Length of pollen tube depends on the distance between

  1. pollen grain and upper surface of stigma
  2. pollen grain on upper surface of stigma and ovule
  3. pollen grain in anther and upper surface of stigma
  4. upper surface of stigma and lower part of style

Answer

Pollen tube carries male gametes to ovule and hence, is long equal to the distance between stigma and ovary.

The correct option is B.

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