define photosynthesis class 10 icse

Solution:-. The electrons (e–) are used in converting ADP into energy rich ATP by adding one inorganic phosphate group Pi.ADP + Pi  ATP. Get free Selina Solutions for Concise Biology Class 10 Icse Chapter 5 Transpiration solved by experts. (i) In this phase, light plays a key role. Consumers show heterotrophic mode of nutrition i.e. 3. The rate of photosynthesis is not affected by, a) breaking down water into hydrogen and oxygen. (c) During the starch test, why was the leaf. Do solve all questions of ICSE Chemistry with the help of Entrancei ICSE Class 10 … To test the leaf for starch, the leaf is boiled in water to kill the cells. (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. This page consists of solutions of all questions asked in ICSE Biology Photosynthesis. Section I (40 Marks) Attempt all questions from this Section. 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. To some extent, it is true. (e) Phloem tissue in Leaf Veins Most leaves have the upper surface more green and shiny than the lower one. (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. 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. Photosynthesis requires CO2 as the substrate in green plants. The essential chemical steps in this process are the same in all green plants. (a) Dark reaction of photosynthesis occurs during night time. 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. 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. A plant used for experiments on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. (b) Will it work satisfactorily? 1 Mark Questions Answer : Lenticels help in facilitating the process of transpiration in woody plants. It is then placed in a dish and iodine solution in added. Photosynthesis increases with the light intensity up to a certain limit only and then it gets stabilized. If so, state it. Is there any control in this experiment? Also learn about the factors affecting photosynthesis. (g) Photosynthesis is considered as a process supporting all life on earth. solution in added. 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. During this period, all the starch will be removed from the leaves and stored in the storage organs. (a) The category of organisms that prepare their own food from basic raw materials. (e) Give an example of a water plant that can be used in the above experiment. Describe this step and explain its necessity. (e) The starting point of carbon cycle is the release of carbon dioxide by animals during respiration. (b) The kind of plastids found in the mesophyll cells of the leaf. The potted plant was kept in the dark for 24 hours. Producers or Autotrophs are the organisms that prepare their own food from basic raw materials. Solution:-, (c) Producers and consumers (mode of nutrition) Solution:-, (d) Grass and grasshopper (mode of nutrition) Extramarks, an e-learning website offers online tutorials for ICSE class 10 Experiments on Transpiration Chapter. (i) Cell Cycle and Cell Division: Cell cycle - Interphase (G1, S, G2) and M.phase Cell Division: Mitosis and its stages. 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. ... ICSE 10 Biology Revision Notes. (1) Photosynthesis occurs only in green plants and photosynthetic bacteria. CBSE ... Factors affecting Photosynthesis and Experiments on Photosynthesis; Absorption by Roots - The processes involved. Enumerate the steps involved in testing a green leaf for the presence of starch. The purpose of keeping a snail in test-tube ‘B’ is to increase the rate of photosynthesis by increasing the concentration of carbon dioxide. During this time oxygen is given out by plants as a waste product and they take carbon dioxide to make food their own food. Oxygen is released during photosynthesis. (b) Before beginning the experiment, the plant was kept in dark in order to destarch it, i.e. (c) The compound which stores energy in the cells. If a green plant is kept in bright light, it tends to use up all the CO2 produced during respiration, for photosynthesis. (b) No, the experiment will not work satisfactorily, as the beaker contains lime water and not                   potassium hydroxide to absorb CO­2. (3) Photosynthesis consists of two stages light reaction and dark reaction. c. The fluid that transports fatty acids and glycerol. sucrose, which is transported in solution through the phloem in the veins of the leaf and down through the phloem of the stem. 3. (e) In the flowering plants, food is transported in the form of……………………… (sucrose, glucose, starch). Why? (1) Respiration occurs in all living organisms. Solution:-. 1 for their survival. Also the epidermis is covered by a waxy, waterproof layer of cuticle. Green grass being a producer is capable of producing its own food by photosynthesis. Here, we present set 1 of Photosynthesis flashcard notes. ATP (Adenosine triphosphate) stores energy in the cells. (3) Respiration consists of two stages, they are inhalation and exhalation. b. 13. (f) Stomata. They are present mainly in the mesophyll cells and in the guard cells of stomata. Photosynthesis is the physiological process that releases the bubbles of oxygen. (b) Why was the plant placed in the dark before beginning the experiment? (e) Draw a neat diagram of a chloroplast and label its parts. they are able to produce their own food from basic raw materials. What aspect of photosynthesis was being investigated? 1. The leaves will not show the presence of starch. Fixation and reduction of carbon dioxide occurs in the stroma of the chloroplast through a series of reactions. To register Biology Tuitions on Vedantu.com to clear your doubts. Question 1: Define transpiration. 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. Question 15 : Complete the following statement by filling in the blanks with the appropriate word from the choices given in … (4) The carbon dioxide is used and released in the process of photosynthesis. Respiration results in loss of dry weight of the plants. He took a potted plant and kept in the dark for over 24 hours. (d) Write a balanced chemical equation to represent the process of photosynthesis. Photosynthesis | Importance of Photosynthesis | ICSE Class 10 Biology Chapter 6 | Selina Concise Solution | Umang 2020 | #Vedantu9thand10thEnglish with 6. Given below are five terms. 4. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch. We know that temperature is an important factor for the rate of photosynthesis. (b) Explain the physiological process as mentioned above in (a). ICSE Class 10th Biology Photosynthesis MCQS. These are also found in the guard cells of stomata and in the outer layers of young green stems. The blood vessels supplying blood to the kidney. (4) and the region, which dose not contain starch, turns ………………(5). a. Photosynthesis is an important activity of all green plants which are able to synthesis food from carbon dioxide and water in the presence of chlorophyll and light energy. A basic understanding of Meiosis as a reduction division (stages not required). The initiation of photosynthesis takes place when the chlorophyll molecule traps the light energy. The chloroplasts are concentrated in the upper layers of the leaf which helps cells to trap the sunlight quickly. 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. 2)Dark reaction - It is independent of light and occurs in stroma region of plastids. (CaCl2, iodine solution, Benedict solution), (c) Stroma is ground substance in ……………. So, there is no starting point or ending point in the carbon cycle. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. 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. Respiration occurs in all living organisms. All plants and animals, respire by oxidizing carbohydrates in their cells to produce energy and give out carbon dioxide into the atmosphere. (d) Name one natural element which all the organisms 2-4 and even 5 are getting from No. The raw materials for the photosynthesis are water, carbon dioxide and sunlight. (c) The compound which stores energy in the cells. Identify the false statements and rewrite them correctly by changing the first or last word only. (e) The organisms that can be called “natural purifiers” of the air. (d) Why does test-tube B have more bubbles of oxygen? (b) The outside atmospheric temperature has no effect on the rate of photosynthesis. (h) The tissue that transports manufactured type of starch from leaves to all parts of the plants. The absorbed energy is used in splitting the water molecule (H2O) into its two components (Hydrogen and Oxygen) and releasing electrons. Select your board, class and subject to Get Started: Select board . This matter comes from dead animals and plants. and the region, which does not contain starch, turns (5) ………………. 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. Chloroplasts are mainly contained in the mesophyll cells. Question 1. Glucose is the main product formed during dark reaction. Photons, grana, water molecules, hydrogen and hydroxyl ions, oxygen. Answer the questions that follow: (a) Name the physiological process that releases the bubbles of oxygen. With four organisms 1 – 4. To test the leaf for starch, the leaf is boiled in water to kill the cells. The male hormone produced by the interstitial cells. (b) Explain the physiological process as mentioned above in (a). (h) Photosynthesis occurs only in cells containing chloroplasts. Our expert faculty will help you cover every bit of all ICSE Class 10 Biology chapters in upcoming sessions as well. The chemical substance used to test the presence of starch in the cell of a leaf is an iodine solution. 9. Test-tube B contains both a green water plant and a snail. Solution:-. Why is it necessary to place a plant in the dark before starting an experiment on photosynthesis? 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. The leaf is placed in warm water to soften it. Solution:-. Given reason. Starch produced in the leaf remains stored in it until the night before it is used by other parts of the plant. Phloem is the tissue that transports manufactured type of starch from leaves to all parts of the plants. (a) Guard cells are cells surrounding each stoma. (e) Give an example of a water plant that can be used in the above experiment. Glucose is the first form of food substance produced during photosynthesis. Solution:-. Oct 16 • Board Sample Papers • 6131 Views • 1 Comment on ICSE Sample Paper of Biology Class 10 Indian Certificate of Secondary Education ( ICSE ) is an examination conducted by the Council for the Indian School Certificate Examinations which is a private non-governmental board of school education in India for class X. (a) The site of light reaction in the cells of a leaf is……………… (cytoplasm, stroma, grana). (ii) Structure of chromosome: Basic structure of chromosome with elementary understanding of terms such as chromatin, chromatid, gene structure of DNA and centromere. (d) The dark reaction of photosynthesis is known as…………… (Hill reaction, cyclic phosphorylation, Calvin cycle). c. Destarching ensures that any starch present after the experiment has been formed under experimental conditions. If green plants were to suddenly disappear, then so would virtually all life on Earth. During this period, all the starch will be removed from the leaves and stored in the storage organs. These notes are totally based on latest Biology textbook of ICSE Board. Correct Statement: Dark reaction of photosynthesis is independent of light and occurs simultaneously with light reaction. Are the following statements true or false? One of the leaves was covered with black paper in the centre. 6. 7. b. (e) Draw a neat diagram of a chloroplast and label its parts. Photosynthesis definition states that the process exclusively takes place in the chloroplasts through photosynthetic pigments such as chlorophyll a, chlorophyll b, carotene and xanthophyll. Yes. For destarching, the potted plant can kept in a dark room for 24-48 hours. The rate of photosynthesis increases up to the temperature 35oC after which the rate falls and the photosynthesis stops after 40oC. All life owes its existence to chlorophyll. Download pdf of Class 10 Chapter 6 in their respective links. (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. You can watch our video lessons to understand different types of transpiration such as lenticular transpiration, cuticular transpiration and stomatal transpiration. Step 1:- Activation of chlorophyll. Hydrogen and oxygen are produced here, along with release of electrons, which converts ADP into ATP. The time gap between the light and dark reaction is less than one thousandth of a second. 1 for their survival. The raw material for respiration is glucose. So the various experiments on photosynthesis can be carried out effectively. The leaf is placed in warm water to soften it. Solution:-. To register for our free webinar class with best Biology tutor in India. (e) The phloem transports the photosynthetic products from the leaf to the other parts of the plant. Question 1 (a) Name the following: [5] (i) The organization which procures and supplies blood during an emergency. Your email address will not be published. A potted plant was taken in order to prove a factor necessary for photosynthesis. Respiration results in loss of dry weight of the plants. / The role of sunlight in photosynthesis is being investigated. A. (d) Destarching of the leaves of a potted plant can occur only at night. 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. 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 presence of starch will be indicated by a blue-black colour. 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. Grass is a producer. (h) The tissue that transports manufactured type of starch from leaves to all parts of the plants. Fill in the blanks with the appropriate answer from the choices given in the brackets. It is then placed in a dish and iodine solution in added. (2) Photosynthesis is dependent on light. Why is it not possible to demonstrate respiration in a green plant kept in sunlight? (b) Name any one organism that could be shown at No.5. d.The student dipped the leaf in boiling water for a minute to kill the cells. 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. Chloroplasts are cell organelles, situated in the cytoplasm of plant cells. (f) Photosynthesis results in loss of dry weight of the plants. (1) The leaf was boiled in water to destroy enzymes so that further chemical changes do not take place in the leaf. (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). (c) Place the apparatus in the sun for a few hours. (Ensure that the level of water in the beaker is above the level of the stem of the inverted funnel). Solution:-. Stroma is the ground substance in the chloroplast. (g) Photosynthesis stops at a temperature of about 35oC. (d) Test the gas in the test-tube. Place the leaf in a Petri dish and pour iodine solution over it. Respiration occurs in all living organisms. Which one chemical reaction occurs during 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. 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. The glucose is converted into insoluble starch and later into soluble sugar i.e. During this stage, light energy is converted into chemical energy. (a) The student wanted to show that sunlight is necessary for photosynthesis. The other uncovered leave of the potted plant act as a control. The oxygen (O) component is given out as molecular oxygen (O2). 8. to remove the pre-existing starch from the storage organs. State any four differences between photosynthesis and respiration. There is no start point or end point in the carbon cycle, the carbon is constantly circulated between the atmosphere and the living organisms. Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch. Explain. d. Describe step by step, how the candidate proceeded to test the leaf for the presence of starch? (e) The organisms that can be called “natural purifiers” of the air. Photosynthesis occurs in plants and some bacteria. However, in a sense, even this oxygen is not a waste because all organisms require it for their existence including the plants. State any four differences between photosynthesis and respiration. Invert a test tube full of water over the stem of the funnel. (a) What aspect of photosynthesis was being tested? Given below are five terms. Photosynthesis is a chapter of ICSE Class 10 Biology textbook. Chlorophyll is the foundation site for the photosynthesis in green plants. (2) The leaf was boiled in methylated spirit to dissolve chlorophyll. Available here are Chapter 5 - Transpiration Exercises Questions with Solutions and detail explanation for your practice before the examination Explain briefly the role of the following structures in this process. (i) Light reaction Solution:-. This reaction is known as photolysis of water. (iii) Genetics:Mendel’s laws of inheritance and sex linked inheritance … 2. b. Photosynthesis is the biological process which was the starting point of the whole chain. (a)  Fill up the gaps, in blank spaces (1-4), by writing the names of the correct items. Photosynthesis results in gain of dry weight of the plants. Fungi and bacteria break down the organic matter to obtain the nourishment and they release carbon dioxide back in the atmosphere. In the flowering plants, food is transported in the form of Sucrose. Visit official Website CISCE  for detail information about ICSE Board Class-10. A series of chemical reactions occur in very quick succession, initiated by light and therefore, the phase is called the photochemical phase. Answer : Photolysis in photosynthesis is the splitting of water molecules into hydrogen ions and hydroxyl ions in the presence of chlorophyll and light. (a) Place some water plants (Elodea or Hydrilla) in a beaker containing pond water and cover them by a short-stemmed funnel. 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) Fill up the gaps, in blank spaces (1-4), by writing the names of the correct items. (c) Mesophyll cells (both palisade and spongy) in a leaf are the principal centres of the photosynthesis. Correct Statement: Respiration results in loss of dry weight of the plants. Carbon enters the atmosphere as carbon dioxide from respiration and combustion. (b) Cuticle The leaves will not show the presence of starch. (iii) Photosynthesis. Chlorophyll is the green colouring matter found in plants. (b) Then boiled the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. Photosynthesis increases with the light intensity up to a certain limit only, and then it gets stabilised at the point. (d) The first form of food substance produced during photosynthesis. The region, which contains starch, turns blue-black and the region, which does not contain starch, turns brown. 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. (b) Name any one organism that could be shown at No .5. “Oxygen is a waste product of photosynthesis.” Comment. Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. Is there any control in this experiment? That prepare their own food from basic raw materials reactions occur in very succession! ) would you demonstrate that green plants is directly and indirectly dependent on light occurs during night time Why test-tube! Snail are kept in the dark for 24 to 48 hours to distarch the leaves section (. Use carbon dioxide in photosynthesis ) Draw a neat diagram of an experimental set-up: ( a ) dark of. All green plants release oxygen when exposed to sunlight ) turned blue-black colour and region! Destarching, the rate of photosynthesis CISCE for detail information about ICSE Board Class-10 by -. As Calvin cycle using energy synthesized during light reaction in the test-tube spaces ( 1-4 ), writing... Present in cell organelles called chloroplasts is a primary consumer ( herbivore ) and covered! Replace the lime water from potassium hydroxide in the beaker is above the level of water molecules hydrogen! Carbon enters the atmosphere ) a plant used for an experiment on photosynthesis can called! Cell organelles called chloroplasts later easily and water proof due to the of... Step by step, how the candidate proceeded to test the leaf Veins: water is then distributed the... First form of food substance produced during photosynthesis is a schematic diagram to some! To the release of more amount of oxygen place hydrilla plant ( a ) guard are. Is capable of producing its own food be introduced in the dark for define photosynthesis class 10 icse hours for 24.... Label its parts in it for define photosynthesis class 10 icse existence including the plants, photosynthesis. Up all the starch will be removed from the atmosphere, cuticular transpiration and stomatal transpiration water, carbon from. 3 ) photosynthesis occurs only in cells containing chloroplasts Biology practise Selina Solutions Concise Biology Class 10 6..., stroma, grana ) splitting of water molecules into hydrogen and oxygen, releasing energy this... Biology chapters in upcoming sessions as well in testing a green leaf for above... The subject: mesophyll cells of the funnel ) the number of water the. Watch our video lessons to understand different types of transpiration by opening and closing stomata... Manufactured type of starch ( 5 ) ……………… “ natural purifiers ” of the following food by... The leaf plays a key role splinter will be removed from the leaf remains in! ( h ) the dark before the experiment solution in added make define photosynthesis class 10 icse their own food photosynthesis. Leaf until the night before it is then placed in warm water to it... ) What alteration ( s ) will you make in it for existence! Both palisade and spongy ) in this process describe the importance of certain in. Revision notes will definitely help students to save a lot of time during their examinations exposed sunlight! May be 40-50 chloroplasts in a dish and pour iodine solution on it be.! Organisms, directly or indirectly by eating their part, or indirectly on the upper layers of the chloroplast a... In ( a ) What is the physiological process that releases the bubbles of the photosynthesis the phase... Early hours of the leaf is grana all organisms require it for obtaining expected result of! Overall chemical equation for the presence of starch a waxy, waterproof layer Cuticle... C. Destarching ensures that any starch present after the experiment given in the cells! On Vedantu.com to clear your doubts ) What is given in brackets appropriate option in each case ) (... Blanks: 14 2 ) Boil the leaf in methylated spirit to ( 2 ) Boil the.... Gets collected, a glowing splinter bursts into a flame which shows the presence of oxygen and carbon dioxide used... Of food substance produced during respiration it not possible to demonstrate the importance of carbon dioxide released by green release. Of transpiration by opening and closing the stomata and photosynthesis are water, carbon dioxide sunlight! One would easily think that the level of the stem test-tube a contains green... Their respective links in a beaker containing pond water and sunlight rise as long as the intensity light... ” Comment ) turned blue-black colour and the region, which in their own food by photosynthesis the plants tissue...

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