Mention two environmental factors that affect pollen viability. [Delhi 2011C]
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1. temperature
2. humidity
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The pollen viability might be influenced by different factors like time of anthesis, temperature, humidity, seasonal effect, flower position, anther protection, age of pollen, pollinator type, pollen packaging, number of nucleus, carbohydrate content and desiccation risk, pollen metabolism and genetic variability
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