Oxygen supports all life on earth. For destarching, the potted plant can kept in a dark room for 24-48 hours. (b) Explain the physiological process as mentioned above in (a). 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. If so, state it. During this stage, light energy is converted into chemical energy. (h) Photosynthesis occurs only in cells containing chloroplasts. All life owes its existence to chlorophyll. (c) What alteration(s) will you make in it for obtaining expected result? The gas released during photosynthesis is oxygen. The organism that could be shown at No.5 is Hawk. So, oxygen is not a waste of photosynthesis because all organisms require it for their existence including the plants. Photosynthesis | Importance of Photosynthesis | ICSE Class 10 Biology Chapter 6 | Selina Concise Solution | Umang 2020 | #Vedantu9thand10thEnglish with Then he boiled the leaf in alcohol / methylated spirit over a water bath to remove chlorophyll. (1) The leaf was boiled in water to destroy enzymes so that further chemical changes do not take place in the leaf. Respiration results in loss of dry weight of the plants. A single vascular bundle, no matter how large or small, always contains both xylem and phloem tissues. To register Biology Tuitions on Vedantu.com to clear your doubts. All other organisms, directly or indirectly depend on this food for their survival. So the various experiments on photosynthesis can be carried out effectively. The potted plant was then placed in sunlight for a few hours. Question 1. The difference in the colours of covered and uncovered part of leaves indicates the importance of sunlight in photosynthesis. The glucose produced is either immediately used up by the cells or stored in the form of starch. Solution:-, (e) Chlorophyll and chloroplast (part of plant cell), 2. (e) Give an example of a water plant that can be used in the above experiment. (d) The dark reaction of photosynthesis is known as…………… (Hill reaction, cyclic phosphorylation, Calvin cycle). (d) Would you take any step before starting the experiment? (c) Then place it again in hot water to soften it. 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. 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) ……………. Hence, it is difficult to demonstrate respiration as these two processes occur simultaneously. Reviewer. 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. To obtaining expected result replace the lime water from potassium hydroxide because it absorbs carbon dioxide. If so, state it. Bubbles of the gas will collect in the test-tube. Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. You can watch our video lessons to understand different types of transpiration such as lenticular transpiration, cuticular transpiration and stomatal transpiration. (2) Respiration is not dependent on light. (c) What is the purpose of keeping a snail in test-tube B? Animals derive their food from plants either directly by eating their part, or indirectly by eating the plant-eater. ... ICSE 10 Biology Revision Notes. It is then placed in a dish and …………. Chlorophyll is the green pigment present in cell organelles called chloroplasts. sucrose, which is transported in solution through the phloem in the veins of the leaf and down through the phloem of the stem. (h) The tissue that transports manufactured type of starch from leaves to all parts of the plants. (b) What phenomenon do the think arrows A and B indicate respectively? A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. Chlorophyll is the foundation site for the photosynthesis in green plants. Question 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. 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. The potted plant was kept in the dark for 24 hours. The plant in test tube B has more concentration of CO2 available because the snail releases CO2 during respiration. (e) The phloem transports the photosynthetic products from the leaf to the other parts of the plant. Good. (v) photons, (iii) grana, (i) water molecules, (iv) hydrogen and hydroxyl ions, (ii) oxygen. 6. Describe the main chemical changes which occur during photosynthesis in: How would you demonstrate that green plants release oxygen when exposed to light? How would you demonstrate that green plants release oxygen when exposed to light? Respiration. 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.. Green grass being a producer is capable of producing its own food by photosynthesis. (f) Stomata are minute opening occurring in large numbers on the lower surface of a leaf. Correct Statement: Dark reaction of photosynthesis is independent of light and occurs simultaneously with light reaction. The potted plant was then placed in sunlight for a few hours. (b) Why was the plant placed in the dark before beginning the experiment? (a) Guard cells: They regulate the opening and closing of stomata and thus regulate the entry of carbon dioxide through the stomata. (d) Before starting the experiment, it is necessary to destarch the leaves of the plant by keeping the plant in complete darkness for 48 hours. A potted plant was taken in order to prove a factor necessary for photosynthesis. It is next boiled in methylated spirit to (2) ……………. Fill in the blanks with the appropriate answer from the choices given in the brackets. b. 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. ICSE Class 10 Biology Important Questions 1. Here, we present set 1 of Photosynthesis flashcard notes. In photosynthesis solar energy (sunlight) is converted to chemical energy and is stored in plants as starch. Photosynthesis is a chapter of ICSE Class 10 Biology textbook. (a) The rate of photosynthesis continues to rise as long as the intensity of light rises. Practice biology sample question papers to score high in exams. (i) Cell Cycle and Cell Division: Cell cycle - Interphase (G1, S, G2) and M.phase Cell Division: Mitosis and its stages. c. Destarching ensures that any starch present after the experiment has been formed under experimental conditions. It is not possible to demonstrate respiration in green plants kept in sunlight because during day time plants are undergoing photosynthesis. The electrons (e–) are used in converting ADP into energy rich ATP by adding one inorganic phosphate group Pi.ADP + Pi ATP. State any four differences between photosynthesis and respiration. The blood vessels supplying blood to the kidney. Solution:-. Reviewed Item. (iii) Photosynthesis. Are the following statements true or false? How do non-green plants such as fungi and bacteria obtain their nourishment? Photosynthesis definition states that the process exclusively takes place in the chloroplasts through photosynthetic pigments such as chlorophyll a, chlorophyll b, carotene and xanthophyll. 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. The leaves will not show the presence of starch. (3) Respiration consists of two stages, they are inhalation and exhalation. Available here are Chapter 5 - Transpiration Exercises Questions with Solutions and detail explanation for your practice before the examination 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 correct order in a logical sequence with regard to photosynthesis be. Solution:-. b. What aspect of photosynthesis was being investigated? Hence before starting an experiment on photosynthesis, the plant should be placed in the dark for 24-48 hours to destarch the leaves. A candidate studied the importance of certain factors in photosynthesis. It takes place in the presence of light. This process is called photophosphorylation. The uncovered portion (exposed to sunlight) turned blue-black colour and the covered portion showed brown colour. A potted plant was taken in order to prove a factor necessary for photosynthesis. 6. Solution:-. During this period, all the starch will be removed from the leaves and stored in the storage organs. Our expert faculty will help you cover every bit of all ICSE Class 10 Biology chapters in upcoming sessions as well. Now place the leaf in hot water to soften it. (b) The outside atmospheric temperature has no effect on the rate of photosynthesis. (a) Light is required for photosynthesis. (f) Chemical equation for photosynthesis: Return to Concise Selina ICSE Biology Class-10, Heat and Energy Concise Class-9 ICSE Physics Selina Publishers, Excretory System ICSE Class-10 Concise Selina Biology Solutions, ICSE History and Civics 2020 Paper Solved Class-10 Previous Year…, Work and Energy HC Verma Que for Short Ans Solutions Ch-8 Vol-1, HC Verma Solutions Vol-2 Concept of Physics Bharti Bhawan Publishers, ICSE English-2 Literature 2020 Paper Solved Class-10 Previous Year…, Heat and Temperature Obj-2 HC Verma Solutions Vol-2 Chapter-23, ICSE Commercial Studies 2020 Solved Paper Previous Year Question, Privancy Policy | Sitemap | About US | Contact US, Photosynthesis ICSE Class-10 Concise Selina Biology. (b) Invert a test-tube full of water over the stem of the funnel. Hydrogen and oxygen are produced here, along with release of electrons, which converts ADP into ATP. (i) Light reaction One of the leaves was covered with black paper in the centre. In the darkness, respiration alone is responsible for changes in the gaseous composition of the plant’s surrounding atmosphere. It prepare its own food by photosynthesis. 8. ICSE Class 10th Biology Photosynthesis MCQS. Why? Bubbles appear in the stem which rise and are collected in the test tube. Carbon dioxide is absorbed by producers to make glucose in photosynthesis. Why is it necessary to place a plant in the dark before starting an experiment on photosynthesis? (b)The oxygen (O) component is given out as molecular oxygen (O2). The initiation of photosynthesis takes place when the chlorophyll molecule traps the light energy. (b) No, the experiment will not work satisfactorily, as the beaker contains lime water and not potassium hydroxide to absorb CO2. Our specialist teachers have answered these exercises to help you with your exam preparation to achieve good marks in the subject. Glucose is the main product formed during dark reaction. (ii) Dark reaction. The leaf is placed in warm water to soften it. 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. (e) Phloem tissue in Leaf Veins The essential chemical steps in this process are the same in all green plants. 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. Extramarks, an e-learning website offers online tutorials for ICSE class 10 Photosynthesis & its Significance Chapter. Photosynthesis occurs in plants and some bacteria. 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. During this period, all the starch will be removed from the leaves and stored in the storage organs. The glucose is converted into insoluble starch and later into soluble sugar i.e. Solution:-. (b) Immediate product of photosynthesis is glucose. Most leaves have the upper surface more green and shiny than the lower one. (ii) Dark reaction: The reactions in this phase does not require light energy and occur simultaneously with the light reaction. (b) Name any one organism that could be shown at No.5. 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. Oxygen is released during photosynthesis. Chloroplasts are cell organelles, situated in the cytoplasm of plant cells. Extramarks, an e-learning website offers online tutorials for ICSE class 10 Experiments on Transpiration Chapter. 3. (f) The source of carbon dioxide for aquatic plants. A glowing splinter bursts into a flame which shows the presence of oxygen. (e) In the flowering plants, food is transported in the form of……………………… (sucrose, glucose, starch). (a) Photosynthesis releases bubbles of oxygen. Do solve all questions of ICSE Chemistry with the help of Entrancei ICSE Class 10 … Place the set up in the sun light for a few hours. Both test-tubes are kept in sunlight. Chloroplasts are mainly contained in the mesophyll cells. Enumerate the steps involved in testing a green leaf for the presence of starch. (c) Place the apparatus in the sun for a few hours. 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. To study the effect of sunlight on the rate of photosynthesis. 2)Dark reaction - It is independent of light and occurs in stroma region of plastids. 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. b. 5. 6. No living being can remain alive without oxygen. 2019-03-01. 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. The leaf is placed in warm water to soften it. Students who wish to score good marks in Biology practise Selina Solutions Concise Biology Class 10. Step 1:- Activation of chlorophyll. 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? 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. Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. (g) Photosynthesis is considered as a process supporting all life on earth. (e) The organisms that can be called “natural purifiers” of the air. He then places the leaf in hot water to soften it. Photosynthesis occurs in plants and some bacteria. (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. 4. (a) The category of organisms that prepare their own food from basic raw materials. b. It is contained in microscopic cell organelles called chloroplasts. (2) Photosynthesis is dependent on light. The site of light reaction in the cells of a leaf is grana. (b) Cuticle is transparent and waterproof to allow light to enter freely. Which one chemical reaction occurs during photosynthesis? Complete the following food chains by writing the names of appropriate organisms in the blanks: 14. Grasshopper is a primary consumer (herbivore) and directly feeds on producers like grass. 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, 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. (2) The leaf was boiled in methylated spirit to dissolve chlorophyll. (1) Photosynthesis occurs only in green plants and photosynthetic bacteria. Explain briefly the role of the following structures in this process. 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-6 Photosynthesis ICSE Class-10 Concise . (f) Write the overall chemical equation for the above process. 4. Photosynthesis ICSE Class-10 Concise Selina Biology Solutions Chapter-6. 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 leaves will not show the presence of starch. 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. (e) The organisms that can be called “natural purifiers” of the air. Identify the false statements and rewrite them correctly by changing the first or last word only. (CaCl2, iodine solution, Benedict solution), (c) Stroma is ground substance in ……………. (d) Test the gas in the test-tube. There is no start point or end point in the carbon cycle, the carbon is constantly circulated between the atmosphere and the living organisms. 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. a. Fixation and reduction of carbon dioxide occurs in the stroma of the chloroplast through a series of reactions. A basic understanding of Meiosis as a reduction division (stages not required). 16. Plants also store excess sugar by synthesis of starch Heterotrophs, including humans, may completely or partially consume plants for fuel and raw materials. 3. (b) The chemical substance used to test the presence of starch in the cell of a leaf is…………… (CaCl2, iodine solution, Benedict solution). (b) Immediate product of photosynthesis is glucose. Photosynthesis: This module focuses on mechanism of photosynthesis. (f) Stomata: The main function of stoma is to let in carbon dioxide from the atmosphere for photosynthesis. (a) Dip the leaf in boiling water for a minute to kill the cells. The upper surface is thicker than the lower surface and also the epidermis is covered by a waxy, waterproof layer of cuticle. It is contained in microscopic cell organelles called chloroplasts. It is then placed in a dish and (3) …………. 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. A. 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. Solution:-. c. Why was the plant kept in the dark before the experiment? 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 (d) Would you take any step before starting the experiment? Answer : Photolysis in photosynthesis is the splitting of water molecules into hydrogen ions and hydroxyl ions in the presence of chlorophyll and light. Yes, in the potted plant uncovered portion of the leaf is used as a control. Photosynthesis is responsible for the presence of oxygen in our atmosphere. Stroma is the ground substance in the chloroplast. Photosynthesis requires CO2 as the substrate in green plants. (c) Name the biological process which was the starting point of the whole chain. The water is then distributed in the mesophyll tissue. Both test-tubes are kept in sunlight. (b) The kind of plastids found in the mesophyll cells of the leaf. State any four differences between photosynthesis and respiration. Select your board, class and subject to Get Started: Select board . All life owes its existence to chlorophyll. Solution:-, (c) Producers and consumers (mode of nutrition) This reaction is known as photolysis of water. (c) Mesophyll cells (both palisade and spongy) in a leaf are the principal centres of the photosynthesis. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Place hydrilla plant (a water plant) in a beaker containing pond water and cover it by a short-stemmed funnel. (3) Photosynthesis consists of two stages light reaction and dark reaction. One would easily think that the rate of photosynthesis will increase with light intensity. The leaf is placed in warm water to soften it. Poor. Chlorophyll is the green colouring matter found in plants. Respiration occurs in all living organisms. Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment. Give reason. What aspect of photosynthesis was being investigated? Invert a test tube full of water over the stem of the funnel. (f) Stomata. 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. Solution:-. Give reason in support of your answer.