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प्रश्न
With the help of a food chain, explain how biological magnification of harmful chemicals can occur.
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उत्तर
Chemical substances such as pesticides are sprayed over crop plants to protect them from pests and diseases. When herbivorous animals eat plant food, these poisonous chemical pesticides go into their bodies. Man, being an omnivore, eats plant food as well as the meat of herbivores. Thus, the pesticides present in plant food and herbivores get transferred to man's body through food. Pesticides are non-biodegradable chemicals, so they get accumulated at each trophic level. Since humans occupy the top level in any food chain, the maximum amount of harmful chemical pesticides gets accumulated in our bodies, damaging our health gradually.
The following food chain explains how biological magnification of harmful chemicals can occur. Plants→ Herbivore →Man
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संबंधित प्रश्न
Give reason to justify the following: Flow of energy in a food chain is unidirectional.
List two important roles play in the environment by decomposers.
What will happen if we kill all the organisms in one trophic level?
A food chain represents a unidirectional flow of X. What is X?
Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.
What is a trophic level?
At which trophic level a person is feeding when he is eating eggs.
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 |
The following is a food chain that ends with human :
How does this food chain differ form a usual food chain involving human such as : plants → goat → human?
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name one phytoplankton.
If a harmful chemical enters a food chain comprising cat, mice and plants, which one of these organisms is likely to have the maximum concentration of the harmful chemical in its body?
Why are there rarely more than five links (or five organisms) in a food chain?
What is meant by bioconcentration of pesticides
What provides the energy which then flows through a food chain?
(a) glucose
(b) oxygen
(c) respiration
(d) sunlight
A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in ______.
Each level in the food chain is called a ______ level.
In a food chain, the third trophic level is always occupied by
Assertion (A): The energy which passes to the herbivores does not come back to autotrophs.
Reason (R): The flow of energy in a food chain is unidirectional.
If a harmful chemical enters a food chain comprising peacocks, plants, rats and snakes, which of these organisms is likely to have the highest concentration of the chemical in its body? Justify your answer. Name the process involved and define it.
