The place of production of the pollen grain differs according to the plant:
- In gymnosperms (seed-producing plants), the pollen grain is produced in strobiles.
- While in angiosperms (flowering plants), the pollen grain is produced in flowers, specifically in the anther (the part of the stamen where pollen is produced).
The anther is a kind of tissue-covered pouch that forms spores. The oosphere (unfertilized egg), in turn, is produced in the ovary of the plant.
As plants reproduce, the pollen grain finds the archegonium, the place where the oosphere is produced and located.
The antherozoids (structure or organ producing and containing male gametes) are then released into the pollen tube. Then the pollen tube which moves toward the oosphere in the archegonium.
The pollen grain:
- A pollen grain is the microspore of the plant, That is, the spore that contains the male gametophyte.
- The pollen grain is produced in the anther of the flower, which is the the terminal part of a stamen of a flower.
- When germinating, the pollen grain produces the pollen tube. This tube ensures the transport of male gametes to the oosphere.
- When the pollination is done by the wind, it is called anemophilous pollination. In this case, the Odoriferous gland is absent.
About the author:
Daniel Vol has been writing about science and the environment since 2006.