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प्रश्न
Which common pesticide has accumulated in human body in considerable amounts?
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उत्तर
The common pesticide that has accumulated in the human body in considerable amounts is DDT.
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संबंधित प्रश्न
Which of the following constitute a food-chain?
What will happen if we kill all the organisms in one trophic level?
What is biological magnification?
In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain?
Plants → Sheep → Man
What name has been given to those organisms which break down the complex organic compounds present in dead animals and plants?
Which category of organisms forms the starting point of a food chain?
What will happen if we kill all the organisms in one trophic level?
Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain?
At which trophic level a person is feeding when he is eating roasted chicken.
Give one example of a simple food chain.
Which of the following are decomposers of dead organisms?
| Bacteria | Fungi | Viruses |
| (a) no | yes | yes |
| (b) yes | no | yes |
| (c) yes | yes | no |
| (d) yes | yes | yes |
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name two zooplanktons.
Explain why, the flow of energy in the ecosystem is said to be unidirectional.
In the food chain given below, if the amount of energy available at fourth trophic level is 5 kJ, what was the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
(a) 500 kJ
(b) 50 kJ
(c) 5000 kJ
(d) 5 kJ
Which of the following gets the minimum energy through the food chain in an ecosystem?
(a) carnivore
(b) large carnivore
(c) producer
(d) herbivore
Natural agents like ______ are the decomposition factors breaking complex forms into simpler units.
______ obtained energy from the chemical breakdown of dead organisms.
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
Which statement is correct with respect to the food chain?
Use of several pesticides which results in excessive accumulation of pesticides in rivers of ponds, is a matter of deep concern. Justify this statement.
