Food chains do not exist in isolation. Give reasons.

Amphibians do not have exoskeleton. Give reason.

Amphibians do not have exoskeleton. Give reason.

Why holes do not exist in a conductor.

Digestion of fats take place only after the food reaches small intestine. Give reason.

Answer the following questions: Explain : Force always occur in pairs or an isolated single force does not exist in the universe.

Why do muscles show spasm after rigourous contraction? OR Muscles show spasm after rigorous contraction. Give reason.

Food chain in an aquatic ecosystem

Food chain in a forest ecosystem:

How do atoms of an element exist in nature ?

Construct food chains like the one shown in figure 7.1