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Does pollen tube grow before or after pollination occurs?
Pollen tube growth occurs after pollination. Pollen grains are deposited on the stigma during pollination, which then germinate to produce pollen tubes. These tubes grow down through the style to reach the ovule for fertilization.
How does the pollen grains tube reach the ovary?
Pollen tubes are extensions of pollen grains that grow and elongate to penetrate the ovary. They are guided by chemical signals released by the ovary, which direct the path of the pollen tube towards the ovule where fertilization can occur.
What is the purpose of using sucrose solution when germinating pollen grains?
Using a sucrose solution in germinating pollen grains provides a readily available energy source for the pollen grains as they begin to germinate. This helps to support metabolic processes and allows the pollen grains to grow a pollen tube, which is necessary for fertilization to occur.
Where the pollen tube grow to or through?
The pollen tube grows out of or through the pollen grain.
Where does fertilization take place in conifer?
In the female ovary
In what structure do the pollen grains come in contact with the ovule?
Pollen grains come in contact with the ovule through the stigma, which is the receptive tip of the female reproductive organ (pistil) in a flower. Pollen grains germinate on the stigma, form a pollen tube, and then grow down to the ovule for fertilization.
What are the steps of pollination to the point that the seed is formed?
-pollen sticks to the stigma at the end of the pistil -pollen tubes grow down the pistil to the egg cells -sperm cells from the pollen moves down the tubes -fertilization combines DNA
Where do the pollen grains go after pollination?
After pollination, the pollen grains germinate on the stigma and grow a pollen tube down the style to reach the ovule. The pollen tube delivers sperm cells to fertilize the egg cell within the ovule, leading to the formation of a seed.
What is the function of the style in the flower?
The style in a flower is part of the female reproductive structure that connects the ovary to the stigma, allowing pollen to reach the ovules for fertilization. It plays a crucial role in the pollination process by providing a pathway for pollen tubes to grow and facilitate fertilization.
How is the stigma of a plant adapted to trap pollen grains and provide a place for them to grow?
The stigma is adapted to trap pollen grains through its sticky surface or specialized structures that can capture and hold the pollen grains. Once trapped, the stigma provides a suitable environment for the pollen grains to germinate and grow pollen tubes, which then transport the male gametes to the ovary for fertilization to occur. This process increases the likelihood of successful pollination and seed production in plants.
Why do pollen grains only produce tubes in flowers of their own kind?
because they dony like other species
Do all pollen tubes reach the ovule?
No, not all pollen tubes reach the ovule. After pollination, multiple pollen tubes may grow down the style, but typically only one successfully penetrates the ovule to deliver sperm cells for fertilization. The competition among pollen tubes ensures that the most viable one reaches the ovule, while others may abort or be blocked along the way.
