Broad-leaved forests of oak are found in

Which cycle is represented by the given figure?

In ecological succession,the communities in near equilibrium with the environment are called:

Which one of the following is a characteristic feature of a cropland ecosystem?

Which of the following organisms convert plant matter into animal matter?

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.