It is an example of pinnate type venation of leaf blade

Options

A. Cosmos
B. Castor
C. Tapioica
D. Semul.

Answer

### Step-by-Step Solution:

1. **Understanding Venation**:
- Venation refers to the arrangement of veins in a leaf. It is important to identify the type of venation when categorizing leaves.

2. **Types of Leaves**:
- Leaves can be classified into two main types based on their structure:
- **Simple Leaves**: These leaves have a single, undivided blade.
- **Compound Leaves**: These leaves are divided into multiple leaflets.

3. **Categories of Compound Leaves**:
- Compound leaves can be further divided into two categories:
- **Pinnately Compound Leaves**: These leaves have a single main vein (rachis) with smaller leaflets arranged on either side.
- **Palmately Compound Leaves**: These leaves have multiple main veins that spread out from a single point.

4. **Identifying Pinnate Venation**:
- In pinnate venation, there is only one principal vein from which smaller veins branch out. This is a key characteristic to identify.

5. **Example of Pinnate Venation**:
- An example of a plant with pinnate venation is **Cosmos**. This plant exhibits the typical structure of a pinnately compound leaf.

6. **Conclusion**:
- Therefore, the answer to the question "It is an example of pinnate type venation of leaf blade" is **Cosmos**.