Page 3 - 3. Home assignment- Food chain and Food web
P. 3
Q.4 (a) What are secondary consumers? 3 Av
(b) How much organic matter is present at each step and how much
reaches the next trophic level?
(c) Why does the biologically useful energy decrease at different trophic
levels?
Q.5 (a) Why are food chains in nature made up of only three or four steps of 3 H
trophic levels?
(b) Why are there greater number of individuals at lower trophic levels of a
food chain in an ecosystem?
Q.6 (a) What functions are performed by food chain? 3 H
(b) Energy flow in a food chain is unidirectional. Justify.
