Subject: Ecological Theory

In the grasslands, trees do not replace the grasses as a part of an eological succession because
of

Which one of the following is the correct sequence of ecosystems in the order of decreasing
productivity?

With reference to food chains in ecosystems, consider the following statements :
(1). A food chain illustrates the order in which a chain of organisms feed upon each other.
(2). Food chains are found within the populations of a species.
(3). A food chain illustrates the numbers of each organism which are eaten by others.
Which of the statements given above is/are correct?

Which one of the following is the correct sequence of a food chain?

Which one of the following is the process involved in photosynthesis?

Which one of the following is the best description of the term ‘ecosystem’?

Biological Oxygen Demand (BOD) is a standard criterion for