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In an ecosystem : (i) the flow of ener...

In an ecosystem :
(i) the flow of energy is unidirectional
(ii) the flow of materials is unidirectional
(iii) the flow of materials is cyclic
(iv) the flow of energy is cyclic.

A

(i) and (ii)

B

(ii) and (iii)

C

(i) and (iv)

D

(i) and (iii)

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The correct Answer is:
D
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LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
  1. In addition to wheat plants, a crop field ecosystem has organisms such...

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  2. Which of the following is the best method to dispose of biological was...

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  3. In an ecosystem : (i) the flow of energy is unidirectional (ii) ...

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  4. The ten per cent law is associated with

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  5. The harmful chemical which is accumulating in human beings through foo...

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  6. O(2) is converted into O(3) by the action of :

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  7. Which of the following cannot be added in a composting pit to prepare ...

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  8. The gas A is used by most of the animals to obtain energy from food by...

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  9. The surface of water in a lake appears green due to a layer of tiny fr...

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  10. A forest ecosystem having a lot of green plants has some foxes, lions ...

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  11. A food chain consists of fish, larvae , phytoplanktons and birds. The ...

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  12. Why are some substances biodegradable and some non-biodegradable?

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  13. Give any two ways in which biodegradable substances would affect the e...

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  14. Give any two ways in which non-biodegradable substances would affect t...

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  15. What are tropic levels ? Give an example of a food chain and state the...

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  16. What is the role of decomposers in the ecosystem?

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  17. What is ozone and how does it affect any ecosystem?

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  18. How can you help in reducing the problem of waste disposal? Give any t...

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  19. Which of the following groups contain only biodegradable items?

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  20. Which of the following constitute a food-chain?

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