(a.) In the young dicot stem, cambium present in patches as a single layer between xylem and y.
(b.) Vascular and cork cambium both are form the lateral meristem.
(C.) The medullary cells are derived from the interfascicluar cambium.
In given statements, which of the following are correct ?

Options

A. a and c
B. a and b
C. b and c
D. a, b and c

Answer

To solve the question, we need to analyze the three statements provided about the anatomy of the young dicot stem and determine their correctness.

### Step-by-Step Solution:

1. **Analyzing Statement (a):**
- The statement says that in the young dicot stem, cambium is present in patches as a single layer between xylem and phloem.
- **Explanation:** In a young dicot stem, the cambium is indeed present in a discontinuous form between the xylem and phloem. This is known as intrafascicular cambium, and it is correct to say that it is present in patches before the secondary growth occurs.
- **Conclusion:** This statement is **correct**.

2. **Analyzing Statement (b):**
- The statement claims that both vascular cambium and cork cambium form the lateral meristem.
- **Explanation:** Vascular cambium is responsible for secondary growth and is located between xylem and phloem. Cork cambium (or phellogen) is also a lateral meristem that contributes to the formation of the outer protective layer of the stem. Both are indeed types of lateral meristematic tissues involved in secondary growth.
- **Conclusion:** This statement is **correct**.

3. **Analyzing Statement (c):**
- The statement states that the medullary cells are derived from the interfascicular cambium.
- **Explanation:** Medullary rays are formed from the interfascicular cambium, which is the cambium that develops between the vascular bundles. The medullary cells help in the formation of the interfascicular cambium and contribute to the secondary growth process.
- **Conclusion:** This statement is **correct**.

### Final Conclusion:
All three statements (a, b, and c) are correct regarding the anatomy of the young dicot stem. Therefore, the answer is option D: **All three statements are correct (ABC)**.

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