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INTRODUCTION TO PLANTS

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INTRODUCTION TO PLANTS Kingdom Plantae 28 Jan. 2013 Intro-Plants.ppt * 28 Jan. 2013 Intro-Plants.ppt * Plants are different from animals! Be prepared to Journal 28 ... – PowerPoint PPT presentation

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Title: INTRODUCTION TO PLANTS


1
INTRODUCTION TO PLANTS
  • Kingdom Plantae

2
Plants are different from animals! Be prepared
to Journal
3
Plants are different
  • Cell walls of cellulose
  • complex carbohydrate
  • Acquire energy by photosynthesis
  • Chloroplasts with chlorophyll a, b
  • Chlorophyll reflects green part of visual spectrum

4
Journal the following
  • Different structural adaptations of plants?
  • Different life cycles in a plant sporophyte vs.
    gametophyte
  • How Plant life cycle is different than animal
    life cycles?
  • What is the good and bad about asexual
    propagation?

5
Plants are different
  • Plant body
  • Shoot stem (nodes, internodes), leaves,
    reproductive structures (flowers, cones,
    etc.)usually above ground
  • Root usually below ground, in soil
  • Variations

6
Plant Body
  • Shoot system
  • Stem branches
  • Leaves
  • Nodes internodes
  • Reproductive structures
  • Root system
  • Primary roots
  • Branch roots

7
Plants are different
  • Plant body Shoot Root with vascular tissues
  • Xylem
  • water minerals UP
  • Phloem
  • sap DOWN
  • Cambium
  • cell division for xylem phloem

8
Plants are different
  • Growth at meristems
  • Apical meristem
  • primary growth (length)
  • Lateral meristem vascular cambium
  • secondary growth (girth)

9
Plant Life Cycles are different
  • Alternation of generations

10
Plants are different
  • Life Cycle Alternation of generations.
  • Sporophyte generation (diploid, 2n)
  • Gametophyte generation (haploid, 1n)

11
Sexual Life Cycle
  • Generalized life cycle of sexually reproducing
    species.
  • Fertilization
  • Meiosis

12
Animal Life Cycle
  • Multicellular diploid
  • Zygote, embryo,
  • young (larva), adult
  • Unicellular haploid
  • sperm or egg

13
Plant life cycle
  • Alternation of generations
  • Diploid sporophyte
  • Haploid gametophyte
  • multicellular
  • sperm or egg

14
Plant life cycle Example fern
15
Plant life cycle Example flowering plant
16
Asexual propagation
  • Plants often reproduce asexually
  • runners,
  • rhizomes,
  • tubers
  • roots form new shoots
  • fragmentation (willow, privet, Forsythia)
  • Used by nurseries to propagate varieties
  • ornamental plants (roses, crepe myrtle)
  • fruit trees (apple, etc.)

17
Asexual propagation
  • Advantages
  • One individual can reproduce
  • Copies a successful genome exactly!
  • offspring are clones of parent
  • offspring expected to be as successful as parent
  • May be faster
  • no time for courtship, pollination, etc.

18
Asexual propagation
  • Disadvantages
  • All offspring are genetically identical.
  • If environment changes, all are equally
    disadvantaged.
  • (Sexual reproduction produces variation in
    offspring. Mixes genes from two parents.)
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