In grasses the arrangement of leaves is

Options

A. Spiral and pentastichous
B. Alternate and distichous
C. Opposite and decussate
D. Opposite and superposed.

Answer

To answer the question regarding the arrangement of leaves in grasses, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the arrangement of leaves specifically in grasses, which belong to the family Poaceae.

2. **Reviewing Leaf Arrangements**: There are several types of leaf arrangements in plants:
- **Spiral and Pentastichous**: Leaves are arranged in a spiral pattern around the stem.
- **Alternate and Distichous**: Leaves are arranged alternately on either side of the stem in two vertical rows.
- **Opposite and Decussate**: Leaves are arranged in pairs on opposite sides of the stem, with each pair rotated 90 degrees from the previous one.
- **Opposite and Superposed**: Leaves are arranged in pairs on opposite sides of the stem, directly above one another.

3. **Identifying the Correct Arrangement in Grasses**: In grasses, the leaves are typically arranged in an **alternate** pattern, meaning they do not grow directly opposite each other on the stem. Additionally, they are often described as **distichous**, which indicates that they are arranged in two vertical rows.

4. **Evaluating the Options**:
- **Option 1 (Spiral and Pentastichous)**: Incorrect; this arrangement is not characteristic of grasses.
- **Option 2 (Alternate and Distichous)**: Correct; this is the typical arrangement of leaves in grasses.
- **Option 3 (Opposite and Decussate)**: Incorrect; this arrangement is found in some flowering plants but not in grasses.
- **Option 4 (Opposite and Superposed)**: Incorrect; this arrangement is also not typical for grasses.

5. **Conclusion**: Based on the analysis, the correct answer to the arrangement of leaves in grasses is **Option 2: Alternate and Distichous**.