Fascicular, interfascicular and extrastellar cambium together constitute:

Options

A. ground meristem
B. apical meristerm
C. intercalary meristem
D. lateral meristem

Answer

**Step-by-Step Solution:**

1. **Understanding the Types of Cambium:**
- There are three types of cambium mentioned: fascicular cambium, interfascicular cambium, and extrastellar cambium.
- These types of cambium are involved in the growth and development of vascular tissues in plants.

2. **Defining Meristem:**
- Meristematic tissues are regions in plants where active cell division occurs, leading to growth.
- There are different types of meristems, each responsible for different growth patterns in plants.

3. **Analyzing the Options:**
- **Option 1: Ground Meristem** - This type of meristem forms the ground tissue of the plant, which includes parenchyma, collenchyma, and sclerenchyma. This does not include cambium, so it is not the correct answer.
- **Option 2: Apical Meristem** - This is found at the tips of roots and shoots and is responsible for primary growth. Cambium is not located at these tips, so this option is also incorrect.
- **Option 3: Intercalary Meristem** - This type is found at the base of nodes and leaf blades and contributes to the elongation of stems. Cambium is not associated with this type, so this option is not correct either.
- **Option 4: Lateral Meristem** - This type of meristem is responsible for secondary growth, which involves the widening of the plant. It includes cambium, which is responsible for the formation of secondary vascular tissues.

4. **Conclusion:**
- Since fascicular, interfascicular, and extrastellar cambium are all involved in secondary growth, they collectively constitute the lateral meristem.
- Therefore, the correct answer is **Option 4: Lateral Meristem**.