Question

To perform an experiment to identify the different parts of an embryo of a dicot seed, first of all you require a dicot seed. Select dicot seed from the following group:
A. Wheat, Gram, Maize, Pea, Barley, Groundnut
B. Wheat, Gram and Pea
C. Gram, Pea and Groundnut
D. Maize, Pea and Barley
E. Gram, Maize and Groundnut

Answer 1

Hint: The angiosperms are classified into monocot and dicot plants. Monocots have only one cotyledon or seed leaf inside the seed while dicots have two cotyledons or seed leaves inside the seed.

Complete answer: The dicotyledons or dicots are one of the two groups into which all the flowering plants or angiosperms are classified. There are around 200,000 known species of dicotyledons till date. The name represents one of the typical characteristics of the group, that is the seed has two embryonic leaves or cotyledons.
In dicot seeds, the embryo consists of an embryo axis and two cotyledons. Cotyledons generally have a broad swollen appearance as it acts as a food reserve for the developing embryo. The embryo axis has two ends. The upper end of the embryo axis forms plumule or future shoot and the lower end forms radicle or future root. The whole content of the seed is enclosed within a protective layer called the seed coat. The seed coat is made up of an outer layer known as testa and an inner layer termed as tegmen. Moreover, the seed is attached to the fruit through a scar called hilum.

Among the given examples, gram, pea and groundnut are dicot seeds while others are monocot seeds.

So, the correct answer is option B.

Additional information:
The cotyledon in angiosperms represents an embryonic leaf that is the first leaf (or leaves) to appear when a seed is germinating. Cotyledons perform photosynthesis in the initial stage of germination but are not true leaves because they are present in the seed before it germinates. After complete germination, true leaves are formed. After seed germination, cotyledons may last only in a few days (ephemeral) or last up to a year (persistent).

Note: Seed is the name of a ripened ovule which contains an embryo or miniature plant, adequate reserve food for future development of the embryo and a covering for protection. Although monocot and dicot seeds develop in differing ways, both have seeds with a seed coat, a single embryo, endosperm and cotyledons.