Give suitable explanations for the following:
Eating places must be kept free of flies.

Give a suitable mechanism for the following : .

Give suitable explanations for the following: Hands must be washed before eating food.

Give suitable explanations for the following: Why does a person feel breathlessness at higher altitudes?

Give suitable explanation for the following: Grapes shrink when immersed in a very strong sugar solution.

Give suitable explanations for the following: Why does gaseous exchange continue in the lungs even during expiration ?

Give suitable explanations for the following: Why do you shiver and why do your teeth chatter when it is very cold in winter ?

Give biological explanations for the following statements: A Bat is a Mammal.

Give biological explanations for the following statements: Leguminous plants increase soil fertility.

Give biological explanations for the following: Large air cavities are present in parenchyma of aquatic plants.

Give biological explanations for the following statements: Roughage is an important part of our diet.