plant diversity. land plants evolved from green algae occurred 500 million years ago plants have...
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Evolutionary Evidence 1) Produce cellulose for cell walls in the same fashion 2) The peroxisomes have enzymes that reduce the effects of photorespiration 3) Sperm structure is related 4) Produce cell plates the same way 5) Genetic similaritiesTRANSCRIPT
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Plant Diversity
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Land Plants Evolved from Green Algae
Occurred 500 million years agoPlants have enabled the life of other organisms on landSupply oxygen & provider of energy
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Evolutionary Evidence1) Produce cellulose for cell walls in the same fashion2) The peroxisomes have enzymes that reduce the effects of photorespiration3) Sperm structure is related4) Produce cell plates the same way5) Genetic similarities
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Alteration of Generation2 stages:1) Gametophyte2) Sporophyte
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In gametophyte stage: Gametes are producedEgg & sperm fuse to form a diploid zygote (sporophyte)
Divides mitoticallySporophyte produces spores by meiosis
The zygote develops within the tissues of the female
Provides nutrientsReferred to as embryophytes
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AnatomyFemales = archegonia (single egg produced)Males = antheridia (many sperm produced)
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Moss Life CycleNonvascular (no xylem or phloem)Life cycle dominated by gametophytes
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Ferns & Seedless Vascular Plants
First to grow tallRequire water for fertilizationDominated by the sporophyte stage
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Seeded Plants5 adaptations:1) Reduced gametophytes - microscopic2) Heterospory – 1 for male, 1 for female3) Ovules & eggs – increases reproductive fitness4) Pollen & sperm – Key adaptation to land5) Seeds – protect the embryo
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GymnospermsNaked seedsUsually found on conesPines, spruces, firs, & redwoods
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Evolutionary Advances of the Pine Life Cycle
1) Ovulate cone bears ovules2) Sporangia in pollen cone produce spores3) Pollination4) Haploid spore develops into female gametophyte to form eggs5) Male gametophyte forms sperm6) Zygote develops into embryo, ovule becomes seed7) Seed germinates & embryo grows
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AngiospermsSeeded plantsContain flowers & fruit250,000 species – 90% of all plants
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Flower:SepalsPetalsStamens – male reproductionCarpels – female reproduction
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FruitsMature ovaries of the plantAs seeds develop from ovules after fertilization, the wall of the ovary thickens to become fruitFruits help disperse the seeds
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Evolutionary Advances of the Angiosperm Life
Cycle1) Haploid spores in anthers develop into pollen grains2) Haploid spore in ovule develop into an egg3) Pollination & growth of pollen tube4) Zygote5) Seed6) Fruit7) Seed germinates & embryo grows