A pesticide which is a chlorinated hydrocarbon is sprayed on a food crop. The food chain is: Food crop - Rat - Snake - Hawk. In this food chain, the highest concentration of the pesticide would accumulate in which one of the following?

Which of the following represent the food chain in a forest?

Which of the following limits the number of trophic levels in a food chain ?

Which of the following organisms convert inorganic substances into organic compounds using sunlight in the presence of chlorophyll?

Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

Which of the following are constituents of an ecosystem?