Explanation:
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Flower is defined as the modified shoot or a specialized reproductive shoot in the flowering plants.
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Flower consists of four whorls, calyx, corolla, androecium and gynoecium.
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Calyx and corolla are called accessory whorls while androecium and gynoecium are called essential whorls.
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Androecium (stamen) is the male part of the flower. It has anther which bears many pollen grains and each pollen grain has two male gametes.
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Gynoecium (carpel or pistil) is the female part of the flower. A carpal has an ovary, style and stigma. An ovary contains a single or many ovules. With ovule egg cell or female gamete is present.
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Hence, the flower is the reproductive part of the plant.
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Roots, stem and leaves are the vegetative parts of the plant and do not take part in sexual reproduction.
Final Answer:
Hence, the correct option is D i.e. flower.
