| 11. | Another report states that pollen tubes do not change growth direction under AC electric fields.
|
| 12. | The growth of the pollen tube is controlled by the vegetative ( or tube ) cytoplasm.
|
| 13. | Inaperaturate pollen grains often have thin walls, which facilitates pollen tube germination at any position.
|
| 14. | Lipids at the surface of the stigma may also stimulate pollen tube growth for compatible pollen.
|
| 15. | From here, a pollen tube seeks out the female gametophyte and if successful, fertilization occurs.
|
| 16. | Tip growth occurs in algae ( e . g ., root hairs and pollen tubes ).
|
| 17. | Once the pollen tube successfully attains an ovule, it delivers the two sperm cells with a burst.
|
| 18. | In chalazogamous plants, the pollen tubes enter the ovule through the chalaza instead of the micropyle opening.
|
| 19. | The sperm nuclei reach the eggs through fertilization tubes, similar to the pollen tube mechanism in plants.
|
| 20. | It is an outgrowth of the placenta, important in nourishing and guiding pollen tubes to the micropyle.
|
