Which of the following organelles takes part in photorespiration?
(a) Glyoxysome
(b) Peroxisome
(c) Dictyosome
(d) ER

Options

A. Glyoxysome
B. Peroxisome
C. Dictyosome
D. ER

Answer

To determine which organelle takes part in photorespiration, let's analyze the options provided:

1. **Understanding Photorespiration**:
- Photorespiration is a process that occurs in plants, particularly in C3 plants, when there is a low concentration of carbon dioxide and a high concentration of oxygen. This process is considered wasteful because it leads to the loss of fixed carbon and energy.

2. **Role of Rubisco**:
- The enzyme Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase) plays a crucial role in photorespiration. It can bind to both carbon dioxide and oxygen, but when it binds to oxygen, it initiates the photorespiration process.

3. **Involvement of Organelles**:
- Photorespiration primarily takes place in three organelles: chloroplasts, peroxisomes, and mitochondria. The process involves the conversion of products formed in chloroplasts, which are then processed in peroxisomes and mitochondria.

4. **Analyzing the Options**:
- (a) Glyoxysome: This organelle is involved in the conversion of fatty acids to carbohydrates in germinating seeds and does not play a role in photorespiration.
- (b) Peroxisome: This organelle is directly involved in the photorespiration process, where it helps in the breakdown of toxic byproducts formed during this process.
- (c) Dictyosome: Also known as the Golgi apparatus, it is involved in the modification and packaging of proteins and lipids, not in photorespiration.
- (d) ER (Endoplasmic Reticulum): This organelle is involved in protein and lipid synthesis but does not participate in photorespiration.

5. **Conclusion**:
- Based on the analysis, the correct answer is **(b) Peroxisome**, as it is the organelle that takes part in photorespiration.