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51. How is C₄ pathway more energy expensive that C₃ ?

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52. Differentiate between Chlorophyll ‘a’ and Chlorophyll ‘b’ :

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53. Explain the affect of carbon dioxide on photosynthesis.

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Photorespiration	Respiration
1. It is the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water.	1. It is the process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of organic substances.
2. Light and the presence of cholorophyll is required	2. Light and cholorophyll are not required,
3. Carbon dioxide and water is used and oxygen is released	3. Oxygen is used and carbon dioxide and water is formed.
4. Occurs only in plants	4. Occurs in all organisms.
5. Chloroplasts is involved	5. Mitochondria is involved
6. It stores energy	6. It release energy.