Biology - Our Environment

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36. A group of inter-connected food chains is called (NTSE Chhattisgarh, Stage-I, 2015-16)

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37. The human made synthetic chemical used in refrigerator is  (NTSE Rajasthan, Stage-I, 2015-16)

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38. Excessive exposure of human to UV rays result in
(i) Damage to immune system
(ii) Damage to lungs
(iii) Skin cancer
(iv) Peptic ulcers (NTSE Chandigarh, Stage-I, 2015-16)

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39. Which of the following shows a modern technology measure used to preserve and conserve the environment? (NTSE Stage-II, 2010-11)

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40. Figure below shows the position of layer P in the Earth's atmosphere that protects the Earth from over-exposure to harmful ultraviolet radiation. 

photosynthesis

Which of the following chemicals cause the hinning of layer P? (NTSE Stage-II, 2008-09)

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