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

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

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

4. The number of pairs of nerves which arises from the spinal cord is:

5. Iodine is necessary for the synthesis of which of the following hormone?

6. Which of the following controls the involuntary actions in the body

7. Which of the following control and regulate the life process?

8. A doctor advised a person to take an injection of insulin because his:

9. The dramatic changes in body features associated with puberty are mainly because of the secretions of:

10. Electrical impulse travels in a neuron from: