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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.
In a food chain of frog, grass, insect and snake, assign trophic level to frog.
What are planktons?
Write down a food chain with five links in it.
At which trophic level a person is feeding when he is eating roasted chicken.
In a food chain, the third trophic level is always occupied by :
(a) carnivores
(b) herbivores
(c) decomposers
(d) producers
Organisms which synthesise carbohydrates from inorganic compounds by using radiant energy are called ______.
One of the following is not a consumer. This one is :
(a) giraffe
(b) antelope
(c) algae
(d) alligator
The sea water contains water beetles, tadpole, fish and weeds.
Which organism is a secondary consumer?
The following is a food chain that ends with human :
Do you think that the food chain given in this question can really be regarded as a food chain? Explain your answer.
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name two zooplanktons.
What would happen to the number of rabbits and grass plants if the number of foxes increased?
What would happen to the number of grass plants and foxes if the number of rabbits decreased?
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?
Explain how harmful chemicals enter our bodies.
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.
In an ecosystem, herbivores represent ______.
Observe the food web and answer the questions given below:
Why do all food chains start with plants?
In the following food chain, vertical arrows indicate the energy lost to the environment and horizontal arrows indicate energy transferred to the next trophic level. Which one of the three vertical arrows (A, C and E) and which one of the two horizontal arrows (B and D) will represent more energy transfer? Give reason for your answer.
A food chain in a forest ecosystem
Which statement is correct with respect to the food chain?
