Multiple Choice Questions (MCQs) for NEET Biology: Plant Growth and Development
Explore reliable objective questions for Plant Growth and Development tailored for NEET learners. Utilizing these Biology multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.
Practice Plant Growth and Development MCQs for NEET Biology
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Multiple Choice Questions
(a) Lt = L0ert
(b) W1 = W0ert
(c) Lt = L0 + rt
(d) L0 = Lt + rt
Show Answer & Explanation
Answer: (c) Lt = L0 + rt
Explanation:
1. Arithmetic growth is Lt = L0 + rt.
Teacher's Note:
1. Exponential growth is Lt = L0 e^(rt).
(a) Chales Darwin
(b) Kogl
(c) F.W. Went
(d) Skoog
Show Answer & Explanation
Answer: (c) F.W. Went
Explanation:
1. F.W.
2. Went isolated auxin from oat coleoptile tips.
Teacher's Note:
1. Darwin first showed the influence of tip.
(a) Auxin
(b) Cytokinin
(c) Gibberellin
(d) Ethylene
Show Answer & Explanation
Answer: (a) Auxin
Explanation:
1. Auxin from the apical bud is responsible for apical dominance.
Teacher's Note:
1. Cytokinin opposes the effect.
(a) 30 tonnes per acre
(b) 40 tonnes per acre
(c) 20 tonnes per acre
(d) 50 tonnes per acre
Show Answer & Explanation
Answer: (c) 20 tonnes per acre
Explanation:
1. Spraying sugarcane with gibberellins increases stem length and yield by up to 20 tonnes per acre.
Teacher's Note:
1. Gibberellins increase stem length.
(a) Light and temperature
(b) Temperature and relative humidity
(c) Light and wind
(d) Rainfall and temperature
Show Answer & Explanation
Answer: (a) Light and temperature
Explanation:
1. Light and temperature are the two main climatic factors affecting plant growth.
Teacher's Note:
1. Water and nutrients are also needed.
Assertion (A): Buttercup produces two different kind of leaves within the same plant body.
Reason (R): Plants can follow different pathways in response to environment or phases of life to form different kinds of structures, due to plasticity.
(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. Buttercup shows heterophylly, which is an example of plasticity in response to environment.
Teacher's Note:
1. Plasticity explains it.
(a) IBA, IAA, NAA
(b) IAA, BAP, NAA
(c) 2,4-D, GA3, IAA
(d) 2,4-D, GA3, NAA
Show Answer & Explanation
Answer: (a) IBA, IAA, NAA
Explanation:
1. IBA, IAA and NAA are all auxins.
Teacher's Note:
1. GA3 is a gibberellin and BAP is a cytokinin.
(a) Delay leaf senescence ⇒ Cytokinin
(b) Induce rooting in a twig ⇒ Auxin
(c) Induce growth in axillary bud ⇒ Auxin
(d) Quickly ripen a fruit ⇒ Ethylene
Show Answer & Explanation
Answer: (c) Induce growth in axillary bud ⇒ Auxin
Explanation:
1. Auxin keeps axillary buds dormant; cytokinin promotes their growth, so the match is wrong.
Teacher's Note:
1. Cytokinin delays leaf senescence.
Assertion (A): Cytokinins helps in the delay of leaf senescence.
Reason (R): Cytokinin leads to mobilisation of nutrients.
(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. Cytokinins delay senescence by mobilising nutrients towards the leaves.
Teacher's Note:
1. They act through the Richmond-Lang effect.
(a) Shoot elongation
(b) Cell elongation and cell wall formation
(c) Cell division
(d) Leaf fall and dormancy
Show Answer & Explanation
Answer: (d) Leaf fall and dormancy
Explanation:
1. ABA induces dormancy and promotes leaf abscission.
Teacher's Note:
1. It is a growth inhibitor.
(a) Always as growth promotors
(b) Always are growth inhibitors
(c) Some as promotors and some as inhibitors
(d) Rarely as growth inducers
Show Answer & Explanation
Answer: (c) Some as promotors and some as inhibitors
Explanation:
1. Some hormones such as auxins, GA and cytokinins promote growth, while ABA inhibits it.
Teacher's Note:
1. Ethylene may promote or inhibit.
(a) Auxin
(b) GA3
(c) Kinetin
(d) ABA
Show Answer & Explanation
Answer: (b) GA3
Explanation:
1. GA3 speeds up malting by inducing α-amylase.
Teacher's Note:
1. Brewers use it.
Assertion (A): Kinetin is synthetic cytokinin.
Reason (R): Kinetin was obtained from herring sperm DNA.
(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. Kinetin is a synthetic cytokinin and it was got from herring sperm DNA; however, the source does not explain why it is called synthetic.
Teacher's Note:
1. It is not found naturally in plants.
(a) Linear
(b) Stair-steps shaped
(c) Parabolic
(d) Sigmoid
Show Answer & Explanation
Answer: (d) Sigmoid
Explanation:
1. Growth in plants follows a sigmoid curve with lag, exponential and stationary phases.
Teacher's Note:
1. It is an S-shaped curve.
(a) Auxin increases
(b) Auxin decreases
(c) Abscisic acid decreases
(d) Gibberellic acid decreases
Show Answer & Explanation
Answer: (b) Auxin decreases
Explanation:
1. Leaf fall is favoured when auxin content falls, as auxin normally delays abscission.
Teacher's Note:
1. ABA and ethylene promote abscission.
(a) IAA
(b) GA
(c) ABA
(d) 2, 4-D
Show Answer & Explanation
Answer: (b) GA
Explanation:
1. The foolish seedling (bakanae) disease of rice, due to the fungus Gibberella, led to discovery of gibberellins.
Teacher's Note:
1. Infected plants grow very tall.
(a) Toxic effect of some plant hormones
(b) Genetic nature
(c) Limited nutrient supply
(d) Absence of differentiation.
Show Answer & Explanation
Answer: (c) Limited nutrient supply
Explanation:
1. The exponential phase slows when nutrients and space become limiting.
Teacher's Note:
1. Then stationary phase starts.
(a) Gibberellin
(b) NAA
(c) Florigen
(d) IAA
Show Answer & Explanation
Answer: (c) Florigen
Explanation:
1. Florigen is a hypothetical flowering hormone formed in leaves and sent to shoot apices.
Teacher's Note:
1. It has not yet been isolated.
(a) Is a hormone whose main function is to induce the cell division
(b) Induce bolting
(c) Induce senescence
(d) Causes dormancy
Show Answer & Explanation
Answer: (a) Is a hormone whose main function is to induce the cell division
Explanation:
1. Cytokinins promote cell division (cytokinesis).
Teacher's Note:
1. They delay senescence and release lateral buds.
Assertion (A): Ethylene increases the yield of cucurbits.
Reason (R): Ethylene does not allow preharvest fruit drop.
(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: (c) A is true, but R is false.
Explanation:
1. Ethylene increases cucurbit yield by promoting female flowers, but it does not stop fruit drop; it promotes abscission.
Teacher's Note:
1. The assertion is true and the reason is false.
(a) Plasticity
(b) Senescence
(c) Photoperiodism
(d) Vernalisation
Show Answer & Explanation
Answer: (a) Plasticity
Explanation:
1. Plasticity is the ability of plants to form different structures in response to environment.
Teacher's Note:
1. Heterophylly is an example.
(a) Respiration
(b) Photosynthesis
(c) Perception of light stimulus
(d) Transpiration
Show Answer & Explanation
Answer: (c) Perception of light stimulus
Explanation:
1. The tip perceives the light stimulus and makes auxin, so removing it stops bending and growth.
Teacher's Note:
1. Darwin's experiments showed this.
(a) Abscissic acid
(b) Ethylene
(c) GA3
(d) Indole acetic acid
Show Answer & Explanation
Answer: (a) Abscissic acid
Explanation:
1. ABA is the stress hormone.
Teacher's Note:
1. It closes stomata.
Multiple Choice Questions (MCQs) for NEET Biology Plant Growth and Development
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FAQs
You can get most exhaustive NEET Biology Plant Growth and Development MCQs Set 16 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 16 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 16, 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 16 on StudiesToday.com as they provide instant answers and score to help you track your progress in Biology.