Question 67,68,69 form this


67. The correct option is (b). In non-cyclic photophosphorylation, both PS-I and PS-II are involved. In this, water is utilized and so oxygen is also evolved. Both NADPH and ATP are produced. But in cyclic photophosphorylation, only PS I is involved. Water is not utilized here and O2 evolution does not occur. Two ATP molecules and no NADPH are produced. So, a common phenomenon to both these processes is formation of ATP.

68. The correct option is (b). With the help of sunlight, the water molecule breaks up into hydrogen and oxygen. This process is called the photolysis of water. A plant that is photosynthesizing plant and is releasing 180 more than the normal form must have been supplied with H2O with 180.

69. The correct option is (c).
The growing algae in tanks trap maximum solar energy. The red and blue light of the spectrum are most effective in the process of photosynthesis in growing algae. 

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H20 with 18 O
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