A seed of a flowering plant can best be described as

Analyze the question: It asks what a seed of a flowering plant is best described as. This is about the reproductive structures of angiosperms and what each part develops into after fertilisation.

Concept: After fertilisation in a flowering plant:

• The ovule develops into the seed.
• The ovary develops into the fruit.
• The zygote develops into the embryo, made up of the radicle, plumule and cotyledon(s).
• The integuments of the ovule become the testa (seed coat).

Step-by-step solution:

• A. Radicle and plumule: These are only parts of the embryo (the future root and shoot). A seed also has cotyledons, a seed coat and often endosperm, so this is incomplete.
• B. The developed ovule: The whole seed, including the embryo, food store and seed coat, forms from the ovule. This is the most complete and accurate description.
• C. The embryo and endosperm: These are the main internal contents of the seed, but this leaves out the testa. It describes what is inside the seed, not what the seed is.
• D. Developed ovary: This is the fruit, not the seed.

Answer: B. The seed is the developed (matured) ovule.

Tip: Remember "Ovule → Seed, Ovary → Fruit." Both start with a vowel-sound pair: Ovule goes to Seed, Ovary goes to Fruit. If an option says "ovary", think fruit. If it says "ovule", think seed.