Page 2 - 3. Home assignment- Food chain and Food web
P. 2
Q.7 First link in any food chain is usually green plants because - 1
(a) they are widely distributed
(b) they are fixed at one place in the soil
(c) they alone have the capacity to synthesise food using sunlight
(d) there are more herbivores than carnivores
Q.8 1
An ecosystem is represented in the figure given above. This ecosystem will be self-
sustaining if -
(a) the type of organisms represented by B are eliminated.
(b) materials cycle between the organisms labelled A and the organisms labelled B.
(c) the organisms labelled A outnumber the organisms labelled B.
(d) the organisms labelled A are equal in number to the organisms labelled B.
Q.9 In an ecosystem, herbivores represent - 1
(a) producers
(b) primary consumers
(c) secondary consumers
(d) decomposers
Q.10 Which group of organisms are not constituents of a food chain? 1
(a) Grass, lion, rabbit
(b) Plankton, man, fish, grasshopper
(c) Wolf, grass, snake, tiger
(d) Frog, snake, eagle, grass, grasshopper
Subjective
Q.1. What is a trophic level? 1 E
Q.2 What function is performed by the producers? 1 E
Q.3 (a) Suggest a food chain in which one of the trophic levels is occupied by 3 Av
humans.
(b) In the following food chain,100J of energy is available to the lion. How
much energy was available to the producer?
Plants Deer Lion
(c) If autotrophs occupying the first trophic level are called producers, what
are herbivores called as?
