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प्रश्न
What is biological magnification?
What is meant by biological magnification?
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उत्तर १
Biological magnification is defined as the phenomenon of the accumulation or increase in the concentration of some toxic substances at each trophic level.
उत्तर २
A progressive increase in the concentration of non-biodegradable substances in a food chain is called biological magnification.
उत्तर ३
The increase in the concentration of harmful substances, such as pesticides, in the bodies of living organisms at each level of a food chain is called biological magnification.
संबंधित प्रश्न
"Energy flow in a food chain is unidirectional" Justify this statement.
What are planktons?
Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.
What is the difference between the food habits of organisms belonging to the first and the third trophic levels? Give one example each of the organisms belonging to these two trophic levels.
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
The sea water contains water beetles, tadpole, fish and weeds.
Which organisms are (i) predators, and (ii) prey?
Give one example of a food chain having four organisms. Below each organism write the three appropriate terms from the part (a) above which you think it represents.
Write the percentage of energy transferred from autotrophs to the next level in a food chain.
In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?
Consider the following food chain
(i) Plants → Mice → Snakes → Hawks
(ii) Plants → Mice →Hawks
If energy available at the producer level in both the food chains is 100 J, in which case will hawks get more energy as food and by how much? Justify your answer.:
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
Give some examples for Biodegradable and Non-biodegradable waste.
| S. No. | Biodegradable waste | Non-biodegradable waste |
| 1. | Food Waste | Plastic Bottles |
| 2. | ||
| 3. | ||
| 4. | ||
| 5. |
Food chains are very important for the survival of most species.
If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?
The food chain begins with the energy given by the ______.
Define – Heterotrophs.
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
Which 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
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.
