How many of the given statements are incorrect ?
I. Connectivity of plasmodesmata is maintained by ER membrane called dictyosome .
II.Totallly buried proteins in membrane are integral protein while partially buried proteins are peripheral proteins.
III. The primary cell wall is capable of growth.
IV. The peroxisome is not included in the endomembrane system.

Options

A. One
B. Two
C. Three
D. Four

Answer

To determine how many of the given statements are incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement I: Connectivity of plasmodesmata is maintained by ER membrane called dictyosome.**
- **Analysis:** This statement is incorrect. Plasmodesmata are channels that connect plant cells and allow for communication and transport of substances. They are formed from the endoplasmic reticulum (ER) but are not maintained by a structure called dictyosome. Dictyosomes are actually part of the Golgi apparatus and do not play a role in the connectivity of plasmodesmata.
- **Conclusion:** Statement I is incorrect.

2. **Statement II: Totally buried proteins in membrane are integral proteins while partially buried proteins are peripheral proteins.**
- **Analysis:** This statement is also incorrect. Integral proteins are indeed those that are embedded within the membrane, but peripheral proteins are not "partially buried." Instead, peripheral proteins are located on the surface of the membrane and do not penetrate it. Therefore, the description of peripheral proteins as partially buried is misleading.
- **Conclusion:** Statement II is incorrect.

3. **Statement III: The primary cell wall is capable of growth.**
- **Analysis:** This statement is correct. The primary cell wall in plants is flexible and can expand as the cell grows. It is composed of cellulose and other polysaccharides that allow for growth and expansion.
- **Conclusion:** Statement III is correct.

4. **Statement IV: The peroxisome is not included in the endomembrane system.**
- **Analysis:** This statement is correct. Peroxisomes are organelles that contain enzymes for various metabolic reactions, including the breakdown of fatty acids and detoxification of hydrogen peroxide. They are not part of the endomembrane system, which includes structures like the endoplasmic reticulum, Golgi apparatus, and vesicles.
- **Conclusion:** Statement IV is correct.

### Final Count of Incorrect Statements:
- Incorrect Statements: I and II
- Total Incorrect Statements: 2

### Answer:
The number of incorrect statements is **2**.

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