Observe the diagram and answer the questions :[Diagram: longitudinal section of a flower. A points to the green outermost whorl at the base, B to a petal, C to the top of the long central carpel, and D to an anther on a filament.](a) Label the parts…

Answer:

(a) A — sepal (calyx); B — petal (corolla); C — stigma (of the carpel); D — anther (of the stamen).

(b) Calyx (whorl of sepals). (The other whorls are corolla, androecium and gynoecium.)

(c) Anther and filament.

(d) Stigma and style (ovary is the third part).

The flower has four whorls arranged on the thalamus. The calyx and corolla are accessory whorls, while the androecium (male) and gynoecium (female) are essential whorls. The androecium consists of stamens, each with an anther and a filament; the gynoecium consists of carpels, each with stigma, style and ovary containing ovules.