Pollen grains
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Pollen grains
land on stigma before they lose viability which depends on temp. & humidity
Viability is 30 minutes in cereals like rice & Wheat.
Viability is for months in Rosaceae, Leguminosae & Solanaceae
All
Pollen viability varies significantly among species. Cereals like rice and wheat have short viability, while families like Rosaceae and Leguminosae maintain it for months.