CBSE Class 10 Science 2020 · Paper 31/1/1 · Question 4
Answer question numbers 3(a) to 3(d) and 4(a) to 4(d) on the basis of your understanding of the following paragraphs and the related studied concepts.
Human body is made up of five important components, of which water is the main component. Food as well as potable water are essential for every human being. The food is obtained from plants through agriculture. Pesticides are being used extensively for a high yield in the fields. These pesticides are absorbed by the plants from the soil along with water and minerals and from the water bodies these pesticides are taken up by the aquatic animals and plants. As these chemicals are not biodegradable, they get accumulated progressively at each trophic level. The maximum concentration of these chemicals gets accumulated in our bodies and greatly affects the health of our mind and body.
- (a)Why is the maximum concentration of pesticides found in human beings ?[1]
- (b)Give one method which could be applied to reduce our intake of pesticides through food to some extent.[1]
- (c)Various steps in a food chain represent : (a) Food web (b) Trophic level (c) Ecosystem (d) Biomagnification[1]
- (d)With regard to various food chains operating in an ecosystem, man is a : (a) Consumer (b) Producer (c) Producer and consumer (d) Producer and decomposer[1]
Answer
Pesticides accumulate most in humans at the top of the food chain; wash food; steps are trophic levels; man is a consumer.
(a) Human beings are at the top level of the food chains they belong to. Pesticides are not biodegradable, so they accumulate progressively at each trophic level (biological magnification), and the highest concentration is reached at the top, in human beings.
(b) Wash fruits, vegetables and grains thoroughly before use; organic farming, or using bio-pesticides in place of chemical ones, is equally accepted.
(c) Option (b): Trophic level.
(d) Option (a): Consumer.
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