Podcast
Questions and Answers
Which of the following is a part of the mature ovule?
Which of the following is a part of the mature ovule?
- Endosperm (correct)
- Integument (correct)
- Seed coat
- Pollen grain
What is the function of the micropyle in the ovule?
What is the function of the micropyle in the ovule?
It serves as an opening for the entrance of the pollen tube.
Double fertilization involves the fusion of one sperm with the egg cell and a second sperm with the polar nuclei.
Double fertilization involves the fusion of one sperm with the egg cell and a second sperm with the polar nuclei.
True (A)
What is formed when the sperm unites with the egg cell?
What is formed when the sperm unites with the egg cell?
What tissue is produced when the second sperm unites with the two polar nuclei?
What tissue is produced when the second sperm unites with the two polar nuclei?
What does the radicle develop into?
What does the radicle develop into?
The _______ are the first leaves of the developing embryo.
The _______ are the first leaves of the developing embryo.
What happens to the integuments of the ovule after fertilization?
What happens to the integuments of the ovule after fertilization?
Seed formation does not involve any changes in the ovule size.
Seed formation does not involve any changes in the ovule size.
Flashcards
What is Endosperm?
What is Endosperm?
Nutritive tissue that supports the developing plant embryo.
What is the Micropyle?
What is the Micropyle?
Small opening in the ovule facilitating pollen tube entry for fertilization.
What is a Zygote?
What is a Zygote?
The product of the sperm uniting with the egg cell.
What is a Radicle?
What is a Radicle?
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What are Cotyledons?
What are Cotyledons?
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What happens to the Integuments?
What happens to the Integuments?
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Study Notes
Ovule Structure
- The ovule contains the integument, micropyle, nucellus, endosperm, and embryo sac.
- The integument becomes the testa which protects the embryo.
- The micropyle is the opening where the pollen tube enters.
- The nucellus provides nutrition, as does the endosperm.
- The embryo sac contains the ovum (megaspore) which becomes the embryo.
Double Fertilization
- Double fertilization occurs when two sperm cells fertilize the ovule.
- One sperm cell fuses with the egg cell to form the zygote (2n).
- The second sperm cell fuses with the two polar nuclei to form the endosperm (3n).
Plant Embryo Development
- The radicle is the first part of the embryo to emerge and grows downwards, forming the root.
- The cotyledons are the first leaves of the embryo that grow upwards.
- Fertilization initiates embryo development which causes changes in the ovule and ovary.
- Changes may occur in other parts of the flower too.
- The ovule increases in size to form the seed.
- The integuments thicken and become lignified forming the testa, which protects the embryo.
- The embryo develops further, with the radicle and cotyledons becoming apparent.
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