The end product of carbohydrate metabolism is

If oxygen content is reduced to $1\%$,the rate of respiration becomes

In which of the following is energy released?

For the existence of nitrogen in its stable molecular form,how many nitrogen atoms are required?

How many statements from the following are correct?
$(a)$ In plants,phosphorylation occurs by three different ways.
$(b)$ Substrate level phosphorylation is a direct phosphorylation of $ADP$ by transfer of a phosphate group from any suitable substance.
$(c)$ Substrate level phosphorylation occurs in the cytoplasm of the cell only.
$(d)$ Oxidative phosphorylation occurs on the inner mitochondrial membrane only.

Which of the following is the reverse of photosynthesis?