BIO120H1 Lecture : Bio lab 12 Feb 2 2010

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BIO120H1 Full Course Notes
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BIO120H1 Full Course Notes
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Early atomphere is rich in hydrogen, sulphur and nitrogen, until the evolution of photosynthetic organisms that were capable to of: dzl2 zlzl2 . 2lk : releasing oxygen in the process. A protective layer ozone began to form to protecing the terrestrial life from the ultraviolet rays of the sun. Photosynthesis, through the release of oxygen into the atmosphere, created a more hospitable environment. Major groups: bryophytes j lack trie vascular tissues. Tracheophyte j have treu roots, stems and leaves as well as vasular tissues. Both groups lifecycle consists of an alternation between a diploid sporophyte generation and a haploid gametophyte generation. Design of plant body compromise of 2 parts j requirement of photosynthesis (max surface area to absorb light energy and carbon dioxide) and the requirement of reducing the evaporation of water (min surface area) Part of the descendant species adapt to new habitate, result in two different species j divergent evolution.

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