MCQ
$C_4$ plants can tolerate saline conditions due to
- ✓Occurrence of organic acids
- BAbsence of photorespiration
- CPresence of $PEP$ synthetase enzyme
- DPresence of $PEP$ carboxylase enzyme
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$R -$ The concentration of $CO_2$ is between $0.03$ and $0.04$ percent. Increase in concentration upto $0.005$ percent can cause an increase in $CO_2$ fixation rates.