Page 2 - HA 1

8. The plant hormone which triggers the fall of mature leaves and fruits from the
plant body is:
a. Auxin
b. Gibberellin
c. Abscisic acid
d. Cytokinin

9. The stimulus in the process of thigmotropism is:
a. Touch
b. Gravity
c. Light
d. Chemical

10. Sunflower moves towards light
a. Quickly
b. Slowly
c. Moderately
d. Does not move

Subjective

Q.NO QUESTIONS Marks Level

1. Define chemotropism. 1 E

2. Name the parts of a plant that exhibits positive and negative 1 E
phototropism.
3. a) Name the plant hormones responsible for the following - 3 Av

a. Elongation of cells
b. Growth of stem
c. Promotion of cell division
d. Falling of senescent leaves
b) Name the hormone which is involved in phototropism. Explain
its role.

4. In the given figures, (a), (b) and (c), which appears more 3 Av
accurate and why? Explain what happens in all the three cases.