MCQs from CBSE Class 10 Science Chapter 7: Control and Coordination

1. The movement of a plant part in response to the force of attraction exerted by the earth is called:

(a)Geotropism
(b)Hydrotropism
(c) Chemotropism
(d) Phototropism

2. A big tree falls in a forest, but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertically). This happens in response to:

(a) Water and light
(b) Water and minerals
(c) Light and gravity
(d) Gravity and water

3.The main function of the plant hormone called abscisic acid is to:

(a) Increase the length of cells
(b) Promote cell division