Question

Short /Long answer type question.
Enlist the steps involved in $C_4$ pathhway of fixation. Explain how plants overcome the photo-respiratory losses by this mechanism.

Answer 1

$\bullet$ In this pathway, phospho-end pyruvate (PEP) combines with

atmosphere $C{O}_2$ in the pressure of catalyst energy phosphoemol

pyruvate cortroylax (PEP case) to from oxaloectic acid

(OOA)

$\bullet$ $R{x}^2$ occurs in the mesophyll cell og the plants OOA is then

consented into another 4 carbon compound malice acid

which is trans ported into bundle sheath cell from

mesophyll cells.

$\bullet$ In the bundle sheath cells, the malice acid gets decarlroylased

and redoax $C{O}_2$ and pyruric acid

$\bullet$ $C{O}_2$ Liberated is used for calcine cycle in the bundle sheath

cell and pyruric acid transported back to moesphyll cell

which is used for regenerative of $PEP$

$\bullet$ Photorespiratow is regarded as a wasted prows.

$\bullet$ In $C_4$ plants phosphorylation does not occurs This is because they

have a mechanism that increase the concentration of

$C{O}_2$ at the enzyme site

$\bullet$ This results in increasing the interstellar concentration

of $C{O}_2$ which ensures that the Ru Bisco functions

cartorylase and minimize the oxygenase activity