Which of the following have double endosperm?

Options

A. Raphanus
B. Coconut
C. Zea mays
D. Betel nut

Answer

To determine which of the following have double endosperm, we need to understand the concept of endosperm in flowering plants. Here are the steps to arrive at the answer:

### Step-by-Step Solution:

1. **Understand Endosperm**: Endosperm is a tissue that provides nutrition to the developing embryo in seeds. There are two types of endosperm: nuclear and cellular.

2. **Nuclear Endosperm**: In nuclear endosperm, after nuclear divisions, the cell wall does not form immediately. This results in a free nuclear division, where multiple nuclei exist in a common cytoplasm without being separated by cell walls.

3. **Cellular Endosperm**: In cellular endosperm, after each nuclear division, a cell wall forms, creating individual cells. This type of endosperm is more structured and is what we typically think of when we consider endosperm in seeds.

4. **Example of Double Endosperm**: The coconut is a prime example of a plant that has double endosperm. It contains both nuclear endosperm (the coconut water) and cellular endosperm (the white kernel).

5. **Conclusion**: Therefore, the answer to the question is that the coconut has double endosperm, consisting of both nuclear and cellular types.

### Final Answer:
Coconut is the plant that has double endosperm.

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