Question

(b)
(
d)
B
R.19 Read the following and answer any four questions from 19 (1) to 19 (v).
Pesticides are sprayed to kill, pests on food plants. The food plants are eaten by herbivores and along with ti-
herbivores, pesticides also enter the body of the carnivore. Humans eat both plants and animals and pestici
food, pesticides are also eaten by the herbivores. Herbivores are further eaten by carnivores and along with t
along with food enters the body of humans.
In an ecosystem, herbivores represent
(a) producers
primary consumers
(c) secondary consumers
(d)
or composers
A food chain comprising birds, green plants, fish and man.
The concentration of harmful chemical entering the food chain will be maximum in
(a)
green plants
(b) man
(c) birds
fish
Trophic level in an ecosystem represents
(a) oxygen level (b) water level
energy level
(d) salt level
(iv) First link in any food chain is usually green plants because
(a) they are widely distributed
(b) they are fixed at one place in the soil
(c) they alone have the capacity to synthesize food using sunlight
(d) there are more herbivores than carnivores:
Accumulation of chemicals at the successive trophic levels of a food chain is called
(a) pollution
(b) biomagnifications
(c) fertilizer
(d) disposal
Read the following and answer any four questions from 20 (i) to 20 (v).
nofthe leading scientists of 19th century, played a crucial role in understanding electro​

Answer 1

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