If a female orchid bee has just left a Brazil nut tree with nectar in her stomach, and if she visits another flower on a different Brazil nut tree, what is the sequence in which the following events should occur?
1)double fertilization
2)pollen tube emerges from pollen grain
3)pollen tube enters micropyle
4)pollination

Question

Quizplus · Accepted Answer

The correct sequence starts with pollination (4), which occurs when the bee transfers pollen to the stigma of a flower. Following pollination, the pollen tube emerges from the pollen grain (2) and grows down the style towards the ovary. The pollen tube then enters the micropyle (3), an opening in the ovule, allowing for sperm to reach the egg and complete double fertilization (1).

If a Female Orchid Bee Has Just Left a Brazil