9th A Bio Work sheet

1.What are the different types of cutaneous receptors? State their foundation.

2. Describe nitrogen cycle.

3.Write about any four defects of the eye in detail.

4.What are the artificial causes of soil erosion? Suggest few measures to avoid soil erosion.

5.Define the terms

            (i) Biological magnification

            (ii) Ethology

6.Draw a neat labeled diagram of human eye