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. (a) Light is required for photosynthesis. 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. Average . It is contained in microscopic cell organelles called chloroplasts. Explain briefly the role of the following structures in this process. Invert a test tube full of water over the stem of the funnel. Correct Statement: Respiration results in loss of dry weight of the plants. 3. In this Goprep session of ICSE Class 10, our Goprep Biology expert Sona Sir will be discussing the Class 10 Biology chapter Photosynthesis. 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 . (a)  Fill up the gaps, in blank spaces (1-4), by writing the names of the correct items. to remove the pre-existing starch from the storage organs. 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. Bubbles of the gas will collect in the test-tube. A plant used for experiments on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. Describe this step and explain its necessity. How would you demonstrate that green plants release oxygen when exposed to light? (b) The kind of plastids found in the mesophyll cells of the leaf. 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 student dipped the leaf in boiling water for a minute to kill the cells. The leaves will not show the presence of starch. Identify the false statements and rewrite them correctly by changing the first or last word only. It takes place in the presence of light. (g) Photosynthesis stops at a temperature of about 35oC. Chloroplasts are the kind of plastids found in the mesophyll cells of the leaf. 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. (b) Cuticle He took a potted plant and kept in the dark for over 24 hours. (f) Stomata are minute opening occurring in large numbers on the lower surface of a leaf. 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. Practice biology sample question papers to score high in exams. (b) What phenomenon do the thick arrows A and B indicate? Why is it necessary to place a plant in the dark before starting an experiment on photosynthesis? The presence of starch will be indicated by a blue-black colour. The leaves will not show the presence of starch. Photosynthesis. (d) Write a balanced chemical equation to represent the process of photosynthesis. Also most of the oxygen produced during photosynthesis diffuses out into the atmosphere through the stomata. (ii) Structure of chromosome: Basic structure of chromosome with elementary understanding of terms such as chromatin, chromatid, gene structure of DNA and centromere. Give reason. 1. (Make sure the level of water in the beaker is above the level of the stem of the funnel). (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. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch. In the darkness, respiration alone is responsible for changes in the gaseous composition of the plant’s surrounding atmosphere. The leaves will not show the presence of starch. Your email address will not be published. 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. 5. Are the following statements true or false? c. Why was the plant kept in the dark before the experiment? Solution:-. A glowing splinter bursts into a flame which shows the presence of oxygen. So, there is no starting point or ending point in the carbon cycle. (a) Respiration and photosynthesis (gas released), (b) Light and dark reactions (products formed), (c) Producers and consumers (mode of nutrition), (d) Grass and grasshopper (mode of nutrition), (e) Chlorophyll and chloroplast (part of plant cell). The site of light reaction in the cells of a leaf is grana. So the various experiments on photosynthesis can be carried out effectively. (b) Name any one organism that could be shown at No .5. (b) Invert a test-tube full of water over the stem of the funnel. 6. It is a highly complex substance, composed of carbon, hydrogen, oxygen, nitrogen and magnesium chloroplasts are mainly contained in the mesophyll cells located between the upper epidermis and the lower epidermis of leaves. Yes. Solution:-. Plants prepare food through Calvin cycle using energy synthesized during light reaction. (Ensure that the level of water in the beaker is above the level of the stem of the inverted funnel). 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. (b) The kind of plastids found in the mesophyll cells of the leaf. It is then placed in a dish and (3) …………. 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? (a) The category of organisms that prepare their own food from basic raw materials. Answer the questions that follow: (a) Name the physiological process that releases the bubbles of oxygen. 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. (e) Give an example of a water plant that can be used in the above experiment. The leaf now becomes hard and brittle. It is contained in microscopic cell organelles called chloroplasts. (a) The site of light reaction in the cells of a leaf is ………… (cytoplasm, stroma, grana), (b) The chemical substance used to test the presence of starch in the cell of a leaf is …………. Oxygen supports all life on earth. Photosynthesis occurs in plants and some bacteria. 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. ... ICSE 10 Biology Revision Notes. Correct Statement: Dark reaction of photosynthesis is independent of light and occurs simultaneously with light reaction. (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. (b) Why was the plant placed in the dark before beginning the experiment? Oxygen is released as a by-product. (a) The student wanted to show that sunlight is necessary for photosynthesis. (CaCl2, iodine solution, Benedict solution), (c) Stroma is ground substance in ……………. 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. 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. Which one chemical reaction occurs during photosynthesis? (e) The starting point of carbon cycle is the release of carbon dioxide by animals during respiration. Therefore, they are called autotrophs (self-nutrition). (f) Write the overall chemical equation for the above process. Producers or Autotrophs are the organisms that prepare their own food from basic raw materials. Glucose is the main product formed during dark reaction. Solution:-. (a) Fill up the gaps, in blank spaces (1-4), by writing the names of the correct items. ICSE Solutions for Class 10 Biology – Photosynthesis ICSE SolutionsSelina ICSE Solutions APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 5 Photosynthesis for ICSE … (a) The rate of photosynthesis continues to rise as long as the intensity of light rises. The leaves will not show the presence of starch. They help to regulate the rate of transpiration by opening and closing the stomata. Describe this step and explain its necessity. (b) The outside atmospheric temperature has no effect on the rate of photosynthesis. (b) Before beginning the experiment, the plant was kept in dark in order to destarch it, i.e. These notes are totally based on latest Biology textbook of ICSE Board. (a) What aspect of photosynthesis was being tested? Extramarks, an e-learning website offers online tutorials for ICSE class 10 Experiments on Transpiration Chapter. (d) Write a balanced chemical equation to represent the process of photosynthesis. Stroma is the ground substance in the chloroplast. Fungi and bacteria break down the organic matter to obtain the nourishment and they release carbon dioxide back in the atmosphere. Question 15 : Complete the following statement by filling in the blanks with the appropriate word from the choices given in … Dip a leaf in boiling water for a minute to kill the cells. (e) The phloem transports the photosynthetic products from the leaf to the other parts of the plant. d. The gas released by green plants during photosynthesis. (a) Photosynthesis releases bubbles of oxygen. During this period, all the starch will be removed from the leaves and stored in the storage organs. Glucose is the first form of food substance produced during photosynthesis. (d) Why does test-tube B have more bubbles of oxygen? (2) Splitting of water – The absorbed energy is used in splitting the water molecule into hydrogen and oxygen, releasing energy. The blood vessels supplying blood to the kidney. (a) Respiration and photosynthesis (gas released) Give reason in support of your answer. (3) solution in added. (c) Stroma is ground substance in  chloroplast. The chloroplasts are concentrated in the upper layers of the leaf which helps cells to trap the sunlight quickly. A potted plant was taken in order to prove a factor necessary for photosynthesis. (b) The chemical substance used to test the presence of starch in the cell of a leaf is…………… (CaCl2, iodine solution, Benedict solution). The main aim of this experiment is to describe the importance of carbon dioxide in the photosynthesis. Hence before starting an experiment on photosynthesis, the plant should be placed in the dark for 24-48 hours to destarch the leaves. b. Why is it not possible to demonstrate respiration in a green plant kept in sunlight? Green plants (producers) use carbon dioxide of the air to produce carbohydrates and release oxygen to the atmosphere. (d) Destarching of the leaves of a potted plant can occur only at night. Respiration. A candidate studied the importance of certain factors in photosynthesis. They are present mainly in the mesophyll cells and in the guard cells of stomata. (b) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. (d) Name one natural element which all the organisms 2-4 and even 5 are getting from No. The presence of starch is indicated by a blue-black colour. One of the leaves was covered with black paper in the centre. Thus, we can say that all life owes its existence to chlorophyll. Chlorophyll is the green colouring matter found in plants. 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. (3) Respiration consists of two stages, they are inhalation and exhalation. The leaf becomes hard and brittle. Is there any control in this experiment? The electrons (e–) are used in converting ADP into energy rich ATP by adding one inorganic phosphate group Pi.ADP + Pi  ATP. The upper surface is thicker than the lower surface and also the epidermis is covered by a waxy, waterproof layer of cuticle. During this period, all the starch will be removed from the leaves and stored in the storage organs. The number of water molecules required in the chemical reactions to produce one molecule of glucose during photosynthesis is, 3. (g) Photosynthesis stops at a temperature of about 35oC. 15. The correct order in a logical sequence with regard to photosynthesis be. Chloroplasts are mainly contained in the mesophyll cells. (a) Guard cells: They regulate the opening and closing of stomata and thus regulate the entry of carbon dioxide through the stomata. A leaf without starch will show brown colouration. Reviewer. (c) Mesophyll cells Given below is the representation of a certain phenomenon in nature. Short Questions. Available here are Chapter 5 - Transpiration Exercises Questions with Solutions and detail explanation for your practice before the examination Oxygen is released during photosynthesis. Explain. 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 region, which contains starch, turns blue-black colour and the region, which does not contain starch, turns brown colour. To study the effect of sunlight on the rate of photosynthesis. The starting point of any food chain is always a plant. With four organisms 1-4. Solution:-, (c) Producers and consumers (mode of nutrition) If green plants were to suddenly disappear, then so would virtually all life on Earth. (i) In this phase, light plays a key role. (d) The xylem consists of tracheids and vessels, which transport water and minerals to the leaves. 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. Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis, is the most significant life process. Reviewed Item. (c) During the starch test, why was the leaf, (1) boiled in water                      (2) boiled in methylated spirit. and the region, which does not contain starch, turns (5) ………………. Complete the following food chains by writing the names of appropriate organisms in the blanks: 14. Solution:-. (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. The plant in test tube B has more concentration of CO2 available because the snail releases CO2 during respiration. Poor. Place hydrilla plant (a water plant) in a beaker containing pond water and cover it by a short-stemmed funnel. 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. Bubbles appear in the stem which rise and are collected in the 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. It is then placed in a dish and iodine solution in added. Excellent. Solution:-. (h) Photosynthesis occurs only in cells containing chloroplasts. So, oxygen is not a waste of photosynthesis because all organisms require it for their existence including the plants. Question 1. The leaf is placed in warm water to soften it. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. (a) Define photosynthesis. Photosynthesis is the biological process which was the starting point of the whole chain. (ii) Dark reaction: The reactions in this phase does not require light energy and occur simultaneously with the light reaction. (c) Mesophyll cells: Mesophyll cells are the main sites for photosynthesis. (f) Photosynthesis results in loss of dry weight of the plants. Chlorophyll is the green colouring matter found in plants. (c) The compound which stores energy in the cells. “Oxygen is a waste product of photosynthesis.” Comment. All the other three terms are concerned with processes in plants. 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. It is not possible to demonstrate respiration in green plants kept in sunlight because during day time plants are undergoing photosynthesis. 3. Solution:-. Excretory System ICSE Class-10 Concise Selina Biology Solutions for ICSE Class 10 Chapter-9. During photosynthesis, the oxygen in glucose comes from, (a) The category of organisms that prepare their own food from basic raw materials. Explain. 5. This process is called photophosphorylation. (iii) Photosynthesis. Solution:-. Enumerate the steps involved in testing a green leaf for the presence of starch. Given reason. 10. The leaf is placed in warm water to soften it. A series of chemical reactions occur in very quick succession, initiated by light and therefore, the phase is called the photochemical phase. Starch produced in the leaf remains stored in it until the night before it is used by other parts of the plant. This layer is thicker on the upper surface than the lower one. 1 for their survival. The leaf is placed in warm water to soften it. State any four differences between photosynthesis and respiration. The leaf now becomes hard and brittle. 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. In photosynthesis solar energy (sunlight) is converted to chemical energy and is stored in plants as starch. 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. The difference in the colours of covered and uncovered part of leaves indicates the importance of sunlight in photosynthesis. (b) Why was the plant placed in the dark before beginning the experiment? (c) What alteration (s) will you make in it for obtaining expected result? The chlorophyll on exposure to light energy becomes activated by absorbing photons. (d) Why does test-tube B have more bubbles of oxygen? Most leaves have the upper surface more green and shiny than the lower one. Producers show autotrophic mode of nutrition i.e. Answer the questions that follow: (a) Name the physiological process that releases the bubbles of oxygen. Respiration results in loss of dry weight of the plants. (f) Stomata: The main function of stoma is to let in carbon dioxide from the atmosphere for photosynthesis. 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. Which one chemical reaction occurs during photosynthesis? (c) What is the purpose of keeping a snail in test-tube B? CBSE ... Factors affecting Photosynthesis and Experiments on Photosynthesis; Absorption by Roots - The processes involved. The time gap between the light and dark reaction is less than one thousandth of a second. During this stage, light energy is converted into chemical energy. Solution:-. When sunlight falls on the leaf, the light energy is trapped by the chlorophyll of the upper layers of mesophyll, especially the palisade cells. Here, we present set 1 of Photosynthesis flashcard notes. (i) Cell Cycle and Cell Division: Cell cycle - Interphase (G1, S, G2) and M.phase Cell Division: Mitosis and its stages. (c) Name the biological process which was the starting point of the whole chain. 7. Glucose is produced which is utilized by the plants. The appearance of a blue-black colour on the leaf is indicative of the presence of starch. 2019-03-01. Our expert faculty will help you cover every bit of all ICSE Class 10 Biology chapters in upcoming sessions as well. To obtaining expected result replace the lime water from potassium hydroxide because it absorbs carbon dioxide. How would you demonstrate that green plants release oxygen when exposed to light? The leaf is placed in warm water to soften it. Plants also store excess sugar by synthesis of starch Heterotrophs, including humans, may completely or partially consume plants for fuel and raw materials. 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. Explain briefly the role of the following structures in this process. All life owes its existence to chlorophyll. One would easily think that the rate of photosynthesis will increase with light intensity. Arrow A indicates Transpiration and arrow B indicates the ascent of sap. Complete the following food chains by writing the names of appropriate organisms in the blanks: (ii) Grass/Corn → Mouse → Snake → Peacock. (1) The leaf is boiled in water for a minute to kill the cells. The other uncovered leave of the potted plant act as a control. Give reason. (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). Solution:-. 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 purpose of keeping a snail in test-tube ‘B’ is to increase the rate of photosynthesis by increasing the concentration of carbon dioxide. Photosynthesis prepared by Academic team of Entrancei . (1) Photosynthesis occurs only in green plants and photosynthetic bacteria. 7. Mention one difference between the following on the basis of what is given in brackets. What aspect of photosynthesis was being investigated? ICSE Class 10 Biology Important Questions 1. The grass is eaten up by the grasshopper. It is next boiled in methylated spirit to ……………(2). 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. Hence most leaves have the upper surface more green and shiny than the lower one. d. Describe step by step, how the candidate proceeded to test the leaf for the presence of starch? Extra Questions for Class 10 Science Chapter 6 Value Based Questions. (h) Photosynthesis occurs only in cells containing chloroplasts. Solution:-. How do non-green plants such as fungi and bacteria obtain their nourishment? The main function of the stomata is to let in CO2 from the atmosphere for photosynthesis. Solution:-, (d) Grass and grasshopper (mode of nutrition) 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. Identify the false statements and rewrite them correctly by changing the first or last word only. Significance and major differences between mitotic and meiotic division. (b) Explain the physiological process as mentioned above in (a). Select your board, class and subject to Get Started: Select board . Yes, in the potted plant uncovered portion of the leaf is used as a control. c. The fluid that transports fatty acids and glycerol. they are able to produce their own food from basic raw materials. It takes place in the thylakoid membranes of the chloroplast and includes photosynthetic pigments arranged into two light-harvesting complexes within photo system I … A. 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