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Questions and Answers
How many divisions occur during the formation of the embryo sac from a single haploid cell?
How many divisions occur during the formation of the embryo sac from a single haploid cell?
- Two
- Four
- One
- Three (correct)
What is the ploidy of the cells produced after meiosis in the ovule?
What is the ploidy of the cells produced after meiosis in the ovule?
- Diploid
- Tetraploid
- Haploid (correct)
- Triploid
Which of the following is an advantage of direct pollination?
Which of the following is an advantage of direct pollination?
- Increased genetic diversity
- Reduced reliance on external agents (correct)
- Greater adaptability to changing environments
- Increased risk of inbreeding
What is the main component of the pistil that contains the ovule?
What is the main component of the pistil that contains the ovule?
Flashcards
Embryo Sac Formation
Embryo Sac Formation
Process where one ovule cell undergoes meiosis and additional divisions to create the embryo sac containing the egg cell and polar nuclei.
Meiosis in Ovule
Meiosis in Ovule
A diploid ovule cell divides to produce four haploid cells, one of which forms the embryo sac after more divisions.
Components of Embryo Sac
Components of Embryo Sac
The embryo sac consists of the egg cell (oosphere) and polar nuclei formed after divisions from a haploid cell.
Pollination Types
Pollination Types
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Agents of Direct Pollination
Agents of Direct Pollination
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Study Notes
Reproduction
- Pistils are composed of stigmas, styles, and ovaries containing one or more ovules.
- Ovules undergo meiosis, producing four haploid cells.
- One haploid cell undergoes three maturation divisions to form the embryo sac, containing the egg (oosphere) and polar nuclei.
- Pollen grains must be transferred to the stigma for pollination.
- Direct pollination occurs when pollen grains from one plant land on the stigma of the same plant.
- Indirect pollination occurs between different plants
- Agents of direct pollination include wind and gravity.
- Direct pollination can lead to less diverse offspring and higher risk of degeneration.
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