Question Paper
Class / Subject: Class 10 (ICSE) · Biology
Chapter: Chapter 7 — Chapter 7: Chemical Coordination in Plants (Plant Hormones)
Time Allowed: 32 minutes
Max Marks: 16
1. What do auxins promote? [1]
(A) Cell elongation and phototropism
(B) Cell death only
(C) Leaf colour change
(D) Root shortening
2. What is phototropism? [1]
(A) Growth towards light
(B) Growth away from light always
(C) No growth response to light
(D) Growth towards gravity
3. What is apical dominance? [1]
(A) Suppression of side branch growth by auxins
(B) Promotion of all branch growth equally
(C) No growth control at all
(D) Growth of roots only
4. What do gibberellins promote? [1]
(A) Stem elongation and seed germination
(B) Only leaf colour change
(C) Only root growth
(D) Cell death
5. What do cytokinins promote? [1]
(A) Cell division and delayed ageing
(B) Cell death only
(C) Faster ageing
(D) No cellular effect
6. What is abscisic acid known as? [1]
(A) The 'stress hormone'
(B) The 'growth hormone'
(C) The 'flowering hormone'
(D) The 'root hormone'
7. What does abscisic acid do during water stress? [1]
(A) Closes stomata
(B) Opens stomata further
(C) Has no effect on stomata
(D) Increases transpiration
8. Why study plant hormones? [1]
(A) To understand plant growth and stress responses
(B) No reason
(C) It's not useful
(D) Only for tests
9. What do auxins promote? [1]
(A) Cell elongation and phototropism
(B) Cell death only
(C) Leaf colour change
(D) Root shortening
10. What is phototropism? [1]
(A) Growth towards light
(B) Growth away from light always
(C) No growth response to light
(D) Growth towards gravity
11. What is apical dominance? [1]
(A) Suppression of side branch growth by auxins
(B) Promotion of all branch growth equally
(C) No growth control at all
(D) Growth of roots only
12. What do gibberellins promote? [1]
(A) Stem elongation and seed germination
(B) Only leaf colour change
(C) Only root growth
(D) Cell death
13. What do cytokinins promote? [1]
(A) Cell division and delayed ageing
(B) Cell death only
(C) Faster ageing
(D) No cellular effect
14. What is abscisic acid known as? [1]
(A) The 'stress hormone'
(B) The 'growth hormone'
(C) The 'flowering hormone'
(D) The 'root hormone'
15. What does abscisic acid do during water stress? [1]
(A) Closes stomata
(B) Opens stomata further
(C) Has no effect on stomata
(D) Increases transpiration
16. Why study plant hormones? [1]
(A) To understand plant growth and stress responses
(B) No reason
(C) It's not useful
(D) Only for tests