Question
Identify the cross performed between two plants belonging to different species.
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Mention any three human activities which are responsible for depletion of the ozone layer.
Give an account of some important viral diseases of human beings.

What is simple tissue? Classify and explain its Different types with suitable diagram.
Give one point of difference between notochord and nerve cord.
Explain natural and human-made sources of air pollution.
What are biofertilizers? In what sense are they better than chemical fertilizers?
| Column I | Column II | ||
| a. | Fungal disease | i. | Dengue fever |
| b. | Viral disease | ii. | Cholera |
| c. | Protozoan disease | iii. | Skin disease |
| d. | Bacterial disease | iv. | Malaria |