Question

How many pollen tube will germinate out of a pollen grain in rose flower after 5 minutes

Answer 1

Within 2 to 3 minutes, the pollen left on stigma starts to germinate, to grow pollen tube toward the egg cell. Pollen tubes are the pathways for sperm to reach the egg. It happens within 15-60minuts after the pollen tube starts growing. The rice plant carries out double fertilization as many other higher plants do.