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Sexual reproduction consists in the fusion of two sexual reproductive units, called gametes. Gametes are always unicellular and microscopic in size. In sexual reproduction gametes of opposite sexes always fuse in pairs. The product of their fusion is a new cell called the zygote; the zygote develops into a new plant. Asexual reproduction takes place by means of special cells or asexual reproductive units, called spores, produced by the parent plant, which grow by themselves into new individuals, without two such cells fusing together, as in sexual reproduction. Spores are always unicellular and microscopic in size.
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