Question

In complete photorespiration process, the cell organelles involved are ___________.

• A. Chloroplast, mitochondria
• B. Chloroplast, peroxisome
• C. Ribosome, peroxisome, mitochondria
• D. Chloroplast, peroxisome, mitochondria

Hint:

Photorespiration is often called the C\textsubscript{2} cycle because it involves three different organelles.

Answer 1

The Correct Option is D

Step 1: Understanding photorespiration.
Photorespiration is a light-dependent process that occurs when RuBisCO acts as an oxygenase instead of a carboxylase, leading to the loss of fixed carbon.
Step 2: Organelles involved in the pathway.
Photorespiration is a coordinated process involving three cell organelles.
The reaction begins in the chloroplast, intermediate steps occur in the peroxisome, and final reactions take place in the mitochondria.
Step 3: Analysis of options.
(A) Incorrect — peroxisome is missing.
(B) Incorrect — mitochondria is missing.
(C) Incorrect — ribosome is not involved in photorespiration.
(D) Correct — all three required organelles are included.
Step 4: Conclusion.
Complete photorespiration involves chloroplast, peroxisome, and mitochondria.