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प्रश्न
Explain why, the flow of energy in the ecosystem is said to be unidirectional.
Give scientific reasons:
In an ecosystem, the energy flow is always unidirectional.
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उत्तर
Energy enters plants from the sun during food production through photosynthesis. This energy is then passed on from one organism to another in a food chain. The energy given out by organisms as heat is lost in the environment and does not return to be used by plants again. This makes the flow of energy in an ecosystem unidirectional. Thus, the flow of energy in an ecosystem is said to be unidirectional because the energy lost as heat from the organisms in a food chain cannot be reused by plants in photosynthesis.
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संबंधित प्रश्न
Give reason to justify the following: The existence of decomposers is essential in a biosphere.
List two biotic components of a biosphere.
Why are green plants called producers?
In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain?
Plants → Sheep → Man
Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following :
Frogs, Plants, Snakes, Hawk, Insects
What is the role of decomposers in the ecosystem?
Write one or two word for the following statement/definition :
Organisms which depend on the producers for food either directly or indirectly
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 following is a food chain that ends with human :
plants → bee → human
How do bees provide food for humans?
Name the process in which a harmful chemical enters the food chain and gets concentrated at each trophic level.
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.
Fill in the following blank with suitable word :
Pesticides enter the food chain at the ...........level
What is ten per cent law? Explain with an example.
What does garbage consist of?
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.
Which other organism you could write in place of bird in the above food chain?
Arrange the following in a correct sequence and form a food chain
Human → Insect → Algae → Fish
What would happen if an organism is removed from the food chain?
Differentiate between herbivores and carnivores.
If a harmful chemical enters a food chain comprising peacocks, plants, rats and snakes, which of these organisms is likely to have the highest concentration of the chemical in its body? Justify your answer. Name the process involved and define it.
