What is menstruation? Explain.

What is calcination? Explain.

What is predation? Explain the characteristic of predation.

What is commensalism ? Explain with any two examples.

What is evolution? Explain the three evidences for evolution.

What is menstrual cycle? Explain the phases of menstrual cycle.

What is roasting ? Explain.

(a) State in brief the functions of the following organs in the human female reproductive system: Ovary, Fallopian tube. (b) What is menstruation? Why does it occur?

What is breathing ? Explain the mechanism.

What is smelting ? Explain the process with example.