For example, read the concept map as follows, "Respiration takes place in all organisms. Variegated leaves have white patterns (areas lacking chlorophyll) on them. Use the iodine starch test identify which banana, the ripe or the unripe one, contains the most starch. Cellular respiration cannot occur without photosynthesis, and photosynthesis certainly cannot occur without the help of its partner. There are two parts to this investigation. Learners need to apply what they have learnt in Part 1 to plan their own experiment in part 2 and write up an experimental report. Browse . Those that did not receive radiant energy did not photosynthesise so they tested negative for starch presence (iodine solution remained yellow-brown). This was done to allow some plants to photosynthesise and the others not. The plant converts the glucose to starch as it is easier to store. He was scared that his little brother would knock his tub over, so he hid the tub in his cupboard. Although the Sun provides us with both light and warmth, plants only use the light energy from the Sun to photosynthesise. Why do you think the plant might need to store some glucose? You also need to fill this in. You table should highlight the differences in requirements, the differences in the products, which organisms the processes takes place in, and when. They will study physiological respiration in Gr. Post the equations of these processes where the students can see them. 9. You should use this comparison to help learners understand that reliability of an experiment rests on the fact that although different people perform the same test they should all reach very similar results. Let's find out! For example, the temperature of the water will affect the rate at which it dissolves, as will the quantities used, etc. As an introduction teachers may want to watch or show the following video to the class: These tables and how to use them are explained in the Teachers' Guide Overview at the front of the book. This teacher's guide contains the full version of each concept map. What do you wish to establish by conducting this investigation? Practice: Free energy, photosynthesis, and cellular respiration. ... What is a requirement for accurate measurements of the rate of respiration using a respirometer? According to my reading, energy is the strength and vitality to sustain physical or mental activity as it relates to humans (McKean, 1995).Energy is intertwined in all living things because plants are eaten by herbivores, and meat eaters or carnivores eat herbivores and other animals. Real understanding and knowledge comes from grappling with the subject matter, and not just memorizing facts. Find out why plants that photosynthesise are green. Photosynthesis and Respiration are two different natural processes and are working complementary somehow. So, chemiosmosis occurs during cellular respiration, but did you know it also happens during photosynthesis (the process of converting light energy into chemical energy… This is a written summary where the information from this chapter is summarised using words. Learners should be able to describe the taste and texture of each banana: the ripe one being soft and sweet, and the unripe one being firm and not too sweet. Help your learners to understand and "read" the concept maps by constructing sentences from them. Photosynthesis is the procedure in which green plants use sunlight, carbon dioxide and water to make food and oxygen and cellular respiration is the process where cells use this food to release stored energy. You simply need to type this whole link into the address bar in your internet browser, either on your PC, tablet or mobile phone, and press enter, like this: It will direct you to our website where you can watch the video or visit the webpage online. These mechanisms are called metabolism. 3. Breathing is the act of inhaling and exhaling air into and out of the lungs. PLAY. Their interaction extends to photorespiration, which is linked to optimize photosynthesis. Why did they run the rubber tube from Test Tube A to Test Tube B? Place half of the plants in the dark for at least 24-48 hours and the others in a well-lit area of the class that is exposed to lots of natural sunlight. Attach a rubber tube to the front of a syringe. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water. This is an optional extension of the starch test. We will learn more about the whole respiratory system next year in Gr. What are the requirements for photosynthesis to occur? When this fuel is burned in the presence of oxygen, the chemical potential energy is transferred into light and heat energy. This specific point was included to allow teachers to reinforce this rule with learners and that we only ever do a taste test if we are sure that a substance is in fact edible. Quiz not found! The initial explanation is simple and appropriate for this grade level but it might show some of the more inquisitive learners what actually happens during the 3 stages of respiration. Photosynthesis usually results in a gain of glucose once respiration has been accounted for. Explain what he would have noticed a few days after planting the beans. 2. He should have put the plants in a place where they would get enough radiant energy (sunlight) to allow them to photosynthesise. Matter is cycled through a system, and energy flows through a system using inputs and outputs. The processes of photosynthesis and cellular respiration are linked to each other. Photosynthesis is the process in which chlorophyll molecules absorb the radiant energy from the sun and transfers it into chemical potential energy. Gravity. Plants change the glucose that they produce into starch that can be stored more easily. Thus, the energy used is 9 × 50, or 450 kcal per mole of oxygen evolved. Figuring out the study method that works best for you, and developing these skills is very useful, especially for later in high school and after school! What does this mean? Thus, the energy used is 9 × 50, or 450 kcal per mole of oxygen evolved. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. We will place some pot plants in the light for a day, and some other pot plants in a dark cupboard for a day, and then perform the investigation on the leaves of plants from both groups. (water), etc. Photosynthesis and Respiration. 2. Learners should explain anything that they might have improved on in their results. Explain what the results of the iodine test indicates. The process releases oxygen. Cell Energy (Photosynthesis and Respiration) Notes I. This is glucose, which can then be modified and combined with other glucose molecules to be stored as starches and complex sugars like fructose. Differentiate photosynthesis and respiration in terms of cell structures involved, raw materials, end product and energy requirement. Spell. As air contains such a small percentage of carbon dioxide, there is not enough to cause a noticeable difference in the limewater. Glucose is also converted into other chemical compounds that enable processes in the plant such as reproduction and growth. pyruvic acid. Part 2 : Which parts of variegated leaves photosynthesise? Place this rubber tube into the beaker marked AIR and push out the air inside the syringe slowly and carefully into the limewater as shown in the diagram. Discuss this as a class in the lead up to the investigation. Study the following properties of starch and glucose with your class. The plant cannot have large amounts of glucose accumulating as this affects the water potential within the leaves, and so some is converted to starch to be stored until it is needed. 10. Hence in photosynthesis you have the light dependent reactions and the dark reactions while in respiration there is aerobic respiration and anaerobic respiration. We call it a by-product as it is not the main product that is wanted from the process. High initial rates of gas-exchange in respiration and photosynthesis of Chlorella. Let's find out why. You need to look at what concepts link from these in order to know where to put each one. You can also link back to this example of a chemical reaction (actually a series of reactions), when introducing the topic next term. Look at the following diagram which summarises the process of photosynthesis. Log in Sign up. Photosynthesis Respiration Basis of Comparison Location Starting raw materials End products Energy requirement 1. Mitochondrial respiration appears to be critical for the provision of ATP necessary for energy demanding processes in the light. Glucose will dissolve in water while starch will not dissolve in water. Learners should be able to quite easily see this based on the speed with which the iodine changes colour in the unripe banana. Then the leaf must be placed in alcohol and this is heated over water to remove the chlorophyll. Photosynthesis produces the oxygen to replenish oxygen that is used up by living organisms during respiration. What are the by-products in respiration? Its by-product is oxygen, which is essential for cellular respiration. The yeast needs to act on the sugar to form the carbon dioxide. For now, let's use this test to show that our breath contains carbon dioxide. They can then indicate the results on the drawings. Pharmacies are generally quite helpful and will assist schools in purchasing low cost syringes. We want to find out which parts of these leaves photosynthesise in this part of the investigation. 3. 4. The relationship between photosynthesis and cellular respiration is such that the products of one system are the reactants of the other. a) Respiration b) Photosynthesis c) Photosynthesis and some respiration 4) When do plants photosynthesise? Below are some of the similarities and differences between these two systems. What is potential energy? Explain what you think happens to the starch as the bananas ripen. Have you ever wondered why fruit becomes sweeter as it ripens? The lower quantum requirement obtained at low light intensity is believed to be due to a relatively greater importance of contribution of energy from respiration to photosynthesis. Plants are able to photosynthesise because they contain chlorophyll, a green pigment that can capture light energy from the Sun. The chloroplast uses the energy harnessed from these photons and their interaction with the cytochromes and other proteins to drive the formation of glucose. •Photosynthesis= is a process by which a cell captures energy in sunlight and uses it to make food. Pour clear limewater into each beaker until they are half full. A group of Gr. Respiration is the metabolic process that uses oxygen to release energy and releases carbon dioxide as a by-product. Most organisms cannot directly use the energy from the sun to perform the seven life processes. It is a colourless gas, so we cannot see it directly. Notice what happens to the clear limewater. The essential requirement of this method is an instrument capable of measuring oxygen or C02 concentration and possessing a rapid response time. Photosynthesis & Respiration (Simulations) INTRODUCTION All living organisms have a constant energy requirement, and they have mechanisms to gather, store, and use energy. 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