Endosperm is completely absorbed by the embryo in some plants. Such seeds in which no endosperm left are called as non-endospermous seeds or exalbuminous seeds. . Some examples are: beans, pea, groundnut and green gram. In this type of plant food is stored in dicot seeds.

Answer:

The endosperm is a tissue found in the seeds of angiosperms (flowering plants). It provides nourishment to the developing embryo and serves as a storage tissue for nutrients such as carbohydrates, proteins, and lipids. In some cases, the endosperm is completely consumed by the developing embryo, while in others, it remains as a nutrient source even after germination.

Endosperm consumption in different plants:

In the given options, the correct answer is option 'A', which includes pea, bean, and groundnut. Let's understand why the endosperm is completely consumed in these plants:

Pea:
- Peas belong to the family Fabaceae and have a dicotyledonous seed structure.
- The endosperm in pea seeds is primarily starchy and serves as a food reserve for the developing embryo.
- During seed germination, the cotyledons (seed leaves) of the embryo absorb and utilize the stored nutrients from the endosperm.
- As a result, the endosperm is completely consumed by the developing embryo, and only the cotyledons remain.

Bean:
- Beans also belong to the family Fabaceae and have a dicotyledonous seed structure similar to peas.
- The endosperm in bean seeds is also starchy and acts as a nutrient source for the developing embryo.
- During germination, the cotyledons of the embryo absorb the stored nutrients from the endosperm, leading to its complete consumption.

Groundnut:
- Groundnuts, also known as peanuts, belong to the family Fabaceae and have a unique seed structure.
- The groundnut seed is classified as a legume and has a two-lobed structure.
- The cotyledons of the embryo in groundnut seeds are thick and fleshy, storing nutrients for the developing plant.
- The endosperm in groundnut seeds is thin and gets absorbed by the cotyledons, resulting in its complete consumption.

In contrast, the other options given (b, c, and d) include maize, which has a different seed structure and does not completely consume the endosperm during development. Maize seeds have a large endosperm that remains as a nutrient source even after germination. The embryo in maize seeds utilizes the endosperm for nourishment during germination, but the endosperm is not entirely consumed.

Therefore, the correct answer is option 'A' (Pea, Bean, and Groundnut) as the endosperm is completely consumed by the developing embryo in these plants.