Question

number of ATP required for the fixation of 4co2 in rice and sugercan plant respectively is​

Answer 1

For instance, the C3 pathway requires 18 molecules of ATP for the synthesis of one molecule of glucose, whereas the NADP-ME type C4 pathway used by maize and sugarcane requires 30 molecules of ATP

Answer 2

Answer:

The total number of ATP required for the fixation of 4CO₂ in rice (C₃) and sugarcane(C₄) plant respectively is​ 12 and 20 ATPs.                    

Explanation:

• Plants such as sugarcane, crabgrass, maize etc. of dry tropical and subtropical origin incorporated through the C₄ cycle are called C₄ plants since the first product of photosynthesis is a 4C compound i.e. OAA (oxaloacetic acid).

• For sugar formation, the C₄ plants undergo the C₄ cycle as well as the C₃ cycle.

• So here double fixation of CO₂ occurs.

• Hence the number of ATPs required per CO₂ fixed in C₄ plants is 2.

• Since the C₃ cycle also takes place in C₄ plants, the number of ATPs required per CO₂ fixed is 3.

• Hence for the fixation of 4CO₂, the total number of ATPs required is 5×4= 20 ATP.

• In C₃ plants like rice undergo a C₃ cycle since the first product of photosynthesis is a 3C compound i.e. PGA (Phosphoglyceric acid), and the number of ATPs required per CO₂ fixed is 3. Thus the total number of ATPs required is 3×4=12 ATP

• Therefore the total number of ATP required for the fixation of 4CO₂ in rice (C₃) and sugarcane(C₄) plants respectively is​ 12 and 20 ATPs.

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