No living being can remain alive without oxygen. (c) Mesophyll cells (both palisade and spongy) in a leaf are the principal centres of the photosynthesis. Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis is the best study material for those students who are finding difficulties in answering the questions. The chemical substance used to test the presence of starch in the cell of a leaf is an iodine solution. Both test-tubes are kept in sunlight. There is no start point or end point in the carbon cycle, the carbon is constantly circulated between the atmosphere and the living organisms. Consumers show heterotrophic mode of nutrition i.e. Given below is the representation of a certain phenomenon in nature. The phenomenon is represented above is the food chain. 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. As mentioned in the above answer, the plant in test tube B has more concentration of CO2 available because the snail releases CO2 during respiration. (2) Respiration is not dependent on light. It is next boiled in methylated spirit to (2) ……………. Test to determine the presence of starch in a leaf: Given alongside is the diagram of an experimental set-up: (a) What is the objective of this experiment? (a) Dark reaction of photosynthesis occurs during night time. d. Describe step by step, how the candidate proceeded to test the leaf for the presence of starch? Invert a test tube full of water over the stem of the funnel. This is because if the plant is not destarched,              then the experiment will give false results because starch stored previously may be                          detected  in the leaf placed in the beaker even if no starch is produced during the                              experiment. The upper surface is thicker than the lower surface and also the epidermis is covered by a waxy, waterproof layer of cuticle. c. The fluid that transports fatty acids and glycerol. (c) Name the biological process which was the starting point of the whole chain. (e) Give an example of a water plant that can be used in the above experiment. Given below is the representation of a certain phenomenon in nature. (b) Then boiled the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. 1. Arrow A indicates Transpiration and arrow B indicates the ascent of sap. If so, state it. Hence, it is difficult to demonstrate respiration as these two processes occur simultaneously. This also suggests that both respiration and photosynthesis are complementary processes to maintain the concentration of oxygen and carbon dioxide in the atmosphere. Some of the oxygen may be used in respiration in the leaf cells (the phenomenon is called photorespiration), but the major portion of it is not required and it diffuses out into the atmosphere through the stomata. 9. they are able to produce their own food from basic raw materials. The rate of photosynthesis is not affected by, a) breaking down water into hydrogen and oxygen. Section I (40 Marks) Attempt all questions from this Section. Grass is a producer. (a) The candidate dipped the leaf in boiling water for a minute to kill the cells. Fixation and reduction of carbon dioxide occurs in the stroma of the chloroplast through a series of reactions. Also most of the oxygen produced during photosynthesis diffuses out into the atmosphere through the stomata. (e) Phloem tissue in Leaf Veins Oct 16 • Board Sample Papers • 6131 Views • 1 Comment on ICSE Sample Paper of Biology Class 10 Indian Certificate of Secondary Education ( ICSE ) is an examination conducted by the Council for the Indian School Certificate Examinations which is a private non-governmental board of school education in India for class X. (e) Give an example of a water plant that can be used in the above experiment. The potted plant was kept in the dark for 24 hours. Bubbles of the gas will collect in the test-tube. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to distarch the leaves. In photosynthesis solar energy (sunlight) is converted to chemical energy and is stored in plants as starch. Extramarks, an e-learning website offers online tutorials for ICSE class 10 Experiments on Transpiration Chapter. When sunlight falls on the leaf, the light energy is trapped by the chlorophyll of the upper layers of mesophyll, especially the palisade cells. (f) Photosynthesis results in loss of dry weight of the plants. The chloroplasts are concentrated in the upper layers of the leaf which helps cells to trap the sunlight quickly. Green grass being a producer is capable of producing its own food by photosynthesis. (b) The outside atmospheric temperature has no effect on the rate of photosynthesis. (d) Test the gas in the test-tube. 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. This layer is thicker on the upper surface than the lower one. Photosynthesis requires CO2 as the substrate in green plants. Answer the questions that follow: (a) Name the physiological process that releases the bubbles of oxygen. Animals are heterotrophic (different nutrition). The raw materials for the photosynthesis are water, carbon dioxide and sunlight. Give reason. The number of water molecules required in the chemical reactions to produce one molecule of glucose during photosynthesis is, 3. (c) What is the purpose of keeping a snail in test-tube B? Question 1. This increases the rate of photosynthesis in the plant placed in test tube B which leads to the release of more amount of oxygen. (a) Place some water plants (Elodea or Hydrilla) in a beaker containing pond water and cover them by a short-stemmed funnel. Our expert faculty will help you cover every bit of all ICSE Class 10 Biology chapters in upcoming sessions as well. The leaves will not show the presence of starch. To register Biology Tuitions on Vedantu.com to clear your doubts. A potted plant was taken in order to prove a factor necessary for photosynthesis. One of the leaves was covered with black paper in the centre. 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. Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment. 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. 9. Solution:-. Good. (g) Photosynthesis stops at a temperature of about 35oC. Correct Statement: Respiration results in loss of dry weight of the plants. (c) Mesophyll cells: Mesophyll cells are the main sites for photosynthesis. (c) Carbon dioxide released by the snail during respiration is used by the plant for photosynthesis. Photons, grana, water molecules, hydrogen and hydroxyl ions, oxygen. 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. Hence before starting an experiment on photosynthesis, the plant should be placed in the dark for 24-48 hours to destarch the leaves. (c) If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesise in bright sunshine. 3. Explain. Question 1. (b) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. Chloroplasts are minute oval bodies bounded by a double membrane, and their interior contains closely packed flattened sacs (thylakoids) arranged in piles (grana) lying in a colourless ground substance called the stroma. To register for our free webinar class with best Biology tutor in India. So the various experiments on photosynthesis can be carried out effectively. (h) Photosynthesis occurs only in cells containing chloroplasts. Our specialist teachers have answered these exercises to help you with your exam preparation to achieve good marks in the subject. (b) Cuticle is transparent and waterproof to allow light to enter freely. A leaf without starch will show brown colouration. 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. A series of chemical reactions occur in very quick succession, initiated by light and therefore, the phase is called the photochemical phase. b. The gas released during photosynthesis is oxygen. Which one chemical reaction occurs during photosynthesis? 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. (b) Before beginning the experiment, the plant was kept in dark in order to destarch it, i.e. Thus, we can say that all life owes its existence to chlorophyll. (b) Cuticle 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. Solution:-. A candidate studied the importance of certain factors in photosynthesis. This experiment contains lime water it does not absorb CO2. Photosynthesis prepared by Academic team of Entrancei . Solution:-. Photosynthesis is the only biological process which releases oxygen into the atmosphere. The potted plant was then placed in sunlight for a few hours. Name the following: a. Visit official Website CISCE  for detail information about ICSE Board Class-10. All other organisms, directly or indirectly depend on this food for their survival. ICSE Class 10 Biology 2018 Question Paper Class 10 Biology You have to attempt all questions from Section I and any four questions from Section II. (a) To demonstrate the importance of carbon dioxide in photosynthesis. Yes, we have to take a step before starting the experiment. Hydrogen and oxygen are produced here, along with release of electrons, which converts ADP into ATP. Bubbles appear in the stem which rise and are collected in the test tube. However, in a sense, even this oxygen is not a waste because all organisms require it for their existence including the plants. 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. (f) Stomata: The main function of stoma is to let in carbon dioxide from the atmosphere for photosynthesis. Photosynthesis increases with the light intensity up to a certain limit only and then it gets stabilized. Respiration. (1) The leaf was boiled in water to destroy enzymes so that further chemical changes do not take place in the leaf. (g) The part of chloroplast where the dark reaction of photosynthesis takes place. The potted plant was kept in the dark for 24 hours. (c) The compound which stores energy in the cells. (f) Stomata. This matter comes from dead animals and plants, which in their own turn were dependent on photosynthesis. 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. Fill in the blanks with the appropriate answer from the choices given in the brackets. (c) During the starch test, why was the leaf. Glucose is the main product formed during dark reaction. (a) The site of light reaction in the cells of a leaf is ………… (cytoplasm, stroma, grana), (b) The chemical substance used to test the presence of starch in the cell of a leaf is …………. Respiration results in loss of dry weight of the plants. Producers show autotrophic mode of nutrition i.e. (CaCl2, iodine solution, Benedict solution), (c) Stroma is ground substance in ……………. Photosynthesis occurs in plants and some bacteria. (g) Photosynthesis stops at a temperature of about 35oC. Photosynthesis definition states that the process exclusively takes place in the chloroplasts through photosynthetic pigments such as chlorophyll a, chlorophyll b, carotene and xanthophyll. (4) The carbon dioxide is used and released in the process of photosynthesis. It is then placed in a dish and …………. (g) Photosynthesis is considered as a process supporting all life on earth. (c) Place the apparatus in the sun for a few hours. 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. During this period, all the starch will be removed from the leaves and stored in the storage organs. Solution:-. These Photosynthesis solutions are available for download in pdf format and provide solutions to all the questions provided in Class 10 Biology Chapter 6, wherein questions are answered step by step with detailed explanations. Solution:-. 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. 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. (ii) Structure of chromosome: Basic structure of chromosome with elementary understanding of terms such as chromatin, chromatid, gene structure of DNA and centromere. Oxygen supports all life on earth. Now place the leaf in hot water to soften it. The glucose produced is either immediately used up by the cells or stored in the form of starch. Chlorophyll is the foundation site for the photosynthesis in green plants. (b)The oxygen (O) component is given out as molecular oxygen (O2). (3) solution in added. Dip a leaf in boiling water for a minute to kill the cells. The site of light reaction in the cells of a leaf is grana. If green plants were to suddenly disappear, then so would virtually all life on Earth. Poor. 7. The initiation of photosynthesis takes place when the chlorophyll molecule traps the light energy. A glowing splinter bursts into a flame which shows the presence of oxygen. 11. (a) What aspect of photosynthesis was being tested? 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