CBSE Class 10 Science 2020 · Paper 31/5/3 · Question 18(a)
- (a)Create a food chain of the following organisms : Insect, Hawk, Grass, Snake, Frog
- (b)Name the organism at the third trophic level of the created food chain.
- (c)Which organism of this food chain will have the highest concentration of non-biodegradable chemicals ?
- (d)Name the phenomenon associated with it.
- (e)If 10,000 joules of energy is available to frogs, how much energy will be available to snakes in this food chain ?
Answer
Frog is at the third level; the hawk has the highest chemical concentration (biological magnification); snakes get 1000 J.
(a)
(b) The frog is at the third trophic level (grass is the first and the insect the second).
(c) The hawk, at the top of the food chain, has the highest concentration of non-biodegradable chemicals.
(d) Biological magnification (biomagnification).
(e) By the ten per cent law, the energy available to snakes J J.
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