Reproduction in Plants

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Questions and Answers

What is the direct result of pollen falling on the stigma of a plant?

  • The formation of the embryo sac begins.
  • A haploid zygote can form.
  • A diploid zygote can form. (correct)
  • An egg cell is immediately formed.

Which of these agents directly contributes to self-fertilization?

  • Insects
  • Wind (correct)
  • Water
  • Birds

What is the difference between direct and indirect pollination?

  • Direct pollination is more efficient than indirect pollination.
  • Indirect pollination allows for increased diversity in offspring compared to direct pollination.
  • Direct pollination results in genetically similar offspring, while indirect pollination creates genetic diversity.
  • Direct pollination is more likely to result in self-fertilization, while indirect pollination is less likely. (correct)

How many haploid cells are formed during the meiosis of an ovule cell?

<p>Four (B)</p> Signup and view all the answers

What is the function of the polar nuclei in the embryo sac?

<p>To combine with a sperm nucleus to form the endosperm. (C)</p> Signup and view all the answers

Flashcards

Pistil

The female reproductive part of a flower, consisting of stigmas, styles, and ovaries.

Ovule

A structure within the ovary containing a cell that undergoes meiosis to form haploid cells.

Meiosis in Ovule

A process producing four haploid cells from a single ovule cell, with one maturing into the embryo sac.

Direct Pollination

Pollen lands on the stigma of the same plant, resulting in self-fertilization with less genetic diversity.

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Indirect Pollination

Pollen is transferred from one plant to the stigma of another plant, enhancing genetic diversity.

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Study Notes

Reproduction in Plants

  • Pistils are composed of stigmas, styles, and ovaries containing one or more ovules
  • Meiosis in an ovule produces four haploid cells
  • One haploid cell undergoes three further divisions to form the embryo sac, containing an egg cell (oosphere) and polar nuclei
  • Pollen must be transported to the stigma for fertilization
  • Direct pollination occurs when pollen from a flower lands on the stigma of the same flower
  • Indirect pollination occurs between different plants
  • Agents of direct pollination include wind, gravity, and self-pollination (in plants)

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