The fine dust in a flower that will fertilizes other plants of the exact same type is pollen.
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It is the male part pf the plant, equivalent to a good animal’s semen, and is carried in the wind or picked up on the hip and legs of foraging bees and butterflies, and finally lands on the stigma, or female part, of the plant. When pollen blows into the eyes and nose of susceptible people, it sets off an allergic reaction.
The antibodies triggered by this reaction go through the immune mast cells. This leads to the mast cells to release inflammatory chemicals, which lead to hay fever symptoms. The pollen that causes asthma or hay fever is not, despite the name, from hay at all yet from grasses, trees, flowering plant life and fungi. In Australia, New Zealand and south Africa, grass and tree pollens are the most common source of substances.
Allergies are not just confined in order to flower pollen, pollen from pines, elm, ash, birch, oak, plantain, sorrel and nettle can also result in an attack. Similarly, the season is not just restricted to the summer months. Pollen from orchards of apples or plums can trigger hay fever among the regional population and it is a known idea that florists frequently develop allergies for their products.
In cooler climates, hay fever tends to be a little more common in towns and cities than in countryside areas. For example , in Scandinavia it is more common in the towns, and the same is true in other parts of northern European countries and in Eastern Europe. Italians are usually twice as likely to suffer from hay fever if they live in a city rather than the countryside. But in dry, arid nations, the reverse tends to be true.