Pollen grains lose viability within approximately how many minutes after their release in cereals such as rice and wheat?

30 minutes

In cereals such as rice and wheat, pollen grains lose their viability within approximately 30 minutes after they are released.

This means that if the pollen grains do not land on the stigma of a compatible flower within this timeframe, they will no longer be able to bring about fertilization.

After 30 minutes, the pollen grains become non-functional and are unable to successfully fertilize the ovules.

It's worth noting that this viability period can vary among different plant species and is influenced by factors such as temperature and humidity