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CHAPTER 27

CHAPTER 27 - CHAPTER 27 THE PLANT KINGDOM SEEDLESS PLANTS...

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CHAPTER 27 THE PLANT KINGDOM: SEEDLESS PLANTS ADAPTATIONS OF PLANTS Cuticle o Covers the aerial portion of a plant o Helps prevent desiccation, or drying out, of plant tissues by evaporation Stomata o Tiny pores that dot the surfaces of leaves and stems o Facilitate gas exchange Gametangia o Multicellular sex organs Embryo o Multicellular structure that develops from the fertilized egg The plant life cycle alternates haploid and diploid generations Alteration of generations o Spend part of their lives in a multicellular haploid stage and part in a multicellular diploid stage Gametophyte generation o Haploid portion of the life cycle o Gives rise to haploid gametes by mitosis Sporophyte generation o Diploid portion of the life cycle o Produces haploid spores by meiosis Antheridia o Male gametangia in which sperm cells form Archegonia o Female gametangia, each bearing a single egg Zygote o Fertilized egg Sporogenous cells o Special spore-producing cells that divide by meiosis to produce spores
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CHAPTER 27 - CHAPTER 27 THE PLANT KINGDOM SEEDLESS PLANTS...

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