In stem cork cambium originates from some

Options

A. outer cells of cortex
B. fascicular and interfascicular cambium
C. inner cell of cortex
D. endodermis

Answer

To solve the question "In stem, cork cambium originates from some," we need to analyze the options provided and understand the origin of cork cambium in plants, particularly in dicots.

### Step-by-Step Solution:

1. **Understanding Cork Cambium**: Cork cambium, also known as phellogen, is a type of meristematic tissue that plays a crucial role in secondary growth in plants. It is responsible for the production of cork (phellem) and secondary cortex (phelloderm).

2. **Identifying the Context**: Cork cambium is primarily found in dicotyledonous plants, as secondary growth occurs in these plants. Monocots generally do not exhibit secondary growth.

3. **Analyzing the Options**:
- **Option 1: Outer cells of cortex**: This is the correct answer. The cork cambium originates from the outer cells of the cortex, which differentiate to form the cork cambium during secondary growth.
- **Option 2: Fascicular and interfascicular cambium**: This option is incorrect as these cambium types are involved in vascular tissue formation, not cork cambium.
- **Option 3: Inner cell of cortex**: This is also incorrect. The inner cells of the cortex do not form cork cambium; they contribute to the secondary cortex.
- **Option 4: Endodermis**: This option is incorrect as well. The endodermis does not give rise to cork cambium.

4. **Conclusion**: Based on the analysis, the cork cambium originates from the outer cells of the cortex. Therefore, the correct answer is **Option 1: Outer cells of cortex**.

### Final Answer:
The stem cork cambium originates from the **outer cells of cortex**.