Low visibility during cold weather is due to:

State whether the following statement is True or False:
Plants generally take up nitrates and nitrites and convert them into amino acids which are used to make carbohydrates.

All living organisms are basically made up of $C, N, S, P, H$ and $O$. How do they enter the living forms? Discuss.

What are the various causes of soil erosion?

In coastal areas,wind current moves from the sea towards the land during the day; but during the night,it moves from the land to the sea. Discuss the reason.

Name two chemicals present in living organisms that have carbon,hydrogen,and oxygen as their main constituents. State their main function.