Chapter Exam

Chapter 13: Plant Growth and Development — Online MCQ Test

Q: Which plant hormone is commonly called the 'stress hormone' in plants?

Answer: C. Abscisic acid — Abscisic acid (ABA) is known as the stress hormone because it helps plants respond to adverse conditions like drought.

Q: Which hormone promotes cell division in plants?

Answer: A. Cytokinin — Cytokinins stimulate cell division, especially in actively growing tissues such as meristems.

Q: The response of plants to day length is called:

Answer: B. Photoperiodism — Photoperiodism refers to the physiological response of plants to the relative lengths of day and night.

Q: Which of the following is NOT a characteristic of auxin?

Answer: D. Promotes fruit ripening — Fruit ripening is mainly associated with ethylene, not auxin.

Q: A gardener removes the apical bud of a plant. What is the most likely effect?

Answer: A. Increase in lateral bud growth — The apical bud produces auxin, which maintains apical dominance. Removing it reduces auxin and allows lateral buds to grow.

Q: A farmer wants to increase the size of grapes on the vine. Which hormone is most likely to be applied?

Answer: B. Gibberellin — Gibberellins are known to increase fruit size in some plants, including grapes.

Q: A farmer wants to break dormancy in potato tubers. Which treatment is most appropriate according to NCERT concepts?

Answer: C. Provide gibberellin treatment — Gibberellins can help break dormancy and promote sprouting in several plant parts including tubers.

BIOLOGY · CLASS 11 FIRST PUC · Karnataka State Board

Practice Chapter 13: Plant Growth and Development with a free chapter-wise online MCQ test for Karnataka State Board CLASS 11 FIRST PUC BIOLOGY. This chapter covers: Plant Growth Development Germination Auxins Gibberellins Cytokinins Abscisic Acid Ethylene Photoperiodism Vernalization. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 13: Plant Growth and Development — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 11 FIRST PUC BIOLOGY — Chapter 13: Plant Growth and Development, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the best definition of plant growth?

A. Permanent increase in mass only
B. Irreversible increase in size and mass due to cell division and cell enlargement ✓
C. Temporary increase in turgidity
D. Only an increase in number of leaves

Answer: B. Irreversible increase in size and mass due to cell division and cell enlargement
Plant growth is an irreversible increase in size and mass brought about by cell division, cell enlargement, and differentiation.

Which plant hormone is commonly called the 'stress hormone' in plants?

A. Auxin
B. Gibberellin
C. Abscisic acid ✓
D. Cytokinin

Answer: C. Abscisic acid
Abscisic acid (ABA) is known as the stress hormone because it helps plants respond to adverse conditions like drought.

Which hormone promotes cell division in plants?

A. Cytokinin ✓
B. Ethylene
C. Abscisic acid
D. Jasmonic acid

Answer: A. Cytokinin
Cytokinins stimulate cell division, especially in actively growing tissues such as meristems.

The response of plants to day length is called:

A. Phototropism
B. Photoperiodism ✓
C. Geotropism
D. Hydrotropism

Answer: B. Photoperiodism
Photoperiodism refers to the physiological response of plants to the relative lengths of day and night.

Which of the following is NOT a characteristic of auxin?

A. Promotes apical dominance
B. Promotes cell elongation
C. Stimulates root initiation at low concentrations
D. Promotes fruit ripening ✓

Answer: D. Promotes fruit ripening
Fruit ripening is mainly associated with ethylene, not auxin.

A gardener removes the apical bud of a plant. What is the most likely effect?

A. Increase in lateral bud growth ✓
B. Immediate fruit ripening
C. Seed dormancy increases
D. Leaf senescence stops completely

Answer: A. Increase in lateral bud growth
The apical bud produces auxin, which maintains apical dominance. Removing it reduces auxin and allows lateral buds to grow.

Which of the following best explains why seed dormancy is beneficial?

A. It ensures seeds germinate only in unsuitable conditions
B. It prevents germination during unfavorable seasons ✓
C. It reduces the need for water in seeds permanently
D. It stops embryo formation

Answer: B. It prevents germination during unfavorable seasons
Dormancy helps seeds survive adverse conditions and germinate only when environmental conditions become favorable.

A farmer wants to increase the size of grapes on the vine. Which hormone is most likely to be applied?

A. Auxin
B. Gibberellin ✓
C. Abscisic acid
D. Ethylene

Answer: B. Gibberellin
Gibberellins are known to increase fruit size in some plants, including grapes.

In the context of plant growth regulators, which of the following is the most accurate statement?

A. Each hormone acts independently with no interaction
B. Plant responses are often controlled by a balance among multiple hormones ✓
C. Only one hormone is active in a plant at any time
D. Hormones are present only in mature plants

Answer: B. Plant responses are often controlled by a balance among multiple hormones
Plant growth and development are regulated by the interaction and balance of multiple hormones, not a single hormone alone.

A farmer wants to break dormancy in potato tubers. Which treatment is most appropriate according to NCERT concepts?