The Cotyledon is also known as
A. Seed leaves
B. Endosperm
C. Embryo
D. None of the above

Hint: Cotyledon is a significant part of the embryo present inside the seed of a plant. On the germination, the cotyledon apparently becomes the embryonic first leaves of a seedling. The number of cotyledons present is one characteristic used by the botanists to classify the flowering plants, angiosperms.

Step by step answer:The reason why the cotyledons are referred to as the seed leaves is that they act as the leaves of the seed during the germination process. This is the sense that, as the leaves of the plants help to provide food for the plants by the process of photosynthesis, so does the cotyledons help to provide food for the germinating plant. This is only possible because the cotyledons store food necessary during this process.
Therefore, the correct answer is option A.

Additional Information: Endosperm is a tissue produced in the seeds of most of the flowering plants which follows fertilization. Mostly it is triploid in many species. It surrounds the embryo and helps to provide nutrition in the form of starch.
Embryo is sometimes called the seed embryo. It is the part of a seed or bud that contains the earliest forms of a plant's roots, stem and also leaves. The embryo develops after a fertilized adult plant flowers and it is generally contained within a seed or a bud.

Note: Cotyledons contain stored food for the seed. As these reserves are used up, cotyledons can turn the green and begin the process of photosynthesis or may wither as the first true leaves take over the food production for the seedling.