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NoteStudied by 8 peopleSeeded plants(class)
- all plants share:
- autotrophs
- cell walls
- all land plants:
- multicellular embryos
- alteration of generations
- apical meristems
- multicellular gametangia
- ferns onwards:
- vascular system
- sporophyte dominant
- gymnosperm + angiosperms
- dependent embryo
- seeds
- multicellular
- protected by seed coat
- can remain dormant for long time till conditions are right
- can be dispersed away from parents via wind, water, animals
- contain own food supply
- Charophytes = basal taxon
- Key adaptations:
- reduced gametophyte stage (within the seed)
- better for reproduction (protected from environment, gain nutrient from parent)
- heterospory
- two types of spores (megaspore → female gametophyte; microspore → male gametophyte)
- adds extra structures (megasporangia, microsporangia)
- beneficial for genetic variation, in case of inbreeding
- ovules (mature into seeds)
- integument → megasporangium → meiosis → megaspore(n)→ female gametophyte (n) → archegonium (n) → egg(n)
- integument→ seed coat; female gametophyte → food supply; egg (+sperm) → zygote (2n)
- integument: diploid structure protecting seed
- pollen
- microsporangium (2n), microsporocyte (2n) →meiosis → microspore (n) → mature pollen grain (n) → pollination → growth of pollen tube → discharge of nonmobile sperm into female → fertilization → zygote → embryo
- sporophyte → sporophyll →sporangia
- Gymnosperms
- most are conifers
- “naked-seed” plants
- \
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Explore Top NotesNoteStudied by 6 peopleNoteStudied by 4 peopleNoteStudied by 33 peopleNoteStudied by 12 peopleNoteStudied by 99 peopleNoteStudied by 8 people
Chapter Eight: Treatments for Depressive and Bipolar Disorders
NoteStudied by 6 peopleconscience and virtue
NoteStudied by 4 peopleChapter 17: Adaptive Immunity: Specific Defenses of the Host
NoteStudied by 33 people2.3 Water Pollution and Eutrophication
NoteStudied by 12 peopleUnfinished Nation - Chapter 9: Jacksonian America
NoteStudied by 99 peopleactualidad q1 vocab
NoteStudied by 8 people