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प्रश्न
Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain?
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उत्तर
If all the lions are removed from the above food chain, the population of deer will increase greatly, as there will be no lion to consume them as food. Also, the density of grass will decrease as the high population of deer will lead to excessive grazing of grass.
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संबंधित प्रश्न
State with reason any two possible consequences of elimination of decomposers from the Earth.
List two important roles play in the environment by decomposers.
The following statement is true or false :
In biology, human beings are called producers.
Write down a food chain with five links in it.
Write one or two word for the following statement/definition :
Each level of food chain where transfer of energy takes place
Give one example of a simple food chain.
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
What could be X?
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name the organism which Y could be.
What would happen to the number of grass plants and foxes if the number of rabbits increased?
Will the levels of biological magnification be different at different levels of the ecosystem?
With the help of a food chain, explain how biological magnification of harmful chemicals can occur.
What provides the energy which then flows through a food chain?
(a) glucose
(b) oxygen
(c) respiration
(d) sunlight
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
| Human body is made up of five important components, of which water is the main component. Food, as well as potable water, are essential for every human being. The food is obtained from plants through agriculture. Pesticides are being used extensively for a high yield in the fields. These pesticides are absorbed by the plants from the soil along with water and minerals and from the water bodies these pesticides are taken up by the aquatic animals and plants. As these chemicals are not biodegradables, they get accumulated progressively at each trophic level. The maximum concentration of these chemicals gets accumulated in our bodies and greatly affects the health of our mind and body. |
- Why is the maximum concentration of pesticides found in human beings? (1)
- Give one method which could be applied to reduce our intake of pesticides through food to some extent. (1)
- Various steps in a food chain represent: (1)
- Food web
- Trophic level
- Ecosystem
- Biomagnification
- With regard to various food chains operating in an ecosystem, man is a: (1)
- Consumer
- Producer
- Producer and consumer
- Producer and decomposer
Arrange the following in a correct sequence and form a food chain
Human → Insect → Algae → Fish
Observe the food web and answer the questions given below:
Why do all food chains start with plants?
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
DDT was sprayed in a lake to regulate breeding of mosquitoes. How would it affect the trophic levels in the following food chain associated with a lake? Justify your answer.
