Grasses have anadaptive mechanism to compensate photorespiratory lossesName and describe the mechanism.

Explanation

Dicarboxylic acid pathway is an adaptive mechanism is grasses to compensate photorespiratory loss, `C_(4)` pathway is completed in two phasese , first phase takes palce in stroma of mesophyll cells, where the `C_(2)` acceptor molecule is 3 - Carbon compound, Phospho Enol Pyruvate (PEP) to form 4 - carbon Oxalo Oxalo Acetic Acid (OAA) . The first produce is a 4 -carbon and so it is named as `C_(4)` cycle . Oxalo acetic acids is dicarboxylic acid and hence this cycle is also know as dicarboyxlic acid pathway. Carbon dioxide fixation takes places in two place one in mesophyll and another in bundle sheath cell (dicarboxylation pathway) . It is the adaption of tropical and sub tropical plants growing in warm annd dry conditions . Fixation of `CO_(2)` with minimal loss is due to absence of photorespiration . `C_(4)` plants require 5 ATP and 2NADPH + `H^(+)` to fix one molecule of `CO_(2)` .

Oxaloacetic aicd (OAA) is converted into malic acid undergoes decarboyxlationn annd produces a 3 carbon compound Pyruvic cycle and finally sugar is released to the pholen. Pyruvic acid is transported to the mesophyll cells.