Pollen is a advantageous powder made up of microspores produced by male plants. It’s also called flower sperm. Pollen carries the male gametes (reproductive cells) of seed plants. Seed plants embrace each conifers (plants whose seeds develop inside cones) and flowering plants. Some species self-pollinate when the pollen moves from the male a part of the plant (the stamen) to the female a part of the plant (the pistil). Cross-pollination happens when pollen travels to the pistils of different plants, both within the wind or with birds and insects that it sticks to after they land on plants to drink their nectar. The birds and insects travel from plant to plant, leaving pollen on them and pollinating them. That is how plants are fertilized and can reproduce. Pollen, especially the lightweight form discovered on anemophilous plants, equivalent to ragweed that is definitely dispersed by the wind, is an allergen that causes a selected sort of allergy referred to as hay fever. You could find out the each day pollen rely (how a lot pollen is in a cubic meter of air) out of your native weather station so you’ll know whether it is going to be a bad allergy day for you. This pollen is often called “bee pollen,” regardless that it comes from plants, as a result of it is collected from bees. The outer layer of pollen, called the exine, could be very durable and will not disintegrate even within the presence of intense heat or sturdy acids or bases. This means pollen is definitely preserved and is part of the make-up of geological sediments relationship back to historic occasions. It is also useful within the examine of the history of plant life.