1. The main component of plant's cell wall and the food component stored by plant, both are zarbohydrate type chemical compound. But there are differences between their structure.
3. Robin found small green- grey watery stain in the edge of some potato leaves and rotten leaves with black spots in his potato field. He noticed a type of colorless plant is grown on cow dung fertilizer beside his field.
4. Group A: Influenza, pox, rabies
Group B: Tuberculosis, pneumonia, tetanus