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  4. 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.

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Q. Given table shows the $CO_{2}$ compensation point and optimum $CO_{2}$ concentration for photosynthesis for $C_{3}$ and $C_{4}$ plants.
Parameters $C_{3}$ Plants $C_{4}$ Plants
$CO_{2}$ compensation point $25-100$ ppm $A$
Optimum $CO_{2}$ concentration $B$ $360$ppm

Select the correct values for $A$ and $B$.

Photosynthesis in Higher Plants

Solution:

$CO_{2}$ compensation point or threshold value is that concentration of $CO_{2}$ at which illuminated plant parts stop absorbing carbon dioxide from their environment. At this value, $CO_{2}$ fixed in photosynthesis is equal to $CO_{2}$ evolved in respiration and photorespiration. The value is $25-100 \,ppm$ in $C_{3}$ plants and $0-10\, ppm$ in $C_{4}$ plants. The reason for low compensation value for $C_{4}$ plants is the greater efficiency of $CO_{2}$-fixation through $PEP$-carboxylase. The optimum $CO_{2}$ concentration for $C_{4}$ plants is $360\, ppm$ and for $C_{3}$ plants, it is $450 \,ppm$.