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Subject :NSO    Class : Class 6

There are many plants growing healthily in a green house. Which of the following factors will affect the amount of oxygen and carbon dioxide in a greenhouse on a sunny day?
(i) Amount of nitrogen gas in the air
(ii) Amount of sunlight received by the plants
(iii) Amount of water vapour in the air
(iv) Number of plants in the greenhouse

A(i) and (iii) only
B(ii), (iii) and (iv) only
C(i), (ii) and (iv) only
DAll of these

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