(a) (i) What is the effect of gravity on plant growth?
(ii) Describe an experiment to demonstrate the effect of gravity on the roots of plants.

(b) Explain how bitter taste is detected in humans.

(c) Copy and complete the table below on endocrine glands and their functions. 

S/N	Endocrine glands	Hormone produced	functions
1	Thyroid
2		Insulin
3			Development of secondary sexual characters of females