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Classify the following:
Answer variants:
The pollen grains from the anther fall on the stigma and begin to germinate.
After triple fusion, the primary endosperm nucleus develops into an endosperm (the nutritive tissue).
The nucellus is the essential part of the ovule, surrounded by two integuments and has a micropyle opening.
1. Pre-fertilization:
2. Fertilization:
3. Post-fertilization:
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