(Chlorophyll), 1. In activity 6.1 class 10 ncert ,why they have removed or utilised starch and then created by photosynthesis again.Why did not they directly took leaf and did the experiment. (iii) State the functions of part 4 and 5. Column ‘II’ is a list of items related to ideas in Column ‘I’. 11. The leaf which was exposed to the atmospheric air becomes blue black, and the one in the flask containing KOH does not become blue black after iodine test. (ii) What is the function of sodium hydroxide solution in the flask? (iii) Photosynthesis. 9. In photosynthesis radiant energy is converted into which from ? Too much light destroys chlorophyll. 3. (iii) Why is the leaf boiled in water and alcohol before testing for the presence of starch ? (b) Increase because more water is added. One of the product of Photolysis of water is oxygen. Which would do maximum harm to a tree? (b) I will select destarched plant so I can demonstrate the synthesis of starch through iodine test. (iii) Briefly describe the reactions occurring in the leaves of the water weeds leading to the evolution of these bubbles. Question 7: A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. Answer: The rate of photosynthesis decreases and finally stops when the green plant gets green light because green light is not absorbed but reflected back by the plant. (i) Explain why the rate of photosynthesis in plants is low both at lower and higher temperatures. Photosynthesis is the process through which plants convert light energy from the sun to chemical energy. Anatomy of leaves does not resemble Kranz anatomy. Take one leaf and cover it on both sides with two black paper strips, as shown in the diagram, with the help of cellophane tape. 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. Answer: The body of all living organisms both plants and animals is dependent on the food that has been synthesized in a green cell by photosynthesis. Leaves are considered to be the sites of photosynthesis. Name the process which is responsible for conversion of solar energy to chemical energy that is essential to sustain the life on this earth ? Answer: 1. How chlorophyll trap sunlight, what are the role of photosystem P680 and 700. Answer: (i) Photosynthesis is an enzymatic process. Splitting of water molecules releases oxygen as a by-product. 2. Question 8: Select the correct answer out of the available choices given under each question. Photosynthesis 7. Thylakoids. (True) 15. 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. (iii) What do you conclude from this experiment? In plant cells, carbohydrates are stored in which form (glucose, starch, glycogen). Thus we can say that oxygen liberated during photosynthesis comes from water. (b) Increases because more photosynthesis occurs. Question 2: Photosynthesis is considered as a process supporting all life on earth. A series of chemical reactions occur is quick succession initiated by light, therefore the phase is called photochemical phase. Organisms which cannot prepare their own food by photosynthesis. Answer: The splitting of water molecule into two component ions by light is known as photolysis of water. Chlorophyll 3. Hence, they are called as food factories of the plant. Pour iodine solution on it. If the answer is not available please wait for a while and a community member will probably answer this soon. Question: 1. Answer: (i) Chloroplast. A series of chemical reactions occur in quick succession initiated by light, therefore the phase is called photochemical phase. Optimum temperature required for photosynthesis is between 20 degree celsius to 25 degree celsius. (ii) Why was the plant placed in the dark before beginning the experiment ? Answer: (i) In the cell organelle called plastids (or chloroplasts). Photosynthesis utilizes carbon dioxide and water. Question 15: Why is it not possible to demonstrate respiration in a green plant kept in the sunlight ? (iv) Write a balanced chemical equation to represent the process of photosynthesis. ... explain the process of photosynthesis. Question 14: How is the rate of photosynthesis affected when a green plant gets green light ? What is the percentage of CO2 in air ? (iv) If ice cubes were added to the water, the rate of bubble formation would : (a) Remain the same. Because most biochemical reactions occur at a constant temperature and pressure. They are called so, because they provide the energy requirement for CO2 assimilation during dark reaction of photosynthesis. (Carbon-di-oxide) 4. Name the tissue which transports soluble products of photosynthesis in a plant. Justify your answer. (iv) Give a well balanced equation to represent the process. Light screen experiment, Complete the following sentences with appropriate words : 1. After the starch test, leaf Y would look like. Answer: 1. (ii) Explain the process. What does ATP abbreviated for ? Stroma 14. 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. NADPH2 8. (iii) The process that takes place first in the photolysis of water is H+ and OH- ions with the help of energy from sunlight. Question 10: How do non-green plants such as fungi and bacteria obtain their nourishment ? NADPH 5. Carbon dioxide is reduced to carbohydrate in the dark reaction. During this process, the solar energy is converted into chemical energy and carbohydrates are formed. The potted plant was then placed in sunlight for a few hours. 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. (e) Decreases because respiration decreases. Plastoquinone: A small molecule involved in electron and proton transfer in photosynthesis. Phosphorylation: The covalent attachment of a phosphate group to a molecule. (iii) To show that oxygen is given out during photosynthesis. 6. Which one of the following would not be a limiting factor for photosynthesis ? 6. Leave it in the sunlight. After the starch test, leaf X would look like. Answer: The chlorophyll traps solar energy and converts it into chemical energy. It is very poor in green light. Now keep the potted plant in light. (ii) No CO2 in the flask. (ii) It is positioned at a right angle to the light to get maximum light. Important protein complexes which carry out light reaction of photosynthesis are embedded in the membranes of the thylakoids. Answer: Take a destarched plant. Leaves are broad and flat to increase the surface area for photosynthesis. Calvin Cycle 3. (iii) What is the aim of the experiment? Test the leaf for starch with iodine solution. The unit of light absorbed by the chlorophyll during photosynthesis is the proton. But too much of its concentration proves to be toxic to the plants. All the starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of plant. Answer: This process produces food and releases oxygen, both of which are necessary to maintain life on earth. Green leaves are the main site of photosynthesis. The process of photosynthesis requires solar energy, water and carbon dioxide. Answer: (i) The object of this experiment is to show that CO2 is necessary for photosynthesis. This shows that the region which did not receive light could not synthesise starch. The leaf is boiled with alcohol over a water bath till it becomes colourless. Answer: i) SUNLIGHT Chlorophyll of the leaves of the plant trap sunlight and converts them into chemical energy during photosynthesis. Answer: (i) (f) (ii) (d) (iii) (e) (iv) (b) (v) (a) (vi) (c) (vii) (f) (viii) (a) (ix) (b) (x) (d) (xi) (e), ICSE Previous Year Question Papers Class 10, ICSE Solutions for Class 10 Biology – Photosynthesis, Concise Mathematics Class 10 ICSE Solutions, Concise Chemistry Class 10 ICSE Solutions, Concise Mathematics Class 9 ICSE Solutions, Violence in Video Games Essay | Essay on Violence in Video Games for Students and Children in English, Plus One Hindi Previous Year Question Paper March 2019, Schizophrenia Essay | Essay on Schizophrenia for Students and Children in English, Macbeth Ambition Essay | Essay on Macbeth Ambition for Students and Children in English, Compare and Contrast Hinduism and Buddhism Essay | Essay on Compare and Contrast Hinduism and Buddhism for Students and Children, Bill Clinton Impeachment Essay | Essay on Bill Clinton Impeachment for Students and Children in English, Marriage Essay | Essay on Marriage for Students and Children in English, Essay EBooks | EBooks Essay for Students and Children in English, Cultural Diversity Essay | Essay on Cultural Diversity for Students and Children in English, Letter from Birmingham Jail Essay | Essay on Letter from Birmingham Jail for Students and Children, Declaration of Independence Essay | Essay on Declaration of Independence for Students and Children in English. Question 1: What are the basic requirements of photosynthesis ? (ii) To remove all starch from the leaves of the plant. (iv) Leaf A will be yellowish-white. Answer: When a plant is kept in sunlight, CO2 released by respiration gets used by photosynthesis to synthesize food. Answer: 1. Then in the early hours of the morning she covered one of the leaves with black paper in the centre only. (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. The experiment showing that CO2 is necessary for photosynthesis. Day-length of plants is also an important factor for photosynthesis to be effective. What does light energy have to do with the process of photosynthesis? Question 6: Why green leaves are thin and broad ? 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. (False, Respiration occurs in all the cells of a plant.) It plays a vital role in the process of photosynthesis. Question 12: What is meant by photolysis of water ? During election transfer NADP get reduced and (rom NADP + H (NADPH2). Chlorophyll a and chlorophyll b are most prominent forms of chlorophyll found in plants. 5. Answer: (i) 3-5, (ii) Oxygen, (iii) Water, (iv) Decreases because the temperature drops, (v) Increases because photosynthesis increases. (iii) Light is necessary for photosynthesis. Chemical energy 5. Answer: (i) That light is necessary for photosynthesis. (i) What is the aim of the experiment ? Question 1. Life Processes Class 10 Important Questions Short Answer Type I. Each granum contains around 10-20 thylakoids. Answer: Chloroplast contains chlorophyll which is used to trap the solar energy from the sunlight which falls on the leaf. 6. 4. 8. Plastoquinone 6. (iii) During the starch test why was the leaf: (1) boiled in water (2) boiled in methylated spirit. 10. 2. Basic raw materials for photosynthesis Answer: (i) A large surface area to absorb water. A light reaction is a Photochemical reaction. Stomata (ii) One vein has been shown. The by-product of this process is oxygen. (ii) Oxygen. (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. Phosphorylation 9. Phloem 11. 14. Lets have a look at the process of photosynthesis and also explore its importance. (ii) The leaf portion which is not covered with black paper is the control as it receives sunlight. Answer: (i) To prove that CO2 is necessary for photosynthesis. 6. Free Energy 4. (Also known as the thylakoid membrane.) Photosynthesis 2. Stomata contains green pigment called chlorophyll. Solution: Biosynthetic phase of photosynthesis : • It occurs in the stroma of chloroplasts. Question 19: What is the law of limiting factor ? Formation of ATP in the chioroplast in the presence of light is called photophosphorylation. PhotoLysis is the reaction which means the breaking up of water molecules. Oxygen is given out by green plants. How many Chloroplasts can be found per square millimeter of leaf surface? The alphabet ‘A’ represents a certain condition inside the flask. Why are they called so ? (ii) It occurs in the grana of chloroplast. (v) If some sodium bicarbonate is added to the water the rate of bubble formation: (a) Increases because more respiration occurs. Adenosine Triphosphate 12. 2. What does Photosynthesis produce? (iii) CaO (limestone), potassium pyrogollate. These OH– react to liberate oxygen. Download Formulae Handbook For ICSE Class 9 and 10. The numeral ‘1’ represents a certain condition inside the flask and the numeral ‘2’ represents a chemical responsible for this condition. (True) 18. 6. Stroma of chloroplasts are the sites of these reactions. Question 3: Chlorophyll is necessary for photosynthesis. 4. It is green flattened sac like structure. Grana 6. From our childhood we are knowing about plants are autotrophs they synthesize their own food by the process of photosynthesis. (True) 7. Photosynthesis is a biological process utilized by all green plants to synthesize their own nutrients. CO2 is the life supporting gas produced due to photosynthesis. Six turns of Calvin cycle are required to generate one mole of glucose. 8. 9. (True). (ii) Non-green plants such as saprophytes and parasites use the food prepared by green plants during photosynthesis as a source of their own nutrition. (iii) Xylem – helps in the conduction of water. Answer the following: (i) What is the aim of this experiment? (ii) Now the potted plant is kept in light. (v) The leaf is then washed in water and tested with iodine. It takes place only in the cells containing chlorophyll. A variegated leaf (one that has green as well as white patches) will only photosynthesize in the green areas. Plants obtain water from the soil by the process of absorption performed by roots. Answer: Question 2: Stroma of chloroplast and Grana of chloroplast. (iii) Name the phenomenon which takes place in the above diagram. Form of energy which is converted into chemical energy during photosynthesis. 0.03-0.04% 6. (ii) Describe an experiment to show that light is necessary for photosynthesis. The Questions and Answers of Explain the process of photosynthesis? It was then set up as shown in the diagram and exposed to light for about 12 hours. Answer: (i) Chlorophyll is necessary for photosynthesis. (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. The leaf absorbs CO2 from the atmosphere through its stomatal openings. Thus they are dependent on photosynthesis. During this reaction, carbon dioxide and water are converted into glucose by chlorophyll in the presence of light energy. Answer: Blackman (1905) established the law of limiting factor in connection with photo-synthesis. (iv) Leaves are thin to allow rapid transport or diffusion of materials. Answer: During the process of photolysis under light reaction the water molecule split up to release H+ and OH– ions. (v) Give the chemical equation to represent the process of starch formation in plants. 9. (ii) It is the process in which green plants manufacture food from carbon-dioxide and water, in presence of sunlight. Question 2: (i) Identify the above diagram. 12. Each granum contains around 10-20 thylakoids. (ii) Name the chemical used for testing the presence of starch. Photosynthesis: It is the process by which green plants manufacture food by using carbon dioxide and water in the presence of sunlight. Answer: Respiration is a catabolic process while photosynthesis is an anabolic process. Write the functional activity of the following structures: 1. 4. Answer: Question 3: Chloroplast and Chlorophyll. 2. Photosynthesis results in loss of dry weight of the plant. Stroma. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’. The principal site in a green leaf for photosynthesis. (b) This energy is used in splitting the water molecules (photolysis) as below : H2O —-> H+ + OH– (c) OH– ions through a series of steps produce water (H2O) and oxygen (O2). Light intensity, water and alcohol before testing for the process by which plants light. Quantum. an experiment to destarch the leaves thin to allow rapid transport diffusion. With appropriate words: 1 respiration occurs in the membranes of the product photolysis... Process supporting all life on this earth the enzymes function within an range. 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