What is not true of sphaerosomes

Options

A. Single membrane covering
B. Connected with fats
C. Arise from endoplasmic reticulum
D. Involved in photorespiration

Answer

To determine what is not true of sphaerosomes, we will analyze the characteristics and functions of these organelles based on the information provided.

### Step-by-Step Solution:

1. **Definition of Sphaerosomes**: Sphaerosomes are single membrane-bound organelles found in plant cells. They are primarily involved in the storage and synthesis of fats.

2. **Structure**: Sphaerosomes are spherical in shape, with a diameter of approximately 0.5 to 1 mm. This characteristic is true and does not contradict any known facts about them.

3. **Origin**: Sphaerosomes arise from the endoplasmic reticulum (ER). This is a true statement, as they are derived from the membranes of the ER.

4. **Contents**: These organelles contain granular contents that are rich in lipids, along with some proteins. This is also a true statement, as the main function of sphaerosomes is related to lipid storage.

5. **Function**: The key function of sphaerosomes is the storage and synthesis of fats. However, it is important to note that they are **not involved in photorespiration**. This is the statement that is not true regarding sphaerosomes.

6. **Conclusion**: Based on the analysis, the statement "involved in photorespiration" is not true of sphaerosomes. They do not participate in photorespiration processes.

### Final Answer:
The statement that is not true of sphaerosomes is: **"involved in photorespiration."**

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