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Excessive exposure of human to UV-rays r...

Excessive exposure of human to UV-rays results in
(i) damage to immune system, (ii) damage to lungs
(iii) skin cancer, (iv) peptic ulcers

A

(i) and (ii)

B

(ii) and (iv)

C

(i) and (iii)

D

(iii) and (iv)

Text Solution

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The correct Answer is:
C
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LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
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  2. Flow of energy in an ecosystem is always

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  3. Excessive exposure of human to UV-rays results in (i) damage to imm...

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  4. Which of the following gets the minimum energy through the food chain ...

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  5. A food chain comprises of cat, seed-eating bird, plants, and dog. The ...

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  6. An aquatic food chain comprises of the organisms like tadpoles, weeds,...

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  7. Most of the water surface of a lake is covered with algae. This algae ...

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  8. If the energy available at the producer level in a food chain is 150 J...

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  9. If the energy transferred to a tertiary consumer in a food chain is 10...

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  10. In addition to wheat plants, a crop field ecosystem has organisms such...

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

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

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  13. The ten per cent law is associated with

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

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

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

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

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

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

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

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