Practice 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.
Access Plant Growth and Development Questions and Solutions
Navigate directly to the 50 objective questions for Plant Growth and Development using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.
Multiple Choice Questions
Assertion (A): GA3 is used to speed up the malting process in brewing industries.
Reason (R): GA3 leads to synthesis of α-amylase hydrolysing enzyme which is responsible for partial hydrolysis of starch.
(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. GA3 induces α-amylase that hydrolyses starch, which speeds malting.
Teacher's Note:
1. Malting prepares barley for brewing.
(a) Ethylene
(b) Gibberellin
(c) Cytokinin
(d) IAA
Show Answer & Explanation
Answer: (c) Cytokinin
Explanation:
1. After pruning, axillary buds are freed from apical dominance and respond to cytokinin, which promotes lateral growth.
Teacher's Note:
1. Cytokinins stimulate bud growth.
(a) Control xylem differentiation and induce cell division
(b) 2-4-D is used as herbicide for dicot weeds
(c) Promote fruit ripening
(d) Induce parthenocarpy
Show Answer & Explanation
Answer: (c) Promote fruit ripening
Explanation:
1. Auxin does not promote fruit ripening; ethylene does.
Teacher's Note:
1. Auxin induces parthenocarpy and acts as a weedicide.
Assertion (A): Growth regulators are intrinsic and intercellular factors which controls development of plant.
Reason (R): Growth regulators are produced by plant cell itself and work in cells other than those in which they synthesise.
(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. PGRs are intrinsic, intercellular factors since they are made in one cell and act in other cells.
Teacher's Note:
1. Growth regulators are produced by plant cells.
Assertion (A): ABA is stress hormone.
Reason (R): ABA causes abscission of old leaves and fruits.
(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: (b) Both A and R are true, but R is not the correct explanation of A.
Explanation:
1. ABA is the stress hormone and it causes abscission of old leaves, but this does not explain why it is a stress hormone.
Teacher's Note:
1. Its stress role is stomatal closure.
(a) The apical shoot grows faster after pruning
(b) It releases wound hormones
(c) It induces the differentiation of new shoots from the rootstock
(d) It frees axillary buds from apical dominance
Show Answer & Explanation
Answer: (d) It frees axillary buds from apical dominance
Explanation:
1. Pruning removes the apical bud, and so releases axillary buds from apical dominance, giving a dense hedge.
Teacher's Note:
1. Auxin from the tip inhibits lateral buds.
(a) Phytochrome
(b) Phytohormone
(c) Enzyme
(d) Vernalin
Show Answer & Explanation
Answer: (a) Phytochrome
Explanation:
1. Phytochrome is the pigment that perceives the photoperiodic stimulus.
Teacher's Note:
1. It exists as Pr and Pfr forms.
(a) NAA, GA3
(b) Florigen, vernalin
(c) ABA, kinetin
(d) 2,4-D, Gibberellin
Show Answer & Explanation
Answer: (b) Florigen, vernalin
Explanation:
1. Florigen and vernalin are hypothetical hormones.
Teacher's Note:
1. The others have been isolated.
(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. Went's agar block experiment allowed quantitative measurement of small amounts of auxin by the curvature.
Teacher's Note:
1. It led to the Avena bioassay.
(a) Carotenoid derivative
(b) Adenine derivative
(c) Indole compound
(d) Terpenes
Show Answer & Explanation
Answer: (d) Terpenes
Explanation:
1. Gibberellins (terpenes) elongate grape stalks and are used in wine making.
Teacher's Note:
1. They increase grape size.
(a) seed dormancy and maturation
(b) induce morphogenesis
(c) stress hormone
(d) antagonist to GA3
Show Answer & Explanation
Answer: (b) induce morphogenesis
Explanation:
1. ABA does not induce morphogenesis.
Teacher's Note:
1. ABA causes dormancy and acts against GA.
(a) Green plants seek light because they are phototropic
(b) Light stimulates plant cells on the lighted side to grow faster
(c) Auxin accumulates on the shaded side, stimulating greater cell elongation there.
(d) Green plants need light to perform photosynthesis
Show Answer & Explanation
Answer: (c) Auxin accumulates on the shaded side, stimulating greater cell elongation there.
Explanation:
1. Auxin accumulates on the shaded side and stimulates cell elongation there, bending the shoot toward light.
Teacher's Note:
1. The lit side grows less.
(a) Suppression of growth of apical bud by axillary buds
(b) Suppression of growth of axillary buds by the presence of apical bud.
(c) Stimulation of growth of axillary buds by removal of apical bud
(d) Inhibition of growth of axillary buds by removal of apical bud.
Show Answer & Explanation
Answer: (b) Suppression of growth of axillary buds by the presence of apical bud.
Explanation:
1. In apical dominance the apical bud suppresses the growth of the axillary (lateral) buds.
Teacher's Note:
1. Removing the tip releases lateral bud growth.
(a) Growth inhibitors
(b) Growth promotor
(c) Not concerned with growth at all
(d) Of little potential in agriculture
Show Answer & Explanation
Answer: (b) Growth promotor
Explanation:
1. Gibberellins are growth promoters.
Teacher's Note:
1. They are widely used in agriculture.
Assertion (A): 2,4-D is one of the selective weedicide.
Reason (R): 2,4-D is widely used to kill dicotyledonous weeds and does not affect mature monocotyledonous plants.
(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. 2,4-D kills dicot weeds without harming mature monocots, so it is selective.
Teacher's Note:
1. It is used in cereal fields.
(a) 2,4-D, IBA, Gibberalin
(b) Cytokinin, 2-4-D, NAA
(c) IAA, Zeatin, ABA
(d) Ethylene, NAA, ABA
Show Answer & Explanation
Answer: (c) IAA, Zeatin, ABA
Explanation:
1. IAA, zeatin and ABA are natural plant hormones.
Teacher's Note:
1. 2,4-D, NAA are synthetic.
(a) Cytokinin
(b) Auxin
(c) ABA
(d) All the above
Show Answer & Explanation
Answer: (a) Cytokinin
Explanation:
1. The Richmond-Lang effect is delay of leaf senescence caused by cytokinins.
Teacher's Note:
1. Cytokinins prevent breakdown of chlorophyll.
(a) Auxin
(b) Mixture of auxin and gibberellin
(c) Mixture of auxin and cytokinin
(d) Mixture of cytokinin and gibberellin
Show Answer & Explanation
Answer: (d) Mixture of cytokinin and gibberellin
Explanation:
1. Promalin, used on apple, is a mixture of gibberellin (GA4+7) and the cytokinin benzyladenine.
Teacher's Note:
1. It improves fruit shape and size.
(a) Auxin
(b) ABA
(c) Morphactin
(d) Cytokinin
Show Answer & Explanation
Answer: (d) Cytokinin
Explanation:
1. Coconut milk contains cytokinin (the coconut milk factor).
Teacher's Note:
1. It was used in tissue culture.
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Florigen
Show Answer & Explanation
Answer: (a) Auxin
Explanation:
1. 2,4-D is a synthetic auxin used as a weedicide.
Teacher's Note:
1. It kills dicot weeds.
(a) Ethylene
(b) Auxin
(c) Cytokinin
(d) Gibberellic acid
Show Answer & Explanation
Answer: (b) Auxin
Explanation:
1. Decapitation removes auxin and so the lateral buds grow.
Teacher's Note:
1. Auxin causes apical dominance.
Column-I: a. Cytokinin, b. Ethylene, c. ABA, d. Auxin
Column-II: I. Senescence, II. Seed development, III. Cell growth, IV. Helpful in shoot and root formation
(a) a-III, b-I, c-II, d-IV
(b) a-I, b-II, c-III, d-IV
(c) a-II, b-I, c-III, d-IV
(d) a-III, b-I, c-IV, d-II
Show Answer & Explanation
Answer: (a) a-III, b-I, c-II, d-IV
Explanation:
1. Cytokinin helps cell growth and division, ethylene is linked with senescence, ABA with seed development and auxin with shoot and root formation.
Teacher's Note:
1. Auxin and cytokinin together control organ formation in culture.
(a) Auxin
(b) Gibberellin
(c) Kinetin
(d) Zeatin
Show Answer & Explanation
Answer: (c) Kinetin
Explanation:
1. Kinetin is not found in plants; it is a synthetic (DNA-derived) cytokinin.
Teacher's Note:
1. Zeatin is the natural one.
Practice MCQs for NEET Biology Plant Growth and Development
Download Multiple Choice Questions: Plant Growth and Development (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.
Concept Clarification for Plant Growth and Development
Each question includes structured solution keys mapped directly to standard NEET textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.
Additional Study Resources for NEET Biology
Wrap up your chapter revision by testing your knowledge against standard question formats. Everything on our platform is provided free of charge.
FAQs
You can get most exhaustive NEET Biology Plant Growth and Development MCQs Set 04 for free on StudiesToday.com. These MCQs for NEET Biology are updated for the 2026-27 academic session as per NEET examination standards.
Yes, our NEET Biology Plant Growth and Development MCQs Set 04 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the NEET paper is now competency-based.
By solving our NEET Biology Plant Growth and Development MCQs Set 04, NEET students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Biology.
Yes, Biology MCQs for NEET have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused NEET exams.
Yes, you can also access online interactive tests for NEET Biology Plant Growth and Development MCQs Set 04 on StudiesToday.com as they provide instant answers and score to help you track your progress in Biology.