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प्रश्न
What is meant by bioconcentration of pesticides
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उत्तर
The increase in the concentration of harmful chemical substances, such as pesticides, in the body of living organisms at each trophic level of a food chain is called bioconcentration of pesticides.
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संबंधित प्रश्न
What will happen if we kill all the organisms in one trophic level?
Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
What are planktons?
The following statement is true or false :
In biology, human beings are called producers.
Which of the following belong to the same trophic level?
Tree ; Frog ; Snake ; Grass ; Lizard
Fill in the following blank with suitable word :
A series of organisms, each of which feeds on the next organism, the beginning of which is a green plant, is called a .............
Name one decomposer.
Draw the food chain with four trophic levels.
Write down a food chain in the sea.
Which of the following is not a producer?
(a) grass
(b) zooplankton
(c) phytoplankton
(d) paddy
What would happen to the number of grass plants and foxes if the number of rabbits increased?
In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?
Fill in the following blank with suitable word :
Grass → ........... → Human
What provides the energy which then flows through a food chain?
(a) glucose
(b) oxygen
(c) respiration
(d) sunlight
The harmful chemical which is accumulating in human beings through food chain is :
(a) benzenehexachloride
(b) dichlorodiphenyltrichloroethane
(c) chlorofluorocarbon
(d) abscisic acid
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.
- Why is the maximum concentration of pesticides found in human beings? (1)
- Give one method which could be applied to reduce our intake of pesticides through food to some extent. (1)
- Various steps in a food chain represent:
- Food web
- Trophic level
- Ecosystem
- Biomagnification (1)
- With regard to various food chains operating in an ecosystem, man is a:
- Consumer
- Producer
- Producer and consumer
- Producer and decomposer (1)
Arrange the following in a correct sequence and form a food chain
Rabbit → Carrot → Eagle → Snake
Arrange the following in a correct sequence and form a food chain
Human → Insect → Algae → Fish
We should reduce the use of the plastic bags, bottles etc. because ______.
Use of several pesticides which results in excessive accumulation of pesticides in rivers of ponds, is a matter of deep concern. Justify this statement.
