Linear growth in the stem of grasses is caused by

Options

A. Intercalary meristems
B. Apical meristems
C. Fascicular cambium
D. both 1 and 2

Answer

### Step-by-Step Solution:

1. **Understanding Linear Growth**: Linear growth refers to the increase in length of the plant stem, which occurs due to the division and elongation of cells.

2. **Role of Meristematic Tissue**: The primary tissue responsible for growth in plants is meristematic tissue. This tissue consists of undifferentiated cells that can divide and contribute to growth.

3. **Types of Meristematic Tissues**: There are two main types of meristematic tissues relevant to stem growth:
- **Apical Meristem**: Located at the tips of roots and shoots, responsible for primary growth (increasing length).
- **Intercalary Meristem**: Found at the base of leaves and internodes, responsible for the elongation of stems.

4. **Growth in Grasses**: In grasses, the linear growth of the stem is primarily due to the activity of the intercalary meristem. This meristem allows for rapid elongation of the internodes, which contributes to the overall height of the grass.

5. **Conclusion**: Therefore, the linear growth in the stem of grasses is caused by the intercalary meristematic tissue.

### Final Answer:
The linear growth in the stem of grasses is caused by **intercalary meristematic tissue**.

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