The edosperm is completely consumed by the developing embryo in the seeds of :

Options

A. Maize and rice
B. Rice and castor
C. Castor and maize
D. Pea and beans

Answer

To solve the question regarding which seeds have their endosperm completely consumed by the developing embryo, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Seed Structure**:
- Seeds can be classified into two categories based on the presence of endosperm: albuminous seeds (which contain endosperm) and non-albuminous seeds (which do not).

2. **Definition of Endosperm**:
- The endosperm is a tissue that provides nourishment to the developing embryo within the seed. In some seeds, this tissue is completely consumed during the development of the embryo.

3. **Identifying Non-albuminous Seeds**:
- Non-albuminous seeds are those where the endosperm is fully utilized by the embryo. Examples of non-albuminous seeds include pea, groundnut, and beans.

4. **Identifying Albuminous Seeds**:
- Albuminous seeds retain some endosperm even after the embryo has developed. Examples include maize, rice, barley, and castor.

5. **Analyzing the Options**:
- A. Maize and rice: Both are albuminous seeds.
- B. Rice and castor: Both are albuminous seeds.
- C. Castor and maize: Both are albuminous seeds.
- D. Pea and beans: Both are non-albuminous seeds.

6. **Conclusion**:
- The only option where the endosperm is completely consumed by the developing embryo is option D: pea and beans.

### Final Answer:
The endosperm is completely consumed by the developing embryo in the seeds of **D. pea and beans**.