Write two methods to reduce the use of pesticides.

In the given food chain,suppose the amount of energy at the fourth trophic level is $5 \, kJ$,what will be the energy available at the producer level? (in $kJ$)
Grass $\rightarrow$ Grasshopper $\rightarrow$ Frog $\rightarrow$ Snake $\rightarrow$ Hawk

Suggest suitable mechanism$(s)$ for waste management in fertiliser industries.

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.

Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called

How many molecules of ozone can be decomposed by one atom of chlorine?