4. 9. (iv) If ice cubes were added to the water, the rate of bubble formation would : (a) Remain the same. Then in the early hours of the morning she covered one of the leaves with black paper in the centre only. Light in which maximum rate of photosynthesis takes place. 8. Justify your answer. Overview of photosynthesis. Each year, photosynthesis synthesizes approx. 12. (ii) The special condition inside the flask is that there is no CO2 in the air as it has been absorbed by the KOH. (b) Increases because more photosynthesis occurs. Question 6: Respiration is said to be the reversal of photosynthesis. 5. Concise Biology Part II - Selina Solutions for Class 10 Biology ICSE, 6 Photosynthesis. The leaf anatomy is best suited for collecting the raw materials. Question 15: Why is it not possible to demonstrate respiration in a green plant kept in the sunlight ? (iii) Xylem – helps in the conduction of water. Photosynthesis in One Shot | ICSE/CBSE Class 10 Biology | How Does Photosynthesis Happen?. This shows that the region which did not receive light could not synthesise starch. (iii) After a few hours, the leaf is detached from the plant and the black strips are removed. These OH– react to liberate oxygen. (a) Loss of half of its branches (b) Loss of half of its flowers (c) Loss of all of its leaves (d) Loss of a little bark, 6. Boil the leaf in alcohol and wash in water. After the starch test, leaf X would look like. 7. Question 9: Why is photosynthesis important in nature ? photosynthesis basics study for class 10th 1. Light intensity, Water content, Temperature, Chlorophyll. (ii) List the events taking place in the photo-chemical phase of Photosynthesis. 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. Question: 1. 9. Phosphorylation: The covalent attachment of a phosphate group to a molecule. APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 5 Photosynthesis for ICSE Board Examinations. NADPH 5. (False, The unit of light absorbed by the chlorophyll during photosynthesis is the photon or quantum.) A light reaction is a Photochemical reaction. Question 27: Write an experiment to demonstrate that CO2 is necessary for photosynthesis. Question 4: The figure below represents an experiment performed to demonstrate a particular aspect of photosynthesis. Stroma 14. (v) If some sodium bicarbonate is added to the water the rate of bubble formation: (a) Increases because more respiration occurs. MY ACCOUNT LOG IN; Join Now | Member Log In. The leaf turns blue all over except the region covered with black strips. Question 8: Which tissues and cells are mainly concerned with photosynthesis ? Answer: (i) 1. Test the leaf for starch with iodine solution. Identify metal 'X. Answer: ATP provides energy for dark reaction. Cuticle 2. Question 5: ATP is needed for dark reaction. Hence, the ability to collect raw materials and to carry on chemical reactions to synthesize food, it is called as the food factory of the plant. 11. (iv) Leaf 1, no change in colour with starch list. (True) 9. Name the experiment to demonstrate the importance of light for photosynthesis. Photosynthesis is responsible for the presence of oxygen in our atmosphere. (True) 15. I. The unit of light absorbed by the chlorophyll during photosynthesis is the proton. 13. 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. KOH absorbs CO2. Photosynthetic Membrane 8. If a green plant is kept in bright light, it tends to use up all the CO2 produced during respiration, for photosynthesis. Photosynthesis process can be represented by a chemical equation. (ii) Now the potted plant is kept in light. (False, Oxygen is the life supporting gas produced due to photosynthesis.) Answer: (i) Chlorophyll is necessary for photosynthesis. Carbon cycle. If false rewrite the wrong statement in its correct form: 1. According to this law when a process is conditioned to its rapidity by a number of separate factors, the rate of process is limited by the pace of the lowest factor, i.e., the factor which is present in minimum amount. Photolysis 8. Answer: Answer has not given due to out of present syllabus. Class 10 Science Chemical Reactions and Equations – Get here the Notes for Class 10 Science Chemical Reactions and Equations. Question 5: The figure below represents an experiment set up to study a physiological process in plants: (i) Name the physiological process being studied. Question 18: Name the molecules which are called assimilatory power ? (True) 8. (ii) Iodine solution. (iii) Name the phenomenon which takes place in the above diagram. 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). 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. Take one leaf and cover it on both sides with two black paper strips, as shown in the diagram, with the help of cellophane tape. Question 8: Select the correct answer out of the available choices given under each question. Answer: (i) Chloroplast. (True) 18. Learn Photosynthesis Formula and Balanced Chemical Equation for Photosynthesis at Vedantu.com a) Light: Visible spectrum of the sunlight ranges from 380 to 750 nanometres in wavelength. Name the structure where photophosphorylation takes place. ATP: Adenosine triphosphate, a small water soluble molecule that acts as an energy currency in cells. (False, It remains stored in it for 24 to 48 hours) 17. 7. (ii) Is there any control in this experiment ? Answer: (i) The student is investigating the necessity of sunlight for photosynthesis. After a few hours pluck the leaf and remove the black strips. (ii) It is positioned at a right angle to the light to get maximum light. (iv). Now keep the potted plant in light. The chloroplasts are the actual sites of photosynthetic reactions-light and dark reactions which result in the formation of glucose. Leave it in the sunlight. Phloem 11. (iv) What change is seen on the leaf after the starch test ? 9. (iii) The process that takes place first in the photolysis of water is H+ and OH- … 4. C O X 2 + H X 2 O → C h l o r o p h y l l C X 6 H X 12 O X 6 + H X 2 O + O X 2 … (d) Decreases because water freezes. Free Energy: The amount of energy in a reactions available to do work. 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. Answer: The body of all living organisms both plants and animals is dependent on the food that has been synthesized in a green cell by photosynthesis. Organisms which cannot prepare their own food by photosynthesis. During election transfer NADP get reduced and (rom NADP + H (NADPH2). All these MCQs will help you acquaint with important concepts and … Oxygen is released during photosynthesis. The alphabet ‘A’ represents a certain condition inside the flask. Asked by avinashdesaiad10 21st May 2019 2:15 PM Photosynthesis 7. ... Photosynthesis is an endothermic reaction because energy, in the form of sunlight is absorbed during the process of photosynthesis by green plants. Plants contain chloroplast, which consists of green pigment chlorophyll, which traps the light energy and converts it into glucose , and releases oxygen and water. The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen. Question 21: On a bright sunny day water weeds growing in an aquarium were actively giving off bubbles of.gas. 10. The purification of the atmosphere whereby the volume of CO2 remains fairly constant due to the photosynthetic activity of green plants. 6CO2 + 6H2O — > C6H12O6 + 6O2. (ii) Oxygen. Radiant energy 4. Calvin Cycle 3. (False, Photosynthesis occurs in all green plants.) The numeral ‘1’ represents a certain condition inside the flask and the numeral ‘2’ represents a chemical responsible for this condition. (ii) Explain the process. Light Is Necessary For Photosynthesis Experiment Class 10 Introduction. (ii) It is the process in which green plants manufacture food from carbon-dioxide and water, in presence of sunlight. 6. The leaf is boiled with alcohol over a water bath till it becomes colourless. Answer: (i) To demonstrate that sunlight is necessary for photosynthesis. 4. Question 1: Light reaction and Dark reaction. (Carbon-di-oxide) 4. The chlorophyll on exposure to light energy becomes activated by absorbing photons. Answer: (i) A large surface area to absorb water. Photophosphorylation 11. Question 12: What is meant by photolysis of water ? Red 7. Land plants obtain their CO2 from atmosphere. (Chlorophyll), 1. Photosynthesis ICSE Class-10 Concise Selina Biology Solutions Chapter-6. Answer: See figure. Answer: Chloroplast contains chlorophyll which is used to trap the solar energy from the sunlight which falls on the leaf. (iv) Define the phenomenon. A simple way to explain photosynthesis for kids is by … (d) The first form of food substance produced during photosynthesis. 9. Formation of ATP in the chioroplast in the presence of light is called photophosphorylation. (iii) What do you conclude from this experiment? NCERT Class 10 Science Lab Manual – Light is Necessary for Photosynthesis. (i) From the graph it seems likely that the rate of bubbling per minute at 50 cm., would have been : (a) 2-0 (b) 2-5 (c) 3-0 (d) 3-5 (e) 4-0, (ii) The gas produced by the plant during the experiment was : (a) Air (b) Oxygen (c) Carbon dioxide (d) Nitrogen (e) Hydrogen, (iii) The gas collected comes due to the breakdown of: (a) Glucose (b) Starch (c) Water (d) Air (e) ATP. (False, Transpiration occurs along with photosynthesis.) Answer: (i) Photosynthesis. In addition to glucose, this reaction produces oxygen that is released by the plants into the atmosphere. Too much light destroys chlorophyll. Chloroplast 4. (True) 19. Question 4: Chloroplasts are called energy converters. Answer: Green plants manufacture food during the process of photosynthesis and give out oxygen a life supporting gas for all organisms. 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 ? The immediate product of photosynthesis. A high energy reduced compound formed in the light reaction and enter into the dark reaction. 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. It takes place in chlorophyll containing thylakoids of chloroplast. (ii) How many veins have been shown. The process of photosynthesis takes place in the dark. The chemical substance used to test the presence of starch in the cell of a leaf. (ii) It occurs in the grana of chloroplast. (True) 12. Answer: (i) In a dark room a leaf on the destarched plant is covered on either side with strips of black paper which is kept in place by paper clips or cellophane tape. (iii) Photosynthesis. (Photo = Light, lysis = Breaking). (iv) Give a well balanced equation to represent the process. The potted plant was then placed in sunlight for a few hours. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. (iii) Why is the leaf boiled in water and alcohol before testing for the presence of starch ? NADP (Nicotinamide Adenine dinucleotide phosphate): It is a coenzyme. 6. 3. Answer: A destarched plant has no starch present in the leaves and a leaf remains yellowish-brown when tested with iodine during a starch test. (b) I will select destarched plant so I can demonstrate the synthesis of starch through iodine test. Grana, Thylakoid, Stroma, Root. NADPH: Reduced form of nicotinamide ademne dinucleotide phosphate, a small water soluble molecule that acts as a hydrogen carrier in biochemical reactions. Explain. Stomata (ii) One vein has been shown. Oxygen is used in respiration whereas it is given out as a by-product in photosynthesis. The potted plant was kept in the dark for 24 hours. 7. Water 5. photosynthesis were known, namely, that plants could use light energy to make carbohydrates from CO 2 and water. 8. 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. Question 10: How do non-green plants such as fungi and bacteria obtain their nourishment ? The main reaction which means the breaking up of water molecules through light. (iii) Animals eat green plants or eat animals that feed on green plants. 2. Photosynthetic Membrane: A bilayer of lipid molecules in which are embedded proteins that transform light’energy into chemical free energy. Which would do maximum harm to a tree? Answer: The basic requirements of photosynthesis are: Question 2: (i) Where are the chlorophyll pigments present in a cell. Answer: 1. 4OH ——> 2H2O + O2, Mention, if the following statements are True or False. (ii) Of what gas do these bubbles consist ? (iii) If you are planning an experiment to show the effect of light on photosynthesis : (a) Will you select white light or green light ? Question 11: “Oxygen is a waste product of photosynthesis.” Comment. This energy is used in splitting the water molecules (photolysis) as below :-. So, photosynthesis occurs in the presence of Carbon dioxide, Water, Sunlight and Chlorophyll(catalyst- which helps in the reaction to occur but itself do not includes in it). Oxygen is given out by green plants. (d) H+ combines with CO2 in dark reaction to produce glucose. Answer: Photochemical phase of photosynthesis is light dependent. It is green flattened sac like structure. Glucose, Water, Oxygen, Carbon-dioxide. (c) Increases because the gas becotne less soluble. This article is helpful for Class 10 Science . Chlorophyll 3. Glucose 9. 10. Candidates who are ambitious to qualify the Class 10 with good score can check this article for Notes. 4. Answer: The tissues and cells which contain chloroplasts are mainly the palisade parenchyma and spongy mesophyll cells of a green leaf. Question 3: Give some adaptations in a green leaf for photosynthesis. - [Instructor] Photosynthesis is pretty awesome. The part of the chloroplast where the dark reaction of photosynthesis takes place. (iii) Select the correct leaf from the five available choices shown in the diagram as A, B, C, D and E. Rewrite the correct answer for the filling in the appropriate letter from the questions that follow: 1. (Also known as the thylakoid membrane.) Using the above information, answer the following questions : (i) State the aim of the above experiment. Download Formulae Handbook For ICSE Class 9 and 10. The conversion of physical energy of light into chemical energy by the chloroplast is called Photophosphorylation. Justify your answer. Photosynthesis is usually represented by the equation 6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2. (iv) In what manner do the leaves 1 and 2 differ at the end of the starch test ? Answer: The chlorophyll traps solar energy and converts it into chemical energy. (iv) The leaf is tested for presence of starch as follows: Question 26: A potted plant was taken in order to prove a factor necessary for photosynthesis. In contrast, cellular respiration is a catabolic process resulting in the breaking down of organic molecules to release energy. Fill in the blanks: Question 1. Photosynthesis can also occur n artifidal light such as that of a 100 watt electric lamp. To register Biology Tuitions on Vedantu.com to clear your doubts. 6. (iv) Then the leaf is boiled in water for 2-3 minutes and then boiled in alcohol to remove the green chlorophyll. Chloroplast 3. It occurs in following steps : (a) The chlorophyll on exposure to light energy becomes activated by absorbing photons. (c) Decreases because the temperature drops. Plastoquinone: A small molecule involved in electron and proton transfer in photosynthesis. Question 17: Explain, why respiration is said to be a reversed process of photosynthesis ? (iv) Photosynthesis is the process by which living plant cells, containing chlorophyll, produce food substances (glucose and starch), from carbon dioxide and water, by using light energy. Photosynthesis is a process by which plants prepare food. One of the leaves was then plucked and an outline of the leaf marking the green and the non-green regions was drawn. Answer the following: (i) What is the aim of this experiment? Answer: When a plant is kept in sunlight, CO2 released by respiration gets used by photosynthesis to synthesize food. After the starch test, leaf Y would look like. 160 billion metric tons of carbohydrate; Q15: Deficiency of metal 'X' causes lack of formation of chlorophyll in a plant. Answer: Question 2: Stroma of chloroplast and Grana of chloroplast. Based in Manchester, England, John Newton has been writing since 2006. Upper Epidermis 3. (iii) The plant is kept in the dark before the experiment to destarch the leaves. ... Give an overall balanced chemical equation to represent the process named in (i) above. Question 13: Oxygen given out during photosynthesis comes from water. Related articles. Factors affecting photosynthesis Rate of photosynthesis depends on many factors like light, carbon dioxide, water and chlorophyll. Answer: Green leaves are thin and broad so that they can receive more light and can photosynthesize more efficiently. Question 6: Why green leaves are thin and broad ? (iii) There are numerous stomata to allow rapid exchange of gases. Answer: Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment, which comes from dead animals and plants. Answer: 1. Insert one of its leaves in a conical flask, which contains potassium hydroxide. (ii) To remove all starch from the leaves of the plant. (v) The leaf is then washed in water and tested with iodine. (iv) Give an overall balanced chemical equation to represent the process named in (i) above. It gets water from the stem. 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. (iii) What is the aim of the experiment? 12. Photosynthesis, derived from the Greek words photo, meaning "light," and synthesis "putting together," is a process used by plants and some bacteria to harness the energy from sunlight to convert water and carbon dioxide to produce sugar (glucose) and oxygen. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide. iii. CO2 is the life supporting gas produced due to photosynthesis. The light-independent reactions use energy from the supply of electrons to reduce carbon dioxide to produce glucose. The reaction requires energy in the form of light to overcome the activation energy needed for the reaction to proceed. It was then set up as shown in the diagram and exposed to light for about 12 hours. (v) What is the importance of the above phenomenon ? (ii) What is the special condition inside the flask ? Carbon dioxide enters the leaf through Stomata. (False, It takes place in the presence of sunlight.) Plastoquinone 6. 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