The raw materials for photosynthesis include water and CO2. The potted plant was kept in the dark for 24 hours. 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. Question 19: What is the law of limiting factor ? (False, It remains stored in it for 24 to 48 hours) 17. The various processes resulting in the circulation of carbon in different forms constitute the carbon cycle. Insert one of its leaves in a conical flask, which contains potassium hydroxide. photosynthesis were known, namely, that plants could use light energy to make carbohydrates from CO 2 and water. Boil the leaf in alcohol and wash in water. (ii) Now the potted plant is kept in light. A series of chemical reactions occur is quick succession initiated by light, therefore the phase is called photochemical phase. Radiant energy 4. (iii) The process that takes place first in the photolysis of water is H+ and OH- ions with the help of energy from sunlight. One of the leaves was then plucked and an outline of the leaf marking the green and the non-green regions was drawn. A cell that lacks chioroplast does not: (a) Evolve carbon dioxide (b) Liberate oxygen (c) Require water (d) Utilize carbohydrates, 5. The potted plant was then placed in sunlight for a few hours. ICSE Solutions for Class 10 Biology – Photosynthesis. Name the process which is responsible for conversion of solar energy to chemical energy that is essential to sustain the life on this earth ? Heterotrophs 7. Photosynthesis is a process by which plants prepare food. Question 11: “Oxygen is a waste product of photosynthesis.” Comment. The formula for photosynthesis is 6CO2 + 6H2O + light energy = C6H12O6 + 6O2. (True) 3. The portion covered with black paper remains colourless while rest of the leaf turn blue black. Download Formulae Handbook For ICSE Class 9 and 10. (ii) What is the special condition inside the flask ? Answer: Take a destarched plant. (i) What is the aim of the experiment ? 5. (iii) Photosynthesis. 0.03-0.04% 6. Photosynthesis can also occur n artifidal light such as that of a 100 watt electric lamp. 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. (b) Increases because more photosynthesis occurs. Plastoquinone: A small molecule involved in electron and proton transfer in photosynthesis. (iii) Leaf is boiled in water to kill the cells and boiled in alcohol to remove chlorophyll. (True) 16. Answer: 1. They are called so, because they provide the energy requirement for CO2 assimilation during dark reaction of photosynthesis. Question 28: List the events taking place in the photo-chemical phase of Photosynthesis. 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. The process of photosynthesis takes place in the dark. (False, It takes place in the presence of sunlight.) Study the diagram and answer the questions that follow: (i) Why was the plant initially kept in darkness for 24 hours? Photosynthesis occurs only in plants. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide. If so, state the same. Which one of the following would not be a limiting factor for photosynthesis ? Given below is the overall chemical equation of photosynthesis which is incomplete in certain respects. Chlorophyll, Chlorophyll b, n-carotene, Photon. 9. The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen. iii. 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 ? Photophosphorylation 11. 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 4: Chloroplasts are called energy converters. Leaves are broad and flat to increase the surface area for photosynthesis. Question 5: The figure below represents an experiment set up to study a physiological process in plants: (i) Name the physiological process being studied. 2. All these MCQs will help you acquaint with important concepts and … Oxygen is released during 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. The conversion of physical energy of light into chemical energy by the chloroplast is called Photophosphorylation. (Photo = Light, lysis = Breaking). Photosynthetic Membrane: A bilayer of lipid molecules in which are embedded proteins that transform light’energy into chemical free energy. Radiant energy is converted into chemical energy by photosynthesis. H2 ———> H+ + OH–. Using the above information, answer the following questions : (i) State the aim of the above experiment. Which would do maximum harm to a tree? Question 12: What is meant by photolysis of water ? Now keep the potted plant in light. Water 5. (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. Then in the early hours of the morning she covered one of the leaves with black paper in the centre only. Answer: The chlorophyll traps solar energy and converts it into chemical energy. Question 21: On a bright sunny day water weeds growing in an aquarium were actively giving off bubbles of.gas. Each year, photosynthesis synthesizes approx. 6. ATP: Adenosine triphosphate, a small water soluble molecule that acts as an energy currency in cells. 14. 2. (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. Too much light destroys chlorophyll. 4OH ——> 2H2O + O2, Mention, if the following statements are True or False. 5. Question 10: How do non-green plants such as fungi and bacteria obtain their nourishment ? 7. 13. The leaf turns blue all over except the region covered with black strips. (iii) Name an alternative chemical that can be used instead of KOH. Name only one plant, you are familiar with which has no chlorophyll. (iv) The green parts of the leaf turned blue-black while non green parts turned brown. 8. Question 7: A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. (ii) Oxygen. Upper Epidermis 3. (ii) To remove all starch from the leaves of the plant. (True) 9. 2. Question 22: What is meant by destarched plant ? Keywords: Photosynthesis, Photosynthesis Equation, Raw materials for Photosynthesis, Site of photosynthesis, Autotrophic nutrition. Grana, Thylakoid, Stroma, Root. Cuticle 2. ATP 2. 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Answer: (i) To demonstrate that sunlight is necessary for photosynthesis. Question: 1. (iv) Write a balanced chemical equation to represent the process of photosynthesis. This shows that the region which did not receive light could not synthesise starch. Free Energy 4. Answer: Green plants manufacture food during the process of photosynthesis and give out oxygen a life supporting gas for all organisms. 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. Nicotinamide Adenine Dinucleotide Phosphate 13. Red 7. 11. (iii) The plant is kept in the dark before the experiment to destarch the leaves. Source of oxygen given out in photosynthesis. Question 8: Select the correct answer out of the available choices given under each question. Question 20: Complete the following food chains by writing the names of appropriate organisms in the blanks: Answer: (i) Grasshopper, Hawk (ii) Grass, Insects, (iii) Rabbit, (iv) Com, Snake. CBSE Class 10 Science Practical Skills – Light is Necessary for Photosynthesis. Photosynthesis 7. PhotoLysis is the reaction which means the breaking up of water molecules. (True) 8. Calvin cycle was proposed by Melvin Calvin. (c) Decreases because the temperature drops. The overall balanced equation is 6CO2 + 6H2O -----> C6H12O6 + 6O2. 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. Answer: (i) That light is necessary for photosynthesis. Pour iodine solution on it. The hydroxyl ions combine to form hydrogen peroxide 2OH —> H2O2 which decompose to give molecular oxygen, i.e., 2H2O2 ——> 2H2O + O2 (iv). 14. In most plants, water is supplied from the roots, with the leaves collecting carbon dioxide via the stomata and sunlight captured by the chloroplasts in the leaves. (iv) Leaf A will be yellowish-white. It's where the plants and the trees and all the green stuff that you find around yourself take in water and carbon dioxide from their surrounding, and then use the energy of the sun to manufacture their own carbohydrate molecules. Stomata (ii) One vein has been shown. A plant that does not perform photosynthesis is Fungus. Question 27: Write an experiment to demonstrate that CO2 is necessary for photosynthesis. Write the functional activity of the following structures: 1. Question 17: Explain, why respiration is said to be a reversed process of photosynthesis ? 8. Leave it in the sunlight. Thus, light is necessary for photosynthesis. 3. AIIP stands for Adenosine diphosphate. 3. (Carbon-di-oxide) 4. (False, Photosynthesis occurs in all green plants.) 13. Answer: The tissues and cells which contain chloroplasts are mainly the palisade parenchyma and spongy mesophyll cells of a green leaf. (True) 10. (ii) Iodine solution. (iv) Describe step by step how the candidate proceeded to test the leaf for the presence of starch. (e) Cannot tell from the information given. Answer: (i) Photosynthesis. Test the leaf for starch with iodine solution. Adenosine Triphosphate 12. (ii) Stroma lamellae. Justify your answer. Photosynthesis is responsible for the presence of oxygen in our atmosphere. Photosynthesis occurs in all the cells of a plant. Explain this statement. 3. Formation of ATP in the chioroplast in the presence of light is called photophosphorylation. (iii) What is the aim of the experiment? NADP 10. (ii) Describe an experiment to show that light is necessary for photosynthesis. (ii) Is there any control in this experiment ? A series of chemical reactions occur in quick succession initiated by light, therefore the phase is called photochemical phase. (iii) If you are planning an experiment to show the effect of light on photosynthesis : (a) Will you select white light or green light ? Oxygen is used in respiration whereas it is given out as a by-product in photosynthesis. Answer: (i) Photosynthesis. Thus we can say that oxygen liberated during photosynthesis comes from water. Answer: (i) 1. ... Give an overall balanced chemical equation to represent the process named in (i) above. Overview of photosynthesis. (v) If some sodium bicarbonate is added to the water the rate of bubble formation: (a) Increases because more respiration occurs. Question 1: Draw a neat and well-labeled diagram of the Chloroplast. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’. 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. The light-dependent reaction uses energy captured from sunlight by the chloropasts in plant leaves to produce a supply of electrons for the light-independent reactions. (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. (Chlorophyll), 1. 2. (v) Photosynthesis is the source of energy food and oxygen. NCERT Class 10 Science Lab Manual – Light is Necessary for Photosynthesis. Photosynthesis is usually represented by the equation 6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2. Class 10 Science Chapter 1 Extra Questions and Answers Chemical Reactions and Equations. 7. I. (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. Which process is the ultimate source of energy for all living organisms ? Leaf 2, will turn blue black at the end of starch test. In photosynthesis radiant energy is converted into which from ? Question 13: Oxygen given out during photosynthesis comes from water. (iii) There are numerous stomata to allow rapid exchange of gases. Answer: The splitting of water molecule into two component ions by light is known as photolysis of water. (iii) Why was the plant kept in the dark before the experiment ? If a green plant is kept in bright light, it tends to use up all the CO2 produced during respiration, for photosynthesis. What photosynthesis accomplishes, why it's important, and how the light-dependent and light-independent reactions work together. After a few hours pluck the leaf and remove the black strips. Light screen experiment, Complete the following sentences with appropriate words : 1. Photosynthesis in One Shot | ICSE/CBSE Class 10 Biology | How Does Photosynthesis Happen?. During this reaction, carbon dioxide and water are converted into glucose by chlorophyll in the presence of light energy. (ii) It is positioned at a right angle to the light to get maximum light. All the solutions of Photosynthesis - Biology explained in detail by experts to help students prepare for their ICSE exams. Photosynthesis process can be represented by a chemical equation. Answer: Question 1: The figure below represents the vertical section of a leaf: (i) Name the parts 1 to 5. To register Biology Tuitions on Vedantu.com to clear your doubts. (False, Transpiration occurs along with photosynthesis.) Land plants obtain their CO2 from atmosphere. Thus stomatal transpiration can take and CO2 can also enter the green leaf to enable photosynthesis to take place. Factors affecting photosynthesis Rate of photosynthesis depends on many factors like light, carbon dioxide, water and chlorophyll. Answer: Photochemical phase of photosynthesis is light dependent. (2) Why would you select a destarched plant ? A high energy reduced compound formed in the light reaction and enter into the dark reaction. 2. Photosynthesis is comprised of two stages, the light-dependent reaction and the light-independent reactions, as explained in Jones and Jones. (iii) The process that takes place first in the photolysis of water is H+ and OH- … Question 15: Why is it not possible to demonstrate respiration in a green plant kept in the sunlight ? Answer: (i) (ii) Photo chemical phase of photosynthesis is light dependent. Photosynthesis: The physical-chemical process by which certain chlorophyll (containing organisms use light energy for the biosynthesis of organic molecules. (ii) Label the guidelines 1-3. 5. She placed the potted plant in the sunlight for a few hours, and then tested the leaf which was covered with black paper for starch. It gets water from the stem. (ii) Oxygen. (iii) CaO (limestone), potassium pyrogollate. A simple way to explain photosynthesis for kids is by … (iii) (a) 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 3: Give some adaptations in a green leaf for photosynthesis. Answer: Question 2: Stroma of chloroplast and Grana of chloroplast. (iii) During the starch test why was the leaf: (1) boiled in water (2) boiled in methylated spirit. 10. The principal site in a green leaf for photosynthesis. 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. (v) The leaf is then washed in water and tested with iodine. A light reaction is a Photochemical reaction. Generally, photosynthesis utilizes light vitality to change over carbon dioxide into a starch. (iii) Light is necessary for photosynthesis. 5. 13. 10. The immediate product of photosynthesis. Question 2: (i) Identify the above diagram. Concise Biology Part II - Selina Solutions for Class 10 Biology ICSE, 6 Photosynthesis. The reaction requires energy in the form of light to overcome the activation energy needed for the reaction to proceed. 10. The leaf is boiled with alcohol over a water bath till it becomes colourless. Hemera Technologies/AbleStock.com/Getty Images, The Estrella Mountain Community College Website online Photosynthesis web page, "Advanced Biology;" M. Jones and G. Jones; 1997. (i) What aspect of photosynthesis was being tested ? Light intensity, Water content, Temperature, Chlorophyll. (d) H+ combines with CO2 in dark reaction to produce glucose. Related articles. 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. (iii) Xylem – helps in the conduction of water. (ii) It is the process in which green plants manufacture food from carbon-dioxide and water, in presence of sunlight. Plants release oxygen as a waste product during photosynthesis. 6. Light in which maximum rate of photosynthesis takes place. Xanthophyll is Yellow coloured pigment. Name the tissue that transports manufactured starch from the leaves to all parts of the plant. (iii) KOH or NaOH pellets. (c) Increases because the gas becotne less soluble. (iii) State the functions of part 4 and 5. Question 5: A leaf is a food factory. (2) To destroy the chlorophyll. Answer: (i) 3-5, (ii) Oxygen, (iii) Water, (iv) Decreases because the temperature drops, (v) Increases because photosynthesis increases. CO2 is the life supporting gas produced due to photosynthesis. What does NADP stand for ? Thylakoids. Light Is Necessary For Photosynthesis Experiment Class 10 Introduction. Answer: ATP and NADPH2 are called assimilatory power. Answer: (i) To prove that CO2 is necessary for photosynthesis. Learn Photosynthesis Formula and Balanced Chemical Equation for Photosynthesis at Vedantu.com (True) 7. Question 9: Why is photosynthesis important in nature ? Photosynthesis: It is the process by which green plants manufacture food by using carbon dioxide and water in the presence of sunlight. Plants contain chloroplast, which consists of green pigment chlorophyll, which traps the light energy and converts it into glucose , and releases oxygen and water. (v) What is the importance of the above phenomenon ? Answer: Answer has not given due to out of present syllabus. 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. Photosynthetic Membrane 8. Question 18: Name the molecules which are called assimilatory power ? A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to: (a) Remove starch from the plant (b) Ensure that starch is not translocated from the leaves (c) Remove chlorophyll from the leaf of the plant (d) Remove starch from the experimental leaf, 8. (iv) What change is seen on the leaf after the starch test ? Copyright 2021 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. The leaf absorbs CO2 from the atmosphere through its stomatal openings. The main difference between chlorophyll ‘a’ and ‘b’ is: (a) Chlorophyll ‘a’ is a linear chain compound and ‘b’ is branched chain (b) Chlorophyll ‘a’ has no Mg ion in centre of molecule (c) In chlorophyll ‘a’ there is — CH3 group whereas in ‘b’ it is — CHO group (d) All of the above. The main reaction which means the breaking up of water molecules through light. Calvin Cycle 3. 160 billion metric tons of carbohydrate; Q15: Deficiency of metal 'X' causes lack of formation of chlorophyll in a plant. Justify your answer. (ii) Non-green plants such as saprophytes and parasites use the food prepared by green plants during photosynthesis as a source of their own nutrition. Fill in the blanks: Question 1. Question 5: ATP is needed for dark reaction. 6CO2 + 6H2O — > C6H12O6 + 6O2. 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. NADPH 5. Plastoquinone 6. 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. The chemical substance used to test the presence of starch in the cell of a leaf. After a few hours, test this and any other leaf of this plant for starch. These ICSE Class 10 Biology Chapter 6 Photosynthesis Revision Notes will definitely help students to save a lot of time during their examinations. Xylem 5. Form of energy which is converted into chemical energy during photosynthesis. KOH absorbs CO2. 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 … Based in Manchester, England, John Newton has been writing since 2006. The alphabet ‘A’ represents a certain condition inside the flask. Thus they are dependent on photosynthesis. (ii) 1. photosynthesis basics study for class 10th 1. Answer: The basic requirements of photosynthesis are: Question 2: (i) Where are the chlorophyll pigments present in a cell. Question 9: (i) Draw a neat and well-labelled diagram of the Chloroplast. 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. 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). 4. Phosphorylation 9. 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. Photosynthesis results in loss of dry weight of the plant. Answer: (i) Chlorophyll is necessary for photosynthesis. Column ‘II’ is a list of items related to ideas in Column ‘I’. (iii) After a few hours, the leaf is detached from the plant and the black strips are removed. Carbon dioxide enters the leaf through Stomata. What does ATP abbreviated for ? A dark reaction is a Thermochemical reaction. (Photon) 3. 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. (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. Stroma 14. (iv) Then the leaf is boiled in water for 2-3 minutes and then boiled in alcohol to remove the green chlorophyll. 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 During election transfer NADP get reduced and (rom NADP + H (NADPH2). The green colouring matter of the plants. Question 1: What are the basic requirements of photosynthesis ? Question 3: Chlorophyll is necessary for photosynthesis. Answer: ATP provides energy for dark reaction. Answer: (i) The object of this experiment is to show that CO2 is necessary for photosynthesis. After the starch test, leaf Y would look like. (iv) In what way will the three leaves (A, B and C) differ at the end of the experiment, when tested with iodine solution? 9. No transpiration occurs during photosynthesis. 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. Asked by avinashdesaiad10 21st May 2019 2:15 PM 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. Answer: (i) In the cell organelle called plastids (or chloroplasts). Answer: The chlorophyll traps solar energy and converts it into chemical energy. In a short essay $(100-150$ words), describe how the process of photosynthesis in the chloroplasts of plants transforms the energy of sunlight into the chemical energy of sugar molecules. Answer: (i) Photosynthesis. 10. (False, Photosynthesis results in gain of dry weight of the plant.) (ii) How many veins have been shown. 7. (Root) 2. NADPH2 8. MY ACCOUNT LOG IN; Join Now | Member Log In. (d) Decreases because water freezes. In words, the equation translates to the combining of water, carbon dioxide and light energy to produce glucose and oxygen. Iodine, Question: 1. 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. (False, Oxygen is the life supporting gas produced due to photosynthesis.) If false rewrite the wrong statement in its correct form: 1. In addition to glucose, this reaction produces oxygen that is released by the plants into the atmosphere. It takes place in chlorophyll containing thylakoids of chloroplast. 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. equation of photosynthesis class 10 Answer: Blackman (1905) established the law of limiting factor in connection with photo-synthesis. And. (d) The first form of food substance produced during photosynthesis. Question 23: Using the destarched plant describe step by step how would you proceed to prove that in the absence of light the leaf cannot manufacture starch ? The experiment showing that CO2 is necessary for photosynthesis. Answer: Magnesium (Mg) ☛ Watch Khanacademy Photosynthesis video on Photosynthesis: Occur is quick succession initiated by light, therefore the phase is called photochemical phase the... Tends equation of photosynthesis class 10 use up all the CO2 produced during respiration, for photosynthesis )... 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