28 Jan. 2013Intro-Plants.ppt1 INTRODUCTION TO PLANTS Kingdom Plantae.
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Transcript of 28 Jan. 2013Intro-Plants.ppt1 INTRODUCTION TO PLANTS Kingdom Plantae.
28 Jan. 2013 Intro-Plants.ppt 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
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?
28 Jan. 2013 Intro-Plants.ppt 4
28 Jan. 2013 Intro-Plants.ppt 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
28 Jan. 2013 Intro-Plants.ppt 6
Plant Body
• Shoot system– Stem & branches– Leaves– Nodes & internodes– Reproductive
structures
• Root system– Primary roots– Branch roots
28 Jan. 2013 Intro-Plants.ppt 7
Plants are different
• Plant body: Shoot & Root with vascular tissues Xylem
• water & minerals UP
Phloem • sap DOWN
Cambium • cell division for xylem
& phloem
28 Jan. 2013 Intro-Plants.ppt 8
Plants are different
• Growth at meristems• Apical meristem
• ”primary” growth (length)
• Lateral meristem = vascular cambium• “secondary” growth
(girth)
28 Jan. 2013 Intro-Plants.ppt 10
Plants are different
• Life Cycle = Alternation of generations.Sporophyte generation (diploid, 2n)Gametophyte generation (haploid, 1n)
28 Jan. 2013 Intro-Plants.ppt 11
Sexual Life Cycle
• Generalized life cycle of sexually reproducing species. Fertilization Meiosis
28 Jan. 2013 Intro-Plants.ppt 12
Animal Life Cycle
• Multicellular diploid Zygote, embryo, young (larva), adult
• Unicellular haploid sperm or egg
28 Jan. 2013 Intro-Plants.ppt 13
Plant life cycle
• Alternation of generations:
• Diploid sporophyte• Haploid gametophyte
multicellular sperm or egg
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.)
28 Jan. 2013 Intro-Plants.ppt 16
28 Jan. 2013 Intro-Plants.ppt 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.