Lecture 6 Notes - Transcription of Dr Wayne`s Lecture...

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2/2/07 Transcription of Dr. Wayne’s Lecture Photosynthesis: How Plants Make The Food We Eat. Study Hint : Reminder. Use the study questions that Allen & Randy post on Blackboard to help you study J Clicker Question: Beriberi is a disease caused by: 1. The bacterium Bacillus beriberis 2. A deficiency of thiamin, vitamin B1 [correct answer] 3. Too much ignose and not enough godnose 4. A toxin in the endosperm of rice 5. A deficiency of vitamin A Note: Vitamins were presented in chronological order as well as their numerical order. Use this fact to help you study. Last Lecture Covered : Foods and nutrition Today’s Lecture : Photosynthesis- The source of all foods and chemical energy (ppt) Civilization is dependent on, and therefore shaped by the availability and type of adequate food supply. Dilemma faced by all civilizations is how to achieve this via: Natural sciences Social sciences Recall there are different approaches one can take – thesis, antithesis, or combining the two via synthesis. (ppt) What determines the availability of food? The Sun is the ultimate (primary) source of energy for life on Earth. Plants are the ultimate (primary) source of food for life on Earth – because they can “capture” sun light energy Thomas Malthus (1798) concluded populations typically grow geometrically while the food supply tends to grow arithmetically o Populations would, therefore, outgrow food supply – unless population growth is checked 1
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2/2/07 Transcription of Dr. Wayne’s Lecture (ppts) How can we ensure an adequate food supply for humans? There are four basic approaches: 1. Population and Life-style Approach 2. Land Use Approach 3. Chemical Approach 4. Biotechnological Approach (ppt) I. Population & Lifestyle Approach: decrease rate of population growth i.birth control ii.education decrease Ecological Footprint [this relates to the Carbon Footprint you calculated last semester] i.plants support more life than animals can [this is due to the loss of energy in the form of heat each time you move one consumer level away from the primary producer (plant) – see Laws of Thermal Dynamics. Therefore use organic farming [energetically more efficient to eat a cow that grazed, than one than was fed corn— corn produced through the burning of fossil fuels by tractors etc] & eat more plant matter than animal matter. ii.Eat more nutritious foods iii.Eat smaller portions (ppt series) II. Land Use Approach Increase the proportion of land used for agriculture. o However, this will occur at the expense of decreasing natural habitats 2
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2/2/07 Transcription of Dr. Wayne’s Lecture (ppt) III. Chemical Approach – to increase productivity of farmland Fertilizers first invented by Fritz Haber –provide nitrates & nitrites (“fixed” forms of nitrogen) found process used to fix atmospheric nitrogen [recall from lab, plants need fixed Nitrogen to run the light- independent reactions of photosynthesis] fertilizers increase the yield of crops (plants can make more glucose, and thus grow better)
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