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Chapter 30 (Angiosperm Reproduction (Products of double fertilization:…
Chapter 30
Angiosperm Reproduction
1: Pollen sticks to pollinators, and is transferred to the stigma of another flower. From there, the two cells within a pollen go to work.
2: The tube cell burrows it's way down from the stigma to the ovary. The generative cell follows, dividing along the way, forming two sperm cells. They then enter an ovule.
3: The first sperm cell fertilizes the egg, forming a diploid zygote. The other sperm cell binds with the two polar nuclei, forming what will become a triploid endosperm, which will be used as a food source for the developing plant.
Pollination
Insects an other small animals are attracted to flowers by the bright and flashy colors of the petals. The pollen of one parent plan then attaches itself onto the animal that just interacted with it. From there, the animal visits another flower, depositing the pollen on the stigma of another plant.
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Megaspore
Within the ovule, a haploid spore germinates into a female-gametophyte (egg) which is what allows for reproduction to take place.
Microspore
Develops into what is known as a pollen grain, which is the male gametophyte that is protected by a pollen wall. When it is carried by biotic or abiotic factors to an ovule, the process is called pollination.
The now fertilized ovule will then ripen and become a fruit. This can help the second generation of plants have a much wider range due to having the ability to be carried away from the parental generation.
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