The cards Question What is photosynthesis? Tap to flip Answer The process producers use to make their own food through a series of chemical reactions. Question In science, what does a rate measure? Tap to flip Answer How much change happens per unit of time. Question What is a limiting factor in photosynthesis? Tap to flip Answer A condition that, when in short supply, slows down or limits the rate of photosynthesis. Question What is an enzyme? Tap to flip Answer A biological catalyst that speeds up a chemical reaction without being used up itself. Question What is meant by the optimum conditions for a reaction? Tap to flip Answer The conditions at which the maximum rate of reaction occurs. Question Give one factor that the rate of photosynthesis depends on. Tap to flip Answer Any one of, e.g., light, chlorophyll, water, temperature or carbon dioxide. Question How does raising the temperature up to the optimum affect the rate of photosynthesis? Tap to flip Answer It increases the rate. Question Why does a rise in temperature up to the optimum speed up photosynthesis? Tap to flip Answer There are more collisions between enzymes and their substrates. Question What happens to the rate of photosynthesis above the optimum temperature? Tap to flip Answer It decreases. Question Why does the rate of photosynthesis fall above the optimum temperature? Tap to flip Answer The enzymes are denatured. Question How does increasing carbon dioxide concentration affect the rate of photosynthesis up to the optimum? Tap to flip Answer It increases the rate. Question When carbon dioxide concentration is at the optimum for photosynthesis, what is true of the enzymes' active sites? Tap to flip Answer They are all full. Question Can more than one factor influence the rate of photosynthesis at the same time? Tap to flip Answer Yes; several factors, such as light intensity, carbon dioxide concentration and temperature, can act together. Question What gas does pondweed release as a waste product when it photosynthesises in the light? Tap to flip Answer Oxygen. Question What is light intensity? Tap to flip Answer The amount of light reaching a given surface area in a period of time. Question What is a hypothesis? Tap to flip Answer An idea, for example about the outcome of an experiment, based on observations and understanding. Question What is a variable in an experiment? Tap to flip Answer A factor that can be changed during the experiment. Question What is a control variable? Tap to flip Answer A factor that is kept the same during an experiment. Question In an investigation of how light intensity affects photosynthesis in pondweed, what is the independent variable? Tap to flip Answer Light intensity. Question Give one factor that should be controlled when investigating how light intensity affects photosynthesis in pondweed. Tap to flip Answer For example, temperature. Question Give one way to measure the dependent variable when investigating photosynthesis in pondweed. Tap to flip Answer Either counting the bubbles or measuring the volume of gas given off. Question When is a measurement result considered accurate? Tap to flip Answer When it is judged to be close to the true value. Question In measurement, what does an error do? Tap to flip Answer It makes measurements differ from what they would otherwise be (the true value). Question In a set of results, what is precision? Tap to flip Answer The spread of the results around the mean value. Question What does it mean for measurements to be repeatable? Tap to flip Answer They are similar when repeated by the same person or group using the same equipment and method. Question What does it mean for results to be reproducible? Tap to flip Answer Similar results are obtained when another person or group repeats the investigation using different equipment. Question Which two types of error could affect the accuracy of measurements in the pondweed light-intensity investigation? Tap to flip Answer Systematic error and random error. Question What requirement of photosynthesis explains how pondweed results change with light intensity? Tap to flip Answer Photosynthesis requires light. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage GCSE (Years 10–11) Course GCSE Biology Unit Photosynthesis: factors affecting the rate Exam boards AQA, Edexcel, OCR Tiers foundation and higher England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
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A Biology lesson by Oak National Academy licensed under Open Government Licence (OGL)
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