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प्रश्न
Which of the following limits the number of trophic levels in a food chain?
(a) insufficient food supply from producer level
(b) decrease in energy at higher trophic levels
(c) increase in the number of organisms at higher trophic levels
(d) accumulation of harmful chemicals at higher trophic levels
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उत्तर
Decrease in energy at higher trophic levels
According to the 10 per cent law, the amount of energy decreases in each trophic level, and hence the number of trophic levels in a food chain is limited.
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संबंधित प्रश्न
"Energy flow in a food chain is unidirectional" Justify this statement.
Give reason to justify the following: The existence of decomposers is essential in a biosphere.
Which of the following constitute a food-chain?
What is meant by a primary consumer, secondary consumer and a tertiary consumer? Give one example of each.
Write down a food chain in the sea.
At which trophic level a person is feeding when he is eating roasted chicken.
Write a common food chain of a pond ecosystem having four links.
Give two differences between food chain and food web.
In a food chain, the third trophic level is always occupied by :
(a) carnivores
(b) herbivores
(c) decomposers
(d) producers
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
One of the following is not a consumer. This one is :
(a) giraffe
(b) antelope
(c) algae
(d) alligator
In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is :
(a) insect
(b) snake
(c) frog
(d) grass
The sea water contains water beetles, tadpole, fish and weeds.
Write a food chain comprising all the given organisms.
The following statement is true or false :
Only 10 per cent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.
With the help of a food chain, explain how biological magnification of harmful chemicals can occur.
If the energy available at the producer level in a food chain is 150 J, how much energy will be transferred to : tertiary consumer?
(a) 15 J
(b) 10 J
(c) 1.50 J
(d) 0.15 J
| 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
Write the importance of the food chain.
Each level in the food chain is called a ______ level.
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
