in Sexual reproduction in flowering plants by

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The floral adaptations of hydrophilous flowers are:

  1. Flowers are colorless, small, inconspicuous without nectar and fragrance.
  2. Pollen grains are long, ribbon-like structures which are carried with current of water.
  3. The pollen grains are light but covered with wax, in order to protect them from wetting.

Yes,finally i got the answer.
Can you please tell me if these pollen grains also have sporopollenin in their exine... or only mucilagenous covering??? Thanks..