BIO 111 lecture 7

BIO 111 lecture 7 - Where did seeds evolve? BIOL 111...

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1 1 Lecture 7 Plant structure, growth, 22 September 2009 BIOL 111 – Organismal Biology 2 Where did seeds evolve? Liverworts Hornworts Mosses Club mosses Horsetails Whisk ferns Ferns Gymnosperms Angiosperms A B C D E F G 6% 5% 6% 7% 20% 1% 51% 5% A B C D E F G H A H A B C D E F G H 3 Where did tracheids evolve? Liverworts Hornworts Mosses Club mosses Horsetails Whisk ferns Ferns Gymnosperms Angiosperms A B C D E F G 5% 8% 11% 22% 37% 5% 7% 6% A B C D E F G H A H A B C D E F G H 4 Where did a waxy cuticle evolve? Liverworts Hornworts Mosses Club mosses Horsetails Whisk ferns Ferns Gymnosperms Angiosperms A B C D E F G 14% 9% 13% 7% 30% 10% 9% 10% A B C D E F G H A H A B C D E F G H 5 Where did flowers evolve? Liverworts Hornworts Mosses Club mosses Horsetails Whisk ferns Ferns Gymnosperms Angiosperms A B C D E F G 1% 2% 2% 2% 3% 2% 21% 66% A B C D E F G H A H A B C D E F G H 6 Angiosperm diversity 97% of angiosperms are either monocots or eudicots.
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7 Two major groups of angiosperms 8 Plants are composed of two systems: 1. Shoot system: stems, leaves, buds, flowers photosynthesis 2. Root system absorption, anchor, storage bud = embryonic shoot (flower or leaf) 9 Root system: Types differ between eudicots and monocots. taproots eudicots fiberous roots monocots adventitious roots in corn (monocot) 10 Shoot system: Stems are modified for different functions. (leaves) 11 Shoot system: Leaves are the primary site of photosynthesis. 12 Plants are composed of 3 tissue systems: 1. vascular tissue system xylem tissue phloem tissue 2. dermal tissue system epidermal tissue
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This note was uploaded on 10/16/2009 for the course BIOL BIOL111 taught by Professor R during the Fall '09 term at McGill.

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BIO 111 lecture 7 - Where did seeds evolve? BIOL 111...

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