3) Volcanoes gave out gases: CO2‚ water vapour and small amounts of other gases. (water and oceans formed) 4) The early atmosphere: mostly CO2‚ with no oxygen. 5) The oceans formed when the water vapour condensed. Phase 2- Green plants evolved and produced oxygen. 1) A lot of CO2 dissolved into the oceans. 2) Marine organisms developed which took some of this CO2. When they died the organisms were buried under layer of sediments and the CO2 became “locked up” in carbonate rocks
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in plants is a combination of (1) it’s tendency to move in response to differences in solute concentration and (2) the pressure exerted on it Plants do not expend energy to replace water that is lost to transpiration when stomata are open and photosynthesis is occurring. Instead‚ water moves from soil and roots to leaves long a water potential gradient. The gradient exists because water at the air0water surface in leaves in under negative pressure (tension) The phloem‚ sugars are transported from
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produce biofuel. Genetically modified blue and green algae could be the answer to the world’s fuel problems. Bioengineers have already developed algae that produce ethanol‚ oil and even diesel -- and the only things the organisms need are sunlight‚ CO2 and seawater. For reasons of data protection and privacy‚ your IP address will only be stored if you are a registered user of Facebook and you are currently logged in to the service. For more detailed information‚ please click on the "i" symbol. Biochemist
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Harnessing of Solar Energy: Photosynthesis versus Semiconductor Based Solar Cell Photosynthesis and semiconductor-based solar cells are both used to harness solar energy from the sun – photosynthesis for plants and semiconductor based solar cells for human beings. Photosynthesis consists of light reactions and dark reactions. It is a process in which carbon dioxide (CO2)‚ water (H2O) and light energy are utilized to synthesize an energy-rich carbohydrate like glucose (C6H12O6) and to produce
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Biology Midterm Outline Topics: * Topic One: Chemistry of Living Things (p2-4) * Topic Two: The Cell (p5-6) * Topic Seven: Evolution (p23-27) * Topic Ten: State Labs (37-40) Topic One: Chemistry of Living Things I. All living things must maintain homeostasis in order to stay alive. A) Homeostasis: A balanced state in an organism’s body. B) Failure to maintain homeostasis results in disease or death. C) Homeostasis is often maintained using feedback mechanisms. 1. Feedback mechanisms
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General Purpose: To persuade Specific purpose: After listening to my speech‚ my audience will know how they can change their lives for a bigger challenge – to save the world. Thesis: Knowing what a problem nowadays is global warming‚ how CO2 gas affects it and how can we change it. Title: Lifestyle to make some changes INTRODUCTION I. Attention Material: Question “Do you know that using cars for the
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Photosynthesis Photosynthesis is the process by which green plants manufacture their own food. This occurs in presence of sunlight and other raw materials‚ namely carbon dioxide and water. The chlorophyll pigment harvests the light energy from sunlight‚ which is then converted into glucose by the phenomenon of photosynthesis. In short‚ it is the opposite of aerobic respiration. The equation for photosynthesis is: 6 CO2+ 6 H2O + Light energy → C6H12O6 + 6
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|Describe the mechanism of breathing -- how we inhale and exhale air | | |Give the role of the diaphragm‚ the intercostal muscles and brain (exclude CO2‚ levels) in breathing | | |Explain pressure changes in the thoracic cavity during breathing | |
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carbon suspended in the air‚ produced as a result of burning coal and oil. While smoke remains in the air‚ it can reduce the light intensity at ground level; hence reduce the overall rate of photosynthesis. Deposits of smoke‚ or more particularly‚ soot and ash‚ may coat plant leaves directly reducing photosynthesis by preventing light penetration or even by clogging stomatal openings. The pollutants involved in acid rain are sulphur dioxide‚ oxides of nitrogen‚ ozone and various volatile organic vapours
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Chapter 1 * animal Multicelled consumer with unwalled cells; develops through a series of stages and moves about during part or all of the life cycle. * archaean Member of a group of single-celled microorganisms that superficially resemble bacteria‚ but are genetically and structurally distinct. * atom Particle that is a fundamental building block of all matter. * bacterium Single-celled organism belonging to the Domain Bacteria; cells are typically walled and do not
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