Longest pollen tube is found in :

Options

A. Wheat
B. Maize
C. Barley
D. Rice

Answer

To determine which plant has the longest pollen tube among the options given (wheat, maize, barley, or rice), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of the Pollen Tube**:
- The pollen tube is a structure that grows from the pollen grain after it lands on the stigma of a flower. Its primary function is to deliver male gametes (sperm cells) to the ovary for fertilization.

2. **Identify the Source of the Pollen Tube**:
- The pollen tube is formed from the vegetative cells present in the pollen grain. These cells undergo mitosis and elongate to form the tube.

3. **Research the Length of Pollen Tubes in Different Plants**:
- Various studies and botanical references indicate that different plants have varying lengths of pollen tubes.

4. **Compare the Options**:
- The options provided are wheat, maize, barley, and rice.
- Research indicates that maize (corn) is known to produce one of the longest pollen tubes among flowering plants.

5. **Conclude the Answer**:
- Based on the information gathered, the longest pollen tube is found in maize, which can grow up to approximately 12 inches in length.

### Final Answer:
The longest pollen tube is found in **maize**.