In the following food chain,grass provides $4000 \ J$ of energy to the grasshopper. How much energy will be available to the snake and the frog? Grass $\rightarrow$ Grasshopper $\rightarrow$ Frog $\rightarrow$ Snake.

Suggest one word for each of the following statements/definitions:
$(a)$ The physical and biological world where we live in
$(b)$ Each level of food chain where transfer of energy takes place
$(c)$ The physical factors like temperature,rainfall,wind and soil of an ecosystem
$(d)$ Organisms which depend on the producers either directly or indirectly for food

Depletion of ozone is mainly due to

Accumulation of harmful chemicals in our body can be avoided. Explain how this can be achieved.

The green plants capture about $10 \%$ of the energy of sunlight that falls on their leaves and convert it into food energy.

What will be the amount of energy available to the organisms of the $2^{\text{nd}}$ trophic level of a food chain,if the energy available at the first trophic level is $10,000 \, J$?