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Chapter 38. Angiosperm Reproduction. Angiosperm Reproduction. Angiosperms have 3 unique features: Flowers, Fruits, & Double Fertilization Microsporangia Pollen sacs in the anther Diploid cells = meiosis  male gametophyte (pollen) Pollen has 2 haploid nuclei

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chapter 38
Chapter 38

Angiosperm Reproduction

angiosperm reproduction
Angiosperm Reproduction
  • Angiosperms have 3 unique features:
      • Flowers, Fruits, & Double Fertilization
  • Microsporangia
      • Pollen sacs in the anther
      • Diploid cells = meiosis  male gametophyte (pollen)
      • Pollen has 2 haploid nuclei
          • Tube nucleus – 1 sperm develops into a pollen tube
          • Generative nucleus – divides into 2 sperm cells which remain inside the pollen tube
ovary
Ovary
  • Ovules form with a diploid cell
  • Soon 4 haploid megapsores form
  • Eventually get 8 haploid nuclei, but only 3 are most important
      • 1 haploid nucleus = egg
          • Will combine with sperm nucleus to form the zygote
      • 2 other nuclei are called polar nuclei
          • Polar nuclei will fuse with sperm nucleus to make 3n endosperm
pollination
Pollination
  • Pollen lands on stigma
  • Pollen tube made from pollen grain
      • Pollen tube grows down into the ovary
  • When pollen tube reaches ovule, double fertilization occurs
double fertilization
Double Fertilization
  • Double fertilization is the union of 2 sperm cells forming zygote & endosperm
  • Unique to angiosperms
  • 1 sperm fertilizes the egg  zygote
      • Zygote develops into the embryo  sporophyte
  • Other sperm combines with both polar nuclei = 3n nucleus
      • This 3n tissue  endosperm
      • Endosperm – food storing tissue in the seed
after double fertilization
After double fertilization
  • Ovule develops into a seed
  • Ovary develops into fruit which encloses the seed
      • Fruit protects the enclosed seed
      • Fruit aids in dispersal by wind or animales
  • Seed coat – protects embryo & its food supply
  • Radicle – embryonic root
  • Epicotyl – shoot tip with pair of miniature leaves
slide12
Seed
  • As the seed matures, It goes dormant
      • Low metabolic rate, growth and development are suspended
  • Seed resumes growth given suitable environmental conditions for germination
asexual reproduction in plants
Asexual Reproduction in Plants
  • Asexual reproduction in plants is called vegetative reproduction
  • Fragmentation
    • Type of vegetative reproductive
    • When a part of the parent plant is separated and then generates into a new plant, genetically identical to parent plant
  • Self-fertilization is another means of asexual reproduction