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

State one important function of ozone layer in the atmosphere. How is it formed there? Which compounds are responsible for the depletion of ozone layer? How do these compounds enter into the atmosphere?

"Flow of energy is unidirectional." Name the first two components of the environment involved in this flow of energy from the sun.

In the food chain
Grass $\rightarrow$ Deer $\rightarrow$ Lion
operating in a forest,what will happen if all the
$(a)$ lions are removed?
$(b)$ deers are removed?

Which of the following are always at the second trophic level of food chains?

What is the estimated amount of waste (in kg) generated by each person in an urban area every day?