Many pollen tubes are formed during the germination of pollen grains in

Options

A. Solanum
B. Salvia
C. Cucurbita
D. Capsella

Answer

**Step-by-Step Solution:**

1. **Understanding Pollen Grain Structure**: Pollen grains consist of two main cells: the vegetative cell (also known as the tube cell) and the generative cell. The vegetative cell is responsible for forming the pollen tube, while the generative cell divides to form two male gametes.

2. **Pollen Tube Formation**: When pollen grains land on a compatible stigma, the vegetative cell develops into a pollen tube. This tube grows down through the style towards the ovule, allowing the male gametes to reach the egg cell for fertilization.

3. **Types of Plants Based on Pollen Tube Formation**:
- **Monocephalus Plants**: These plants produce only one pollen tube from each pollen grain. An example is the Poaceae family, where the single pollen tube carries both male gametes to the egg.
- **Polycephalus Plants**: In contrast, polycephalus plants can produce multiple pollen tubes from a single pollen grain. These tubes may also branch out.

4. **Identifying Polycephalus Plants**: Polycephalus plants are primarily found in the families Malvaceae and Cucurbitaceae.

5. **Conclusion**: Among the examples given (Solanum, Salvia, Cucurbita, or Capsula), the plant that forms many pollen tubes during the germination of pollen grains is **Cucurbita**, which belongs to the Cucurbitaceae family.

**Final Answer**: Many pollen tubes are formed during the germination of pollen grains in **Cucurbita**.

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