a) Androecium and gynoecium
b) Gynoecium and androecium
c) Angiosperm and gymnosperm
d) Gymnosperm and angiosperm
Answer: a) Androecium and gynoecium
Explanation: Whorls of stamens are collectively known as androecium. The androecium is the male reproductive part of the flower, which contains anthers and filaments.
Whorls of carpels are collectively known as gynoecium. It consists of ovary, style and stigma, which makes up the female reproductive part of the flower.
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