Name the disease caused by the deficiency of insulin hormone in the body.

Name the hormones secreted by (a) testes, and (b) ovaries.

What are the scientific names for the following receptors in animals?

(a) receptors for light

(b) receptors for heat

(c) receptors for sound

(d) receptors for smell

(e) receptors for taste

Name the disease caused by the deficiency of thyroxine hormone in the body.

Which halogen element is necessary for the making of thyroxine hormone by the thyroid gland?