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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.
अति संक्षिप्त उत्तर
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उत्तर
Pollen grains of many species cause allergic diseases and bronchial afflictions in some people. The pollen grains of Parthenium or carrot grass, which came to India as a contaminant with imported wheat, cause pollen allergy.
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