control and coordination part 2

1. Which plant hormone promotes dormancy in seeds and buds?

• (a) Auxin

• (b) Gibberellin

• (c) Cytokinin

• (d) Abscisic acid

2. Roots of plants are:

• (a) positively geotropic

• (b) negatively geotropic

• (c) positively phototropic

• (d) None of these

3. Response of plant roots towards water is called:

• (a) Chemotropism

• b) Phototropism

• (c) Hydrotropism

• (d) Geotropism

4. Movement of sunflower in accordance with the path of Sun is due to

• (a) Chemotropism

• (b) Geotropism

• (c) Phototropism

• (d) Hydrotropism

5. Which plant hormone promotes cell division?

• (a) Auxin

• (b) Gibberellin

• (c) Cytokinin

• (d) Abscisic acid

6. The main function of abscisic acid in plants is

• (a) to promote cell division.
  

• (b) to inhibit growth.

• (c) to promote growth of stem.

• (d) to increase the length of cells.

7. Fall of mature leaves and fruits from plants is triggered by which of the following substance?

• (a) Auxin

• (b) Cytokinin

• (c) Gibberellin

• (d) Abscisic acid

8. Any change in the environment to which an organism responds is called

• (a) stimulus

• (b) coordination

• (c) response

• (d) hormone

9. A part of the body which responds to the in-structions sent from nervous system is called

• (a) receptor

• (b) effector

• (c) nerves

• (d) muscles

10. The longest fibre on the cell body of a neuron is called

• (a) sheath

• (b) cytoplasm

• (c) axon

• (d) dendrites