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प्रश्न
What is ten per cent law? Explain with an example.
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उत्तर
According to the 10 per cent law, only 10 per cent of the energy entering a particular trophic level of organisms is available for transfer to the next higher trophic level.
In the following food chain, only 10 per cent of energy is transferred to the next trophic level. The flow of energy is shown below.
Plants → Grasshopper → Frog → Snake → Hawk
100,000J 10,000J 1,000J 100J 10J
When the energy available at the producer level is 100,000 J, only 10 J of energy is available to the hawk.
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संबंधित प्रश्न
In a food chain of frog, grass, insect and snake, assign trophic level to frog.
Why are green plants called producers?
The following statement is true or false :
In biology, human beings are called producers.
Name one decomposer.
Give an example of a four step food chain operating in grassland. Name the secondary consumer in this food chain
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 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 :
plants → bee → human
How do bees provide food for humans?
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name two zooplanktons.
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?
Match the terms given in column I with the terms given in column II and column III having the same meaning :
| Column I | Column II | Column III |
| (1) Secondary consumer | Herbivore | 1st trophic level |
| (2) Primary consume | Autotroph | 3rd trophic level |
| (3) Producer | Carnivore | 4th trophic level |
| (4) Tertiary consumer | Large carnivore | 2nd trophic level |
Name the process in which a harmful chemical enters the food chain and gets concentrated at each trophic level.
What is meant by bioconcentration of pesticides
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
A food chain consists of fish, larvae, phytoplanktons and birds. The level of pesticides in water in which the fish, larvae and phytoplanktons live is quite high.
(a) In which organisms the pesticides enter from the polluted water? What is this level of organisms known as?
What are decomposers? What will be the consequence if the decomposers are completely eradicated from an ecosystem? Give justification in support of your answer.
Bacteria and fungi are called decomposers.
Arrange the following in a correct sequence and form a food chain
Rabbit → Carrot → Eagle → Snake
If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be ______.
Which group of organisms are not constituents of a food chain?
- Grass, lion, rabbit, wolf
- Plankton, man, fish, grasshopper
- Wolf, grass, snake, tiger
- Frog, snake, eagle, grass, grasshopper
