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Pollen: a mass of male gametophytes generating microspores. Usually powder-like. In Orchidaceae, pollens are packed and dispersed as pollinium. Formation of pollen enables the seed-bearing plants to bypass the need of water for fertilization.
Pollination: transfer of pollen from the anther to the ovule. Flowers are usually pollinated by pollen vectors (wind or animals). The features of a flower are usually adapted to its vector, so one can make predictions of the vector type of according to the characteristics of a flower.
Cross-pollination: pollination of flowers from different plants. It is preferable for flowering plants since it encourages the random mixing of genes within the same species. There are many ways that plants have evolved to encourage cross-pollination.

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