Exam 2 - II: Seedless Plants

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9 Terms

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Plant

Multicellular photosynthetic eukaryote

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Advantages of land

  • Plentiful light for photosynthesis

  • CO2 present in higher concentrations

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Disadvantages of land

  • Threat of drying out (desiccation)

  • Gravity

  • Need for body support

  • Less water than water environments

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Adaptations of plants to life on land

  • Alternation of generations

  • Apical growth

  • Protection of embryo from drying out

  • Waxy cuticle on leaves prevents drying out

  • Internal skeleton to oppose gravity

  • Vascular system to move water internally

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Sporophyte

Produces spores through meiosis and represents diploid generation (2n)

<p>Produces spores through meiosis and represents diploid generation (2n)</p>
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Gametophyte

produces gametes and represents haploid generation (n)

<p>produces gametes and represents haploid generation (n)</p>
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What does it mean when a plant alternates generations?

The plant is going through two stages that alternate, haploid and diploid

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Alternation of generations process

  1. gametophyte produces gametes (n) through mitosis

  2. fertilization- zygote is formed (2n)

  3. zygote grows into a sporophyte (2n)

  4. sporophyte produces haploid spores (n) through meiosis

  5. spores grow into gametophytes

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What is a dominant generation?

The stage in a plant’s life cycle that is larger, longer-lived, and more visible, the generation that the plant is recognized as