iii. They are called so, because they provide the energy requirement for CO2 assimilation during dark reaction of photosynthesis. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’. The potted plant was kept in the dark for 24 hours. Radiant energy 4. Out of nine types of chlorophyll, chlorophyll ‘a’ and ‘b’ are most abundant. (v). Answer: See figure. Hence, the ability to collect raw materials and to carry on chemical reactions to synthesize food, it is called as the food factory of the plant. Carbon cycle. Answer: (1) I will select white light because photosynthesis is maximum in white light while it is minimum in green light as green light is reflected by green plants. Answer: Photochemical phase of photosynthesis is light dependent. Check back soon! Answer: Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment, which comes from dead animals and plants. (i) What is the aim of the experiment ? A high energy reduced compound formed in the light reaction and enter into the dark reaction. Answer: The chlorophyll traps solar energy and converts it into chemical energy. The leaf was then tested for starch. Question 9: Why is photosynthesis important in nature ? (v) Give the chemical equation to represent the process of starch formation in plants. The formula for photosynthesis is 6CO2 + 6H2O + light energy = C6H12O6 + 6O2. The raw materials for photosynthesis include water and CO2. ... Photosynthesis is an endothermic reaction because energy, in the form of sunlight is absorbed during the process of photosynthesis by green plants. Chlorophyll is present: (a) In the grana of chloroplast (b) On the surface of chloroplast (c) Dispersed throughout the chloroplast (d) In the stroma of chloroplast, 2. (iv) Give a well balanced equation to represent the process. Water may be used inside the plant but O2 released into the atmosphere. Answer: A destarched plant has no starch present in the leaves and a leaf remains yellowish-brown when tested with iodine during a starch test. Stomata (ii) One vein has been shown. According to this law when a process is conditioned to its rapidity by a number of separate factors, the rate of process is limited by the pace of the lowest factor, i.e., the factor which is present in minimum amount. Question 3: Give some adaptations in a green leaf for photosynthesis. After a few hours, test this and any other leaf of this plant for starch. The chloroplasts are the actual sites of photosynthetic reactions-light and dark reactions which result in the formation of glucose. Nicotinamide Adenine Dinucleotide Phosphate 13. (iii) What is the aim of the experiment? To register Biology Tuitions on Vedantu.com to clear your doubts. Explain this statement. (ii) What is the special condition inside the flask ? The chemical substance used to test the presence of starch in the cell of a leaf. 2. Question 19: What is the law of limiting factor ? Answer: Question 4: Autotrophs and Heterotrophs. Events in photosynthesis Photosynthesis can be split into three basic events. (iii) Select the correct leaf from the five available choices shown in the diagram as A, B, C, D and E. Rewrite the correct answer for the filling in the appropriate letter from the questions that follow: 1. During election transfer NADP get reduced and (rom NADP + H (NADPH2). 3. (True). Photosynthesis ICSE Class-10 Concise Selina Biology Solutions Chapter-6. In words, the equation may be stated as: Six carbon dioxide molecules and six water molecules react to produce one glucose molecule and six oxygen molecules. Answer: (i) In the cell organelle called plastids (or chloroplasts). Then in the early hours of the morning she covered one of the leaves with black paper in the centre only. Which process is the ultimate source of energy for all living organisms ? (ii) It occurs in the grana of chloroplast. Photosynthetic Membrane 8. Overview of photosynthesis. Formation of ATP in the chioroplast in the presence of light is called photophosphorylation. What is the percentage of CO2 in air ? After the starch test, leaf Y would look like. Oxygen is given out by green plants. Question 5: ATP is needed for dark reaction. The dark reaction of Photosynthesis is light independent. (a) Loss of half of its branches (b) Loss of half of its flowers (c) Loss of all of its leaves (d) Loss of a little bark, 6. ATP 2. (b) Increases because more photosynthesis occurs. (ii) The special condition inside the flask is that there is no CO2 in the air as it has been absorbed by the KOH. 160 billion metric tons of carbohydrate; Q15: Deficiency of metal 'X' causes lack of formation of chlorophyll in a plant. Glucose 9. What photosynthesis accomplishes, why it's important, and how the light-dependent and light-independent reactions work together. Question 16: Explain why transpiration and photosynthesis are interlinked during the day. (ii) It is positioned at a right angle to the light to get maximum light. Answer: (i) The student is investigating the necessity of sunlight for photosynthesis. The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen. 11. The purification of the atmosphere whereby the volume of CO2 remains fairly constant due to the photosynthetic activity of green plants. Question 1: Draw a neat and well-labeled diagram of the Chloroplast. A plant can be destarched by keeping it in the dark for two or three days, so that the leaves are free from stored starch. Radiant energy is converted into chemical energy by photosynthesis. 12. (False, The unit of light absorbed by the chlorophyll during photosynthesis is the photon or quantum.) Answer: During the day, the chloroplast in the guard cells are able to carry on photosynthesis, so the osmotic pressure in the cell sap of the guard cells is high and water enters the guard cells which lead to an opening of the stomatal aperture. Explain that Plants Are Alive, Just Like Us. (d) Decreases because carbon dioxide acts as a limiting factor. NCERT Class 10 Science Lab Manual – Light is Necessary for Photosynthesis. (b) Why would you select a destarched plant ? Question 20: Complete the following food chains by writing the names of appropriate organisms in the blanks: Answer: (i) Grasshopper, Hawk (ii) Grass, Insects, (iii) Rabbit, (iv) Com, Snake. (ii) Name the chemical used for testing the presence of starch. (Photo = Light, lysis = Breaking). Answer: This process produces food and releases oxygen, both of which are necessary to maintain life on earth. (d) H+ combines with CO2 in dark reaction to produce glucose. Answer: ATP and NADPH2 are called assimilatory power. Now keep the potted plant in light. (ii) 1. It's where the plants and the trees and all the green stuff that you find around yourself take in water and carbon dioxide from their surrounding, and then use the energy of the sun to manufacture their own carbohydrate molecules. These OH– react to liberate oxygen. 9. (ii) Iodine solution. (iv) Give an overall balanced chemical equation to represent the process named in (i) above. Compensation point means the condition: (a) When the entire food manufactured in photosynthesis remains unutilised (b) When the pot is watered just to meet the full requirement of the plant (c) When rate of photosynthesis is equal to rate of respiration (d) Where there is neither photosynthesis nor respiration. Xylem 5. (ii) Now the potted plant is kept in light. Question 17: Explain, why respiration is said to be a reversed process of photosynthesis ? (ii) No CO2 in the flask. NADP is expanded as: (a) Nicotinamide, adenosine dinucleotide phosphate (b) Nicotinamide, adenine dinucleotide phosphate (c) Nicotinamide, adenine dinucleous phosphate (d) Nicotinamide, adenosine dinudeous phosphate, 7. (iii) The plant is kept in the dark before the experiment to destarch the leaves. Iodine, Question: 1. Phloem 11. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. 7. It is rinsed with hot water to remove alcohol and spread it on a white tile. Thus they are dependent on photosynthesis. I. The light-independent reactions use energy from the supply of electrons to reduce carbon dioxide to produce glucose. (Carbon-di-oxide) 4. No transpiration occurs during photosynthesis. 8. (ii) Oxygen. (iii) Briefly describe the reactions occurring in the leaves of the water weeds leading to the evolution of these bubbles. Answer: Oxygen liberated during photosynthesis is a waste for the plant, so, it is released into air and is used by living organisms in respiration. Photosynthesis: It is the process by which green plants manufacture food by using carbon dioxide and water in the presence of sunlight. NADP 10. (iii) What do you conclude from this experiment? 230-250 molecules of chlorophyll make one quantasome. 3. Thus we can say that oxygen liberated during photosynthesis comes from water. (b) I will select destarched plant so I can demonstrate the synthesis of starch through iodine test. (iii) (1) To kill the cells. 3. Phosphorylation 9. The site of light reaction in the cell of a leaf. Question 1: What are the basic requirements of photosynthesis ? Photosynthesis 2. Question 22: What is meant by destarched plant ? Chloroplast 4. A plant that does not perform photosynthesis is Fungus. Photosynthesis 2. Hemera Technologies/AbleStock.com/Getty Images, The Estrella Mountain Community College Website online Photosynthesis web page, "Advanced Biology;" M. Jones and G. Jones; 1997. Question 2: Photosynthesis is considered as a process supporting all life on earth. Question 11: “Oxygen is a waste product of photosynthesis.” Comment. (iii) State the functions of part 4 and 5. The numeral ‘1’ represents a certain condition inside the flask and the numeral ‘2’ represents a chemical responsible for this condition. In most plants, water is supplied from the roots, with the leaves collecting carbon dioxide via the stomata and sunlight captured by the chloroplasts in the leaves. (iii) (a) I will select white light because photosynthesis is maximum in white light while it is minimum in green light as green light is reflected by green plants. photosynthesis were known, namely, that plants could use light energy to make carbohydrates from CO 2 and water. (ii) What is the function of sodium hydroxide solution in the flask? (ii) Explain the process. (iii) To show that oxygen is given out during photosynthesis. Question 21: On a bright sunny day water weeds growing in an aquarium were actively giving off bubbles of.gas. Phosphorylation: The covalent attachment of a phosphate group to a molecule. 12. Answer: (i) To prove that CO2 is necessary for photosynthesis. CO2 is the life supporting gas produced due to photosynthesis. Question 24: A healthy croton plant bearing variegated leaves was kept in a dark cupboard to destarch it after which it was placed in sunlight for a few hours. If a green plant is kept in bright light, it tends to use up all the CO2 produced during respiration, for photosynthesis. (iv) The green parts of the leaf turned blue-black while non green parts turned brown. (True) 19. (iii) Name the phenomenon which takes place in the above diagram. Question 27: Write an experiment to demonstrate that CO2 is necessary for photosynthesis. (iv) The leaf is tested for presence of starch as follows: Question 26: A potted plant was taken in order to prove a factor necessary for photosynthesis. Answer: (i) Chlorophyll is necessary for photosynthesis. (iii) Why was the plant kept in the dark before the experiment ? (v) If some sodium bicarbonate is added to the water the rate of bubble formation: (a) Increases because more respiration occurs. 6. It takes place is chlorophyll containing thylakoids of chloroplast. 5. Answer: The chlorophyll traps solar energy and converts it into chemical energy. (True) 10. 2. In words, the equation translates to the combining of water, carbon dioxide and light energy to produce glucose and oxygen. (True) 8. 0.03-0.04% 6. Photosynthesis in One Shot | ICSE/CBSE Class 10 Biology | How Does Photosynthesis Happen?. The immediate product of photosynthesis. Free Energy: The amount of energy in a reactions available to do work. APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 5 Photosynthesis for ICSE Board Examinations. (iv) What change is seen on the leaf after the starch test ? It takes place in chlorophyll containing thylakoids of chloroplast. Glucose, Water, Oxygen, Carbon-dioxide. (vi) The region of the leaf that was under the black strip turns yellowish-brown showing that no starch was made, while the rest of the leaf turns bluish-black showing the starch was made in the presence of light. Candidates who are ambitious to qualify the Class 10 with good score can check this article for Notes. The equation depicts the process by which plants and some bacteria produce glucose from carbon dioxide and water using energy from sunlight, as indicated in Jones and Jones' Advanced Biology Textbook (1997). Answer: Green leaves are thin and broad so that they can receive more light and can photosynthesize more efficiently. 13. 11. Answer: (i) 1. 2. Water 5. The part of the chloroplast where the dark reaction of photosynthesis takes place. Question 4: What is the importance of photosynthesis in the life of the following : (i) Green plants (ii) Non-green plants (iii) Animals Answer: (i) Green plants are able to build up complex energy rich molecules of carbohydrates which are further used for different metabolic activities of cells. Question 6: Respiration is said to be the reversal of photosynthesis. Based in Manchester, England, John Newton has been writing since 2006. (iii) Animals eat green plants or eat animals that feed on green plants. (True) 15. (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. NADP (Nicotinamide Adenine dinucleotide phosphate): It is a coenzyme. Answer: When a plant is kept in sunlight, CO2 released by respiration gets used by photosynthesis to synthesize food. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide. Calvin cycle was proposed by Melvin Calvin. KSEEB Class 10 Science Chemical Reactions and Equations Additional Questions and Answers. The leaf absorbs CO2 from the atmosphere through its stomatal openings. Question 9: (i) Draw a neat and well-labelled diagram of the Chloroplast.
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