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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.
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संबंधित प्रश्न
Give reason to justify the following: The existence of decomposers is essential in a biosphere.
Why are green plants called producers?
The first trophic level in a food chain is always a green plant. Why ?
What will happen if we kill all the organisms in one trophic level?
Which of the following belong to the same trophic level?
Goat ; Spider ; Plants ; Hawk ; Rat
What is the role of decomposers in the ecosystem?
At which trophic level a person is feeding when he is eating apple.
Construct a long 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 |
If a grasshopper is eaten by a frog, then the energy transfer will be from ______.
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Which organism in the above food chain is a (1) primary consumer, and (2) tertiary consumer?
What would happen to the number of grass plants and foxes if the number of rabbits decreased?
Name the process in which a harmful chemical enters the food chain and gets concentrated at each trophic level.
Why are there rarely more than five links (or five organisms) in a food chain?
Fill in the following blank with suitable word :
Plants → Antelope → ............
Explain why, a food chain usually cannot have more than three or four steps.
The surface of water in a lake appears green due to a layer of tiny free-floating organisms X on its surface. The lake water also contains organisms like water beetle, fish and tadpole. The sun shines over the lake water and provides energy for the functioning of this lake ecosystem.
(a) What could organisms X be?
(b) Write a food chain comprising of all the four organisms mentioned.
(c) What is the general name of the food chains like the one written above?
(d) Name (i) secondary consumer (ii) producer (iii) tertiary consumer, and (iv) primary consumer, in the above food chain.
(e) If the tertiary consumer gets 0.2 J of energy from the secondary consumer, then how much energy was radiated by the sun to the producer?
In an ecosystem, herbivores represent ______.
Natural agents like ______ are the decomposition factors breaking complex forms into simpler units.
In a food chain grasshopper gets energy by eating frog.
