A plant used for experiments on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. For destarching, the potted plant can kept in a dark room for 24-48 hours. (a) The category of organisms that prepare their own food from basic raw materials. (a) Guard cells are cells surrounding each stoma. Photosynthesis provides food not only to the plant itself but to all animal life including humans as well, and also the life-supporting free oxygen gas in the atmosphere for breathing. Why is it not possible to demonstrate respiration in a green plant kept in sunlight? Correct Statement: Dark reaction of photosynthesis is independent of light and occurs simultaneously with light reaction. Oxygen is the element which all the organisms 2-4 and even 5 are getting from No. Photosynthesis occurs in plants and some bacteria. Given below is a schematic diagram to illustrate some aspects of photosynthesis. Photosynthesis is ultimately the source of energy and food for all living being directly for plants and indirectly for animals and humans who eat the plants or the plant-eating animals. Section I (40 Marks) Attempt all questions from this Section. It is contained in microscopic cell organelles called chloroplasts. ICSE Class 10 Biology Important Questions 1. If the rate of respiration becomes more than the rate of photosynthesis, plants will: (a) continue to live, but will not be able to store food, (c) grow more vigorously because more energy will be available, (d) stop growing and die gradually of starvation. (c) Name the biological process which was the starting point of the whole chain. (b) Name any one organism that could be shown at No.5. Dark reaction involves the transfer of hydrogen from NADPH through a series of chemical reaction, to combine with CO. All green plants prepare their own food. Arrow A indicates Transpiration and arrow B indicates the ascent of sap. Raksha planted many plants in her home garden as she knew that the plants help to purify air. (d) Why does test-tube B have more bubbles of oxygen? Green plants are called natural purifiers of the air. Hence most leaves have the upper surface more green and shiny than the lower one. Extra Questions for Class 10 Science Chapter 6 Value Based Questions. 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. (d) Xylem tissue in the leaf veins In every period of twenty-four hours, plants are subjected to a regular cycle change in light intensity, and the rate of photosynthesis increases from dawn to midday and declines as dusk approaches. Solution:-, (f) Photosynthesis results in loss of dry weight of the plants. (d) Write a balanced chemical equation to represent the process of photosynthesis. Photosynthesis is the physiological process that releases the bubbles of oxygen. (3) Respiration consists of two stages, they are inhalation and exhalation. The potted plant was kept in the dark for 24 hours. 9. Glucose is the first form of food substance produced during photosynthesis. (a) Guard cells (2) Respiration is not dependent on light. Extramarks, an e-learning website offers online tutorials for ICSE class 10 Photosynthesis & its Significance Chapter. Given below are five terms. We know that temperature is an important factor for the rate of photosynthesis. One of the leaves was covered with black paper in the centre. (a)The hydrogen ions (H+) are picked up by a compound NADP (Nicotinamide adenine dinucleotide phosphate) to form NADPH. Solution:-, To study the effect of sunlight on the rate of photosynthesis. Fixation and reduction of carbon dioxide occurs in the stroma of the chloroplast through a series of reactions. (f) Photosynthesis results in loss of dry weight of the plants. (d) The first form of food substance produced during photosynthesis. (f) If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will fail to occur. (e) The organisms that can be called “natural purifiers” of the air. Producers show autotrophic mode of nutrition i.e. It is a highly complex substance, composed of carbon, hydrogen, oxygen, nitrogen and magnesium chloroplasts are mainly contained in the mesophyll cells located between the upper epidermis and the lower epidermis of leaves. To obtaining expected result replace the lime water from potassium hydroxide because it absorbs carbon dioxide. Yes. A candidate studied the importance of certain factors in photosynthesis. (C) The electrons (e–) are used in converting ADP (adenosine diphosphate) into energy-rich compound ATP (adenosine triphosphate) by adding one phosphate group Pi (inorganic phosphate), (ii) The reaction is the phase do not require light energy and occur simultaneously with the light reaction (time gap between the two being less than even one-thousandth of a second). Fungi and bacteria break down the organic matter to obtain the nourishment and they release carbon dioxide back in the atmosphere. If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will continue to occur because the dark reaction is independent of light and it occurs simultaneously with the light dependent reaction. (c) Carbon dioxide released by the snail during respiration is used by the plant for photosynthesis. Students who wish to score good marks in Biology practise Selina Solutions Concise Biology Class 10. ... ICSE 10 Biology Revision Notes. 2)Dark reaction - It is independent of light and occurs in stroma region of plastids. With four organisms 1-4. The pigment chlorophyll is contained in the walls of thylakoids. What aspect of photosynthesis was being investigated? (a) Respiration and photosynthesis (gas released) (a) Light is required for photosynthesis. All other organisms, directly or indirectly depend on this food for their survival. Solution:-. (b) No, the experiment will not work satisfactorily, as the beaker contains lime water and not potassium hydroxide to absorb CO2. 5. All the other three terms are concerned with processes in plants. (d) Would you take any step before starting the experiment? Some of this oxygen may be used in respiration in the leaf cells, but the major portion of it is not required and it diffuses out into the atmosphere through the stomata. To get purified air in her room she kept some of the plants in a closed room, it leaves turned pale in colour after some days. At night it is converted back into soluble sugar and translocated to different part of the body either for the utilization or for the storage. So, oxygen is not a waste of photosynthesis because all organisms require it for their existence including the plants. (c) The compound which stores energy in the cells. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. (e) Give an example of a water plant that can be used in the above experiment. (e) The phloem transports the photosynthetic products from the leaf to the other parts of the plant. 8. Photosynthesis results in gain of dry weight of the plants. Chloroplasts are mainly contained in the mesophyll cells. Is there any control in this experiment? The glucose is converted into insoluble starch and later into soluble sugar i.e. The glucose produced is either immediately used up by the cells or stored in the form of starch. State any four differences between photosynthesis and respiration. Fill in the blanks with the appropriate answer from the choices given in the brackets. He took a potted plant and kept in the dark for over 24 hours. During day time, when sunlight falls on the leaf, the light energy is trapped by the chlorophyll of the upper layers of mesophyll, especially the palisade cells. This increases the rate of photosynthesis in the plant placed in test tube B which leads to the release of more amount of oxygen. Respiration results in loss of dry weight of the plants. 1. The splinter glows due the presence of oxygen in the test tube which proves that the gas collected in the test is released by hydrilla during photosynthesis. The grass is eaten up by the grasshopper. A glowing splinter bursts into a flame which shows the presence of oxygen. solution in added. (c) Stroma is the ground substance in …………… (cytoplasm, chloroplast, ribosomes). (f) Write the overall chemical equation for the above process. The leaf is placed in warm water to soften it. This page consists of solutions of all questions asked in ICSE Biology Photosynthesis. The leaves will not show the presence of starch. How would you demonstrate that green plants release oxygen when exposed to light? If so, state it. Chloroplasts are cell organelles, situated in the cytoplasm of plant cells. (f) If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will fail to occur. (a) To demonstrate the importance of carbon dioxide in photosynthesis. (c) Starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of the plant. A perfect student guide for Biology that incorporates Notes, MCQ, FIll in the blanks, short Q&As, and other relevant objective type questions for all chapters in the Biology textbook as per the latest Class 10 ICSE Board Exam syllabus with solutions.. 12. The leaves will not show the presence of starch. (c) The compound which stores energy in the cells. Solution:-, (e) Green plants are consumers. During photosynthesis, the oxygen in glucose comes from, (a) The category of organisms that prepare their own food from basic raw materials. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch. He took a potted plant and kept in the dark for over 24 hours. (4) The carbon dioxide is used and released in the process of photosynthesis. The production of starch, and not glucose, is often used as a measure of photosynthesis in leaves because (a) starch is immediate product of photosynthesis (b) glucose formed in photosynthesis soon gets converted into starch (c) starch is soluble in water Ice cold water will hamper the process of photosynthesis in the immersed leaf, even if there is sufficient sunshine because the temperature is an important factor for the rate of photosynthesis. Answer : Odd term : Phagocytosis. During this stage, light energy is converted into chemical energy. (2) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. Oxygen is released as a by-product. Question 15 : Complete the following statement by filling in the blanks with the appropriate word from the choices given in … The leaves will not show the presence of starch. A potted plant was taken in order to prove a factor necessary for photosynthesis. One would easily think that the rate of photosynthesis will increase with light intensity. Invert a test tube full of water over the stem of the funnel. ICSE Solutions for Class 10 Biology – Photosynthesis ICSE SolutionsSelina ICSE Solutions APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 5 Photosynthesis for ICSE … (f) Stomata are minute opening occurring in large numbers on the lower surface of a leaf. 4. It is then placed in a dish and iodine solution in added. Answer : Balsam is a herbaceous plant that loses too much of water by excessive transpiration, i.e., the rate of transpiration is more than the rate of absorption. they depend directly or indirectly on the producers for their food. These notes are totally based on latest Biology textbook of ICSE Board. (2) The leaf was boiled in methylated spirit to dissolve chlorophyll. Select your board, class and subject to Get Started: Select board . to remove the pre-existing starch from the storage organs. (g) Photosynthesis stops at a temperature of about 35oC. (a) The rate of photosynthesis continues to rise as long as the intensity of light rises. The time gap between the light and dark reaction is less than one thousandth of a second. 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-9 Excretory System ICSE Class-10 .Visit official Website CISCE for detail information about ICSE Board Class-10. Give reason. To test the leaf for starch, the leaf is boiled in water to kill the cells. During this period, all the starch will be removed from the leaves and stored in the storage organs. Your email address will not be published. Which one chemical reaction occurs during photosynthesis? Water is taken up by the roots from the soil, sent up through the stem and finally brought to the leaves (site of photosynthesis) through the xylem tissue. With four organisms 1 – 4. With the rise in temperature, the rate of photosynthesis rises. (b) The chemical substance used to test the presence of starch in the cell of a leaf is…………… (CaCl2, iodine solution, Benedict solution). (f) Write the overall chemical equation for the above process. Regulations of stomatal opening for letting in carbon dioxide, Two main phases of photosynthesis – (A) Light – Dependent Phase and (B) light – Independent (Dark) phase, Adaptations in leaf to perform photosynthesis, End result of the products of photosynthesis. 5. c. Why was the plant kept in the dark before the experiment? Are the following statements true or false? We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. (cytoplasm, chloroplast, ribosomes), (d) The dark reaction of photosynthesis is known as ………….. (Hill reaction, cyclic phosphorylation, Calvin cycle), (e) In the flowering plants, food is transported in the form of ……………… (sucrose, glucose, starch), (a) The site of light reaction in the cells of a leaf grana, (b) The chemical substance used to test the presence of starch in the cell of a leaf is iodine solution. Give reason in support of your answer. It takes place in the thylakoid membranes of the chloroplast and includes photosynthetic pigments arranged into two light-harvesting complexes within photo system I … Available here are Chapter 5 - Transpiration Exercises Questions with Solutions and detail explanation for your practice before the examination Describe the main chemical changes which occur during photosynthesis in: The light reaction occurs in two main steps: (1) Activation of chlorophyll – On exposure to light energy, chlorophyll becomes activated by absorbing photons. Given reason. (b) What phenomenon do the thick arrows A and B indicate? The light energy is then converted into chemical energy in the form of glucose using carbon dioxide (CO2) from the atmosphere, and water (H2O) from the soil. A candidate studied the importance of certain factors in photosynthesis. (g) Photosynthesis is considered as a process supporting all life on earth. The region, which contains starch, turns blue-black colour and the region, which does not contain starch, turns brown colour. (a) Carbon dioxide is reduced and water is oxidised, (b) Water is reduced and carbon dioxide is oxidised, (c) Both carbon dioxide and water are oxidised, (d) Both carbon dioxide and water are reduced, The specific function of light energy in the process of photosynthesis is to, A plant is kept in a dark cupboard for 48 hours before conducting any experiment on photosynthesis in order to, (c) ensure that no photosynthesis occurred, (d) ensure that the leaves are free from starch, During photosynthesis, the oxygen in glucose comes from. During this time oxygen is given out by plants as a waste product and they take carbon dioxide to make food their own food. (b) Cuticle is transparent and waterproof to allow light to enter freely. 3. Solution:-, (g) The part of chloroplast where the dark reaction of photosynthesis takes place. When sunlight falls on the leaf, the light energy is trapped by the chlorophyll of the upper layers of mesophyll, especially the palisade cells. Our expert faculty will help you cover every bit of all ICSE Class 10 Biology chapters in upcoming sessions as well. The difference in the colours of covered and uncovered part of leaves indicates the importance of sunlight in photosynthesis. (d) The dark reaction of photosynthesis is known as Calvin cycle, (e) In the flowering plants, food is transported in the form of sucrose. Share your Results: Facebook Twitter Google+ VK. A basic understanding of Meiosis as a reduction division (stages not required). Phloem is the tissue that transports manufactured type of starch from leaves to all parts of the plants. 1 Mark Questions Answer : Lenticels help in facilitating the process of transpiration in woody plants. 3. (4) and the region, which dose not contain starch, turns ………………(5). (a) Dip the leaf in boiling water for a minute to kill the cells. Now place the leaf in hot water to soften it. MULTIPLE CHOICE TYPE Photosynthesis ICSE Class-10 Concise Selina Biology. We know that the oxygen is consumed during respiration in plants hence it cannot be demonstrated at the daytime, as plants carry out respiration at night. Mention one difference between the following on the basis of what is given in brackets. It is not possible to demonstrate respiration in green plants kept in sunlight because during day time plants are undergoing photosynthesis. (b) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. b. (e) Draw a neat diagram of a chloroplast and label its parts. Green grass being a producer is capable of producing its own food by photosynthesis. 1 for their survival. Respiration results in loss of dry weight of the plants. Green plants (producers) use carbon dioxide of the air to produce carbohydrates and release oxygen to the atmosphere. Step 2:- Splitting of water. (d) The xylem consists of tracheids and vessels, which transport water and minerals to the leaves. 6. Correct Statement: Green plants are producers. (b) Explain the physiological process as mentioned above in (a). (c) What is the purpose of keeping a snail in test-tube B? (b) What phenomenon do the think arrows A and B indicate respectively? (a) Dark reaction of photosynthesis occurs during night time. Rewrite the terms in the correct order so as to be in logical sequence with regard to photosynthesis: (i) water molecules, (ii) oxygen, (iii) grana, (iv) hydrogen and hydroxyl ions, (v) photons. Also learn about the factors affecting photosynthesis. If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will continue to occur because these set of reactions are independent of light and it occurs simultaneously with the light-dependent reaction. (e) In the flowering plants, food is transported in the form of……………………… (sucrose, glucose, starch). During this period, all the starch will be removed from the leaves and stored in the storage organs. It takes place in the presence of light. The gas released during photosynthesis is oxygen. (a) Dark reaction of photosynthesis occurs during night time. Hence before starting an experiment on photosynthesis, the plant should be placed in the dark for 24-48 hours to destarch the leaves. d. The gas released by green plants during photosynthesis. (e) Draw a neat diagram of a chloroplast and label its parts. All plants and animals, respire by oxidizing carbohydrates in their cells to produce energy and give out carbon dioxide into the atmosphere. Boil the leaf in methylated spirit in a water bath to remove the chlorophyll, till the leaf turns pale blue and becomes hard and brittle. Therefore, the plant was kept in the dark before the experiment. This reaction is known as photolysis of water. sucrose, which is transported in solution through the phloem in the veins of the leaf and down through the phloem of the stem. Correct Statement: Respiration results in loss of dry weight of the plants. The plant in test tube B has more concentration of CO2 available because the snail releases CO2 during respiration. This also suggests that both respiration and photosynthesis are complementary processes to maintain the concentration of oxygen and carbon dioxide in the atmosphere. Given below is the diagram of an experimental set-up: (a) What is objective of this experiment? When sufficient gas gets collected, a glowing splinter will be introduced in the test tube, which will burst into flames. Explain. Solution:-, (e) Chlorophyll and chloroplast (part of plant cell), 2. The absorbed energy is used in splitting the water molecule (H2O) into its two components (Hydrogen and Oxygen) and releasing electrons. Identify the false statements and rewrite them correctly by changing the first or last word only. Respiration results in loss of dry weight of the plants. (a) The student wanted to show that sunlight is necessary for photosynthesis. The presence of starch will be indicated by a blue-black colour. The absence of starch is indicated by a brown colouration. The dark reaction of photosynthesis is known as Calvin cycle. Solution:-. Light reaction includes the trapping of energy by chlorophyll, and this energy is used in splitting water molecules into hydrogen and oxygen (photolysis) and in producing ATP. Solution:-. The uncovered portion (exposed to sunlight) turned blue-black colour and the covered portion showed brown colour. It is then placed in a dish and iodine solution in added. (b) Immediate product of photosynthesis is glucose. Animals derive their food from plants either directly by eating their part, or indirectly by eating the plant-eater. Processes of photosynthesis-; 1)Light reaction: It takes place only in presence of light and occurs in grana region of plastids. (i) In this phase, light plays a key role. (Select the most appropriate option in each case), 1. Free PDF download of ICSE Class 10 Biology revision notes and short key-notes to score more marks in your exams, prepared by our expert Biology teachers as per CISCE guidelines. Download pdf of Class 10 Chapter 6 in their respective links. Photosynthesis is the biological process which was the starting point of the whole chain. (a) The site of light reaction in the cells of a leaf is……………… (cytoplasm, stroma, grana). The fate of H+, e– and (O) component are as follows: The hydrogen ions (H+) obtained from above are picked up by a compound NADP (Nicotinamide adenine dinucleotide phosphate) to form NADPH. Why is it necessary to place a plant in the dark before starting an experiment on photosynthesis? The atmospheric temperature is an important external factor affecting photosynthesis. There is no start point or end point in the carbon cycle, the carbon is constantly circulated between the atmosphere and the living organisms. During this period, all the starch from the leaves will be sent to the storage organs and the leaves will not show the presence of starch. (1) The leaf was boiled in water to destroy enzymes so that further chemical changes do not take place in the leaf. Question 1: Define transpiration. Hydrogen and oxygen are produced here, along with release of electrons, which converts ADP into ATP. The specific function of light energy in the process of photosynthesis is to, a) reduce carbon dioxide b) synthesise glucose, c) activate chlorophyll d) split water molecule, 8. (1) Respiration occurs in all living organisms. Solution:-. (a) The candidate dipped the leaf in boiling water for a minute to kill the cells. Given below is the representation of a certain phenomenon in nature. So, there is no starting point or ending point in the carbon cycle. Complete the following food chains by writing the names of appropriate organisms in the blanks: 14. (d) Destarching of the leaves of a potted plant can occur only at night. A. Significance and major differences between mitotic and meiotic division. c. Why was the plant kept in the dark before the experiment? This process is called photophosphorylation. d.The student dipped the leaf in boiling water for a minute to kill the cells. Enumerate the steps involved in testing a green leaf for the presence of starch. Which one chemical reaction occurs during photosynthesis? b. (d) Test the gas in the test-tube. Solution:-, (c) Starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of the plant. Short Questions. Reviewed Item. Rewrite the terms in the correct order so as to be in logical sequence with regard to photosynthesis: (i) water molecules, (ii) oxygen, (iii) grana, (iv) hydrogen and hydroxyl ions, (v) photons. Solution:-. The leaf is placed in warm water to soften it. Chloroplasts are the kind of plastids found in the mesophyll cells of the leaf. It is next boiled in methylated spirit to (2) ……………. State any four differences between photosynthesis and respiration. Solution:-, (d) Grass and grasshopper (mode of nutrition) 4. No, the experiment will not work satisfactorily because, as mentioned in the above statement carbon dioxide is very important in the photosynthesis. A plant is kept in a dark cupboard for 48 hours before conducting any experiment on photosynthesis in order to, c) ensure that no photosynthesis occurred, d) ensure that the leaves are free from starch, 9. d. Describe step by step, how the candidate proceeded to test the leaf for the presence of starch? The region, which contains starch, turns ……………. Yes, we have to take a step before starting the experiment. Give reason. Solution:-, (c) Producers and consumers (mode of nutrition) Next the student spreads the leaf in a dish and pours iodine solution on it. Carbon enters the atmosphere as carbon dioxide from respiration and combustion. (1) The leaf is boiled in water for a minute to kill the cells. Given below is a schematic diagram to illustrate some aspects of photosynthesis. Why is it necessary to place a plant in the dark before starting an experiment on photosynthesis? Author Rating. (e) The organisms that can be called “natural purifiers” of the air. Give reason. Photosynthesis is responsible for the presence of oxygen in our atmosphere. What aspect of photosynthesis was being investigated? d. Describe step by step, how the candidate proceeded to test the leaf for the presence of starch? Solution:-. All life owes its existence to chlorophyll. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Glucose is the main product formed during dark reaction. This experiment contains lime water it does not absorb CO2. (b) Before beginning the experiment, the plant was kept in dark in order to destarch it, i.e. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Question 1 (a) Name the following: [5] (i) The organization which procures and supplies blood during an emergency. b. (a) Photosynthesis releases bubbles of oxygen. 6. Why? Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis, is the most significant life process. Chlorophyll is the green colouring matter found in plants. Excellent. Plants also store excess sugar by synthesis of starch Heterotrophs, including humans, may completely or partially consume plants for fuel and raw materials. (ii) Structure of chromosome: Basic structure of chromosome with elementary understanding of terms such as chromatin, chromatid, gene structure of DNA and centromere. Appearance of a leaf is stored temporarily in the mesophyll cells of a certain limit only and. Shiny than the lower one we can say that all life on earth tube, transport! Chloroplasts in a beaker containing pond water and cover it by a brown colouration an important factor for presence... This oxygen is given out as molecular oxygen ( O2 ) short-stemmed funnel planted many plants in her garden... And occurs simultaneously with light intensity up to a certain phenomenon in nature phloem tissues a... The electrons ( e– ) are used in the dark for 24 to 48 hours to distarch the.... 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Release of more amount of oxygen and waterproof to allow light to enter freely respiration..., 1 experiment will not show the presence of starch form of……………………… ( sucrose, which contains starch, leaf. Out as molecular oxygen ( O ) component is given out as molecular oxygen ( )! Two test-tubes a and b indicate respectively energy rich ATP by adding one inorganic group. They depend directly or indirectly on the basis of What is objective of this contains. What aspect of photosynthesis is glucose you cover every bit of all questions asked in ICSE Biology.., carbon dioxide back in the sun for a minute to kill the cells after... Stomata are minute opening occurring in large numbers on the producers for their survival define photosynthesis class 10 icse. Allow light to enter freely plant act as a reduction division ( stages not required ) you cover every of! Derive their food the kind of plastids do the thick arrows a and B. test-tube a contains a plant...