NEET Biology Plant Growth and Development MCQs Set 15

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.

Download Plant Growth and Development MCQs with Answers

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

Question 1: An irreversible permanent increase in size of an organ or even of an individual cell is called
(a) development
(b) differentiation
(c) growth
(d) senescence
Show Answer & Explanation

Answer: (c) growth

Explanation:
1. Growth is an irreversible permanent increase in size.

Teacher's Note:
1. Development includes growth and differentiation.

Question 2: Plant growth is said to be open because
(a) it occurs only in roots
(b) it stops after flowering
(c) new cells are always added by the meristems
(d) the plant never loses leaves
Show Answer & Explanation

Answer: (c) new cells are always added by the meristems

Explanation:
1. Meristems continually add new cells to the plant body, so growth is indeterminate.

Teacher's Note:
1. Lateral meristems add to girth in dicots and gymnosperms.

Question 3: Growth of the pollen tube is best measured in terms of
(a) fresh weight
(b) area
(c) volume
(d) length
Show Answer & Explanation

Answer: (d) length

Explanation:
1. A pollen tube elongates, so its growth is measured as increase in length.

Teacher's Note:
1. Area is used for dorsiventral leaves and volume for fruits.

Question 4: Cells proximal to the meristematic zone are characterised by
(a) rapid mitosis only
(b) complete differentiation
(c) secondary wall thickening only
(d) increased vacuolation, cell enlargement and new wall deposition
Show Answer & Explanation

Answer: (d) increased vacuolation, cell enlargement and new wall deposition

Explanation:
1. These cells are in the elongation phase.

Teacher's Note:
1. Maximum size and wall thickening occur in the maturation phase.

Question 5: The sigmoid curve of growth has the phases in the order
(a) log, lag, stationary
(b) lag, log (exponential), stationary
(c) stationary, log, lag
(d) lag, stationary, log
Show Answer & Explanation

Answer: (b) lag, log (exponential), stationary

Explanation:
1. Growth starts slowly (lag), speeds up (log) and then slows (stationary) as nutrients limit.

Teacher's Note:
1. The curve is S-shaped.

Question 6: In exponential growth, the final size is given by
(a) Lt = L0 + rt
(b) W1 = W0 + rt
(c) W1 = W0 e^(rt)
(d) Lt = L0 e^(-rt)
Show Answer & Explanation

Answer: (c) W1 = W0 e^(rt)

Explanation:
1. Geometric (exponential) growth follows W1 = W0 e^(rt), where r is the relative growth rate.

Teacher's Note:
1. Arithmetic growth follows Lt = L0 + rt.

Question 7: The ability of plants to follow different pathways in response to the environment or phases of life to form different structures is called
(a) elasticity
(b) dormancy
(c) plasticity
(d) differentiation
Show Answer & Explanation

Answer: (c) plasticity

Explanation:
1. Plasticity gives heterophylly, for example the different leaf shapes of cotton, coriander and larkspur.

Teacher's Note:
1. Heterophylly may be due to phase of life or environment.

Question 8: Inhibitor B, abscission II and dormin are old names of
(a) ethylene
(b) kinetin
(c) gibberellin
(d) abscisic acid
Show Answer & Explanation

Answer: (d) abscisic acid

Explanation:
1. These names were used for the inhibitor now known as abscisic acid.

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

Question 9: The foolish seedling (bakanae) disease of rice, which led to the discovery of gibberellins, is caused by
(a) Rhizobium
(b) Pseudomonas
(c) Gibberella fujikuroi
(d) Agrobacterium
Show Answer & Explanation

Answer: (c) Gibberella fujikuroi

Explanation:
1. The fungus secreted a substance that caused excessive elongation, later named gibberellic acid.

Teacher's Note:
1. GA3 is the best known gibberellin.

Question 10: The phenomenon in which the growing apical bud inhibits the growth of lateral buds is
(a) senescence
(b) vernalisation
(c) apical dominance
(d) photoperiodism
Show Answer & Explanation

Answer: (c) apical dominance

Explanation:
1. Auxin from the apical bud suppresses axillary buds.

Teacher's Note:
1. Cytokinins help overcome apical dominance.

Question 11: Removing the shoot tip to promote growth of lateral buds, as in tea plantations and hedge making, is called
(a) girdling
(b) vernalisation
(c) pollarding of roots
(d) decapitation
Show Answer & Explanation

Answer: (d) decapitation

Explanation:
1. Decapitation removes the source of auxin and lets lateral buds grow.

Teacher's Note:
1. It makes bushy plants.

Question 12: Which hormone is used to increase the length of grape stalks, improve the shape of apples and speed up malting in brewing?
(a) Gibberellin
(b) Ethylene
(c) ABA
(d) Cytokinin
Show Answer & Explanation

Answer: (a) Gibberellin

Explanation:
1. Gibberellins elongate grape stalks and hasten malting by promoting amylase in barley seeds.

Teacher's Note:
1. GA also delays senescence of fruits.

Question 13: Which hormone helps produce new leaves and chloroplasts in leaves and delays leaf senescence?
(a) Ethylene
(b) ABA
(c) Cytokinin
(d) Auxin
Show Answer & Explanation

Answer: (c) Cytokinin

Explanation:
1. Cytokinins promote nutrient mobilisation, which delays leaf senescence, and form adventitious shoots.

Teacher's Note:
1. They act together with auxin in cell division.

Question 14: Which hormone enhances the respiration rate during ripening of fruits (respiratory climacteric)?
(a) Ethylene
(b) Auxin
(c) Cytokinin
(d) Gibberellin
Show Answer & Explanation

Answer: (a) Ethylene

Explanation:
1. Ethylene triggers the respiratory climacteric and speeds up ripening of tomatoes and apples.

Teacher's Note:
1. Ethephon releases ethylene.

Question 15: The most widely used compound as a source of ethylene is
(a) NAA
(b) kinetin
(c) zeatin
(d) ethephon
Show Answer & Explanation

Answer: (d) ethephon

Explanation:
1. Ethephon is absorbed and releases ethylene, hastening ripening and abscission.

Teacher's Note:
1. It also promotes female flowers in cucumbers.

Question 16: Which hormone stimulates closure of stomata and promotes seed dormancy?
(a) Gibberellin
(b) Abscisic acid
(c) Auxin
(d) Cytokinin
Show Answer & Explanation

Answer: (b) Abscisic acid

Explanation:
1. ABA closes stomata under stress, promotes seed development, maturation and dormancy.

Teacher's Note:
1. It is an antagonist to gibberellic acid.

Question 17: Which of the following promotes rapid internode elongation in deep-water rice?
(a) Abscisic acid
(b) Auxin only
(c) Kinetin
(d) Ethylene
Show Answer & Explanation

Answer: (d) Ethylene

Explanation:
1. Ethylene promotes elongation of internodes and petioles in deep-water rice so leaves stay above water.

Teacher's Note:
1. It also causes horizontal growth of seedlings.

Question 18: Biennial plants such as sugarbeet, cabbage and carrot
(a) flower in the first season
(b) never flower
(c) are unaffected by temperature
(d) flower and die in the second season and respond to vernalisation
Show Answer & Explanation

Answer: (d) flower and die in the second season and respond to vernalisation

Explanation:
1. Biennials are monocarpic plants that normally flower and die in the second season after exposure to cold.

Teacher's Note:
1. Vernalisation affects them.

Question 19: A plant in which flowering occurs only when the light period exceeds a critical length is a
(a) long day plant
(b) short day plant
(c) day neutral plant
(d) biennial
Show Answer & Explanation

Answer: (a) long day plant

Explanation:
1. Long-day plants need light period longer than the critical photoperiod; short-day plants need it shorter.

Teacher's Note:
1. Day-neutral plants flower regardless of day length.

Free study material for Biology

Multiple Choice Questions (MCQs) for NEET Biology Plant Growth and Development

Chapter MCQs with Answers for NEET Biology

Explore reliable practice questions for Plant Growth and Development tailored for NEET Biology learners. Use these multiple-choice formats to evaluate preparedness and strengthen problem-solving skills.

Expert Practice Material for NEET Biology

Each question includes structured solution keys mapped directly to standard NEET textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.

Complete Your Chapter Revision

Explore our broader library of printable assignments, chapter notes, and mock tests designed to support continuous revision and secure higher marks in NEET assessments.

FAQs

Where can I access latest NEET Biology Plant Growth and Development MCQs Set 15?

You can get most exhaustive NEET Biology Plant Growth and Development MCQs Set 15 for free on StudiesToday.com. These MCQs for NEET Biology are updated for the 2026-27 academic session as per NEET examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Biology NEET material?

Yes, our NEET Biology Plant Growth and Development MCQs Set 15 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the NEET paper is now competency-based.

How do practicing Biology MCQs help in scoring full marks in NEET exams?

By solving our NEET Biology Plant Growth and Development MCQs Set 15, NEET students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Biology.

Do you provide answers and explanations for NEET Biology Plant Growth and Development MCQs Set 15?

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.

Can I practice these Biology NEET MCQs online?

Yes, you can also access online interactive tests for NEET Biology Plant Growth and Development MCQs Set 15 on StudiesToday.com as they provide instant answers and score to help you track your progress in Biology.