Pollen grains are microscopic structures that carry the male reproductive cell of plants.
The inside of the grain contains cytoplasm along with the tube cell (which becomes the pollen tube) and the generative cell (which releases the sperm nuclei).
The outer shell is made of two layers.
Are pollen grains male or female?
The stamen produces the pollen. The female parts are the stigma, the style, and the ovary at the base of the flower, which together are called the carpel. During pollination, the pollen grains from the stamen (male parts) get stuck on the stigma (female part), which is sticky for this very reason.
How pollen grains are formed?
In flowering plants, pollen grains are formed within the anther. As the anther develops, four patches of tissue grow and become four chambers or pollen sacs. The microspores within the chambers are almost ready to become pollen grains but first they must undergo three more changes which occur almost simultaneously.
What contains pollen grains at pollination?
Pollen is a fine to coarse powdery substance comprising pollen grains which are male microgametophytes of seed plants, which produce male gametes (sperm cells). Pollen in plants is used for transferring haploid male genetic material from the anther of a single flower to the stigma of another in cross-pollination.
What are pollen grains and how is pollen tube formed?
Pollen tubes are produced by the male gametophytes of seed plants. They act as conduits to transport the male gamete cells from the pollen grain—either from the stigma (in flowering plants) to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms.
Photo in the article by “Wikimedia Commons”