Question

Fill in the blanks:

1. Physical changes occur due to some chemical substances known as ……….. 

2. Thyroid gland secretes ……………. hormone. 

3. Thymus gland secretes …………….. hormone. 

4. Our sleeping cycle is regulated by …………… hormone.

5. AIDS is caused by virus called …………..

Answer 1

1. Hormone

2. Thyroxine

3. Thymosin 

4. Melatonin 

5. H.I.V