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प्रश्न
DDT was sprayed in a lake to regulate breeding of mosquitoes. How would it affect the trophic levels in the following food chain associated with a lake? Justify your answer.
उत्तर
- DDT being a non- biodegradable pesticide will enter the food chain from the first trophic level i.e Plankton.
- Non – biodegradable pesticides accumulate progressively at each trophic level. This phenomenon is known as biological magnification.
- HAWK will have the highest level of pesticide.
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संबंधित प्रश्न
List two biotic components of a biosphere.
Explain how the pesticides enter a food chain and subsequently get into our body.
What are the various steps of food chain called?
Construct a food chain comprising the following :
Snakes, Hawk, Rats, Plants
Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain?
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
Which of the following group of organisms are not constituents of a food chain?
- grass, lion, rabbit, wolf
- plankton, man, fish, grasshopper
- wolf, grass, snake, tiger
- frog, snake, eagle, grass, grasshopper
In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?
A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in ______.
Study the picture given below showing three food chains (a), (b) and (c) and answer the following questions:
- Name the type of ecosystems that exist in food chains (b) and (c).
- The first trophic level in all food chains is producers. Why? What percentage of solar energy do these producers capture for their use?
- Why are the arrows shown in the diagram in one direction only and not vice versa? Justify.
