Podcast
Questions and Answers
What happens first when a pollen grain lands on a stigma?
What happens first when a pollen grain lands on a stigma?
- The generative nucleus divides to form gametes.
- The pollen tube grows and releases enzymes.
- The pollen grain absorbs the sugary liquid from the stigma. (correct)
- The pollen tube penetrates the ovule.
What primarily controls the growth of the pollen tube?
What primarily controls the growth of the pollen tube?
- The ovule
- The generative nucleus (correct)
- The pollen grain
- The tube nucleus
What is formed when one male gamete fuses with the egg cell?
What is formed when one male gamete fuses with the egg cell?
- Endosperm nucleus
- Zygote (correct)
- Ovule
- Embryo
What role does the second male gamete play after fertilization occurs?
What role does the second male gamete play after fertilization occurs?
In non-endospermic seeds, what is true about the endosperm at maturity?
In non-endospermic seeds, what is true about the endosperm at maturity?
Flashcards
Pollen Germination
Pollen Germination
When a pollen grain absorbs stigma liquid and begins to grow a pollen tube.
Pollen Tube Function
Pollen Tube Function
The pollen tube grows, releasing enzymes to digest stigma and style tissue for fertilization.
Generative Nucleus
Generative Nucleus
The nucleus that controls pollen tube growth and divides to form two male gametes.
Zygote Formation
Zygote Formation
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Endosperm Development
Endosperm Development
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Study Notes
Pollination and Fertilization
- Pollination occurs when pollen lands on the stigma of a flower.
- Pollen tubes grow from the pollen grains, absorbing sugary fluids from the stigma.
- The pollen tubes digest the tissues of the style and enter the ovule through a micropyle.
- The generative nucleus divides to produce two male gametes (sperm cells).
- One sperm fuses with the egg cell to form a zygote (fertilized egg), initiating the process of fertilization.
- The other sperm fuses with the two polar nuclei to form the endosperm, a nutritive tissue for the developing embryo.
- The ovule develops into a seed, and the ovary develops into a fruit.
Stages of Ovule Development
- Stage (a): Shows a developing ovule.
- Stage (b): Shows an ovule with a pollen tube entering.
- Stage (c): Indicates the stage after fertilization.
- Stages (d) and (e): Represent the final stages of seed development: a mature seed showing a fully developed embryo and surrounding endosperm.
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