Choose the incorrect statement.

The first link in any food chain is a green plant because

Organisms that consume milk and curd can be classified as ........

Phosphorus of the ocean becomes available to land plants due to:

Which of the following statements are correct regarding a food chain?
$(a)$ If $80\%$ of tigers are removed from an area,the growth of vegetation in that area increases.
$(b)$ If carnivores are removed from an area,the population growth of deer increases.
$(c)$ The length of a food chain is limited to $3$ to $4$ trophic levels because the amount of energy decreases in the ecosystem.
$(d)$ The length of a food chain is usually $2$ to $8$ trophic levels.

Maximum photosynthesis occurs through .......