Parallel venation occurs in :-

Options

A. Poaceae
B. Solanaceae
C. Malvaceae
D. Fabaceae

Answer

### Step-by-Step Solution:

1. **Understanding Venation**:
- Venation refers to the pattern of veins and veinlets in a leaf. The arrangement can be classified mainly into two types: parallel venation and reticulate venation.

2. **Identifying Parallel Venation**:
- Parallel venation is characterized by veins that run parallel to each other and to the midrib of the leaf. This type of venation is typically found in monocots (monocotyledons).

3. **Identifying Reticulate Venation**:
- In contrast, reticulate venation is a network-like pattern of veins and is commonly found in dicots (dicotyledons).

4. **Analyzing the Options**:
- The question provides several options, and we need to identify which one exhibits parallel venation.
- The first option is "Poaceae," which is the grass family and consists of monocots. Therefore, it exhibits parallel venation.
- The other options include families such as Solanaceae (potato family), Malvaceae (okra family), and Fabaceae (legume family), all of which are dicots and exhibit reticulate venation.

5. **Conclusion**:
- Since only the Poaceae family represents monocots and exhibits parallel venation, the correct answer to the question is option 1: Poaceae.

### Final Answer:
**Parallel venation occurs in: Poaceae (option 1).**