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प्रश्न
With the help of a flow chart, show the phenomenon of biomagnifications of DDT in an aquatic food chain.
उत्तर
The increased concentration of toxic materials at each trophic level of a food chain is called biomagnification or biological concentration.
When the agricultural fields are sprayed with dichlorodiphenyltrichloroethane (DDT), it is carried into water bodies with low concentration. It gets accumulated by the zooplankton and its concentration goes on increasing at each trophic level in a food chain—from small fish to large fish and birds.
संबंधित प्रश्न
Distinguish between Litter and detritus.
Energy flow in ecosystem is_____
(A) reverse
(B) unidirectional
(C) bidirectional
(D) multidirectional
Correct and rewrite the following statement and justify your correction.
Plants in an ecosystem are called primary consumers.
State the importance of green plants in an ecosystem.
Energy enters in a food chain through
Answer the following question:
What do detritus food chains begin with?
Give the scientific term for the following:
Type of water absorption by roots where metabolic energy is required.
With the help of a diagram explain how wind energy is converted into electric energy.
Consider the amount of organic matter at the different trophic levels in an ecosystem given below:
| Trophic Level | Amount of organic matter (in Kg) |
| Tertiary consumers | 250 |
| Primary consumers | 150 |
| Primary producers | 100 |
| Secondary Consumers | 200 |
On the basis of the data provided above, construct an ecological pyramid. Comment upon its nature giving at least one example of the type of organism occupying each of the above mentioned trophic levels.
Trophic level of food chain having greatest amount of energy is ______.
