Answer: (1) I will select white light because photosynthesis is maximum in white light while it is minimum in green light as green light is reflected by green plants. 6CO2 + 6H2O — > C6H12O6 + 6O2. 5. The conversion of physical energy of light into chemical energy by the chloroplast is called Photophosphorylation. So, during day time photosynthesis and stomatal transpiration occurs simultaneously. Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later used to fuel cellular activities. The various processes resulting in the circulation of carbon in different forms constitute the carbon cycle. 9. Answer: The chlorophyll traps solar energy and converts it into chemical energy. The potted plant was then placed in sunlight for a few hours. Leaves are broad and flat to increase the surface area for photosynthesis. Glucose 9. (Photon) 3. The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen. 14. 5. Answer: See figure. Xanthophyll is Yellow coloured pigment. KOH absorbs CO2. 3. Grana, Thylakoid, Stroma, Root. Phosphorylation: The covalent attachment of a phosphate group to a molecule. (iv) Describe step by step how the candidate proceeded to test the leaf for the presence of starch. Photosynthesis is a process by which plants prepare food. Photosynthesis process can be represented by a chemical equation. Question 4: The figure below represents an experiment performed to demonstrate a particular aspect of photosynthesis. (False, Respiration occurs in all the cells of a plant.) Stroma. Answer: (i) Photosynthesis. Keywords: Photosynthesis, Photosynthesis Equation, Raw materials for Photosynthesis, Site of photosynthesis, Autotrophic nutrition. 230-250 molecules of chlorophyll make one quantasome. ATP 2. A simple way to explain photosynthesis for kids is by … (iii) Photosynthesis. Light in which maximum rate of photosynthesis takes place. 5. 1.Photosynthesis 2.Photosynthesis Overview 3.Discovery of Photosynthesis 4.Why is Photosynthesis important? (True) 10. Leaf B and Leaf C will turn blue-black. 3. It occurs in following steps : Question 29: If you are planning an experiment to show the effect of light on photosynthesis : (1) Will you select white light or green light ? 4. Photosynthesis is responsible for the presence of oxygen in our atmosphere. PhotoLysis is the reaction which means the breaking up of water molecules. 8. Answer: Question 4: Autotrophs and Heterotrophs. Insert one of its leaves in a conical flask, which contains potassium hydroxide. The apparatus was kept in sunlight for almost the whole day. Answer: (i) In the cell organelle called plastids (or chloroplasts). ICSE Class 10 Biology Chapter 6 Photosynthesis Revision Notes by Swiflearn are so far the best and most reliable Revision Notes for ICSE Class 10 Biology. (b) I will select destarched plant so I can demonstrate the synthesis of starch through iodine test. (Chlorophyll), 1. Organisms which cannot prepare their own food by photosynthesis. 4. This is possible only when you have the best CBSE Class 10 Science study material and a smart preparation plan. NADP is expanded as: (a) Nicotinamide, adenosine dinucleotide phosphate (b) Nicotinamide, adenine dinucleotide phosphate (c) Nicotinamide, adenine dinucleous phosphate (d) Nicotinamide, adenosine dinudeous phosphate, 7. Thylakoids. Chloroplasts are regarded as complete photosynthetic units of plants. (True). (False, Photosynthesis results in gain of dry weight of the plant.) Question 6: Respiration is said to be the reversal of photosynthesis. Question 3: Give some adaptations in a green leaf for photosynthesis. 11. (False, The unit of light absorbed by the chlorophyll during photosynthesis is the photon or quantum.) (i) What is the aim of the experiment ? 9. The main reaction which means the breaking up of water molecules through light. The light-independent reactions use energy from the supply of electrons to reduce carbon dioxide to produce glucose. Which process is the ultimate source of energy for all living organisms ? (iv). A light induced reaction which leads to splitting of water is Photolysis of water. (iii) If you are planning an experiment to show the effect of light on photosynthesis : (a) Will you select white light or green light ? (ii) How many veins have been shown. 6. 7. (ii) Identify the special condition inside the flask. (ii) Now the potted plant is kept in light. Grana 6. photosynthesis basics study for class 10th 1. MY ACCOUNT LOG IN; Join Now | Member Log In. What photosynthesis accomplishes, why it's important, and how the light-dependent and light-independent reactions work together. Oxygen is used in respiration whereas it is given out as a by-product in photosynthesis. Answer: 1. Extra Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations with Answers Solutions. Question 5: ATP is needed for dark reaction. Question 5: A leaf is a food factory. After the starch test, leaf Y would look like. In contrast, cellular respiration is a catabolic process resulting in the breaking down of organic molecules to release energy. Answer: This process produces food and releases oxygen, both of which are necessary to maintain life on earth. Form of energy which is converted into chemical energy during photosynthesis. (iii) Name the phenomenon which takes place in the above diagram. (b) Increase because more water is added. Question 8: Select the correct answer out of the available choices given under each question. The resulting glucose is converted to adenosine triphosphate (ATP) through cellular respiration, as explained on the Estrella Mountain Community College photosynthesis web page, to provide energy. The equation depicts the process by which plants and some bacteria produce glucose from carbon dioxide and water using energy from sunlight, as indicated in Jones and Jones' Advanced Biology Textbook (1997). (iv) Leaves are thin to allow rapid transport or diffusion of materials. (i) What aspect of photosynthesis was being investigated ? 14. NADP 10. Chloroplast 4. BASIC BUILDING CONCEPTS Photosynthesis (Greek word photos: light; synthesis-, putting together) is the process by which the green plants synthesise their own food (glucose) using carbon dioxide and water as raw materials in presence of sunlight and chlorophyll. Water may be used inside the plant but O2 released into the atmosphere. Answer the following: (i) What is the aim of this experiment? Question 17: Explain, why respiration is said to be a reversed process of photosynthesis ? 5.Photosystem Organization 6.Equation of photosynthesis 2. The potted plant was kept in the dark for 24 hours. 11. Light intensity, Water content, Temperature, Chlorophyll. (e) Cannot tell from the information given. (i) What aspect of photosynthesis was being tested ? (True) 12. (False, Oxygen is the life supporting gas produced due to photosynthesis.) (d) The first form of food substance produced during photosynthesis. Question 7: A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. Using the above information, answer the following questions : (i) State the aim of the above experiment. Explain this statement. Question 2: Photosynthesis is considered as a process supporting all life on earth. Name the process which is responsible for conversion of solar energy to chemical energy that is essential to sustain the life on this earth ? In photosynthesis radiant energy is converted into which from ? (ii) Name the membrane that connects thylakoid of one granum With the other granum. NADP (Nicotinamide Adenine dinucleotide phosphate): It is a coenzyme. Answer: During the day, the chloroplast in the guard cells are able to carry on photosynthesis, so the osmotic pressure in the cell sap of the guard cells is high and water enters the guard cells which lead to an opening of the stomatal aperture. Glucose, Water, Oxygen, Carbon-dioxide. Overview of photosynthesis. (ii) What is the function of sodium hydroxide solution in the flask? (ii) No CO2 in the flask. A high energy reduced compound formed in the light reaction and enter into the dark reaction. Answer: The rate of photosynthesis decreases and finally stops when the green plant gets green light because green light is not absorbed but reflected back by the plant. It is rinsed with hot water to remove alcohol and spread it on a white tile. The leaf which was exposed to the atmospheric air becomes blue black, and the one in the flask containing KOH does not become blue black after iodine test. One of the leaves was then plucked and an outline of the leaf marking the green and the non-green regions was drawn. (i) What is the object of the experiment ? (iv) The green parts of the leaf turned blue-black while non green parts turned brown. Photosynthetic Membrane 8. The immediate product of photosynthesis. Answer: Blackman (1905) established the law of limiting factor in connection with photo-synthesis. (ii) Take a potted plant and keep it for 2-3 days in dark to destarch its leaves. Question 24: A healthy croton plant bearing variegated leaves was kept in a dark cupboard to destarch it after which it was placed in sunlight for a few hours. 11. (Also known as the thylakoid membrane.) Answer: Photochemical phase of photosynthesis is light dependent. equation of photosynthesis class 10 How can it be destarched ? (ii) List the events taking place in the photo-chemical phase of Photosynthesis. (iv) What change is seen on the leaf after the starch test ? Chlorophyll 3. (iii) KOH or NaOH pellets. Photosynthesis is usually represented by the equation 6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2. Answer: (i) Chloroplast. It gets water from the stem. Class 10 Science Chemical Reactions and Equations – Get here the Notes for Class 10 Science Chemical Reactions and Equations. (iv) In what way will the three leaves (A, B and C) differ at the end of the experiment, when tested with iodine solution? Test the leaf for starch with iodine solution. Answer: Question 2: Draw a neat and well-labeled diagram of the apparatus you would set up to show that oxygen is given out during photosynthesis. Chloroplast 3. (a) Oxygen (b) Light (c) Carbon dioxide (d) Chlorophyll, 4. This energy is used during photolysis to split the water molecule into hydrogen and oxygen. Plastoquinone: A small molecule involved in electron and proton transfer in photosynthesis. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. Question 1: All life on earth Would come to an end if there were no green plants. A dark reaction is a Thermochemical reaction. A series of chemical reactions occur is quick succession initiated by light, therefore the phase is called photochemical phase. ... Give an overall balanced chemical equation to represent the process named in (i) above. Answer: (i) 1. Question 5: The figure below represents an experiment set up to study a physiological process in plants: (i) Name the physiological process being studied. This article is helpful for Class 10 Science . Question 7: State one important function of chloroplasts. NADPH 5. (ii) To remove all starch from the leaves of the plant. Boil the leaf in alcohol and wash in water. Free PDF download of Class 10 Biology Chapter 6 - Photosynthesis: Provider of Food for All Revision Notes & Short Key-notes prepared by our expert Biology teachers as per CISCE guidelines. Photosynthesis and cellular respiration are essentially the reverses of one another where photosynthesis is an anabolic process resulting in the formation of organic molecules. Answer: Green plants manufacture food during the process of photosynthesis and give out oxygen a life supporting gas for all organisms. The leaf was then tested for starch. Write the functional activity of the following structures: 1. (iii) Xylem – helps in the conduction of water. Phloem 11. (iii) During the starch test why was the leaf: (1) boiled in water (2) boiled in methylated spirit. Heterotrophs 7. During election transfer NADP get reduced and (rom NADP + H (NADPH2). Compensation point means the condition: (a) When the entire food manufactured in photosynthesis remains unutilised (b) When the pot is watered just to meet the full requirement of the plant (c) When rate of photosynthesis is equal to rate of respiration (d) Where there is neither photosynthesis nor respiration. Mushroom 10. After a few hours pluck the leaf and remove the black strips. (b) Why would you select a destarched plant ? What does ATP abbreviated for ? (c) Increases because the gas becotne less soluble. Carbon dioxide enters the leaf through Stomata. The formula for photosynthesis is 6CO2 + 6H2O + light energy = C6H12O6 + 6O2. Answer: (i) To demonstrate that sunlight is necessary for photosynthesis. (iv) Then the leaf is boiled in water for 2-3 minutes and then boiled in alcohol to remove the green chlorophyll. Answer: 1. Red 7. 2. The dark reaction of Photosynthesis is light independent. Question: 1. 12. The green colouring matter of the plants. All the starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of plant. If false rewrite the wrong statement in its correct form: 1. (ii) It is positioned at a right angle to the light to get maximum light. The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen. Question 1: Draw a neat and well-labeled diagram of the Chloroplast. Hemera Technologies/AbleStock.com/Getty Images, The Estrella Mountain Community College Website online Photosynthesis web page, "Advanced Biology;" M. Jones and G. Jones; 1997. Answer: 1. It is green flattened sac like structure. Question 25: A candidate in order to study the importance of certain factors in photosynthesis took a potted plant and kept it in the dark for over 24 hours. Answer: (i) The object of this experiment is to show that CO2 is necessary for photosynthesis. Cuticle 2. iii. (iii) (1) To kill the cells. Xylem 5. Free Energy: The amount of energy in a reactions available to do work. (iv) Give a well balanced equation to represent the process. (iv) Leaf 1, no change in colour with starch list. The empirical equation representing the total process of photosynthesis for oxygen evolving organisms was then understood as: CO H O CH O O Light 2 2+ → +[ ]2 2 where [CH 2 O] represented a carbohydrate (e.g., glucose, a six-carbon We Provide Step by Step Answer of Progress Check , MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type Questions and Structured / Applications / Skill Type Questions of Exercise-6 Photosynthesis ICSE Class-10 Concise .Visit official Website CISCE for detail information about ICSE Board Class-10. Identify metal 'X. Related articles. 7. Study the diagram and answer the questions that follow: (i) Why was the plant initially kept in darkness for 24 hours? Name the experiment to demonstrate the importance of light for photosynthesis. (iii) Briefly describe the reactions occurring in the leaves of the water weeds leading to the evolution of these bubbles. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide. (iii) There are numerous stomata to allow rapid exchange of gases. Question 4: What is the importance of photosynthesis in the life of the following : (i) Green plants (ii) Non-green plants (iii) Animals Answer: (i) Green plants are able to build up complex energy rich molecules of carbohydrates which are further used for different metabolic activities of cells. Column ‘II’ is a list of items related to ideas in Column ‘I’. 4. A cell that lacks chioroplast does not: (a) Evolve carbon dioxide (b) Liberate oxygen (c) Require water (d) Utilize carbohydrates, 5. In words, the equation may be stated as: Six carbon dioxide molecules and six water molecules react to produce one glucose molecule and six oxygen molecules. (Photo = Light, lysis = Breaking). In activity 6.1 class 10 ncert ,why they have removed or utilised starch and then created by photosynthesis again.Why did not they directly took leaf and did the experiment. Question 14: How is the rate of photosynthesis affected when a green plant gets green light ? Match the term in Column ‘II’ with the suitable idea given in Column ‘I’. Candidates who are ambitious to qualify the Class 10 with good score can check this article for Notes. Thus we can say that oxygen liberated during photosynthesis comes from water. (iv) Write a balanced chemical equation to represent the process of photosynthesis. The specific function of light energy in the process of photosynthesis is to: (a) Reduce.carbon dioxide (b) Synthesize glucose (c) Activate chlorophyll (d) Split water, 3. (ii) Stroma lamellae. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. CO2 is the life supporting gas produced due to photosynthesis. (iv) Give an overall balanced chemical equation to represent the process named in (i) above. Granum 2. (iii) To show that oxygen is given out during photosynthesis. Question 10: How do non-green plants such as fungi and bacteria obtain their nourishment ? ATP: Adenosine triphosphate, a small water soluble molecule that acts as an energy currency in cells. 10. (iii) State the functions of part 4 and 5. Question 16: Explain why transpiration and photosynthesis are interlinked during the day. (iii) Leaf is boiled in water to kill the cells and boiled in alcohol to remove chlorophyll. Answer: The splitting of water molecule into two component ions by light is known as photolysis of water. 2. Answer: The chlorophyll traps solar energy and converts it into chemical energy. Thus, light is necessary for photosynthesis. The site of light reaction in the cell of a leaf. A plant can be destarched by keeping it in the dark for two or three days, so that the leaves are free from stored starch. 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