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प्रश्न
What is meant by bioconcentration of pesticides
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उत्तर
The increase in the concentration of harmful chemical substances, such as pesticides, in the body of living organisms at each trophic level of a food chain is called bioconcentration of pesticides.
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संबंधित प्रश्न
"Energy flow in a food chain is unidirectional" Justify this statement.
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
The following statement is true or false :
In biology, human beings are called producers.
Fill in the following blank with suitable word :
In nature, all green plants are............ whereas animals are consumers.
At which trophic level a person is feeding when he is eating roasted chicken.
Construct a short foodchain, ending with man.
Write a common food chain of a pond ecosystem having four links.
Which of the following statement is incorrect?
One of the following is a micro-consumer. This one is :
(a) ant
(b) lice
(c) fungi
(d) mosquito
What would happen to the number of rabbits and grass plants if the number of foxes increased?
Name two predators of snakes in a food web operating in a forest ecosystem.
Explain why, a food chain usually cannot have more than three or four steps.
What provides the energy which then flows through a food chain?
(a) glucose
(b) oxygen
(c) respiration
(d) sunlight
The harmful chemical which is accumulating in human beings through food chain is :
(a) benzenehexachloride
(b) dichlorodiphenyltrichloroethane
(c) chlorofluorocarbon
(d) abscisic acid
A forest ecosystem having a lot of green plants has some foxes, lions and rabbits in it.
(a) Write a food chain comprising all the four organisms mentioned above.
(b) Name (i) one herbivore, and (ii) two carnivores, in this food chain.
(c) Name the link which is a predator as well as a prey.
(d) Name (i) second trophic level, and (ii) third trophic level.
(e) Which link of this food chain can feed on second trophic level as well as third trophic level, independently?
(f) If the sun provides 1000 J of energy to the plants, then how much energy will be transferred to fox through the food chain.
Arrange the following in a correct sequence and form a food chain
Human → Insect → Algae → Fish
______ are organisms that are able to produce their own organic food.
In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
Use of several pesticides which results in excessive accumulation of pesticides in rivers of ponds, is a matter of deep concern. Justify this statement.
