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2006-12-14 09:57:47 · 3 answers · asked by joe123chem 1 in Science & Mathematics ➔ Biology
A pollen grain is a male gametophyte. It is a haploid structure and consists of 3 cells in flowering plants. Two of these cells are sperm cells and, following fertilization, these are carried by a pollen tube to the female gametophyte within the ovule of the flower (note that the process is a little different in non-flowering seed plants).
The pollen tube means that seed plants are no longer dependant on water for fertilization. In the 'lower' land plants (such as mosses) the sperm are flagellated and must swim to the female structures.
2006-12-14 14:22:00 · answer #1 · answered by jowpers 2 · 0⤊ 0⤋
Pollen grain - a structure produced by plants, containing the male gamete to be used in reproduction. The gamete is covered by protective layers which perform there role until the pollen grain is capable of fertilising when reaching the female stigma.
2006-12-19 08:40:49 · answer #2 · answered by cucumis_sativus 5 · 0⤊ 0⤋
In the process of reproduction as due to pollen grains the processes of pollination and fertilization occurs. pollen grains are male gametes of the flowering plants. pollen grains fertilize with the ovaries and seed is produced which contains a new embryo which further develops into a new seedling.
2016-05-24 05:49:15 · answer #3 · answered by ? 4 · 0⤊ 0⤋