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 of the following is NOT a characteristic of auxin?

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

BIOLOGY · CLASS 11 INTER I YEAR · Andhra State Board

Practice Chapter 13: Plant Growth and Development with a free chapter-wise online MCQ test for Andhra State Board CLASS 11 INTER I YEAR 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 Andhra State Board CLASS 11 INTER I YEAR 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 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.

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.

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.