All the following statements are correct except ,

Options

A. Peroxisomes are quite common in the photosynthetic cells . Their number can be 70 - 100 per mesophyll cell, Wherein they interact with mitochondria and chloroplasts to take part in photorespiration
B. Glyoxysomes are numerous in the endosperm of wheat
C. The ER- bound ribosomes synthesis secretory membreane and lysosomal protien
D. Ribosomes when associated with ER are attached with their 60S sub - unit

Answer

To solve the question "All the following statements are correct except," we need to evaluate each statement provided and identify which one is incorrect.

### Step-by-Step Solution:

1. **Evaluate the First Statement:**
- The first statement claims that peroxisomes are present in C2 plants and are responsible for photorespiration.
- Peroxisomes are indeed involved in photorespiration along with mitochondria and chloroplasts.
- In mesophyll cells, the number of peroxisomes is typically between 70 to 100 per cell.
- **Conclusion:** This statement is correct.

2. **Evaluate the Second Statement:**
- The second statement states that glyoxisomes are numerous in the endosperm of wheat.
- Glyoxisomes are involved in the conversion of stored oils into carbohydrates (starch) primarily in seeds that store oils.
- However, the endosperm of wheat primarily stores starch, not oils.
- Therefore, the presence of glyoxisomes in the endosperm of wheat is not significant since they convert oils to starch, and starch is already present.
- **Conclusion:** This statement is incorrect.

3. **Evaluate the Third Statement:**
- The third statement discusses the role of endoplasmic reticulum (ER) bound ribosomes in synthesizing secretory, membrane, and lysosomal proteins.
- Ribosomes attached to the rough endoplasmic reticulum (RER) are responsible for synthesizing these proteins.
- **Conclusion:** This statement is correct.

4. **Evaluate the Fourth Statement:**
- The fourth statement claims that ribosomes associated with the ER are attached with the 60S subunit.
- Ribosomes consist of two subunits: a large subunit (60S) and a small subunit (40S). However, when ribosomes are associated with the ER, they are in the form of the complete ribosome (both subunits together).
- The 60S subunit is part of the ribosome, but it is not accurate to say that ribosomes associated with the ER are only attached with the 60S subunit.
- **Conclusion:** This statement is misleading but not entirely incorrect as it refers to the larger subunit.

### Final Conclusion:
The only statement that is clearly incorrect is the **second statement** regarding glyoxisomes in the endosperm of wheat.

### Answer:
The incorrect statement is: "Glyoxisomes are numerous in endosperm of wheat."

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