Pollen:
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Pollen is a fine yellowish powder that is transported from plant to plant by the wind, by birds, by insects or by other animals.
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The transportation of these pollen helps in fertilisation of plants.
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At times these remain suspended in the air and form part of the air we breathe. When inhaled by humans, they put a strain on the upper respiratory system.
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They cause widespread upper respiratory tract and naso-bronchial allergy with manifestations like asthma, seasonal rhinitis, and bronchial irritation.