Lecture #6 - Cognitive Science Research Day When: Wed,...

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1 Cognitive Science Research Day Cognitive Science Research Day When: Wed, September 22, 2010 10:30am – 4:00pm Where: Lev Buhkman (SSMU) What: Cognitive Science profs presenting their innovative research. Why: Opportunity to learn and perhaps get involved in research. Free lunch where you can speak to the profs.
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2 Learning to Learn Save time by studying smart What: A 2 Ͳ hour workshop on studying more efficiently Where: Chancellor Day Hall (Law) Room 200 When: Wednesday September 22 nd 5 Ͳ 7 pm How: First come first serve (50 people limit) What to bring: Clickers ( if you have one), pen/pencil, ID
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3 Evolution of Land Plants Biol-111 (2010) – Lecture 6 Rajinder Dhindsa
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4 Living in water, what do organisms get from their surroundings? A partial list of necessities of life and how a plant living in water fulfills them. What challenges a plant on land would face in fulfilling the same necessities.
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5 Structural changes needed: 1. to avoid dehydration of the body – waxy covering (cuticle) 2. to obtain water and nutrients from the soil and means to distribute them to all parts of the body – roots, shoots, stomata etc, vascular system. 3. to benefit from higher intensity of light on land – increased photosynthetic surface area – leaves with increased surface area 4. Mechanical strength to support their body mass – specialized with thick cell walls, e.g. xylem vessels, tracheids, fibers, phloem sieve elements colenchyma, sclerenchyma. 5. Apical growth and branching to achieve maximum growth.
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6 6. With respect to reproduction: i) Protect gametes, zygote and embryo from dehydration – archegonium, antheridium, protected embryo, seed ii) Retention of egg on the mother plant. iii) Mechanisms to transfer male gamete to the female gamete – pollination and pollination vectors. 7. to cope with possible environmental stresses – evolve pigments to cope with increased UV light on land. Clicker question next !
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7 If density of water is 1.0 and that of human body is 1.1. How much of his weight would a 100-kg man would have to support in water? Ap p ro x i m a t e ly 9 kg Approximat ly 1 k g App xim ly 9 0 k I don’t know 0% 0% 0% 0% 1. Approximately 9 kg 2. Approximately 1 kg 3. Approximately 90 kg 4. I don’t know 0 of 650 20
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8 A body density of 1.1 implies that a 100 kg man has an approximate volume of 91 liters. On complete submersion in water, his body
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This note was uploaded on 10/05/2010 for the course BIOL BIOL 111 taught by Professor Roffey during the Fall '09 term at McGill.

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Lecture #6 - Cognitive Science Research Day When: Wed,...

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