Lecture+19+W+2012

Lecture+19+W+2012 - On the road to seeds Heterospory Seed...

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Unformatted text preview: On the road to seeds Heterospory Seed plant synapomorphies Secondary growth in vascular tissue Formation of bark Axillary branching Seeds Pollen Seed Plants groups Gymnosperms Angiosperms The Gymnosperms Lecture 19: Seed Plants Apical (tip) growth also known as primary growth occurs from division of a meristem cell or cells at the apex of the shoot or root. branches can arise from bifurcation of the tip (dichotomous) or from axillary meristems primary growth in vascular plants produces primary xylem and phloem (in addition to other tissue types) Seed Plants - Primary Growth Seed Plants Primary Growth Axillary bud between leaf and stem Axillary bud grows out into branch Increase in girth (width) known as secondary growth occurs through the production of more vasculature produced from a lateral meristem or cambium ancestral vascular plants can make more xylem but not more phloem in seed plants the vascular cambium is bifacial (two-faced) produces xylem (inside) and phloem (outside) Seed Plants- Secondary growth Seed Plants Secondary Growth Seed Plants Secondary Growth Seed Plants Secondary Growth Two Clicker Questions! Clicker Question Which of the following organisms would show this type of life cycle : A. Bryophytes B. Equisetum C. Selaginella D. A and B E. A, B and C Which of the following statements is INCORRECT ? A. The heterosporous life cycle is a form of alternation of generations B. Heterospory originated once in land plant evolution C. Heterospory involves separate male and female gametophytes D. Spores in heterosporous plants differ in size Clicker question: Heterospory On the road to seeds Heterospory Seed plant synapomorphies Secondary growth in...
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Lecture+19+W+2012 - On the road to seeds Heterospory Seed...

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