5. When do organs and organ systems begin to develop in humans? A. In the sperm cell before fertilisation.
B. Before fertilisation and after birth.
C. In the egg cell after fertilisation.
D. After fertilisation and before birth.

6. All are the effects of alcohol EXCEPT
A. bleeding gums.
B. brain and liver damage.
C. loss of speech and memory.
D. obesity.

7. Use of vehicles, rise in industries, and burning fossil fuel contribute to
A. soil pollution
B. noise pollution
C. water pollution
D. air pollution.

8. While drinking tea, the least likely sense organ used is
A. eye.
B. nose.
C. tongue.
D. ear.​