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?
What primarily controls the growth of the pollen tube?
What primarily controls the growth of the pollen tube?
What is formed when one male gamete fuses with the egg cell?
What is formed when one male gamete fuses with the egg cell?
What role does the second male gamete play after fertilization occurs?
What role does the second male gamete play after fertilization occurs?
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In non-endospermic seeds, what is true about the endosperm at maturity?
In non-endospermic seeds, what is true about the endosperm at maturity?
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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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Description
Test your knowledge on the processes of pollination and fertilization in flowering plants. This quiz covers the stages of ovule development and the role of gametes in forming seeds and fruits. Explore the intricate mechanisms that lead to the creation of new plant life.
