Class Notes (811,692)
Canada (494,876)
Biology (Sci) (2,418)
BIOL 111 (283)
Multiple (19)

September 25.doc

7 Pages
Unlock Document

Biology (Sci)
BIOL 111

Bio 111 Alanna Houston September 25, 2007 PLANTS - Advanced green algae are ancestors of plants o All green algae have:  Photosynthesis with chlorophyll a,b  Cellulose cell walls  Haplodiploid – haploid dominant o Pair of advanced groups jointly have:  Multicellular thallus growth form  Antheridium and oogonium protect gametes  Sporophyte (diploid) is • Single celled • Matrotrophic (= mother eating) nd o 2 picture on this slide: open cell on the left is a reproductive organ. The big circle in the middle is the diploid stage (living on a haploid – matrotrophic) The new haploid organism looks like the first picture. o o Bottom picture is the female reproductive organ (top) and male reproductive organ (bottom) - Onto land o Freshwater algae o Lived in ponds that dried out periodically o Evolved ability to stay active during dry periods Bio 111 Alanna Houston o Challenges for moving onto land:  Resisting gravity  Dealing with UV  Can’t swim  Nutrients don’t circulate  Light changes colour  Drying out - Liverworts: - like advanced algae o thallus o haploid dominant (sporophyte – diploid – matrotrophic) o Gametes flagellate and require water to swim (similar to amphibians) - but different o Cuticle (waxy coating on surface allows retention of water o Rhizoid (= quasi root) o Sporophyte multicelled o Oogonium – archegonium (truly distinct sterile jackets) o Gemma cups for asexual reproduction o Mosses: Bio 111 Alanna Houston - Still needs water to reproduce o Low mat growth form (3-10 cm) - Add o More complex sporophyte (capsule + operculum (lid))  Still matrotrophic o Stomata o Advanced mosses have a vascular system  Different structure than vascular plants - Bryophytes (= moss plant) includes liverworts, hornworts, mosses - Vasculature – tracheids: - Able to transport water and nutrients - Formed from cell that lays down strong cell wall with pits then dies o Water flows through where cytoplasm was - Very early on added lignin to wall giving stiffness for support - Early Vascular Plants: - All now extinct o Don’t know life cycles
More Less

Related notes for BIOL 111

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.