PLANTS!

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PLANTS!
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Overview of Plants

• Are plants multicellular or unicellular?

Multicellular

• Eukaryotic or Prokaryotic?

Eukaryotic

• Of what is their cell wall composed?

Cellulose

• How do they obtain nutrition?

Autotrophs
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Plant Cell Structure
Vacuole
Chloroplast
Cell Wall
Nucleus
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Plant Evolution
Common Ancestor?
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Seed/Flowers 130 mya
Seed/Cone 360 mya
Vascular 400 mya Seedless
Nonvascular 550 mya
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Common Ancestor?
Algae Is it a Plant?
www.alagebase.org - courtesy of Mike Guiry
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Bryophytes - Nonvascular Plants

• - early land plants, no vascular system.

Without a vascular system, they can not support
roots, stems, and leaves.
Ex. Mosses, liverworts
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Pteridophytes - Primitive Vascular

• Seedless
• Have vascular tissue
• Can support roots, stems, leaves
• Size varies greatly
• Rely on water for reproduction
• Ex Ferns, club mosses, horsetails

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Gymnosperms Seed Plants

• Have vascular tissue
• Can support roots, stems, leaves
• Size varies greatly
• Have pollen to reproduce away from water
• Have naked seeds produced in cones
• Ex Redwood, Spruce, Pine

Female Cone
Male (Pollen Cone)
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Angiosperms Flowering Plants

• Have vascular tissue
• Can support roots, stems, and leaves
• Size varies greatly
• Have pollen to reproduce away from water
• Have flowers to surround and protect the seeds
  and to attract pollinators
• Most diverse and widespread group of land plants
• Have covered seeds dispersed in fruit
• Ex Rose, cucumber, tomato

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2 main classes of Angiosperms Monocots and
Dicots
- based on the number of seed leaves (cotyledons)
they produce.
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Monocots
lilies, orchids, yuccas, grasses, and grains
(65,000 species)
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Dicots
includes roses, peas, sunflowers, oaks, and maples
(165,000 species)