Concept: This question tests your basic knowledge of the structure of a flower, specifically the female reproductive part known as the carpel or pistil.

Why (A) is correct: The carpel, which is the female reproductive unit of a flower, is indeed composed of three distinct parts: the stigma (receives pollen), the style (connects stigma to ovary), and the ovary (contains ovules).

Why other options are wrong:

• (B) stigma, pistil, placenta: Pistil is another term for carpel (or a group of fused carpels), not a part of it. Placenta is the tissue within the ovary to which ovules are attached.
• (C) anther, filament, thallamus: Anther and filament are parts of the stamen (male reproductive organ). Thalamus (or receptacle) is the part of the flower stalk where the floral organs are attached.

Common Mistake: Students sometimes confuse the terms carpel and pistil, or mix up the parts of the male and female reproductive organs.

NEET Tip / Mnemonic: Remember the female parts as Stigma, Style, Ovary (SSO) to easily recall the components of a carpel.

Correct Answer: (A)