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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: Flow of energy in a food chain is unidirectional.
List two important roles play in the environment by decomposers.
What is biological magnification?
What are planktons?
What are the various steps of food chain called?
Which organisms belong to third and fourth trophic levels in the food chain comprising the following?
Rats, Plants, Hawk, Snakes
A food chain represents a unidirectional flow of X. What is X?
Write down a food chain with five links in it.
What is a food chain?
In a food chain, the initial organism is usually :
(a) photosynthetic
(b) herbivore
(c) saprophytic
(d) parasitic
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 |
Write the percentage of energy transferred from autotrophs to the next level in a food chain.
In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?
Fill in the following blank with suitable word :
Pesticides enter the food chain at the ...........level
Explain how harmful chemicals enter our bodies.
In a given food chain if the amount of energy at the fourth trophic level is 6 kJ, what will be the energy available at the producer level?
A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in ______.
Which of the following is an autotroph?
Analogy:
Primary Consumer: Goat, Cow:: Secondary Consumer: ______.
Which statement is correct with respect to the food chain?
