Growth in Plants

6. Which plant hormone is responsible for controlling the bending of plant stems towards light?

a) Auxin

b) Gibberellins

c) Cytokinins

d) Ethylene

7. What is the process by which plants respond to touch or external stimuli called?

a) Phototropism

b) Gravitropism

c) Thigmotropism

d) Hydrotropism

8. Which plant hormone is responsible for controlling the opening and closing of stomata?

a) Auxin

b) Gibberellins

c) Abscisic acid

d) Ethylene

9. In which direction does the root of a plant exhibit positive gravitropism?

a) Towards gravity

b) Away from gravity

c) Parallel to gravity

d) Randomly

10. Which plant hormone is responsible for promoting fruit ripening?

a) Auxin

b) Gibberellins

c) Cytokinins

d) Ethylene