Understanding Seed Structures
The question asks about a seed with a thick fibrous outer covering. Among the provided options, the correct answer is coconut.
Characteristics of Coconut Seeds
- Fibrous Outer Layer:
The coconut seed is encased in a thick, fibrous husk known as the mesocarp. This outer layer is made of coir, which is a natural fiber extracted from the outer husk of coconuts.
- Protection:
This fibrous covering serves a crucial role in protecting the seed inside. It shields the seed from physical damage and environmental conditions, allowing it to survive until it can germinate.
- Water Resistance:
The fibrous layer is also somewhat water-resistant, enabling the seed to float in water and travel long distances. This floating ability helps in the dispersal of coconut seeds across oceans to new locations.
Comparison with Other Options
- Lime Seed:
Lime seeds have a smooth outer covering without the fibrous texture seen in coconuts. They do not serve the same protective function.
- Papaya Seed:
Papaya seeds are small and black with a hard seed coat but lack the thick, fibrous outer covering characteristic of coconuts.
- Neem Seed:
Neem seeds have a hard shell but are not covered by a fibrous layer. They are different in structure compared to coconut seeds.
Conclusion
In summary, the coconut seed is uniquely identified by its thick fibrous outer covering, making it the correct answer to the question. Its structure not only protects the seed but also aids in its dispersal, showcasing the adaptability and resilience of the coconut.