show Answer & Explanation

Answer: (d) Cell type

Explanation:
1. Growth is measured by fresh weight, dry weight, area, length and volume, not by cell type.

Teacher's Note:
1. Cell type is a feature of differentiation.

Question 17: In autumn leaf fall occurs, because -
(a) Formation of abscission layer at the base
(b) Leaf becomes heavy
(c) Leaf does not remain green
(d) Of low temperature
Show Answer & Explanation

Answer: (a) Formation of abscission layer at the base

Explanation:
1. An abscission layer forms at the base of the leaf stalk and the leaf falls.

Teacher's Note:
1. Ethylene and ABA promote this.

Question 18: The Avena curvature is used for bioassay of :
(a) ABA
(b) GA3
(c) IAA
(d) Ethylene
Show Answer & Explanation

Answer: (c) IAA

Explanation:
1. Avena curvature is a bioassay for IAA.

Teacher's Note:
1. It depends on auxin transport.

Question 19: Which of the following set denotes cytokinin?
(a) Zeatin, Kinetin, BAP
(b) IAA, NAA, Zeatin
(c) Kinetin, Gibberellin, IAA
(d) BAP, IBA, Gibberellin
Show Answer & Explanation

Answer: (a) Zeatin, Kinetin, BAP

Explanation:
1. Zeatin, kinetin and BAP are cytokinins.

Teacher's Note:
1. IAA and NAA are auxins.

Question 20: What is a stress hormone ?
(a) Benzyl aminopurine
(b) Dichlorophenoxy acetic acid
(c) Ethylene
(d) Abscisic acid
Show Answer & Explanation

Answer: (d) Abscisic acid

Explanation:
1. ABA is called the stress hormone because it helps plants tolerate stress.

Teacher's Note:
1. It closes stomata in drought.

Question 21: If 25 ppm amount of 2, 4-D is require to perform a plant function, what amounts of 2, 4-D are require for making 5 litre, 10 litre and 15 litre solutions respectively? (Molecular weight of 2, 4-D = Approx 220)
(a) 0.125 g, 0.250 g, 0.375 g
(b) 0.250 g, 0.500 g, 1.000 g
(c) 1.000 g, 0.500 g, 0.250 g
(d) 0.375 g, 0.250 g, 0.125 g
Show Answer & Explanation

Answer: (a) 0.125 g, 0.250 g, 0.375 g

Explanation:
1. 25 ppm = 25 mg per litre, so 5 L needs 125 mg = 0.125 g, 10 L needs 0.250 g and 15 L needs 0.375 g.

Teacher's Note:
1. Amount is proportional to volume.

Question 22: 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. ABA is derived from carotenoids.

Teacher's Note:
1. IAA comes from tryptophan and GA from terpenes.

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Plant Growth and Development Objective Questions & Solutions for NEET Biology

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