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RESPIRATION ARISTO

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Information about RESPIRATION ARISTO
Education

Published on January 28, 2008

Author: Michelino

Source: authorstream.com

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Slide2:  What is Respiration? a process of oxidizing food to release energy inside cells Slide3:  Burning of Food A demonstration of energy released from food Burning Slide4:  does not occur in living cells because the reaction is too fast and cells would die as they become so hot food(sugar) + oxygen Slide5:  Respiration reactions are catalyzed by enzymes main food substance which oxidized in cells is glucose C6H12O6 + 6O2 6CO2 + 6H2O + energy as it takes place in all living cells, it is called cellular respiration which is used to produce energy for cells to use Slide6:  Comparison of Burning and Respiration Similarities - both involve oxidative processes - both require the use of oxygen and food and they produce the same products of carbon dioxide and water - both reactions release energy Slide7:  Differences Slide8:  Differences Slide9:  To Demonstrate Heat Production by Respiring Animals using a Differential Air Thermometer Slide10:  What is the function of the clips ? Ans: To equalize the pressure on the two sides of the capillary tube. Slide11:  Why should the containers be wrapped in cotton wool ? Ans: It acts as an insulator to prevent heat loss. Slide12:  Which is preferable, a capillary tube with a wide bore or one with a narrow bore ? Ans: A capillary tube with a narrow bore is preferred than the wide one as it is more sensitive and will give better results. Slide13:  What happens to the levels of the coloured liquid ? Ans: The coloured liquid rises up the left arm of the U-shaped capillary tube. Slide14:  Why ? Ans: Because the mouse in container B carries out respiration to release heat energy which warms up the air in the test tube. Slide15:  To Demonstrate Heat Production by Germinating Seeds using Thermos Flasks Slide16:  Which thermos flask shows a higher temperature at the end of the experiment ? Ans: Flask A showed a higher temperature at the end of the experiment. Slide17:  Why ? Ans: It is because living seeds produce heat energy. Slide18:  What is the purpose of washing the seeds with a disinfectant ? Ans: To kill any bacteria and fungi present on the seeds. Slide19:  It is advisable not to fill the flasks completely with seeds. Why ? Ans: To provide air for the seeds to respire. Slide20:  Why are the flasks supported in the upside-down position ? Slide21:  Ans: The flasks are supported in the upside-down position because carbon dioxide, produced during respiration of the living seeds, is a heavier gas and may escape through the cotton wool. hot air rises up, and inverting it will ensure that heat will not escape through the cotton wool. it is easier to read the thermometer as the thermos flasks are not transparent. Slide22:  To Show Production of Carbon Dioxide by a Respiring Animal Slide23:  Why is it necessary to bubble the incoming air through potassium hydroxide solution before it is supplied to the mouse ? Ans: It is used to remove carbon dioxide in the incoming air. Slide24:  Which solution changes colour at the end of the experiment ? What does this show ? Ans: The lime water in flask C turns milky. It is because carbon dioxide is given off by the mouse. Slide25:  To Show the Release of Carbon Dioxide by Germinating Seeds Slide26:  Why is it necessary to wash the seeds with a disinfectant ? Ans: It is used to kill microorganisms. Slide27:  What is the function of the moist cotton wool inside the muslin bag ? Ans: It prevents the seeds from drying out. Slide28:  What has happened to the hydrogencarbonate indicator solution in the two tubes ? Ans: Indicator solution in tube A turns yellow while the indicator solution in tube B remains unchanged. Slide29:  What can be concluded from this experiment ? Ans: Carbon dioxide is released by the germinating seeds. Slide30:  Uses of the Energy Released during Respiration Human Other Animals Plants produce light in fireflies muscle contraction absorb mineral salts by active transport keep warm produce sound in some birds transport food substances absorb food by active transport produce smell in some mammals Slide31:  ATP energy is mainly released as heat and ATP during respiration in cells however, during respiration, some ATP should be consumed first before other ATP can be formed the ATP consumed is used to form other ATP from ADP and phosphate groups Slide32:  ADP + energy (from breakdown of glucose) + phosphate ATP is a high-energy compound while ADP is a low-energy one ATP can only store energy for a short period ATP is made inside organelles, mitochondria, which is scattered in the cytoplasm of a cell Slide33:  Anaerobic Respiration respiration in human is mainly aerobic respiration as oxygen is essential when oxygen is not needed during respiration, it is called anaerobic respiration yeast and muscle cells are examples which they can respire anaerobically for a short time Slide34:  Alcoholic Fermentation without oxygen, yeast cells respire as follows: C6H12O6 + energy + 2C2H5OH (ethanol) 2CO2 amount of energy released anaerobically is smaller when compared with the aerobic method Industrial Use of Yeast Fermentation:  Industrial Use of Yeast Fermentation alcohol produced is used for: brewing beer making wine carbon dioxide released is used for: baking bread Slide37:  Lactic Acid Fermentation extra oxygen is required for undertaking sternuous exercise Slide38:  lactic acid will cause muscle fatigue and muscle cramps if they are allowed to accumulate C6H12O6 2C3H6O3 + energy Slide39:  a large amount of oxygen is needed to break down the accumulated lactic acid into carbon dioxide and water or turn to glycogen in liver for storage so we pant after doing exercise the amount of oxygen required to get rid of lactic acid is called oxygen debt Slide40:  To Show Anaerobic Respiration of Germinating Seeds in Oil Slide41:  Does the boiling tube contain a gas after 2 days? Ans: Yes. Slide42:  What happens to the hydrogencarbonate indicator solution when the gas is bubbled through it? Ans: The solution turns yellow. Slide43:  What is the gas produced? Ans: It is carbon dioxide. Slide44:  What can be learned about the respiration of germinating seeds from this experiment? Ans: Germinating seeds can respire anaerobically and release carbon dioxide in the absence of oxygen. Slide45:  To Show Production of Ethanol and Carbon Dioxide during Fermentation of Glucose by Yeast Slide46:  Why is it important to boil the glucose solution? Ans: This drives off any dissolved oxygen. Slide47:  Why must the glucose solution be cooled down before yeast is added? Ans: It is because yeast would be killed when hot. Slide48:  What is the function of liquid paraffin? Ans: It prevents the mixture from coming into contact with air. Slide49:  What has happened to the hydrogencarbonate indicator solution? Ans: The hydrogencarbonate indicator solution has changed from red to yellow. Slide50:  What does this show? Ans: This shows that yeast can respire anaerobically to produce energy. Slide51:  What has happened to the reading of each thermometer? Ans: The reading of the thermometer of the experimental set-up rises. Slide52:  At the end of the experiment, what new substance would you expect to find in the glucose solution containing living yeast? Ans: We can find alcohol in it. Slide53:  Comparison of Aerobic and Anaerobic Respiration Similarity Sugar is broken down to release energy ATP is made Both are controlled by enzymes Slide54:  Differences Slide56:  Differences between Respiration and Photosynthesis

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