Surname Centre Number Candidate Signature Other Names Candidate Number Leave blank General Certificate of Education June 2004 Advanced Level Examination BIOLOGY/HUMAN BIOLOGY (SPECIFICATION A) Unit 5 Inheritance‚ Evolution and Ecosystems Tuesday 22 June 2004 Morning Session No additional materials are required. You may use a calculator. BYA5 For Examiner’s Use Number 1 2 Mark Number Mark Time allowed: 1 hour 30 minutes Instructions • Use blue or black ink or ball-point pen. • Fill in the boxes
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Determination of Phosphorus Content of Fertilizer: Skill Building Lab © 2011‚ Sharmaine S. Cady East Stroudsburg University Gravimetric Analysis Skills to build: Using vacuum filtration Using a digital balance Using mass stoichiometry Doing a gravimetric analysis Fertilizer Scientists estimate that the earth ’s soil contains less than twenty percent of the necessary organic nutrients needed to meet our current food production. Carbon‚ hydrogen‚ and oxygen used to synthesize
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Cells‚ Cell Division‚ and Cell Specialization Fundamentally Different Types of Cell Prokaryotic Cell- single celled: only DNA+ structure (“before nucleus”) E.g. zygote-complete DNA Eukaryotic Cell-multi-celled (“after nucleus”) Prokaryotes Eukaryotes DNA In “nucleoid” region Within membrane-bound nucleus Chromosomes Single‚ circular Multiple‚ linear Organelles None Membrane-bound organelles Size Usually smaller Usually larger- 50 times Organization Usually single-celled Often multicellular
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The Calvin Cycle Plants use energy from the sun in tiny energy factories called chloroplasts. Using chlorophyll in the process of photosynthesis‚ they convert the sun’s energy into storable form in ordered sugar molecules such as glucose. In this way‚ carbon dioxide from the air and water from the soil in a more disordered state are combined to form the more ordered sugar molecules. Carbon dioxide is captured in a cycle of reactions known as the Calvin cycle or the Calvin-Benson cycle after
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living conditions change to being unfavorable. Plants are dependent on photosynthesis for survival‚ to help them with the process of transpiration. Under a microscope we can see that plant cells have cell walls that are filled with chloroplast and chlorophyll‚ which is the method for gaining nutrients and performing transpiration. Plants are also identified by their ability to carry out alternation of generations‚ which means that plants are capable of performing both mitosis and meiosis in order to
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phloem cells‚ which move food. Third is the leaves‚ which are the food making factories of the plant. Leaves come in a variety of sizes‚ and can be simple or compound. Photosynthesis takes place in the leaves‚ where it uses carbon dioxide‚ water‚ chlorophyll and light energy to create food for the plants and oxygen for other living life forms. In fourth are the flowers; their purpose is all about reproduction‚ pollination‚ and seed development. Flowers contain both male and female parts: the carpel
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Factors Limiting Photosynthesis The rate of photosynthesis increases with increasing light intensity. But too much light intensity can slow down the rate of photosynthesis because the light damages chloroplasts in the leaf. The higher the temperature the greater the rate of photosynthesis as photosynthesis is a chemical reaction and chemical reactions increase with temperature. But at temperatures above 40 C the rate slows down because the enzymes involved are destroyed
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Kobayashi‚ H. (1985) 15N study on the fate of foliarly applied urea nitrogen in tea plant. Soil Science and Plant Nutrition‚ 31(1)‚ 123-131. 13. Krishnapillai‚ S and Ediriweera‚ V.L. (1986). Influence of levels of nitrogen and potassium fertilizers on chlorophyll content in mature clonal tea leaves. Srilanka Journal of Tea Sciences‚ 55(2)‚ 71-76. 14. Malenga‚ N.E.A. (1985) Response of young clonal tea to nitrogen. Quarterly Newsletter‚ Tea Research Foundation (Central Africa) (79)‚ 7. 15. Malenga‚ N.E
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Energy in Cell Virtual Lab - Week 3 NAME: ________________________________________ 1. What is the importance of the light and dark reactions in photosynthesis? Photosynthesis works by absorbing light. Our sun gives off energy and the chlorophyll from the plant absorb this energy. The energy is then used to separate water into hydrogen and oxygen and then they combine hydrogen and carbon dioxide to make sugars. 2. What happens to food energy during photosynthesis? During cellular
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INVESTIGATE A FACTOR AFFECTING THE RATE OF PHOTOSYNTHESIS. Introduction Photosynthesis is a chemical reaction which takes place inside the green plants (plants with chlorophyll‚ a pigment found in chloroplasts which causes the colour of the plants and it is the main photosynthetic pigment) and light energy is converted into chemical energy. Carbon dioxide‚ water and sunlight is transformed into sugar an oxygen‚ which later will be used as energy for the plant. The chemical equation of photosynthesis
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