Plant Diversity I: How Plants Colonized Land
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1.For much of Earth's history, the land surface was largely
vb vb vb vb vb vb vb vb vb vb . Some
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lived on land 3.2 billion years ago, but it was only within the last 500 million y
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ears that vb vb
plants, fungi, and animals joined them ashore. Finally, by 385 million years ag
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o, the first appeared (but with different
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than those of today): Lifeless; prokaryotes; small; forest; species
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2.Plants evolved from : Green algae vb vb vb vb vb
3.Plants Evolved from Green Algae vb vb vb vb
There are more than 325,000 known vb species today; most live on
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: Plant; land vb vb
4.Plants Evolved from Green Algae vb vb vb vb
Plants supply , sources, and vb for many other terrestrial organisms- vb vb vb vb vb vb vb vb
: Oxygen; food; habitat
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5.Plants Evolved from Green Algae vb vb vb vb
Green algae ( protists) called vb are the closest relatives of plants: Pho-vb vb vb vb vb vb vb vb vb
tosynthetic; charophytes
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6.Evidence of Algal Ancestry vb vb vb
Plants and some algae are , , photosynthetic
vb : Multicellular; euka
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ry- otic; autotrophsvb vb
7.Evidence of Algal Ancestry vb vb vb
Some algae, like plants, have in their cell walls and
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a and b: Cellulose; chloroplasts; chlorophyll
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8.Evidence of Algal Ancestry - Shared Traits Between Plants and Charo- vb vb vb vb vb vb vb vb vb vb
phytes
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-synthesizing membrane proteins are arranged in vb vb vb vb vb vb
, rather than linear sets: Cellulose; rings
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9.Evidence of Algal Ancestry - Shared Traits Between Plants and Charo- vb vb vb vb vb vb vb vb vb vb
phytes
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Sequence similarities in , , and vb vb vb vb vb vb
DNA: Nuclear; chloroplast; mitochon- drial vb vb vb vb
10.Evidence of Algal Ancestry - Shared Traits Between Plants and Charo- vb vb vb vb vb vb vb vb vb vb
phytes
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Structure of : Flagellated sperm vb vb vb vb
11.Evidence of Algal Ancestry vb vb vb
Recent genetic analysis indicates in the clade
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, Chapter 29 - vb vb
Plant Diversity I: How Plants Colonized Land
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are the closest living relatives of plants: Charophytes; Zygnematophycaea
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12.Evidence of Algal Ancestry
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Plants are not descended from
vb vb vb charophytes, but share a vb vb vb vb vb vb
with them: Modern; common ancestor
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, Chapter 29 - vb vb
Plant Diversity I: How Plants Colonized Land
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13.Adaptations Enabling the Move to Land Char vb vb vb vb vb vb
ophytes have a coating of : Sporopollen
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in
14.Adaptations Enabling the Move to Land vb vb vb vb vb
Sporopollenin: A polymer that prevents zygotes from drying out vb vb vb vb vb vb vb vb
15.Adaptations Enabling the Move to Land Sporopolleni vb vb vb vb vb vb
n is also found in plant
vb vb vb : Spore wall vb vb vb vb vb
s
16.Adaptations Enabling the Move to Land vb vb vb vb vb
The move to land provided benefits:
vb sunlight, more plentiful
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vb
- soil: Unfiltered; CO2; nutrient-rich vb vb vb
17.Adaptations Enabling the Move to Land vb vb vb vb vb
Land also presented challenges: a scarcity of
vb and lack of
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support against vb vb
: Water; structural; gravity vb vb vb
18.Adaptations Enabling the Move to Land vb vb vb vb vb
Plants as adaptations evolved that enabled them to thrive on
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despite challenges: Diversified; land vb vb vb
19.Adaptations Enabling the Move to Land vb vb vb vb vb
The placement of the boundary dividing
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is the subject of ongoing debate: Plants; algae
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20.Adaptations Enabling the Move to Land vb vb vb vb vb
The traditional definition equates the kingdom
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(plants with embryos): Plantae; embryophytes
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21.Derived Traits of Plants vb vb vb
What are the four key traits that appear in nearly all plants but are absent in the
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charophytes?: - Alternation of generations
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- Multicellular, dependent embryos vb vb
- Walled spores produced in sporangia vb vb vb vb
- Apical meristems vb
22.Derived Traits of Plants vb vb vb
Alternation of Generations: Type of plant life cycle consisting of multicellular
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forms that give rise to each other in turn; the life cycles of plants alternate
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between two generations of multicellular organisms: gametophytes and
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sporophytes
23.Derived Traits of Plants - Alternation of Generations vb vb vb vb vb vb vb
The multicellular haploid
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