What happens to the tube nucleus after the pollen tube has penetrated the ovule?

After the pollen grain germinates into a pollen tube, the generative nucleus divides into two sperm nuclei. ... Eventually it penetrates the micropyle of an ovule and releases its two sperm into the 8-nucleate embryo sac. During double fertilization, one sperm fuses with the egg nucleus to form a zygote.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.