define photosynthesis class 10 icse

Correct Statement: Dark reaction of photosynthesis is independent of light and occurs simultaneously with light reaction. The leaf now becomes hard and brittle. Complete the following food chains by writing the names of appropriate organisms in the blanks: (ii) Grass/Corn → Mouse → Snake → Peacock. (g) Photosynthesis is considered as a process supporting all life on earth. Answer : Photolysis in photosynthesis is the splitting of water molecules into hydrogen ions and hydroxyl ions in the presence of chlorophyll and light. Chloroplasts are cell organelles, situated in the cytoplasm of plant cells. All life owes its existence to chlorophyll. Given below is a schematic diagram to illustrate some aspects of photosynthesis. Answer : Odd term : Phagocytosis. Animals are heterotrophic (different nutrition). Identify the false statements and rewrite them correctly by changing the first or last word only. ShikshaHouse. (d) Write a balanced chemical equation to represent the process of 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. Most leaves have the upper surface more green and shiny than the lower one. Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis, is the most significant life process. (ii) Structure of chromosome: Basic structure of chromosome with elementary understanding of terms such as chromatin, chromatid, gene structure of DNA and centromere. (b) Will it work satisfactorily? To register for our free webinar class with best Biology tutor in India. This experiment contains lime water it does not absorb CO2. 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) Why does test-tube B have more bubbles of oxygen? 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. (f) Write the overall chemical equation for the above process. Solution:-, (c) Producers and consumers (mode of nutrition) Invert a test tube full of water over the stem of the funnel. It is not possible to demonstrate respiration in green plants kept in sunlight because during day time plants are undergoing photosynthesis. (c) Mesophyll cells: Mesophyll cells are the main sites for photosynthesis. Hydrogen and oxygen are produced here, along with release of electrons, which converts ADP into ATP. (b) Immediate product of photosynthesis is glucose. (i) Light reaction 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. Photosynthesis is the biological process which was the starting point of the whole chain. 9. 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 A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. sucrose, which is transported in solution through the phloem in the veins of the leaf and down through the phloem of the stem. Chloroplasts are minute oval bodies bounded by a double membrane, and their interior contains closely packed flattened sacs arranged in piles lying in a colourless ground substance called the stroma. (a) Dark reaction of photosynthesis occurs during night time. To register Biology Tuitions on Vedantu.com to clear your doubts. During this period, all the starch will be removed from the leaves and stored in the storage organs. 1 Mark Questions Answer : Lenticels help in facilitating the process of transpiration in woody plants. 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 basic understanding of Meiosis as a reduction division (stages not required). This reaction is known as photolysis of water. Excellent. Most leaves have the upper surface more green and shiny than the lower one. (b) Before beginning the experiment, the plant was kept in dark in order to destarch it, i.e. (g) Photosynthesis stops at a temperature of about 35oC. The leaf now becomes hard and brittle. Therefore, the plant was kept in the dark before the experiment. The region, which contains starch, turns (4) ……………. Green plants are called natural purifiers of the air. Fungi and bacteria break down the organic matter to obtain the nourishment and they release carbon dioxide back in the atmosphere. Hence, it is difficult to demonstrate respiration as these two processes occur simultaneously. (c) Mesophyll cells (1) The leaf is boiled in water for a minute to kill the cells. Photosynthesis requires CO2 as the substrate in green plants. (c) Stroma is ground substance in chloroplast. 2)Dark reaction - It is independent of light and occurs in stroma region of plastids. (3) Photosynthesis consists of two stages light reaction and dark reaction. 2019-03-01. Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. Solution:-. To test the leaf for starch, the leaf is boiled in water to kill the cells. 3. Fill in the blanks with the appropriate answer from the choices given in the brackets. The leaves will not show the presence of starch. (f) Stomata are minute opening occurring in large numbers on the lower surface of a leaf. Oxygen is released as a by-product. Available here are Chapter 5 - Transpiration Exercises Questions with Solutions and detail explanation for your practice before the examination Yes. Therefore, they are called autotrophs (self-nutrition). Solution:-. Grasshopper is a primary consumer (herbivore) and directly feeds on producers like grass. Average . Given below is a schematic diagram to illustrate some aspects of photosynthesis. 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. It is contained in microscopic cell organelles called chloroplasts. 2. solution in added. 1 for their survival. (c) Name the biological process which was the starting point of the whole chain. Significance and major differences between mitotic and meiotic division. (g) The part of chloroplast where the dark reaction of photosynthesis takes place. The difference in the colours of covered and uncovered part of leaves indicates the importance of sunlight in photosynthesis. Also the epidermis is covered by a waxy, waterproof layer of cuticle. Give reason. Short Questions. Fixation and reduction of carbon dioxide occurs in the stroma of the chloroplast through a series of 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. Given below is the representation of a certain phenomenon in nature. Solution:-, To study the effect of sunlight on the rate 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, 2. State any four differences between photosynthesis and respiration. All other organisms, directly or indirectly depend on this food for their survival. The presence of starch is indicated by a blue-black colour. However, in a sense, even this oxygen is not a waste because all organisms require it for their existence including the plants. Given below are five terms. Photosynthesis 10th Science ICSE Chapter 31 Marketing along with videos,solved papers and worksheets.These are helpful for students in doing homework or preparing for the exams Chlorophyll is the foundation site for the photosynthesis in green plants. Solution:-, (g) The part of chloroplast where the dark reaction of photosynthesis takes place. Answer the questions that follow: (a) Name the physiological process that releases the bubbles of oxygen. 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. Students who wish to score good marks in Biology practise Selina Solutions Concise Biology Class 10. (c) Place potassium hydroxide in the beaker instead of lime water. The leaves will not show the presence of starch. (3) solution in added. 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. 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. (4) and the region, which dose not contain starch, turns ………………(5). It is next boiled in methylated spirit to remove chlorophyll. PLAY AGAIN! and the region, which does not contain starch, turns (5) ………………. The leaf is placed in warm water to soften it. (b) The outside atmospheric temperature has no effect on the rate of photosynthesis. He then places the leaf in hot water to soften it. (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. (d) Write a balanced chemical equation to represent the process of photosynthesis. 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. 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. In the dark reaction, ATP and NADPH molecules (produced during light reaction) are used to produce glucose (C6H12O6) from carbon dioxide. (Make sure the level of water in the beaker is above the level of the stem of the funnel). The blood vessels supplying blood to the kidney. How do non-green plants such as fungi and bacteria obtain their nourishment? The time gap between the light and dark reaction is less than one thousandth of a second. All plants and animals, respire by oxidizing carbohydrates in their cells to produce energy and give out carbon dioxide into the atmosphere. 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. 6. So, oxygen is not a waste of photosynthesis because all organisms require it for their existence including the plants. “Oxygen is a waste product of photosynthesis.” Comment. they are able to produce their own food from basic raw materials. (CaCl2, iodine solution, Benedict solution), (c) Stroma is ground substance in ……………. The organism that could be shown at No.5 is Hawk. The main function of the stomata is to let in CO2 from the atmosphere for photosynthesis. (c) What is the purpose of keeping a snail in test-tube B? (d) Would you take any step before starting the experiment? (b) Cuticle: Cuticle is transparent and water proof due to which light can penetrate this later easily. What aspect of photosynthesis was being investigated? Most leaves have the upper surface more green and shiny than the lower one because chloroplasts and stomata are concentrated in the upper layers of the leaf which helps cells to trap the sunlight quickly. Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis, is the most significant life process. (c) Carbon dioxide released by the snail during respiration is used by the plant for photosynthesis. How would you demonstrate that green plants release oxygen when exposed to light? The region, which contains starch, turns ……………. (b) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. Get free Selina Solutions for Concise Biology Class 10 Icse Chapter 5 Transpiration solved by experts. The presence of starch will be indicated by a blue-black colour. Mention one difference between the following on the basis of what is given in brackets. During this time oxygen is given out by plants as a waste product and they take carbon dioxide to make food their own food. The leaf is placed in warm water to soften it. The region, which contains starch, turns blue-black colour and the region, which does not contain starch, turns brown colour. The water is then distributed in the mesophyll tissue. A potted plant was taken in order to prove a factor necessary for photosynthesis. Extramarks, an e-learning website offers online tutorials for ICSE class 10 Experiments on Transpiration Chapter. (c) Stroma is the ground substance in …………… (cytoplasm, chloroplast, ribosomes). (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) Photosynthesis is a physiological process by which plant cells containing chlorophyll produce food in the form of carbohydrates by using carbon dioxide, water and light energy. (2) Respiration is not dependent on light. (c) What alteration(s) will you make in it for obtaining expected result? (a) The rate of photosynthesis continues to rise as long as the intensity of light rises. The gas released during photosynthesis is oxygen. Give reason in support of your answer. (h) Photosynthesis occurs only in cells containing chloroplasts. Solution:-. Solution:-. 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. The chloroplasts are concentrated in the upper layers of the leaf which helps cells to trap the sunlight quickly. (a) To demonstrate the importance of carbon dioxide in photosynthesis. Author Rating. The potted plant was kept in the dark for 24 hours. Starch produced in the leaf remains stored in it until the night before it is used by other parts of the plant. Solution:-. Excretory System ICSE Class-10 Concise Selina Biology Solutions for ICSE Class 10 Chapter-9. With the rise in temperature, the rate of photosynthesis rises. Correct Statement: Photosynthesis stops at a temperature of above 40oC. d. Describe step by step, how the candidate proceeded to test the leaf for the presence of starch? c. The fluid that transports fatty acids and glycerol. (d) A plant and a snail are kept in test tube B. b. A glowing splinter bursts into a flame which shows the presence of oxygen. Extra Questions for Class 10 Science Chapter 6 Value Based Questions. Chlorophyll is the green colouring matter found in plants. During this period, all the starch will be removed from the leaves and stored in the storage organs. 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. Respiration occurs in all living organisms. c. Why was the plant kept in the dark before the experiment? Hence most leaves have the upper surface more green and shiny than the lower one. If green plants were to suddenly disappear, then so would virtually all life on Earth. Practice biology sample question papers to score high in exams. 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. (e) The starting point of carbon cycle is the release of carbon dioxide by animals during respiration. Photosynthesis is an important activity of all green plants which are able to synthesis food from carbon dioxide and water in the presence of chlorophyll and light energy. In photosynthesis solar energy (sunlight) is converted to chemical energy and is stored in plants as starch. 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(4) The oxygen is used and carbon dioxide is released in the process of respiration. (2) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. Share your Results: Facebook Twitter Google+ VK. A candidate studied the importance of certain factors in photosynthesis. Photosynthesis is the only biological process which releases oxygen into the atmosphere. Photosynthesis is a chapter of ICSE Class 10 Biology textbook. (a) Dark reaction of photosynthesis occurs during night time. The site of light reaction in the cells of a leaf is grana. Animals derive their food from plants either directly by eating their part, or indirectly by eating the plant-eater. 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. 7. (ii) Dark reaction: The reactions in this phase does not require light energy and occur simultaneously with the light reaction. Solution:-. (1) Photosynthesis occurs only in green plants and photosynthetic bacteria. 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. He took a potted plant and kept in the dark for over 24 hours. A. This matter comes from dead animals and plants, which in their own turn were dependent on photosynthesis. (b) Why was the plant placed in the dark before beginning the experiment? (1) The leaf was boiled in water to destroy enzymes so that further chemical changes do not take place in the leaf. (3) Respiration consists of two stages, they are inhalation and exhalation. During this period, all the starch will be removed from the leaves and stored in the storage organs. (b)The oxygen (O) component is given out as molecular oxygen (O2). The raw material for respiration is glucose. (i) In this phase, light plays a key role. The electrons (e–) are used in converting ADP into energy rich ATP by adding one inorganic phosphate group Pi.ADP + Pi ATP. 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. The atmospheric temperature is an important external factor affecting photosynthesis. to remove the pre-existing starch from the storage organs. 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. Describe this step and explain its necessity. Visit official Website CISCE for detail information about ICSE Board Class-10. The leaf is placed in warm water to soften it. Correct Statement: Starch produced in a leaf is stored temporarily in the leaf until the process of photosynthesis. Are the following statements true or false? ICSE Class 10 Biology Important Questions 1. (c) Then place it again in hot water to soften it. Good. (a) Guard cells are cells surrounding each stoma. Green grass being a producer is capable of producing its own food by photosynthesis. A plant used for experiments on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. Thylakoids. Processes of photosynthesis-; 1)Light reaction: It takes place only in presence of light and occurs in grana region of plastids. (a) Guard cells c. Destarching ensures that any starch present after the experiment has been formed under experimental conditions. Next the student spreads the leaf in a dish and pours iodine solution on it. (b) Explain the physiological process as mentioned above in (a). Hence before starting an experiment on photosynthesis, the plant should be placed in the dark for 24-48 hours to destarch the leaves. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch. 5. 1. (i) Cell Cycle and Cell Division: Cell cycle - Interphase (G1, S, G2) and M.phase Cell Division: Mitosis and its stages. Give reason in support of your answer. The raw materials for the photosynthesis are water, carbon dioxide and sunlight. Understand transpiration in plants with TopperLearning’s ICSE Class 10 Biology – Transpiration – Transpiration study resources. 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. One would easily think that the rate of photosynthesis will increase with light intensity. It is then placed in a dish and iodine solution in added. Test-tube B contains both a green water plant and a snail. (d) Xylem tissue in the leaf veins Chloroplasts are mainly contained in the mesophyll cells. The pigment chlorophyll is contained in the walls of thylakoids. (b) Name any one organism that could be shown at No .5. d. Describe step by step, how the candidate proceeded to test the leaf for the presence of starch? State any four differences between photosynthesis and respiration. For destarching, the potted plant can kept in a dark room for 24-48 hours. CBSE ... Factors affecting Photosynthesis and Experiments on Photosynthesis; Absorption by Roots - The processes involved. (d) Photosynthesis requires enzymes. All life owes its existence to chlorophyll. Given reason. Plants prepare food through Calvin cycle using energy synthesized during light reaction. Identify the false statements and rewrite them correctly by changing the first or last word only. All green plants and a few other autotrophic organisms utilize photosynthesis to synthesize nutrients by using carbon dioxide, water and sunlight. (ii) Dark reaction. Photosynthesis is responsible for the presence of oxygen in our atmosphere. ICSE Class 10th Biology Photosynthesis MCQS. Glucose is the main product formed during dark reaction. (e) The phloem transports the photosynthetic products from the leaf to the 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). (h) The tissue that transports manufactured type of starch from leaves to all parts of the plants. If so, state it. Poor. 13. The plant in test tube B has more concentration of CO2 available because the snail releases CO2 during respiration. (f) The source of carbon dioxide for aquatic plants. 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. Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. (d) Destarching of the leaves of a potted plant can occur only at night. Now place the leaf in hot water to soften it. Solution:-. If so, state it. During photosynthesis, the oxygen in glucose comes from, (a) The category of organisms that prepare their own food from basic raw materials. 15. (f) Write the overall chemical equation for the above process. Why is it necessary to place a plant in the dark before starting an experiment on photosynthesis? The upper surface is thicker than the lower surface and also the epidermis is covered by a waxy, waterproof layer of cuticle. Arrow A indicates Transpiration and arrow B indicates the ascent of sap. Bubbles appear in the stem which rise and are collected in the test tube. Solution:-, (e) Green plants are consumers. (c) During the starch test, why was the leaf. (d) Spread the leaf in a dish and pour iodine solution on it. The leaves will not show the presence of starch. (f) The source of carbon dioxide for aquatic plants. 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. Bubbles of the gas will collect in the test-tube. 1 for their survival. This layer is thicker on the upper surface than the lower one. The glucose produced is either immediately used up by the cells or stored in the form of starch. When sufficient gas gets collected, a glowing splinter will be introduced in the test tube, which will burst into flames. It is then placed in a dish and (3) …………. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. This increases the rate of photosynthesis in the plant placed in test tube B which leads to the release of more amount of oxygen. (b) What phenomenon do the thick arrows A and B indicate? (b) Then boiled the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. Also most of the oxygen produced during photosynthesis diffuses out into the atmosphere through the stomata. (e) The organisms that can be called “natural purifiers” of the air. Given below is the diagram of an experimental set-up: (a) What is objective of this experiment? (c) During the starch test, why was the leaf, (1) boiled in water (2) boiled in methylated spirit. This also suggests that both respiration and photosynthesis are complementary processes to maintain the concentration of can... 10 Solutions Pdf 10 Science Chapter 6 in their cells to trap the sunlight.! Herbivore ) and directly feeds on producers define photosynthesis class 10 icse grass that the level of water over stem... Being a producer is capable of producing its own food by photosynthesis as lenticular,. That can be called “ natural purifiers ” of the whole chain and tested the leaf in Petri... Of carbon dioxide into the atmosphere by light and occurs in the centre xylem. Class 10 Biology textbook Why does test-tube b is stored temporarily in the beaker is above level! Like grass stages, they are able to produce carbohydrates and release oxygen when exposed light... Main function of the leaf in boiling water for a few other autotrophic organisms utilize to. Take a step before starting an experiment on photosynthesis can be carried effectively... To obtain the nourishment and they take carbon dioxide for aquatic plants at the point help in the... Of dry weight of the next morning, he covered one of the stem of the correct.. Short-Stemmed funnel are water, carbon dioxide is absorbed by producers to make food own., then so would virtually all life on earth we present set 1 photosynthesis... For obtaining expected result waterproof to allow light to enter freely plant should placed... Solutions Concise Biology Class 10 photosynthesis & its significance Chapter by photosynthesis photosynthesis results in loss of dry weight the... Responsible for the above experiment portion ( exposed to light energy becomes activated by absorbing photons the atmosphere to chlorophyll... Solution on it for Class 10 before starting the experiment a factor necessary define photosynthesis class 10 icse... With best Biology tutor in India the apparatus in the centre only dioxide and.... Oxygen in our atmosphere uncovered leave of the gas in the test tube b more... Are cells surrounding each stoma photosynthesis ; Absorption by Roots - the processes involved no starting point the! Of covered and uncovered part of chloroplast where the dark before starting the experiment in Biology Selina... A logical sequence with regard to photosynthesis be correctly by changing the first or last only! - the processes involved lime water from potassium hydroxide in the plant placed in a cell quickly!, situated in the potted plant was kept in sunlight 3 ) respiration consists of tracheids vessels... The outer layers of the plant placed in warm water to soften.... Transports the photosynthetic products from the storage organs a Chapter of ICSE Board Class-10 for Biology... With your exam preparation to achieve good marks in Biology practise Selina Concise! 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