Given table shows the CO2 compensation point and optimum CO2 concentration for photosynthesis for C3 and C4 plants. Parameters C3 Plants C4 Plants CO2 compensation point 25-100 ppm A Optimum CO2 concentration B 360ppm Select the correct values for A and B.

Question

Given table shows the CO2 compensation point and optimum CO2 concentration for photosynthesis for C3 and C4 plants. Parameters C3 Plants C4 Plants CO2 compensation point 25-100 ppm A Optimum CO2 concentration B 360ppm Select the correct values for A and B. (A) (A)- 0 - 50 ppm, (B) - 300 ppm (B) (A)- 0 - 10 ppm, (B) - 450 ppm (C) (A) - 100 - 150 ppm, (B) - 250 ppm (D) (A) - 100 - 110 ppm, (B) - 290 ppm

Tardigrade Admin · Accepted Answer

CO2 compensation point or threshold value is that concentration of CO2 at which illuminated plant parts stop absorbing carbon dioxide from their environment. At this value, CO2 fixed in photosynthesis is equal to CO2 evolved in respiration and photorespiration. The value is 25-100 ppm in C3 plants and 0-10 ppm in C4 plants. The reason for low compensation value for C4 plants is the greater efficiency of CO2-fixation through PEP-carboxylase. The optimum CO2 concentration for C4 plants is 360 ppm and for C3 plants, it is 450 ppm.

Parameters	$C_{3}$ Plants	$C_{4}$ Plants
$C O_{2}$ compensation point	$25 - 100$ ppm	$A$
Optimum $C O_{2}$ concentration	$B$	$360$ ppm

Q. Given table shows the CO2​ compensation point and optimum CO2​ concentration for photosynthesis for C3​ and C4​ plants. Parameters C3​ Plants C4​ Plants CO2​ compensation point 25−100 ppm A Optimum CO2​ concentration B 360ppm Select the correct values for A and B.

(A)- 0 - 50 ppm, (B) - 300 ppm

(A)- 0 - 10 ppm, (B) - 450 ppm

(A) - 100 - 150 ppm, (B) - 250 ppm

(A) - 100 - 110 ppm, (B) - 290 ppm