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Feb05Lec - Photosynthesis How Plants Make The Food We Eat...

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" 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 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 Last Lecture Covered : Foods and nutrition and the discovery of vitamins C, A, B1 and B3 Today’s Lecture : The food supply Photosynthesis: The source of all foods, chemical energy and oxygen (ppt SERIES) Thomas Jefferson was interested in the Agricultural Foundations of the US. ! Photosynthesis is the foundation of our food supply (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.
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# (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 Populations would, therefore, outgrow food supply – unless population growth is checked (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) Why is applying the principle of symmetry so important in analyzing arguments? ! one should not assume that one’s position does not require scrutiny because it is based on the “truth” while the opponent’s position can only be explained by his or her character flaws, including covert political or economic interests. (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
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$ (ppt series) II. Land Use Approach Increase the proportion of land used for agriculture.
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