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Questions and Answers
What triggers the death of one synergid?
What triggers the death of one synergid?
The pollen tubes arrival
What does the arrival of the pollen tubes create?
What does the arrival of the pollen tubes create?
A passage into the embryo sac
Where are two sperm released?
Where are two sperm released?
Near the female gametophyte
What is the term for fertilization in flowering plants?
What is the term for fertilization in flowering plants?
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When does fertilization begin?
When does fertilization begin?
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What does one sperm fertilize in double fertilization?
What does one sperm fertilize in double fertilization?
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What does the fusion of the egg and the sperm create?
What does the fusion of the egg and the sperm create?
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With what does the other sperm combine?
With what does the other sperm combine?
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What kind of nucleus is created by the fusion of the two polar nuclei?
What kind of nucleus is created by the fusion of the two polar nuclei?
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What does the triploid nucleus develop into?
What does the triploid nucleus develop into?
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What kind of tissue is the endosperm?
What kind of tissue is the endosperm?
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Where is the endosperm located?
Where is the endosperm located?
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Double fertilization ensures that endosperm forms only in fertilized ovules, conserving nutrients.
Double fertilization ensures that endosperm forms only in fertilized ovules, conserving nutrients.
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What degenerates near the time of the tube nucleus?
What degenerates near the time of the tube nucleus?
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Study Notes
Fertilization
- Pollen tubes arrive, triggering the death of one synergid, creating a passage into the embryo sac
- Two sperm are released near the female gametophyte to complete fertilization
Double Fertilization
- Fertilization begins when two sperm reach the female gametophyte
- One sperm fertilizes the egg, forming the zygote
- The other sperm combines with the two polar nuclei, creating a triploid (3n) nucleus in the central cell
- This cell develops into the endosperm (multicellular, food-storing tissue in the seed)
- Double fertilization ensures that endosperm forms only in fertilized ovules, conserving nutrients
- Near this time, the tube nucleus, one synergid cell, and the antipodal cells degenerate
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Description
This quiz covers the critical processes of fertilization and double fertilization in plants. It emphasizes the roles of pollen tubes, sperm cells, and the formation of the zygote and endosperm. Test your understanding of how these processes contribute to plant development and nutrient conservation.
