Assertion: It is possible to store pollen grains of a large number of species for years in liquid nitrogen 
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Reason: Some members of Rosaceae, Leguminoseae and Solanaceae, pollen grains maintain viability for a day.
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In some cereals such as rice and wheat, pollen grains lose viability within 30 minutes of their release, and in some members of Rosaceae, Leguminoseae and Solanaceae, they maintain viability for months. It is possible to store pollen grains of a large number of species for years in liquid nitrogen 
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