Oxygen released during photosynthesis is released into the atmosphere through stomata present on the leaves while the ATP and NADPH molecules are used in the synthesis of carbohydrate from carbon dioxide and water. 6. 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. Solution:-, To study the effect of sunlight on the rate of photosynthesis. Practice biology sample question papers to score high in exams. (a) Dark reaction of photosynthesis occurs during night time. Required fields are marked *. to remove the pre-existing starch from the storage organs. (b) The chemical substance used to test the presence of starch in the cell of a leaf is…………… (CaCl2, iodine solution, Benedict solution). Glucose is the main product formed during dark reaction. Consumers show heterotrophic mode of nutrition i.e. 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. CO2 is also the product of respiration. (b) Cuticle: Cuticle is transparent and water proof due to which light can penetrate this later easily. Explain. In the darkness, respiration alone is responsible for changes in the gaseous composition of the plant’s surrounding atmosphere. 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) ……………. (g) Photosynthesis stops at a temperature of about 35oC. Solution:-, (f) Photosynthesis results in loss of dry weight of the plants. The pigment chlorophyll is contained in the walls of thylakoids. 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. (c) What is the purpose of keeping a snail in test-tube B? Both test-tubes are kept in sunlight. Test-tube B contains both a green water plant and a snail. Bubbles of the gas will collect in the test-tube. (c) During the starch test, why was the leaf. To test the leaf for starch, the leaf is boiled in water to kill the cells. (b) What phenomenon do the think arrows A and B indicate respectively? (d) The dark reaction of photosynthesis is known as…………… (Hill reaction, cyclic phosphorylation, Calvin cycle). Hence, it is difficult to demonstrate respiration as these two processes occur simultaneously. Plants prepare food through Calvin cycle using energy synthesized during light reaction. A candidate studied the importance of certain factors in 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. Fungi and bacteria break down the organic matter to obtain the nourishment and they release carbon dioxide back in the atmosphere. Enumerate the steps involved in testing a green leaf for the presence of starch. (d) Spread the leaf in a dish and pour iodine solution on it. Give reason in support of your answer. (c) Place the apparatus in the sun for a few hours. (c) Stroma is ground substance in  chloroplast. (Ensure that the level of water in the beaker is above the level of the stem of the inverted funnel). (e) The phloem transports the photosynthetic products from the leaf to the other parts of the plant. Mention one difference between the following on the basis of what is given in brackets. (a) The site of light reaction in the cells of a leaf is……………… (cytoplasm, stroma, grana). Question 1. (a)  Fill up the gaps, in blank spaces (1-4), by writing the names of the correct items. (h) The tissue that transports manufactured type of starch from leaves to all parts of the plants. Most leaves have the upper surface more green and shiny than the lower one. The chloroplasts are concentrated in the upper layers of the leaf which helps cells to trap the sunlight quickly. 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. It is next boiled in methylated spirit to (2) ……………. Green plants are called natural purifiers of the air. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to distarch the leaves. (b)The oxygen (O) component is given out as molecular oxygen (O2). A. Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment. (d) Name one natural element which all the organisms 2-4 and even 5 are getting from No. Solution:-. The presence of starch will be indicated by a blue-black colour. Why is it necessary to place a plant in the dark before starting an experiment on photosynthesis? (4) and the region, which dose not contain starch, turns ………………(5). 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. (d) Photosynthesis requires enzymes. The difference in the colours of covered and uncovered part of leaves indicates the importance of sunlight in photosynthesis. Solution:-. (3) Chemical equation for the process of photosynthesis: The diagram below shows two test-tubes A and B. Test-tube A contains a green water plant. Extramarks, an e-learning website offers online tutorials for ICSE class 10 Experiments on Transpiration Chapter. Test-tube B contains both a green water plant and a snail. The light reaction occurs in two main steps. Bubbles appear in the stem which rise and are collected in the test tube. 5. (ii) Dark reaction. One of the leaves was covered with black paper in the centre. (c) The compound which stores energy in the cells. All other organisms, directly or indirectly depend on this food for their survival. Stroma is the ground substance in the chloroplast. (c) Name the biological process which was the starting point of the whole chain. (d) The first form of food substance produced during photosynthesis. Extra Questions for Class 10 Science Chapter 6 Value Based Questions. The absorbed energy is used in splitting the water molecule (H2O) into its two components (Hydrogen and Oxygen) and releasing electrons. Oxygen is used up and carbon dioxide is released. 16. (a)The hydrogen ions (H+) are picked up by a compound NADP (Nicotinamide adenine dinucleotide phosphate) to form NADPH. solution in added. Solution:-. March 1, 2019 / by shiksha. Given below is the diagram of an experimental set-up: (a) What is objective of this experiment? 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.. (c) Starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of the plant. (b) Before beginning the experiment, the plant was kept in dark in order to destarch it, i.e. All plants and animals, respire by oxidizing carbohydrates in their cells to produce energy and give out carbon dioxide into the atmosphere. The leaves will not show the presence of starch. (b) Immediate product of photosynthesis is glucose. Therefore, the plant was kept in the dark before the experiment. A candidate studied the importance of certain factors in photosynthesis. Your email address will not be published. Draw a neat diagram of the stomatal apparatus found in the epidermis of leaves and label the Stoma, Guard cells, Chloroplast, Epidermal cells, Cell wall and Nucleus. Raksha planted many plants in her home garden as she knew that the plants help to purify air. 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. Dip a leaf in boiling water for a minute to kill the cells. 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. Answer : Odd term : Phagocytosis. (h) Photosynthesis occurs only in cells containing chloroplasts. 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. 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. 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, 7. (d) Write a balanced chemical equation to represent the process of photosynthesis. It takes place in the presence of light. Solution:-. 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. The starting point of any food chain is always a plant. During this period, all the starch will be removed from the leaves and stored in the storage organs. 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. Respiration results in loss of dry weight of the plants. Chlorophyll is the foundation site for the photosynthesis in green plants. 2)Dark reaction - It is independent of light and occurs in stroma region of plastids. (i) Cell Cycle and Cell Division: Cell cycle - Interphase (G1, S, G2) and M.phase Cell Division: Mitosis and its stages. So, there is no starting point or ending point in the carbon cycle. 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. (c) Name the biological process which was the starting point of the whole chain. Solution:-. (d) Why does test-tube B have more bubbles of oxygen? (b) Why was the plant placed in the dark before beginning the experiment? Given below is the representation of a certain phenomenon in nature. 11. (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. (c) Stroma is the ground substance in …………… (cytoplasm, chloroplast, ribosomes). Ordinarily, there may be 40-50 chloroplasts in a cell. and the region, which does not contain starch, turns (5) ………………. He then places the leaf in hot water to soften it. (v) photons, (iii) grana, (i) water molecules, (iv) hydrogen and hydroxyl ions, (ii) oxygen. (b) The outside atmospheric temperature has no effect on the rate of photosynthesis. The plant in test tube B has more concentration of CO2 available because the snail releases CO2 during respiration. If a green plant is kept in bright light, it tends to use up all the CO2 produced during respiration, for photosynthesis. The leaves will not show the presence of starch. Chlorophyll is the green pigment present in cell organelles called chloroplasts. Chloroplasts are the kind of plastids found in the mesophyll cells of the leaf. During this period, all the starch will be removed from the leaves and stored in the storage organs. (d) The xylem consists of tracheids and vessels, which transport water and minerals to the leaves. (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). When sufficient gas gets collected, a glowing splinter will be introduced in the test tube, which will burst into flames. The number of water molecules required in the chemical reactions to produce one molecule of glucose during photosynthesis is, 3. Good. These notes are totally based on latest Biology textbook of ICSE Board. Photosynthesis occurs in plants and some bacteria. 5. (b) Name any one organism that could be shown at No.5. The raw material for respiration is glucose. (d) The first form of food substance produced during photosynthesis. A single vascular bundle, no matter how large or small, always contains both xylem and phloem tissues. 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. (e) Give an example of a water plant that can be used in the above experiment. (2) Photosynthesis is dependent on light. Grasshopper is a primary consumer (herbivore) and directly feeds on producers like grass. Identify the false statements and rewrite them correctly by changing the first or last word only. Describe the main chemical changes which occur during photosynthesis in: (b) Will it work satisfactorily? To register Biology Tuitions on Vedantu.com to clear your doubts. It is not possible to demonstrate respiration in green plants kept in sunlight because during day time plants are undergoing photosynthesis. This rise occurs up to the optimum temperature of 35oC (maximum suitable temperature when the photosynthesis occurs best) after which falls and stops above 40 Co. (c) If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesize in bright sunshine. These ICSE Class 10 Biology Chapter 6 Photosynthesis Revision Notes will definitely help students to save a lot of time during their examinations. If so, state it. The rate of photosynthesis is not affected by, a) breaking down water into hydrogen and oxygen. 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. ... Download Formulae Handbook For ICSE Class 9 and 10. The male hormone produced by the interstitial cells. Explain briefly the role of the following structures in this process. This also suggests that both respiration and photosynthesis are complementary processes to maintain the concentration of oxygen and carbon dioxide in the atmosphere. (b) No, the experiment will not work satisfactorily, as the beaker contains lime water and not                   potassium hydroxide to absorb CO­2. It prepare its own food by photosynthesis. Solution:-. The region, which contains starch, turns (4) ……………. During this stage, light energy is converted into chemical energy. The leaf now becomes hard and brittle. (e) The organisms that can be called “natural purifiers” of the air. 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. d.The student dipped the leaf in boiling water for a minute to kill the cells. (b) Cuticle is transparent and waterproof to allow light to enter freely. The leaf becomes hard and brittle. Answer : Photolysis in photosynthesis is the splitting of water molecules into hydrogen ions and hydroxyl ions in the presence of chlorophyll and light. So the various experiments on photosynthesis can be carried out effectively. The region, which contains starch, turns blue-black and the region, which does not contain starch, turns brown. “Oxygen is a waste product of photosynthesis.” Comment. 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. (1) The leaf was boiled in water to destroy enzymes so that further chemical changes do not take place in the leaf. 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, The number of water molecules required in the chemical reactions to produce one molecule of glucose during photosynthesis is, The rate of photosynthesis is not affected by, (a) breaking down water into hydrogen and oxygen. The gas released during respiration is carbon dioxide. Also the epidermis is covered by a waxy, waterproof layer of cuticle. Fixation and reduction of carbon dioxide occurs in the stroma of the chloroplast through a series of reactions. b. Question 1: Define transpiration. Chloroplasts are mainly contained in the mesophyll cells. (g) The part of chloroplast where the dark reaction of photosynthesis takes place. (f) Stomata are minute opening occurring in large numbers on the lower surface of a leaf. c. Why was the plant kept in the dark before the experiment? (3) Photosynthesis consists of two stages light reaction and dark reaction. Hence most leaves have the upper surface more green and shiny than the lower one. Photosynthesis increases with the light intensity up to a certain limit only, and then it gets stabilised at the point. 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