Plant and Animal Life Cycles - PowerPoint PPT Presentation

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Plant and Animal Life Cycles

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Plant and Animal Life Cycles Chapter ... a plant having its seeds enclosed in an ovary; a flowering plant Root cap Cambium Xylem ... Root cap, root hairs, vascular ... – PowerPoint PPT presentation

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Title: Plant and Animal Life Cycles


1
Plant and Animal Life Cycles
  • Chapter 6
  • 7th grade

2
6.1 Vocabulary Terms
  • Angiosperm, a plant having its seeds enclosed in
    an ovary a flowering plant
  • Root cap
  • Cambium
  • Xylem
  • Phloem
  • Zygote
  • Embryo
  • Cotyledons
  • Seed dispersal
  • Germination
  • Flower
  • Pollination
  • Sepals
  • Petals
  • Stamens
  • Filament
  • Anther
  • Pistils
  • Stigma
  • Style
  • Ovary

3
Functions of Roots (pg 195)
  • Roots anchor a plant, absorb water and minerals,
    and sometimes store food.
  • Types
  • Fibrous root system similarly sized roots that
    form a dense tangled mass (grass)
  • Taproot one long thick main root that is hard to
    pull out of the ground (carrot)
  • Structure Root cap, root hairs, vascular tissue
    (xylem phloem)

4
Stems (pg 196)
  • Stem carries substances and provides support.
  • Types
  • Woody hard and rigid
  • Herbaceous no wood, soft
  • Structure
  • Bark (woody) out protective layer (cork), inner
    layer of phloem
  • Cambium
  • Sapwood (active xylem) and heartwood (inactive
    xylem)

5
Annual Rings (pg 197)
  • In spring, the xylem are large and thin because
    they grow rapidly and produce wide, light brown
    rings.
  • In summer, they grow slowly and so are small and
    have thin, dark rings.
  • Trees age is found by counting the rings.
  • Rainy years, the rings are wide. In dry years,
    they are narrow.

6
Leaves (pg 198)
  • Leaves capture suns energy and carry out
    photosynthesis.
  • Structure
  • Top and bottom layers that protect the veins of
    xylem and phloem
  • Stoma open and close to control when gases enter
    (carbon dioxide) and leave (oxygen and water
    vapor)
  • Close stomata to retain water and prevent
    transpiration
  • Photosynthesis
  • Cells with most chloroplasts are near the upper
    surface to get most light
  • Water comes in from the xylem, sugar is
    transported through phloem

7
Seeds Become New Plants (pg 200)
  • Seed structure
  • Embryo begins to grow and uses food stored until
    it can make its own
  • Stored food can be in the cotyledons or outside
    them
  • Seed coat protects the embryo from drying out
  • Seed dispersal- farther from a parent has a
    better chance of survival because it doesnt have
    to compete for light, water, or nutrients
  • Pass through animal digestive systems
  • Barb-like structures that hook onto fur or
    clothing
  • Water, wind spread seeds
  • Some plants eject the seeds
  • Germination- seed absorbs water and roots grow
    down and stem grows up.

8
Flowers (pg 202)
  • The colors and scents produced by flowers attract
    animals to pollinate.

9
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