alternation of generations plant life cycles have two alternating generations: a diploid phase (2n)...
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Alternation of GenerationsPlant life cycles have two alternating generations:
a diploid phase (2N) and a haploid phase (N)
• During alternation of generations, mitosis and meiosis alternate to produce the two types of reproductive cells – gametes and spores.
• The diploid (2N) phase is known as the sporophyte, or spore-producing plant.
• The haploid (N) phase is known as the gametophyte, or gamete-producing plant.
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Gametophyte is makes gametes through mitosis2 gametes unite in fertilization to form a diploid zygote
Zygote divides and grows by mitosis and develops into a diploid sporophyteSporophyte produces spores by meiosis (spores are haploid)
Haploid spores divide and multiply by mitosis into a haploid gametophyte
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Plant Divisions Plants are divided into groups based on:
1. Presence or Absence of Vascular Tissue Xylem – moves water from the roots up to the
leaves Phloem – moves sugars made in the leaves
down to the roots
“Xy goes high; phlo goes low”
2. Whether or not they make seeds3. Whether or not they have flowers
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The Four Plant Divisions
The four groups are: 1. Bryophytes (mosses)2. Pterophyta (ferns) 3. Gymnosperms (cone bearers)4. Angiosperms (flowering plants)
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Bryophytes
• Examples include mosses and liverworts
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Characteristics of Bryophytes
• Bryophytes do not have vascular tissue to move water/nutrients– They don’t get very tall
• Rely on osmosis to move water
• No cuticle = rapid water loss
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Sphagnum
(peat moss)
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Mosses lack true roots but they
have rhizoids to anchor the plant
in the soil
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Ferns
• Ferns are vascular – they have xylem and phloem
• Ferns are seedless plants; They make spores
• Thick, underground stem = rhizome
• Leaves are called “fronds”
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Ferns & Horsetails
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Ferns reproduce with spores
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Fern frond
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The Seed Plants:Gymnosperms (cones) & Angiosperms (flowers)
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Seed Plants
• Seed plants produce seeds, which are reduced sporophyte plants within a protective coat
• Seeds may be surrounded by a fruit -angiosperms
• Seeds may be “naked” - gymnosperms
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Gymnosperms (“naked seeds”)
• Division Cycadophyta• Division Gingkophyta• Division Gnetophyta• Division Coniferophyta
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Gymnosperms – conifers (cone bearers)
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Angiosperms -
(Carpel)
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Angiosperms can be either Monocots or Dicots
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Stoma – leaf opening for transpiration
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Types of plants summary
1. Mosses- Non vascular, seedless
2. Ferns-vascular, seedless
3. gymnosperms (cone bearers)-vascular, naked seeds
4. angiosperms (flowering plants)-vascular, seeds surrounded by fruit
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