The atmospheric temperature is an important external factor affecting photosynthesis. We know that temperature is an important factor for the rate of photosynthesis. Given below is the representation of a certain phenomenon in nature. Download Formulae Handbook For ICSE Class 9 and 10. Revise the different types of nutrition in plants using TopperLearning’s ICSE Class 10 Biology concept videos, Selina solutions and other learning materials. Green grass being a producer is capable of producing its own food by photosynthesis. Respiration results in loss of dry weight of the plants. 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. To some extent, it is true. 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. 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. 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. Solution D.2. (c) False (d) Destarching of the leaves of a potted plant can occur only at night. Solution C.14. Important Questions Ask Doubt Take Test. (c) Name the biological process which was the starting point of the whole chain. Biology Questions and Answers ICSE Class 10. (4) The oxygen is used and carbon dioxide is released in the process of respiration. Answer the questions that follow: (a) Name the physiological process that releases the bubbles of oxygen. There is no start point or end point in the carbon cycle, the carbon is constantly circulated between the atmosphere and the living organisms. 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. The main function of the stomata is to let in CO2 from the atmosphere for photosynthesis. This matter comes from dead animals and plants. 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. b. (d) The first form of food substance produced during photosynthesis. Solution:-, (i) Green plants perform photosynthesis. Question 1: Define transpiration. Solution:-, (f) Photosynthesis results in loss of dry weight of the plants. The leaves will not show the presence of starch. 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To test the leaf for starch, the leaf is boiled in water to kill the cells. ... During the day guard cells begin photosynthesis and the sugar produced during the process increases the osmotic pressure which draws in water from the adjoining cells. (e) Give an example of a water plant that can be used in the above experiment. (b) Why was the plant placed in the dark before beginning the experiment? APlusTopper.com provides ICSE Solutions for Class 10 Biology for ICSE Board Examinations. (c) chloroplast Extramarks, an e-learning website offers online tutorials for ICSE class 10 Experiment on Photosynthesis Chapter. The time gap between the light and dark reaction is less than one thousandth of a second. and the region, which does not contain starch, turns (5) ………………. (e) False Answer : Chloroplasts are mainly found in the mesophyll cells located between the upper and lower epidermis of the leaves. Solution:-. (a) What aspect of photosynthesis was being tested? 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. (2) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. (c) Mesophyll cells: Mesophyll cells are the main sites for photosynthesis. 6. Photosynthesis: It is the process by which green plants manufacture food by using carbon dioxide and water in the presence of sunlight. How would you demonstrate that green plants release oxygen when exposed to light? 8. Oxygen supports all life on earth. Photosynthesis increases with the light intensity up to a certain limit only and then it gets … Students who wish to score good marks in Biology practise Selina Solutions Concise Biology Class 10. The physiological process being studied is Photosynthesisii. He took a potted plant and kept in the dark for over 24 hours. 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. Solution C.16. 5. (a) False. (a) The rate of photosynthesis continues to rise as long as the intensity of light rises. It is then placed in a dish and (3) …………. To study the effect of sunlight on the rate of photosynthesis. (f) False 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. The potted plant was kept in the dark for 24 hours. (Make sure the level of water in the beaker is above the level of the stem of the funnel). Genetics. Yes. A plant used for experiments on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. No living being can remain alive without oxygen. (Ensure that the level of water in the beaker is above the level of the stem of the inverted funnel). (Select the most appropriate option in each case), 1. Given below is the diagram of an experimental set-up: (a) What is objective of this experiment? Why is it not possible to demonstrate respiration in a green plant kept in sunlight? Solution:-, (e) Chlorophyll and chloroplast (part of plant cell), 2. Correct Statement: Starch produced in a leaf is stored temporarily in the leaf until the process 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. With the help of ICSE Class 10 Concise Selina Solutions, students get to analyze their level of preparation and work on their weak points. Get the free view of chapter 6 Photosynthesis Class 10 extra questions for ICSE Class 10 Biology and can use Shaalaa.com to keep it handy for your exam preparation (d) Xylem Tissue in the Leaf Veins: Water is essential for photosynthesis to occur. (a) Guard cells are cells surrounding each stoma. How do non-green plants such as fungi and bacteria obtain their nourishment? 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. (b) The chemical substance used to test the presence of starch in the cell of a leaf is…………… (CaCl2, iodine solution, Benedict solution). No, the experiment will not work satisfactorily because, as mentioned in the above statement carbon dioxide is very important in the photosynthesis. (d) Calvin cycle The leaf becomes hard and brittle. This matter comes from dead animals and plants, which in their own turn were dependent on photosynthesis. Keeping all that in mind, we have provided a summary of the ICSE syllabus for Class 10 Biology. Solution C.3. i. sucrose, which is transported in solution through the phloem in the veins of the leaf and down through the phloem of the stem. … Photosynthesis increases with the light intensity up to a certain limit only and then it gets stabilized. Give reason in support of your answer. (i) Light Reaction:  Yes, we have to take a step before starting the experiment. (e) Draw a neat diagram of a chloroplast and label its parts. (c) What alteration(s) will you make in it for obtaining expected result? Producers or Autotrophs are the organisms that prepare their own food from basic raw materials. (i) Grass → Rabbit. Download ICSE Class 10 Biology Important Questions PDF. a. Grass is a producer. All other organisms, directly or indirectly depend on this food for their survival. Practice biology sample question papers to score high in exams. (b) iodine solution Mark as IMP ... Topic Notes. Get all questions and answers of Photosynthesis And Respiration of ICSE Class 7 Biology on TopperLearning. → Snake → Hawk Solution:-. (b)The oxygen (O) component is given out as molecular oxygen (O2). CO2 is also the product of respiration. The phenomenon is represented above is the food chain. By studying these Selina ICSE Solutions for Class 10 you can easily get high marks in ICSE Class 10 Board Examinations. a) Carbon dioxide is reduced and water is oxidised, Solution A.8. (d) Why does test-tube B have more bubbles of oxygen? A series of chemical reactions occur in very quick succession, initiated by light and therefore, the phase is called the photochemical phase. So the various experiments on photosynthesis can be carried out effectively. Solution:-. The other uncovered leave of the potted plant act as a control. APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 10 Biology Chapter 6 Photosynthesis: Provider of Food for All. The presence of starch will be indicated by a blue-black colour. Mention one difference between the following on the basis of what is given in brackets. 8. (a) Guard cells Solution:-. 5. Students can download the ICSE Class 10 Biology Question Paper Solution 2018 PDF from the link below. (ii) Stroma lamellae. 2. Also the epidermis is covered by a waxy, waterproof layer of cuticle. Photosynthesis prepared by Academic team of Entrancei . d. Carbon. (c) Stroma is the ground substance in …………… (cytoplasm, chloroplast, ribosomes). ICSE Biology Previous year Question Paper 2019 Solved for Class 10 ICSE 2019 Biology Board Question Paper Solved. c. Place potassium hydroxide in the beaker instead of lime water Respiration occurs in all living organisms. (i) In this phase, light plays a key role. (c) False One of the leaves was covered with black paper in the centre. This page consists of solutions of all questions asked in ICSE Biology Photosynthesis. 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. 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 12. ICSE Class 10 Biology solutions for chapter-6 Photosynthesis. The region, which contains starch, turns (4) ……………. b. Hawk, eagle All exercise questions are solved & explained by expert teachers and as per ICSE board guidelines. The site of light reaction in the cells of a leaf is grana. Solution C.5. 15. All plants and animals, respire by oxidizing carbohydrates in their cells to produce energy and give out carbon dioxide into the atmosphere. 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. The uncovered portion (exposed to sunlight) turned blue-black colour and the covered portion showed brown colour. (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). During this period, all the starch will be removed from the leaves and stored in the storage organs. a. Light reaction includes the trapping of energy by chlorophyll, and this energy is used in splitting water molecules into hydrogen and oxygen (photolysis) and in producing ATP. If a green plant is kept in bright light, it tends to use up all the CO2 produced during respiration, for photosynthesis. Structure Of Chlorophyll. Animals are heterotrophic (different nutrition). ATP (Adenosine triphosphate) stores energy in the cells. Fixation and reduction of carbon dioxide occurs in the stroma of the chloroplast through a series of reactions. Maximum students of CISCE Class 10 prefer Frank Textbook Solutions to score more in exam. Food chain Destarching means removal of starch. Green plants (producers) use carbon dioxide of the air to produce carbohydrates and release oxygen to the atmosphere. Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment. 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