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प्रश्न
Give an example of a plant which came into India as a contaminant and is a cause of pollen allergy.
उत्तर
Pollen grains of many species, allergic diseases and bronchial afflictions in some people. The pollen grains of Parthenium or carrot grass which came to India as contaminant with imported wheat cause pollen allergy.
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संबंधित प्रश्न
Still it is observed that it does not form a continuous layer around the pollen grain. Give reason.
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