First slide

Photorespiration

Question

How C₄ plants are capable of photosynthesis with no apparent photorespiration?

Easy

A

Because active site of RuBisCO is exposed to more CO₂ and less or no oxygen
B

Because they are adapted to cold and humid environmental conditions
C

Because they lack peroxisomes in their cells
D

Because of absence of ATP and NADPH+H⁺molecules

Solution

Oxygen evolving site is different from the site where RuBisCO is present.
Light reactions, during which oxygen is evolved, operate in chloroplasts of mesophyll cells. RuBisCO is present only in stroma of those chloroplasts which are found in bundle sheath cells where Calvin cycle is operational. Bundle sheath cells have thick walls impervious to gaseous exchange and no intercellular spaces.
Therefore, no exchange of oxygen gas takes place between mesophyll and bundle sheath cells. As a result, C₄ plants are capable of photosynthesis with no apparent photorespiration.

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App