Unlike primary growth, secondary growth in both roots and stems :

Options

A. is indeterminate
B. produces xylem and phloem
C. involves vascular and cork cambiums
D. result in a rapid increase in root or stem length

Explanation

**Step-by-Step Solution:**

1. **Understanding Primary vs. Secondary Growth:**
- Primary growth refers to the elongation of plant parts, resulting in an increase in length. This occurs at the apical meristems located at the tips of roots and stems.
- Secondary growth, on the other hand, refers to the increase in girth (thickness) of stems and roots. This is primarily due to the activity of lateral meristems.

2. **Identifying the Meristems Involved in Secondary Growth:**
- The main lateral meristems responsible for secondary growth are the vascular cambium and cork cambium.
- The vascular cambium is a layer of meristematic tissue located between the xylem and phloem. It divides to produce secondary xylem (wood) and secondary phloem.
- The cork cambium produces cork cells that replace the epidermis, providing protection and reducing water loss.

3. **Analyzing the Options Given in the Question:**
- Option 1: "Is indeterminate" - This is incorrect because both primary and secondary growth are indeterminate.
- Option 2: "Produces xylem and phloem" - This is also incorrect since both types of growth produce these tissues.
- Option 3: "Results in rapid increase in root or stem length" - This is incorrect as secondary growth increases girth, not length.
- Option 4: "Involves vascular and cork cambium" - This is the correct option as it accurately describes the process of secondary growth.

4. **Conclusion:**
- Therefore, the correct answer to the question is that secondary growth in both roots and stems involves vascular and cork cambium.

**Final Answer:**
Unlike primary growth, secondary growth in both roots and stems involves vascular and cork cambium.

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