Advertisements
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
List two biotic components of a biosphere.
We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.
Which of the following belong to the same trophic level?
Goat ; Spider ; Plants ; Hawk ; Rat
Can the organisms of any trophic level be removed without causing any damage to the ecosystem? Will the impact of removing all the organisms in a trophic level be different for different trophic levels?
Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain?
In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?
Why are there rarely more than five links (or five organisms) in a food chain?
What provides the energy which then flows through a food chain?
(a) glucose
(b) oxygen
(c) respiration
(d) sunlight
What percentage of sun's energy falling on the leaves of green plants is utilised by the plants in the process of photosynthesis and stored as chemical energy of food?
(a) 99 per cent
(b) 10 per cent
(c) 1 per cent
(d) 20 per cent
Most of the water surface of a lake is covered with algae. This algae is part of the food chain which also includes small fish, bird, larvae and big fish. Which of the following will obtain the maximum energy?
(a) big fish
(b) bird
(c) larvae
(d) small fish
