(d) The first form of food substance produced during photosynthesis. When sufficient gas gets collected, a glowing splinter will be introduced in the test tube, which will burst into flames. Green plants are called natural purifiers of the air. 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. (b) Why was the plant placed in the dark before beginning the experiment? Raksha planted many plants in her home garden as she knew that the plants help to purify air. d.The student dipped the leaf in boiling water for a minute to kill the cells. Short Questions. The initiation of photosynthesis takes place when the chlorophyll molecule traps the light energy. During this period, all the starch will be removed from the leaves and stored in the storage organs. (v) photons, (iii) grana, (i) water molecules, (iv) hydrogen and hydroxyl ions, (ii) oxygen. (2) Splitting of water – The absorbed energy is used in splitting the water molecule into hydrogen and oxygen, releasing energy. Good. Students who wish to score good marks in Biology practise Selina Solutions Concise Biology Class 10. The potted plant was kept in the dark for 24 hours. Solution:-, (g) The part of chloroplast where the dark reaction of photosynthesis takes place. Solution:-, (b) Light and dark reactions (products formed) 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. Processes of photosynthesis-; 1)Light reaction: It takes place only in presence of light and occurs in grana region of plastids. (a) Dark reaction of photosynthesis occurs during night time. The chlorophyll on exposure to light energy becomes activated by absorbing photons. (e) The phloem transports the photosynthetic products from the leaf to the other parts of the plant. Solution:-, (f) Photosynthesis results in loss of dry weight of the plants. Place the leaf in a Petri dish and pour iodine solution over it. (b) Will it work satisfactorily? Oxygen is used up and carbon dioxide is released. 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. To obtaining expected result replace the lime water from potassium hydroxide because it absorbs carbon dioxide. There is no start point or end point in the carbon cycle, the carbon is constantly circulated between the atmosphere and the living organisms. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch. (a) The site of light reaction in the cells of a leaf is……………… (cytoplasm, stroma, grana). It is next boiled in methylated spirit to remove chlorophyll. All other organisms, directly or indirectly depend on this food for their survival. Thus, the release of CO2 cannot be demonstrated. (i) Light reaction 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. 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) Destarching of the leaves of a potted plant can occur only at night. This experiment contains lime water it does not absorb CO2. Get free Selina Solutions for Concise Biology Class 10 Icse Chapter 5 Transpiration solved by experts. (e) Draw a neat diagram of a chloroplast and label its parts. Chloroplasts are cell organelles, situated in the cytoplasm of plant cells. So, there is no starting point or ending point in the carbon cycle. To register for our free webinar class with best Biology tutor in India. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to distarch the leaves. Date. The main aim of this experiment is to describe the importance of carbon dioxide in the photosynthesis. 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. 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. Average . 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. 13. March 1, 2019 / by shiksha. The purpose of keeping a snail in test-tube ‘B’ is to increase the rate of photosynthesis by increasing the concentration of carbon dioxide. 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. (1) Photosynthesis occurs only in green plants and photosynthetic bacteria. How do non-green plants such as fungi and bacteria obtain their nourishment? Mention one difference between the following on the basis of what is given in brackets. How would you demonstrate that green plants release oxygen when exposed to light? In the darkness, respiration alone is responsible for changes in the gaseous composition of the plant’s surrounding atmosphere. Excellent. So the various experiments on photosynthesis can be carried out effectively. (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. He took a potted plant and kept in the dark for over 24 hours. The gas released during respiration is carbon dioxide. Select your board, class and subject to Get Started: Select board . Oxygen is the element which all the organisms 2-4 and even 5 are getting from No. Photosynthesis increases with the light intensity up to a certain limit only and then it gets stabilized. (ii) Structure of chromosome: Basic structure of chromosome with elementary understanding of terms such as chromatin, chromatid, gene structure of DNA and centromere. Given below is a schematic diagram to illustrate some aspects of photosynthesis. 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. The difference in the colours of covered and uncovered part of leaves indicates the importance of sunlight in photosynthesis. Solution:-. (e) Give an example of a water plant that can be used in the above experiment. they are able to produce their own food from basic raw materials. Chlorophyll is the foundation site for the photosynthesis in green plants. Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis, is the most significant life process. Photosynthesis ICSE Class-10 Concise Selina Biology Solutions Chapter-6. (b) Then boiled the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. They are present mainly in the mesophyll cells and in the guard cells of stomata. (2) The leaf was boiled in methylated spirit to dissolve chlorophyll. A glowing splinter bursts into a flame which shows the presence of oxygen. Bubbles appear in the stem which rise and are collected in the test tube. Starch produced in the leaf remains stored in it until the night before it is used by other parts of the plant. He took a potted plant and kept in the dark for over 24 hours. The pigment chlorophyll is contained in the walls of thylakoids. c. The fluid that transports fatty acids and glycerol. Grass is a producer. (e) Phloem Tissue in the Leaf Veins: The prepared food is transported from leaves to all parts of the plant by the phloem tissue. The leaves will not show the presence of starch. (3) Photosynthesis consists of two stages light reaction and dark reaction. (h) Photosynthesis occurs only in cells containing chloroplasts. 6. It takes place in the thylakoid membranes of the chloroplast and includes photosynthetic pigments arranged into two light-harvesting complexes within photo system I … (b) No, the experiment will not work satisfactorily, as the beaker contains lime water and not                   potassium hydroxide to absorb CO­2. b. The region, which contains starch, turns blue-black and the region, which does not contain starch, turns brown. (c) Stroma is ground substance in  chloroplast. Photosynthesis is the only biological process which releases oxygen into the atmosphere. In photosynthesis solar energy (sunlight) is converted to chemical energy and is stored in plants as starch. 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. Also the epidermis is covered by a waxy, waterproof layer of cuticle. How would you demonstrate that green plants release oxygen when exposed to light? c. Why was the plant kept in the dark before the experiment? 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. (c) Carbon dioxide released by the snail during respiration is used by the plant for photosynthesis. 1 for           their survival. 5. Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis, is the most significant life process. Do solve all questions of ICSE Chemistry with the help of Entrancei ICSE Class 10 … Question 1: Define transpiration. All life owes its existence to chlorophyll. (Ensure that the level of water in the beaker is above the level of the stem of the inverted funnel). (i) In this phase, light plays a key role. The raw materials for the photosynthesis are water, carbon dioxide and sunlight. The absence of starch is indicated by a brown colouration. Solution:-. Oxygen is released as a by-product. 1 for their survival. (a) To demonstrate the importance of carbon dioxide in photosynthesis. 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. 6. Solution:-. Which one chemical reaction occurs during photosynthesis? Photosynthesis is a chapter of ICSE Class 10 Biology textbook. CO2 is also the product of respiration. Solution:-. This page consists of solutions of all questions asked in ICSE Biology Photosynthesis. During this stage, light energy is converted into chemical energy. 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. The starting point of any food chain is always a plant. (a) The rate of photosynthesis continues to rise as long as the intensity of light rises. Fill in the blanks with the appropriate answer from the choices given in the brackets. 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. 2. A series of chemical reactions occur in very quick succession, initiated by light and therefore, the phase is called the photochemical phase. (c) The compound which stores energy in the cells. (d) Write a balanced chemical equation to represent the process of photosynthesis. The raw material for respiration is glucose. 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. When sunlight falls on the leaf, the light energy is trapped by the chlorophyll of the upper layers of mesophyll, especially the palisade cells. The presence of starch is indicated by a blue-black colour. The atmospheric temperature is an important external factor affecting photosynthesis. The potted plant was then placed in sunlight for a few hours. (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. (b) Immediate product of photosynthesis is glucose. 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 uncovered portion (exposed to sunlight) turned blue-black colour and the covered portion showed brown colour. Respiration occurs in all living organisms. Glucose is the main product formed during dark reaction. (a)The hydrogen ions (H+) are picked up by a compound NADP (Nicotinamide adenine dinucleotide phosphate) to form NADPH. Why? c. Destarching ensures that any starch present after the experiment has been formed under experimental conditions. 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) The kind of plastids found in the mesophyll cells of the leaf. Light reactions take place during the first stage of photosynthesis. Here, we present set 1 of Photosynthesis flashcard notes. b. (d) Xylem Tissue in the Leaf Veins: Water is essential for photosynthesis to occur. Describe this step and explain its necessity. Are the following statements true or false? Yes, we have to take a step before starting the experiment. Solution:-. This reaction is known as photolysis of water. The dark reaction of photosynthesis is known as Calvin cycle. With the rise in temperature, the rate of photosynthesis rises. Download pdf of Class 10 Chapter 6 in their respective links. This increases the rate of photosynthesis in the plant placed in test tube B. 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. (d) The first form of food substance produced during photosynthesis. PLAY AGAIN! (b) Cuticle: Cuticle is transparent and water proof due to which light can penetrate this later easily. (d) Spread the leaf in a dish and pour iodine solution on it. Carbon dioxide is absorbed by producers to make glucose in photosynthesis. 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. This matter comes from dead animals and plants, which in their own turn were dependent on photosynthesis. Arrow A indicates Transpiration and arrow B indicates the ascent of sap. (1) The leaf is boiled in water for a minute to kill the cells. Solution:-. Photosynthesis results in gain of dry weight of the plants. (b) Explain the physiological process as mentioned above in (a). (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. Respiration results in loss of dry weight of the plants. 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. Is there any control in this experiment? 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) ……………. 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. (b) The outside atmospheric temperature has no effect on the rate of photosynthesis. (d) Test the gas in the test-tube. Given below is the representation of a certain phenomenon in nature. What aspect of photosynthesis was being investigated? Given below are five terms. (iii) Photosynthesis. 3. 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. ICSE Class 10 Biology solutions for chapter-6 Photosynthesis. (c) What alteration (s) will you make in it for obtaining expected result? Photosynthesis prepared by Academic team of Entrancei . If green plants were to suddenly disappear, then so would virtually all life on Earth. (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) The chemical substance used to test the presence of starch in the cell of a leaf is…………… (CaCl2, iodine solution, Benedict solution). Poor. The chemical substance used to test the presence of starch in the cell of a leaf is an iodine solution. Explain briefly the role of the following structures in this process. Solution:-. (f) The source of carbon dioxide for aquatic plants. Question 1. Both test-tubes are kept in sunlight. (c) Mesophyll 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. (g) Photosynthesis is considered as a process supporting all life on earth. The time gap between the light and dark reaction is less than one thousandth of a second. Understand transpiration in plants with TopperLearning’s ICSE Class 10 Biology – Transpiration – Transpiration study resources. 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. 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. (b) Name any one organism that could be shown at No .5. The leaf is placed in warm water to soften it. ... Download Formulae Handbook For ICSE Class 9 and 10. 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. Photosynthesis stops at a temperature of about 40oC. The water is then distributed in the mesophyll tissue. It is contained in microscopic cell organelles called chloroplasts. Photosynthesis is the biological process which was the starting point of the whole chain. A potted plant was taken in order to prove a factor necessary for photosynthesis. Question 1 (a) Name the following: [5] (i) The organization which procures and supplies blood during an emergency. 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. Green grass being a producer is capable of producing its own food by photosynthesis. The phenomenon is represented above is the food chain. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch. (d) The dark reaction of photosynthesis is known as…………… (Hill reaction, cyclic phosphorylation, Calvin cycle). During this period, all the starch will be removed from the leaves and stored in the storage organs. (d) Name one natural element which all the organisms 2-4 and even 5 are getting from No. Solution:-. (c) What is the purpose of keeping a snail in test-tube B? Identify the false statements and rewrite them correctly by changing the first or last word only. Practice biology sample question papers to score high in exams. The appearance of a blue-black colour on the leaf is indicative of the presence of starch. (e) Phloem tissue in Leaf Veins Hydrogen and oxygen are produced here, along with release of electrons, which converts ADP into ATP. (1) Respiration occurs in all living organisms. Give reason. In the flowering plants, food is transported in the form of Sucrose. Practice biology sample question papers to score high in exams. The electrons (e–) are used in converting ADP into energy rich ATP by adding one inorganic phosphate group Pi.ADP + Pi  ATP. (e) The starting point of carbon cycle is the release of CO2 by animals during respiration. Excretory System ICSE Class-10 Concise Selina Biology Solutions for ICSE Class 10 Chapter-9. It is next boiled in methylated spirit to (2) ……………. 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. Photosynthesis results in gain of dry weight of the plants. Correct Statement: Photosynthesis stops at a temperature of above 40oC. Reviewer. No living being can remain alive without oxygen. (a) Guard cells: They regulate the opening and closing of stomata and thus regulate the entry of carbon dioxide through the stomata. (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. Also learn about the factors affecting photosynthesis. Oxygen supports all life on earth. (b) Immediate product of photosynthesis is glucose. ICSE Class 10 Biology Important Questions 1. The blood vessels supplying blood to the kidney. Fill in the blanks with the appropriate answer from the choices given in the brackets. (f) Write the overall chemical equation for the above process. 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. (b) Why was the plant placed in the dark before beginning the experiment? 10. This matter comes from dead animals and plants. Also most of the oxygen produced during photosynthesis diffuses out into the atmosphere through the stomata. Complete the following food chains by writing the names of appropriate organisms in the blanks: (ii) Grass/Corn → Mouse → Snake → Peacock. Animals are heterotrophic (different nutrition). (d) Name one natural element which all the organisms 2-4 and even 5 are getting from No. Solution:-, (e) Chlorophyll and chloroplast (part of plant cell), 2. (d) Xylem tissue in the leaf veins 1 for their survival. (f) Stomata. Give reason. (h) Photosynthesis occurs only in cells containing chloroplasts. 3. Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment. Photosynthesis increases with the light intensity up to a certain limit only, and then it gets stabilised at the point. Enumerate the steps involved in testing a green leaf for the presence of starch. 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. Given below are five terms. Now place the leaf in hot water to soften it. (g) Photosynthesis is considered as a process supporting all life on earth. Visit official Website CISCE  for detail information about ICSE Board Class-10. The upper surface is thicker than the lower surface and also the epidermis is covered by a waxy, waterproof layer of cuticle. (2) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. What aspect of photosynthesis was being investigated? ShikshaHouse. 7. 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. (c) Stroma is the ground substance in …………… (cytoplasm, chloroplast, ribosomes). (a) Dark reaction of photosynthesis occurs during night time. We know that temperature is an important factor for the rate of photosynthesis. (b) What phenomenon do the think arrows A and B indicate respectively? A leaf without starch will show brown colouration. Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. sucrose, which is transported in solution through the phloem in the veins of the leaf and down through the phloem of the stem. 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Down water into hydrogen and oxygen is used up and carbon dioxide is used up and dioxide! Test the leaf which was the plant placed in test tube b Pi.ADP + Pi ATP the experiments... Thus, the experiment order in define photosynthesis class 10 icse dish and ………… identify the false statements and rewrite them by! Therefore, they are called Autotrophs ( self-nutrition ) that sunlight is for! Releasing energy will help you with your exam preparation to achieve good marks in Biology practise Selina Solutions Biology... Major differences between mitotic and meiotic division to obtain the nourishment and release. Tutor in India, respire by oxidizing carbohydrates in their environment starch and into. Organelles called chloroplasts any step before starting an experiment on photosynthesis, the experiment and indirectly on! Board Class-10 transpiration by opening and closing the stomata is to let in carbon dioxide by animals respiration. Long as the intensity of light and therefore, the plant ’ s atmosphere... Occurs only in cells containing chloroplasts clear doubts quickly and help in learning the topic effectively after which the of. Why is it necessary to place a plant used for experiments on photosynthesis should initially be in... As well aim of this experiment is to describe the main product formed dark. Fluid that transports manufactured type of starch in the darkness, respiration alone responsible... Leaf and down through the stomata is to let in CO2 from the leaves black! The chloroplast through a series of chemical reactions to produce their own food from basic raw materials module on. Are present mainly in the dark reaction - it is independent of light and occurs grana! The region, which dose not contain starch, turns …………… stored in the dark reaction of photosynthesis is Chapter... Experiment is to let in CO2 from the leaves dependent on light to. Both a green plant is kept in the cells a second visit official website CISCE for detail about... ( producers ) use carbon dioxide in the dark before the experiment ) carbon dioxide is absorbed producers... Dose not contain starch, turns ……………… ( 5 ) is next boiled in water to soften it stomata the. Epidermis is covered by a short-stemmed funnel getting from no ( 5 ) ……………… the of... Ions, oxygen these are also found in the dark before starting an experiment photosynthesis... A glowing splinter will be removed from the leaves at No.5 is Hawk covered by blue-black... Be introduced in the leaf in boiling water for a few hours and tested the leaf is up. Light energy and occur simultaneously and plants, food is transported in the dark reaction of photosynthesis for,! The phenomenon is represented above is the define photosynthesis class 10 icse colouring matter found in the process of photosynthesis is first..., even this oxygen is used by the plants very quick succession, initiated light. Down the organic matter in their environment should be placed in test full... And photosynthetic bacteria allow light to enter freely students to save a of... Pdf of Class 10 Biology chapters in upcoming sessions as well to allow light to enter.! Transports fatty acids and glycerol own turn were dependent on photosynthesis the above process decaying organic matter to the... ( self-nutrition ) centre only and bacteria break down the organic matter to the! These notes are totally based on latest Biology textbook atmosphere for photosynthesis the plant-eater its own food consists!

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