Chapter Exam

Chapter 15: Plant Growth and Development — Online MCQ Test

Q: Which plant hormone is primarily responsible for apical dominance?

Answer: A. Auxin — Auxin is produced in the apical meristem and inhibits the growth of lateral buds, a phenomenon known as apical dominance.

Q: What is the primary effect of Gibberellins on plants?

Answer: B. Stem elongation — Gibberellins are well known for promoting internode elongation in genetically dwarf plants.

Q: Which plant hormone is commonly known as the 'stress hormone'?

Answer: C. Abscisic Acid (ABA) — ABA is called the stress hormone because it increases plant tolerance to various stresses, particularly water stress by closing stomata.

Q: If a plant is exposed to light from only one side, which hormone redistributes to the shaded side causing bending?

Answer: C. Auxin — Auxin accumulates on the shaded side, promoting faster cell elongation there, which causes the plant to bend towards the light.

BOTANY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 15: Plant Growth and Development with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th BOTANY. This chapter covers: The final chapter covers plant growth kinetics hormones including auxins gibberellins cytokinins ethylene and ABA. Students explore photoperiodism vernalization seed dormancy and p.... AI-generated questions from basic to board-exam level, with instant results and explanations.

Questions

20m

Time Limit

Attempts Left

10 random questions from this chapter (mixed difficulty)
Questions you've seen before won't repeat until the pool resets
You have 20 minutes — exam auto-submits when time is up
Maximum 3 attempts per chapter
Results and explanations shown immediately after submission

New here? Register free — includes 3 free chapter exams.

Chapter 15: Plant Growth and Development — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th BOTANY — Chapter 15: Plant Growth and Development, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which plant hormone is primarily responsible for apical dominance?

A. Auxin ✓
B. Gibberellin
C. Cytokinin
D. Ethylene

Answer: A. Auxin
Auxin is produced in the apical meristem and inhibits the growth of lateral buds, a phenomenon known as apical dominance.

What is the primary effect of Gibberellins on plants?

A. Root initiation
B. Stem elongation ✓
C. Leaf senescence
D. Fruit ripening

Answer: B. Stem elongation
Gibberellins are well known for promoting internode elongation in genetically dwarf plants.

Which plant hormone is commonly known as the 'stress hormone'?

A. Auxin
B. Cytokinin
C. Abscisic Acid (ABA) ✓
D. Gibberellin

Answer: C. Abscisic Acid (ABA)
ABA is called the stress hormone because it increases plant tolerance to various stresses, particularly water stress by closing stomata.

If a plant is exposed to light from only one side, which hormone redistributes to the shaded side causing bending?

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

Answer: C. Auxin
Auxin accumulates on the shaded side, promoting faster cell elongation there, which causes the plant to bend towards the light.

Consider a long-day plant. Which of the following treatments would most likely lead to flowering in the middle of winter in a greenhouse?

A. Extending the night period using artificial lights
B. Exposing the plant to a flash of light during the dark period ✓
C. Applying high concentrations of ABA
D. Keeping the temperature at freezing levels

Answer: B. Exposing the plant to a flash of light during the dark period
Long-day plants are sensitive to the night length. Interrupting the dark period with a flash of light tricks the plant into sensing a shorter night, triggering flowering.

← Previous Chapter

Chapter 14: Respiration