Flowering plants, after fertilization, form fruits and seeds. To be clear, the ovule is usually found inside the ovary, it hardens into a seed while the outer ovary forms fleshy or dry fruits.

Now to the right option:

Option A is incorrect; radicle and plumule are roots and stems developed during epigeal and hypogeal germination of seeds, this is clearly not the answer.
Option B is correct; while the ovary matures into fruits, the ovule hardens into seeds inside the fruit.
C is incorrect; the embryo and endosperm are two of the 3 major parts of a seed. A seed cannot be best described as a fraction of its parts.
D is also incorrect; developed ovary form fruits and not seeds.

QUICK ADVICE…

You may please note that

A seed is made up of three major parts, the seed coat, the embryo, and the endosperm.
A mere use of two of these parts is not sufficient to describe it.

You may use the questions and answers session to deal further on this topic…

/culled from 2018 JAMB-UTME biology question 20/

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