Unit 1 Chapter 6: Plant Growth and Development — Online MCQ Test
BOTANY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Unit 1 Chapter 6: Plant Growth and Development with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers plant growth kinetics differentiation dedifferentiation redifferentiation plant growth regulators auxins gibberellins cytokinins ethylene ABA photoperiodism and....
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Unit 1 Chapter 6: Plant Growth and Development — Important Questions & Answers
Which of the following best defines plant growth?
- A. Permanent increase in size, dry mass, or cell number
- B. Temporary increase in turgidity only
- C. Only increase in height of the plant
- D. Formation of flowers only
Answer: A. Permanent increase in size, dry mass, or cell number
Plant growth is a permanent and irreversible increase in size, mass, or number of cells. It is not limited to height or temporary changes.
Plant growth is a permanent and irreversible increase in size, mass, or number of cells. It is not limited to height or temporary changes.
The plant hormone responsible for cell elongation in shoots is:
- A. Cytokinin
- B. Auxin
- C. Abscisic acid
- D. Ethylene
Answer: B. Auxin
Auxin promotes cell elongation in shoots and is one of the earliest discovered plant growth regulators.
Auxin promotes cell elongation in shoots and is one of the earliest discovered plant growth regulators.
In a short-day plant, flowering is induced when the plant receives:
- A. A long uninterrupted dark period
- B. A short dark period
- C. Continuous light for 24 hours
- D. Only red light
Answer: A. A long uninterrupted dark period
Short-day plants flower only when the night length exceeds a critical duration, meaning they need a long uninterrupted dark period.
Short-day plants flower only when the night length exceeds a critical duration, meaning they need a long uninterrupted dark period.
Which sequence correctly represents the usual order of cellular changes during plant development?
- A. Differentiation → Dedifferentiation → Redifferentiation
- B. Dedifferentiation → Differentiation → Redifferentiation
- C. Redifferentiation → Dedifferentiation → Differentiation
- D. Differentiation → Redifferentiation → Dedifferentiation
Answer: A. Differentiation → Dedifferentiation → Redifferentiation
Cells first differentiate into specialized cells, then some may dedifferentiate and later redifferentiate into specialized tissues again.
Cells first differentiate into specialized cells, then some may dedifferentiate and later redifferentiate into specialized tissues again.
Which statement about plant growth kinetics is correct?
- A. Growth rate remains constant throughout the growth period
- B. Growth often shows an S-shaped curve due to different phases
- C. Growth occurs only after flowering
- D. Growth is unrelated to cell division
Answer: B. Growth often shows an S-shaped curve due to different phases
Plant growth commonly follows a sigmoid or S-shaped curve with lag, exponential, and stationary phases. This reflects changes in growth rate over time.
Plant growth commonly follows a sigmoid or S-shaped curve with lag, exponential, and stationary phases. This reflects changes in growth rate over time.