CH 229 Flashcards

(11 cards)

1
Q

When did plants colonize land?

A

475 mya

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2
Q

Plant species

A

300,000 living spp. in almost all environments

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3
Q

Multicellular photoautotrophs

A

-chloroplasts with chlorophyll and other pigments
-celulose cell walls
-store starch for energy

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4
Q

What is the closest relative to plants?

A

Charophytes

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5
Q

Plants & Charophytes Shared Traits

A

-ring shaped complexes for cellulose synthesis
- structure of flagellated sperm
-& dna

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6
Q

What is sporopollenin?

A

-in spores & pollen
-prevents desiccation
-allows permanent terrestrial lifestyle

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7
Q

Benefits of land

A

-lots of light, CO2, soil nutrients
-few competitors & predators

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8
Q

Adaptations to land

A

-to absorb and transport water & minerals: roots and vascular tissue in some
-cuticle and stomata to prevent water loss
- to aid in repro success: spores and pollen, flowers, fruits, and seeds in some
-alt of gen

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9
Q

4 traits absent in Charophytes

A

-alternation of generations
-walled spores produced in sporangia
- multicellular, dependent embryo
-apical meristems

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10
Q

Apical meristems

A

Continual growth in stem and root of apical meristems that differentiate into tissues and organs

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11
Q

Non vascular seedless and & seedless vascular plants are monophyletic groups: true or false

A

false

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