First slide

Photorespiration

Question

Which statement is wrong about photorespiration ?

Moderate

A

Photorespiration occurs in $C_{3}$ plants and not $C_{4}$ plants
B

There is no synthesis of ATP or NADPH
C

RuBisCO has higher affinity for $C O_{2}$ than $O_{2}$
D

RuBP binds with $O_{2}$ to form two molecules of phosphoglycolate

Solution

RuBP instead of being converted to 2 molecules of PGA binds with $O_{2}$ to form one molecule of phosphoglycerate and phosphoglycolate.
$C_{4}$ plants are special: They have a special type of leaf anatomy, they tolerate higher temperatures, they show a response to high light intensities, they lack a process called photorespiration and have greater productivity of biomass.
In the photorespiratory pathway there is no synthesis of ATP or NADPH. In the photorespiratory pathway, there is neither synthesis of sugars, nor of ATP. Rather it results in the release of ${CO}_{2_{}}$ with the utilisation of ATP.
RuBisCO has a much greater affinity for ${CO}_{2_{}}$ when the ${CO}_{2_{}}$ : $O_{2}$ is nearly equal.

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