Question
What is the composite fish culture? Give its two advantages.
Advantages:
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| 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 |
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Polio.

Write down differences between nucleus and nucleoid.
Define eutrophication. What is ill effect of eutrophication?
What provisions are made by local authorities to provide clean drinking water?
Describe certain bacterial diseases of human beings.