Question

Maintenance of ecosystem depends upon :

• A. material cycles
• B. change in atmosphere
• C. food chains and webs
• D. energy flow

Answer 1

Answer: (A), (C), (D)

The correct options are
A material cycles
B food chains and webs
C energy flow

• Material cycles are nutrient cycles, also known as biogeochemical cycles through which there is exchange and circulation of nutrients in the biosphere.
• Food chain is series of organisms in which an organism is eating one and being eaten by other. Food web is an interconnected network of food chains. Food web ensures survival of organisms at all trophic levels because in a food web, an organism occupies more than one trophic level. It feeds on organisms of lower trophic levels and get eaten by organisms of higher trophic levels.
• Energy flow is the transfer of chemical energy from one trophic level to subsequent higher trophic levels in an ecosystem.

Hence, all these factors are involved in maintenance of an ecosystem.

So, the correct answer is options 'A, B and C'.