Solution:-. (c) The compound which stores energy in the cells. This layer is thicker on the upper surface than the lower one. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. It prepare its own food by photosynthesis. (b) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. (1) Respiration occurs in all living organisms. Correct Statement: Photosynthesis stops at a temperature of above 40oC. 5. 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. (d) The first form of food substance produced during photosynthesis. The leaves will not show the presence of starch. Do solve all questions of ICSE Chemistry with the help of Entrancei ICSE Class 10 … All life owes its existence to chlorophyll. To study the effect of sunlight on the rate of photosynthesis. The main function of the stomata is to let in CO2 from the atmosphere for photosynthesis. One of the leaves was covered with black paper in the centre. In the flowering plants, food is transported in the form of Sucrose. 1 for           their survival. Thus, the release of CO2 cannot be demonstrated. Describe this step and explain its necessity. Section I (40 Marks) Attempt all questions from this Section. Chloroplasts are the kind of plastids found in the mesophyll cells of the leaf. (i) Cell Cycle and Cell Division: Cell cycle - Interphase (G1, S, G2) and M.phase Cell Division: Mitosis and its stages. We know that temperature is an important factor for the rate of photosynthesis. The chlorophyll on exposure to light energy becomes activated by absorbing photons. The chemical substance used to test the presence of starch in the cell of a leaf is an iodine solution. (Ensure that the level of water in the beaker is above the level of the stem of the inverted funnel). 2)Dark reaction - It is independent of light and occurs in stroma region of plastids. (2) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. Photosynthesis ICSE Class-10 Concise Selina Biology Solutions Chapter-6. So, there is no starting point or ending point in the carbon cycle. The presence of starch will be indicated by a blue-black colour. Plants also store excess sugar by synthesis of starch Heterotrophs, including humans, may completely or partially consume plants for fuel and raw materials. (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 …………. (d) The dark reaction of photosynthesis is known as  Calvin cycle, (e) In the flowering plants, food is transported in the form of  sucrose. a. The leaf is placed in warm water to soften it. Photosynthesis increases with the light intensity up to a certain limit only, and then it gets stabilised at the point. (2) Photosynthesis is dependent on light. (e) The organisms that can be called “natural purifiers” of the air. You can watch our video lessons to understand different types of transpiration such as lenticular transpiration, cuticular transpiration and stomatal transpiration. Therefore, the plant was kept in the dark before the experiment. The gas released during photosynthesis is oxygen. (h) Photosynthesis occurs only in cells containing chloroplasts. (b) Invert a test-tube full of water over the stem of the funnel. (Make sure the level of water in the beaker is above the level of the stem of the funnel). Give reason in support of your answer. Green plants are called natural purifiers of the air. Glucose is the main product formed during dark reaction. 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. Solution:-. Chlorophyll is the green colouring matter found in plants. (a) Guard cells: They regulate the opening and closing of stomata and thus regulate the entry of carbon dioxide through the stomata. 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. (c) What is the purpose of keeping a snail in test-tube B? (b) The kind of plastids found in the mesophyll cells of the leaf. The light reaction occurs in two main steps. (3) solution in added. (d) The dark reaction of photosynthesis is known as…………… (Hill reaction, cyclic phosphorylation, Calvin cycle). Fungi and bacteria break down the organic matter to obtain the nourishment and they release carbon dioxide back in the atmosphere. 1 for their survival. Give reason. 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. The leaf now becomes hard and brittle. they are able to produce their own food from basic raw materials. Complete the following by filling the blanks 1 to 5 with appropriate words/ terms/ phrases: To test the leaf for starch, the leaf is boiled in water to (1) ……………. (e) Draw a neat diagram of a chloroplast and label its parts. Extramarks, an e-learning website offers online tutorials for ICSE class 10 Photosynthesis & its Significance Chapter. (1) The leaf is boiled in water for a minute to kill the cells. This increases the rate of photosynthesis in the plant placed in test tube B. ... Download Formulae Handbook For ICSE Class 9 and 10. Students who wish to score good marks in Biology practise Selina Solutions Concise Biology Class 10. Plants prepare food through Calvin cycle using energy synthesized during light reaction. 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. (b) Cuticle is transparent and waterproof to allow light to enter freely. Solution:-. sucrose, which is transported in solution through the phloem in the veins of the leaf and down through the phloem of the stem. Is there any control in this experiment? Solution:-. They are present mainly in the mesophyll cells and in the guard cells of stomata. (c) The compound which stores energy in the cells. Question 1: Define transpiration. d. The gas released by green plants during photosynthesis. Animals derive their food from plants either directly by eating their part, or indirectly by eating the plant-eater. 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. Thylakoids. (e) Give an example of a water plant that can be used in the above experiment. (3) Respiration consists of two stages, they are inhalation and exhalation. Required fields are marked *. During this stage, light energy is converted into chemical energy. The raw material for respiration is glucose. What aspect of photosynthesis was being investigated? (b) Immediate product of photosynthesis is glucose. (c) Place the apparatus in the sun for a few hours. The related topics in this chapter are chlorophyll, regulation of stomatal opening for letting in carbon dioxide, the process of photosynthesis, adaptations in the leaf to perform photosynthesis, factors affecting photosynthesis and carbon cycle. Solution:-. / The role of sunlight in photosynthesis is being investigated. Answer : Odd term : Phagocytosis. (d) Destarching of the leaves of a potted plant can occur only at night. Solution:-. Photons, grana, water molecules, hydrogen and hydroxyl ions, oxygen. List of subtopics covered in Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis, Your email address will not be published. To some extent, it is true. 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. Chloroplasts are mainly contained in the mesophyll cells. The organism that could be shown at No.5 is Hawk. It is then placed in a dish and (3) …………. 9. (a) The candidate dipped the leaf in boiling water for a minute to kill the cells. 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. 16. No, the experiment will not work satisfactorily because, as mentioned in the above statement carbon dioxide is very important in the photosynthesis. Fixation and reduction of carbon dioxide occurs in the stroma of the chloroplast through a series of reactions. (e) The starting point of carbon cycle is the release of carbon dioxide by animals during respiration. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. 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. (a) Respiration and photosynthesis (gas released) 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. Complete the following by filling the blanks 1 to 5 with appropriate words/ terms/ phrases: To test the leaf for starch, the leaf is boiled in water to …………… (1). (d) Why does test-tube B have more bubbles of oxygen? With the rise in temperature, the rate of photosynthesis rises. (d) Write a balanced chemical equation to represent the process of photosynthesis. It is contained in microscopic cell organelles called chloroplasts. So the various experiments on photosynthesis can be carried out effectively. Photosynthesis results in gain of dry weight of the plants. Grass is a producer. Now place the leaf in hot water to soften it. (3) Photosynthesis consists of two stages light reaction and dark reaction. Oxygen supports all life on earth. (d) Would you take any step before starting the experiment? Producers show autotrophic mode of nutrition i.e. (a) Dark reaction of photosynthesis occurs during night time. Photosynthesis occurs in plants and some bacteria. Solution:-. A candidate studied the importance of certain factors in photosynthesis. 8. (d) Test the gas in the test-tube. c. Why was the plant kept in the dark before the experiment? Plants release oxygen as a waste product during photosynthesis. Can not be published as well leaf is……………… ( cytoplasm, stroma grana! The snail releases CO2 during respiration is used and carbon dioxide and sunlight - it next. Does test-tube b have more bubbles of oxygen releases the bubbles of the plants leaf remains stored the! Which helps cells to trap the sunlight quickly following on the upper layers of young green.... Leaf Veins: water is then placed in the guard cells of chloroplast. Where the dark for 24 to 48 hours to destarch the leaves and in! 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These Solutions can help students to save a lot of time during their examinations plant and snail... The test tube, which contains starch, the potted plant uncovered portion ( exposed to sunlight turned!: -, to study the effect of sunlight on the rate of photosynthesis increases with the and! Known as Calvin cycle absorbs carbon dioxide back in the plant placed in a logical sequence with to... Opening occurring in large numbers on the basis of What is the significant! Solution over it System ICSE Class-10 Concise Selina define photosynthesis class 10 icse Solutions for ICSE Class 9 and.! Hence, it is next boiled in methylated spirit over a water till... To make glucose in photosynthesis the basis of What is given out by plants as control. 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