Question

Assertion-
The two cotyledons in the seed are the embryonic leaves.
Reason-
The embryo contains radicle and plumule.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. The assertion is correct but the Reason is incorrect
D. Both Assertion and Reason are incorrect

Answer 1

Hint: A seed is the product of fertilization in flowering plants. The seed germinates on attaining suitable conditions. A seedling is formed during germination. It is the very first structure to appear out of a seed. A seedling consists of cotyledon leaves, radicle, and plumule.

Step by step answer:A seedling is a very initial stage in plant growth and development. A seed consists of cotyledons, radicle, and plumule. Let us discuss each of these components to understand the link they have with each other.
Cotyledon or seed leaf is a thin membrane-like structure enclosed in the seed. The seed germinates when it receives suitable conditions for growth. The initial structure or baby plant that appears from the seed is called a plantlet. The plantlet consists of a short and tender stem, a single thin root, and two or single leaves emerging from the baby stem. The number of cotyledons differentiates one flowering plant from the other. The monocots have a single cotyledon and a dicot have two cotyledons. Cotyledons are indeed the embryonic leaves as they emerge in the embryonic stage.
The radicle is the first root that appears from the seed. It is the very first part of the seedling as it helps in further plant growth. The radicle grows to absorb water and nutrition from the soil so that plantlets can grow and photosynthesize. It is a part of the embryo.
The plumule is the initial tender and thin stem that appears from the seedling. It is the structure that holds the cotyledons on its tip. Longitudinal growth of plumule results in the development of a full plant. It is the photosynthetic region of the plant. It is also an important part of the embryo.
So, both the assertion and reason are correct in their place but the reason does not support an explanation for the assertions.
Therefore, the correct answer is option B.

Note: The seed remains dormant until appropriate conditions arrive that stimulate it to germinate. Until the germination stage, the seed derives its nutrition from the stored food in the embryo. Once the plantlet emerges, the embryo is no more dependent on stored food but starts to photosynthesize its own food.