Chlorophyll is the green pigment present in cell organelles called chloroplasts. Photosynthesis stops at a temperature of about 40oC. 3. (2) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. Place the leaf in a Petri dish and pour iodine solution over it. Photosynthesis. Solution C.9. MULTIPLE CHOICE TYPE Photosynthesis ICSE Class-10 Concise Selina Biology Question 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 Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment. Answer : Hormones are the secretions from specific cells or glands in the body which are poured into the blood and have their effect on target cells or specific organs or tissues of the body. The presence of starch will be indicated by a blue-black colour. Maximum students of CISCE Class 10 prefer Frank Textbook Solutions to score more in exam. Which four of the following are needed for photosyn-thesis in a leaf: (i) Carbon dioxide: (ii) Oxygen: … All plants and animals, respire by oxidizing carbohydrates in their cells to produce energy and give out carbon dioxide into the atmosphere. The upper surface is thicker than the lower surface and also the epidermis is covered by a waxy, waterproof layer of cuticle. The leaves will not show the presence of starch. Chlorophyll is a green pigment found in the chloroplasts of the plant cell … 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. (b) The outside atmospheric temperature has no effect on the rate of photosynthesis. 6. Green grass being a producer is capable of producing its own food by photosynthesis. The rate of photosynthesis increases up to the temperature 35oC after which the rate falls and the photosynthesis stops after 40oC. Yes, we have to take a step before starting the experiment. Animals are heterotrophic (different nutrition). Therefore, they are called autotrophs (self-nutrition). In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Structure Of Chlorophyll. d. Carbon. (i) Grass → Rabbit. Next the student spreads the leaf in a dish and pours iodine solution on it. Photosynthesis - Get Get topics notes, Online test, Video lectures & Doubts and Solutions for ICSE Class 7 Biology on TopperLearning. 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. Dark reaction of photosynthesis occurs simultaneously with light reaction. Given below is the diagram of an experimental set-up: (a) What is objective of this experiment? Practice biology sample question papers to score high in exams. ICSE Class 10 Previous Year Board, Sample, Chapter-wise and Prelim Question Papers for Maths, English, Science (Physics, Chemistry and Biology), Social Science (History, Civics and Geography), Hindi, Computer Science (Applications), French, Cookery, Yoga, Commercial Applications, Environmental Science, Technical Drawing, Gujarati and Commercial studies Solution:-. Correct Statement: Photosynthesis stops at a temperature of above 40oC. To test the leaf for starch, the leaf is boiled in water to kill the cells. Selina Class 10 Biology Solutions cover all the essential topics and provide explanatory diagrams, according to the question. Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment. Destarching means removal of starch. Genetics. (1) The leaf is boiled in water for a minute to kill the cells. Practice Test 1. 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. Hence before starting an experiment on photosynthesis, the plant should be placed in the dark for 24-48 hours to destarch the leaves. 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 physiological process being studied is Photosynthesisii. Destarching ensures that any starch present after the experiment has been formed under experimental conditions. No living being can remain alive without oxygen. (i) In this phase, light plays a key role. 9. Inference: (e) False (e) Phloem tissue in Leaf Veins (ii) Grass/Corn → Mouse → Snake → Peacock. The chemical substance used to test the presence of starch in the cell of a leaf is an iodine solution. The presence of starch is regarded as evidence of photosynthesis. (f) False (Make sure the level of water in the beaker is above the level of the stem of the funnel). Nervous System. Respiration results in loss of dry weight of the plants. Animals derive their food from plants either directly by eating their part, or indirectly by eating the plant-eater. These MCQ's are extremely critical for all ICSE students to score better marks. Get the free view of chapter 6 Photosynthesis Class 10 extra questions for Concise Biology Class 10 Icse and can use Shaalaa.com to keep it handy for your exam preparation When sunlight falls on the leaf, the light energy is trapped by the chlorophyll of the upper layers of mesophyll, especially the palisade cells. c. Destarching ensures that any starch present after the experiment has been formed under experimental conditions. (a) Dip the leaf in boiling water for a minute to kill the cells. It takes place in the presence of light. (d) The first form of food substance produced during photosynthesis. (3) Respiration consists of two stages, they are inhalation and exhalation. You can download the Selina Concise Biology ICSE Solutions for Class 10 with Free PDF download option. To test the leaf for starch, the leaf is boiled in water to kill the cells. To demonstrate the importance of carbon dioxide in photosynthesis (b) Chloroplasts (g) Photosynthesis is considered as a process supporting all life on earth. The diagram below shows two test-tubes A and B. Test-tube A contains a green water plant. (c) Stroma is the ground substance in …………… (cytoplasm, chloroplast, ribosomes). Describe this step and explain its necessity. The dark reaction of photosynthesis is known as Calvin cycle. Yes. 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. If green plants were to suddenly disappear, then so would virtually all life on Earth. (b) The kind of plastids found in the mesophyll cells of the leaf. b. Hawk, eagle (e) The phloem transports the photosynthetic products from the leaf to the other parts of the plant. 1 Mark Questions Answer : Photophosphorylation is the process of conversion of ADP into ATP during photosynthesis. Answer: (i) A large surface area to absorb water. Maximum students of CISCE Class 10 prefer Selina Textbook Solutions to score more in exam. 16. The region, which contains starch, turns (4) ……………. iii. b) glucose formed in photosynthesis soon gets converted into starch, Solution A.5. 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. a. Name the following: 2. A perfect student guide for Biology that incorporates Notes, MCQ, FIll in the blanks, short Q&As, and other relevant objective type questions for all chapters in the Biology textbook as per the latest Class 10 ICSE Board Exam syllabus with solutions.. (c) What alteration(s) will you make in it for obtaining expected result? 1800-102-5301 Place the set up in the sun light for a few hours. General Instructions: Answers to this Paper must be written on the paper provided separately. (d) Name one natural element which all the organisms 2-4 and even 5 are getting from No. a) Carbon dioxide is reduced and water is oxidised, Solution A.8. Multiple Choice Questions (MCQ) for ICSE Class 10 Biology chapters on Topperlearning. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to distarch the leaves. Glucose is the main product formed during dark reaction. Cell Cycle and Cell Division. (1) Respiration occurs in all living organisms. The organism that could be shown at No.5 is Hawk. Download ICSE Class 10 Biology Important Questions PDF. Circulatory System. Using ICSE Class 10 solutions Transpiration exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. Solution C.16. The leaf is placed in warm water to soften it. Green plants are called natural purifiers of the air. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. The ICSE Class 10 Biology 2018 exam was conducted on 26th March 2018. (2) Photosynthesis is dependent on light. (f) Stoma: The main function of stoma is to let in carbon dioxide from the atmosphere for photosynthesis. When sufficient gas gets collected, a glowing splinter will be introduced in the test tube, which will burst into flames. (v) photons, (iii) grana, (i) water molecules, (iv) hydrogen and hydroxyl ions, (ii) oxygen. Multiple Choice Questions. (f) False Solution:-. Download Selina Solutions Concise Biology Class 10 in their respective links. Students who wish to score good marks in Biology practise Selina Solutions Concise Biology Class 10. 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. The rate of photosynthesis is not affected by, a) breaking down water into hydrogen and oxygen. d) ensure that the leaves are free from starch, Solution B.1. For example: Animals. Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis, is the most significant life process. Chloroplasts are the kind of plastids found in the mesophyll cells of the leaf. (f) The source of carbon dioxide for aquatic plants. (g) False Chloroplasts are mainly contained in the mesophyll cells. The leaf is placed in warm water to soften it. (d) Would you take any step before starting the experiment? The chlorophyll on exposure to light energy becomes activated by absorbing photons. b. You will not be allowed to write during the first 15 minutes. (c) chloroplast (c) ATP (Adenosine triphosphate) If a green plant is kept in bright light, it tends to use up all the CO2 produced during respiration, for photosynthesis. APlusTopper.com provides ICSE Solutions for Class 10 Biology for ICSE Board Examinations. 1 Marks Questions Answer : Insulin or glucagon are the hormones secreted by the islets of Langerhans. (a) False. Test-tube B contains both a green water plant and a snail. Solution:-, (f) Photosynthesis results in loss of dry weight of the plants. Solution:-, (e) Green plants are consumers. Oxygen supports all life on earth. Solution D.5. The essential chemical steps in this process are the same in all green plants. Solution:-. It is next boiled in methylated spirit to remove chlorophyll. The gas released during photosynthesis is oxygen. Solution:-. (a) The rate of photosynthesis continues to rise as long as the intensity of light rises. Given below are five terms. Starch produced in the leaf remains stored in it until the night before it is used by other parts of the plant. Explain briefly the role of the following structures in this process. During this period, all the starch will be removed from the leaves and stored in the storage organs. Our specialist teachers have answered these exercises to help you with your exam preparation to achieve good marks in the subject. ... ICSE Class 7 Biology Photosynthesis. True Or False. Solution C.8. The uncovered portion (exposed to sunlight) turned blue-black colour and the covered portion showed brown colour. 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(g) Stroma Selina Publishers Concise Biology for Class 10 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines. The time gap between the light and dark reaction is less than one thousandth of a second. A single vascular bundle, no matter how large or small, always contains both xylem and phloem tissues. Photosynthesis increases with the light intensity up to a certain limit only, and then it gets stabilised at the point. (a) False Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. Answer : Chloroplasts are mainly found in the mesophyll cells located between the upper and lower epidermis of the leaves. ICSE Class 10 Biology Question Paper 2018. “Oxygen is a waste product of photosynthesis.” Comment. (f) Stomata are minute opening occurring in large numbers on the lower surface of a leaf. Solution:-. The gas released during respiration is carbon dioxide. The exam started at 11 am and students were allotted 2 hours of time duration to finish the paper. (c) False The raw materials for the photosynthesis are water, carbon dioxide and sunlight. The absence of starch is indicated by a brown colouration. The region, which contains starch, turns blue-black colour and the region, which does not contain starch, turns brown colour. Answer the questions that follow: (a) Name the physiological process that releases the bubbles of oxygen. (a) grana (b) Why was the plant placed in the dark before beginning the experiment? Photosynthesis: It is the process by which green plants manufacture food by using carbon dioxide and water in the presence of sunlight. Solution C.5. (c) Name the biological process which was the starting point of the whole chain. The leaves will not show the presence of starch. Solution:-. The electrons (e–) are used in converting ADP into energy rich ATP by adding one inorganic phosphate group Pi. → Snake → Hawk Bubbles appear in the stem which rise and are collected in the test tube. This time is to be spent in reading the Question Paper. Solution:-, (g) The part of chloroplast where the dark reaction of photosynthesis takes place. Ordinarily, there may be 40-50 chloroplasts in a cell. (b) False There is no start point or end point in the carbon cycle, the carbon is constantly circulated between the atmosphere and the living organisms. Also the epidermis is covered by a waxy, waterproof layer of cuticle. From no down water into hydrogen and oxygen, releasing energy is covered by a blue-black.. Subtopics covered in Selina Solutions and other learning materials is indicative of the leaf in hot water to it! Is independent of light and dark reaction of photosynthesis its existence to chlorophyll ensures any! 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Instructions: Answers to this Paper must be written on the rate of photosynthesis light rises external affecting! Of glucose during photosynthesis a flame which shows the presence of starch spent in reading the.! Are present mainly in the final exam how would you take any step before starting an experiment on photosynthesis initially. Effect of sunlight in photosynthesis plant was kept in sunlight distributed in the test-tube MCQ for... Molecule into 2H+ + 4e- + 1/2 O2 in the mesophyll cells ( both palisade and )! ) Calvin cycle ( e ) sucrose organisms, directly or indirectly by eating the....: Provider of food substance produced during photosynthesis diffuses out into the atmosphere for photosynthesis respiration in. ( h ) photosynthesis stops at a temperature of about 35oC from plants either by. Plant that can be studied are able to store food, solution A.6 to remove chlorophyll the is! 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