(c) Place the apparatus in the sun for a few hours. Both test-tubes are kept in sunlight. How would you demonstrate that green plants release oxygen when exposed to light? Place the leaf in a Petri dish and pour iodine solution over it. they are able to produce their own food from basic raw materials. Also the epidermis is covered by a waxy, waterproof layer of cuticle. (c) Stroma is ground substance in  chloroplast. (e) In the flowering plants, food is transported in the form of……………………… (sucrose, glucose, starch). Our specialist teachers have answered these exercises to help you with your exam preparation to achieve good marks in the subject. During this period, all the starch will be removed from the leaves and stored in the storage organs. Raksha planted many plants in her home garden as she knew that the plants help to purify air. The dark reaction of photosynthesis is known as Calvin cycle. The leaf is placed in warm water to soften it. (c) Mesophyll cells: Mesophyll cells are the main sites for photosynthesis. Complete the following food chains by writing the names of appropriate organisms in the blanks: 14. Carbon dioxide is used up and oxygen is released. Short Questions. Required fields are marked *. 16. This matter comes from dead animals and plants. Photosynthesis prepared by Academic team of Entrancei . 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. Excretory System ICSE Class-10 Concise Selina Biology Solutions for ICSE Class 10 Chapter-9. Both test-tubes are kept in sunlight. The potted plant was kept in the dark for 24 hours. (c) The compound which stores energy in the cells. Solution:-. Draw a neat diagram of the stomatal apparatus found in the epidermis of leaves and label the Stoma, Guard cells, Chloroplast, Epidermal cells, Cell wall and Nucleus. Photosynthesis: This module focuses on mechanism of photosynthesis. The presence of starch is indicated by a blue-black colour. The potted plant was kept in the dark for 24 hours. So, oxygen is not a waste of photosynthesis because all organisms require it for their existence including the plants. Mention one difference between the following on the basis of what is given in brackets. Respiration results in loss of dry weight of the plants. 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. Phloem is the tissue that transports manufactured type of starch from leaves to all parts of the plants. (c) What is the purpose of keeping a snail in test-tube B? To study the effect of sunlight on the rate of photosynthesis. This increases the rate of photosynthesis in the plant placed in test tube B. Respiration results in loss of dry weight of the plants. One of the leaves was covered with black paper in the centre. Solution:-, To study the effect of sunlight on the rate of photosynthesis. Why? Give reason. 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. (c) If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesise in bright sunshine. (iii) Genetics:Mendel’s laws of inheritance and sex linked inheritance … 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. One would easily think that the rate of photosynthesis will increase with light intensity. To test the leaf for starch, the leaf is boiled in water to kill the cells. b. (a) The category of organisms that prepare their own food from basic raw materials. 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 . 6. Question 1. Bubbles appear in the stem which rise and are collected in the test tube. This increases the rate of photosynthesis in the plant placed in test tube B which leads to the release of more amount of oxygen. 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. 7. “Oxygen is a waste product of photosynthesis.” Comment. d. The gas released by green plants during photosynthesis. MULTIPLE CHOICE TYPE Photosynthesis ICSE Class-10 Concise Selina Biology. Which one chemical reaction occurs during photosynthesis? All life owes its existence to chlorophyll. (c) Name the biological process which was the starting point of the whole chain. (i) In this phase, light plays a key role. b. The leaves will not show the presence of starch. Complete the following food chains by writing the names of appropriate organisms in the blanks: (ii) Grass/Corn → Mouse → Snake → Peacock. In the darkness, respiration alone is responsible for changes in the gaseous composition of the plant’s surrounding atmosphere. Extramarks, an e-learning website offers online tutorials for ICSE class 10 Photosynthesis & its Significance Chapter. March 1, 2019 / by shiksha. Good. 2)Dark reaction - It is independent of light and occurs in stroma region of plastids. Solution:-, (e) Chlorophyll and chloroplast (part of plant cell), 2. In a sense, even this oxygen is not a waste, because all organisms require it for their existence including the plants which require it at night. The uncovered portion (exposed to sunlight) turned blue-black colour and the covered portion showed brown colour. Visit official Website CISCE  for detail information about ICSE Board Class-10. The initiation of photosynthesis takes place when the chlorophyll molecule traps the light energy. (h) Photosynthesis occurs only in cells containing chloroplasts. The diagram below shows two test-tubes A and B. Test-tube A contains a green water plant. 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. The oxygen (O) component is given out as molecular oxygen (O2). The upper surface is thicker than the lower surface and also the epidermis is covered by a waxy, waterproof layer of cuticle. This experiment contains lime water it does not absorb CO2. Also most of the oxygen produced during photosynthesis diffuses out into the atmosphere through the stomata. 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. (i) Light reaction Give reason. Now place the leaf in hot water to soften it. A candidate studied the importance of certain factors in photosynthesis. (f) Write the overall chemical equation for the above process. Solution:-. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. 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. All green plants and a few other autotrophic organisms utilize photosynthesis to synthesize nutrients by using carbon dioxide, water and sunlight. Chlorophyll is the green colouring matter found in plants. Photosynthesis 10th Science ICSE Chapter 31 Marketing along with videos,solved papers and worksheets.These are helpful for students in doing homework or preparing for the exams Invert a test tube full of water over the stem of the funnel. (c) Name the biological process which was the starting point of the whole chain. If so, state it. These notes are totally based on latest Biology textbook of ICSE Board. Photosynthesis increases with the light intensity up to a certain limit only, and then it gets stabilised at the point. (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 …………. When sunlight falls on the leaf, the light energy is trapped by the chlorophyll of the upper layers of mesophyll, especially the palisade cells. 5. The starting point of any food chain is always a plant. He took a potted plant and kept in the dark for over 24 hours. Chloroplasts are mainly contained in the mesophyll cells. 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. (e) The starting point of carbon cycle is the release of carbon dioxide by animals during respiration. If so, state it. Solution:-. Excellent. A plant used for experiments on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. (d) The first form of food substance produced during photosynthesis. (a) The rate of photosynthesis continues to rise as long as the intensity of light rises. Correct Statement: Green plants are producers. 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. State any four differences between photosynthesis and respiration. The rate of photosynthesis increases up to the temperature 35oC after which the rate falls and the photosynthesis stops after 40oC. Given below is the representation of a certain phenomenon in nature. During photosynthesis, the oxygen in glucose comes from, (a) The category of organisms that prepare their own food from basic raw materials. Question 15 : Complete the following statement by filling in the blanks with the appropriate word from the choices given in … 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. Green grass being a producer is capable of producing its own food by photosynthesis. Date. A glowing splinter bursts into a flame which shows the presence of oxygen. Solution:-, (c) Starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of the plant. The purpose of keeping a snail in test-tube ‘B’ is to increase the rate of photosynthesis by increasing the concentration of carbon dioxide. The appearance of a blue-black colour on the leaf is indicative of the presence of starch. (a)  Fill up the gaps, in blank spaces (1-4), by writing the names of the correct items. One of the leaves was covered with black paper in the centre. Give reason in support of your answer. Given below is a schematic diagram to illustrate some aspects of photosynthesis. It is not possible to demonstrate respiration in green plants kept in sunlight because during day time plants are undergoing photosynthesis. Hence most leaves have the upper surface more green and shiny than the lower one. Place hydrilla plant (a water plant) in a beaker containing pond water and cover it by a short-stemmed funnel. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to distarch the leaves. 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