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प्रश्न
Answer the following question.
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 biodegradables, 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?
(b) Give one method which could be applied to reduce our intake of pesticides through food to some extent.
(c) Various steps in a food chain represent :
(a) Food web
(b) Trophic level
(c) Ecosystem
(d) Biomagnification
(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
उत्तर
(a) The maximum concentration of pesticides is found in human beings because humans are at the top of the food chain and due to biomagnification, the concentration of Dichlorodiphenyltrichloroethane (DDT) increases as one goes up the trophic levels.
(b) Instead of synthetic pesticides, organic farming should be done and more biopesticides should be used.
(c) The various steps in a food chain represent the trophic level.
Hence, the correct answer is the Trophic level.
(d) Man is a consumer with respect to various food chains operating in an ecosystem.
Hence, the correct answer is Consumer.
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संबंधित प्रश्न
Give reason to justify the following: Flow of energy in a food chain is unidirectional.
The following statement is true or false :
Secondary consumers and tertiary consumers, both are carnivores.
Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain?
The sea water contains water beetles, tadpole, fish and weeds.
Which organism is a secondary consumer?
What provides the energy which then flows through a food chain?
(a) glucose
(b) oxygen
(c) respiration
(d) sunlight
A food chain comprises of cat, seed-eating bird, plants, and dog. The organism which will have the maximum concentration of harmful pesticides coming through the food chain is most likely to be :
(a) cat
(b) plants
(c) dog
(d) seed-eating bird
A food chain consists of fish, larvae, phytoplanktons and birds. The level of pesticides in water in which the fish, larvae and phytoplanktons live is quite high.
Write the food chain comprising all the organisms mentioned above.
In a given food chain if the amount of energy at the fourth trophic level is 6 kJ, what will be the energy available at the producer level?
Green plants utilize ______ percent of sun’s energy to prepare their food by the process of photosynthesis.
Each level in the food chain is called a ______ level.
