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Give comparison between the following: - C3 and C4 pathways - CBSE (Science) Class 11 - Biology

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Question

Give comparison between the following: - C3 and C4 pathways

Solution

  C3 pathways   C4 pathways
1 Ribulose biphosphate is the first accepter of CO2 1 Phosphoenol pyruvate is the first accetor of CO2, while ribulose biphosphate is second acceptor
2 Phosphoglyceric acid is the first product. 2 Oxaloacetic acid is the first product.
3 The plants operate only Calvin cycle 3 Plants operate a dicarboxylic acid cycle in addition to Calvin cycle.
4 CO2 compensation point is 25 - 100 ppm. 4 CO2 compensation point is 0 - 10 ppm 
5 Mesophy II cells perform complete photosynthesis. 5 Mesophy II cells perform only initial fixation.
6 The rate of carbon assimilation is slow 6 The rate of carbon assimilation is quite rapid
7 The plant are unable to perform photosynthesis at very low CO2 concentration (say 10 - 50 ppm) 7 Photosynthesis continues even at very low CO2 concentration of 10 - 50 ppm
8 The cycle operate in all plants 8 The cycle is found only in some plants like maize, sugarcane etc.
9 Fixation of one molecule of COuses 3 ATP and 2NADPH 9 Fixation of one molecule of COrequired 5 ATP and 2NADPH
       
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APPEARS IN

 NCERT Solution for Biology Textbook for Class 11 (2018 to Current)
Chapter 13: Photosynthesis in Higher Plants
Q: 9.1 | Page no. 225

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Solution Give comparison between the following: - C3 and C4 pathways Concept: The C4 Pathway.
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