Which of the following is not a seed surface fiber

Options

A. Kapok
B. Silk cotton
C. Cotton
D. Dhaincha

Answer

To determine which of the following options is not a seed surface fiber, we need to analyze each option provided:

1. **Kapok**: Kapok is a fiber obtained from the seed pods of the kapok tree (Ceiba pentandra). It is known for its buoyancy and is commonly used in pillows and life jackets. Therefore, kapok is a seed surface fiber.

2. **Silk Cotton**: Silk cotton, also known as red silk cotton, is derived from the seed fibers of the tree species Salmalia malabarica. This fiber is also used in various applications, including textiles. Hence, silk cotton is also a seed surface fiber.

3. **Cotton**: Cotton is a well-known fiber obtained from the seed bolls of the cotton plant (Gossypium species). It is one of the most widely used fibers in the textile industry. Thus, cotton is a seed surface fiber.

4. **Daincha**: Daincha, scientifically known as Sesbania bispinosa, is a leguminous plant. The fibers obtained from Daincha are primarily from its stems and not from the seeds. Therefore, Daincha does not produce seed surface fibers.

Based on this analysis, the option that is not a seed surface fiber is **Daincha**.

### Step-by-Step Solution:
1. Identify the options given: Kapok, Silk Cotton, Cotton, Daincha.
2. Analyze each option to determine if it is a seed surface fiber.
- Kapok: Yes, it is a seed surface fiber.
- Silk Cotton: Yes, it is a seed surface fiber.
- Cotton: Yes, it is a seed surface fiber.
- Daincha: No, it is not a seed surface fiber.
3. Conclude that Daincha is the correct answer as it does not belong to the category of seed surface fibers.