4. 0.03-0.04% 6. (iii) The process that takes place first in the photolysis of water is H+ and OH- ions with the help of energy from sunlight. (ii) It is the process in which green plants manufacture food from carbon-dioxide and water, in presence of sunlight. Answer: ATP and NADPH2 are called assimilatory power. Light Is Necessary For Photosynthesis Experiment Class 10 Introduction. Carbohydrates are produced by the process of carbon assimilation which is carried on by the combination of water, carbon dioxide, by the application of external energy, light, and chlorophyll along with the involvement of oxygen. Heterotrophs 7. All the starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of plant. Photosynthesis is a process by which plants prepare food. Grana, Thylakoid, Stroma, Root. Question 3: The figure given below represents an experiment to demonstrate a particular aspect of photosynthesis. 5. One of the leaves was then plucked and an outline of the leaf marking the green and the non-green regions was drawn. (v) The leaf is then washed in water and tested with iodine. Answer: Chloroplast contains chlorophyll which is used to trap the solar energy from the sunlight which falls on the leaf. 2. Question 28: List the events taking place in the photo-chemical phase of Photosynthesis. (iii) The plant is kept in the dark before the experiment to destarch the leaves. (ii) No CO2 in the flask. Answer: (i) That light is necessary for photosynthesis. Green coloured plastids are chloroplasts rich in chlorophyll pigment. (False, Transpiration occurs along with photosynthesis.) Plants obtain water from the soil by the process of absorption performed by roots. Answer: (i) Photosynthesis. The dark reaction of Photosynthesis is light independent. NADPH: Reduced form of nicotinamide ademne dinucleotide phosphate, a small water soluble molecule that acts as a hydrogen carrier in biochemical reactions. A light reaction is a Photochemical reaction. Chlorophyll  is responsible for trapping the energy from sunlight. Plants release oxygen as a waste product during photosynthesis. In plants what is the site of photosynthesis. 6. 2. How can it be destarched ? The raw materials for photosynthesis include water and CO2. 10. Leave it in the sunlight. Green leaves are the main site of photosynthesis. Starch 10. (ii) Identify the special condition inside the flask. (iii) Name an alternative chemical that can be used instead of KOH. Photosynthesis takes place in leaf cells. The part of the chloroplast where the dark reaction of photosynthesis takes place. (iv) Give an overall balanced chemical equation to represent the process named in (i) above. 11. So, iodine solution here turns the leaf blue. Phosphoglyceric acid is synthesised as the product. Each granum contains around 10-20 thylakoids. Answer: (i) To demonstrate that sunlight is necessary for photosynthesis. 2. (False, The unit of light absorbed by the chlorophyll during photosynthesis is the photon or quantum.) Basic raw materials for photosynthesis A plant that does not perform photosynthesis is Fungus. Photolysis 8. Question 9: Why is photosynthesis important in nature ? (e) Cannot tell from the information given. How can you explain respiration in a green plant that’s exposed to sunlight? Photosynthesis is a biological process utilized by all green plants to synthesize their own nutrients. Q4: Mention the conditions for photosynthesis. Chapter 6 Life Processes Class 10 Science Important Questions and Answers PDF will help you in scoring more marks. It is very poor in green light. Out of nine types of chlorophyll, chlorophyll ‘a’ and ‘b’ are most abundant. These OH– react to liberate oxygen. ATP 2. How many Chloroplasts can be found per square millimeter of leaf surface? Question 1: Draw a neat and well-labeled diagram of the Chloroplast. Test the leaf for starch with iodine solution. The processes performed by living organisms in order to maintain and continue life are called as life processes. Light intensity, Water content, Temperature, Chlorophyll. (Also known as the thylakoid membrane.) (ii) Why was the plant placed in the dark before beginning the experiment ? 2. Chloroplast 4. During the process of photosynthesis, plants capture light energy and use it to convert water, carbon dioxide, and minerals into oxygen and glucose. 1% of absorbed water is utilized and the remaining water is released during photosynthesis. Every question has been provided with a detailed explanation. Stroma 14. (iii) To show that oxygen is given out during photosynthesis. (False, Photosynthesis occurs in all green plants.) (ii) Iodine solution. 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. Glucose, Water, Oxygen, Carbon-dioxide. NCERT Class 10 Science Solutions. Which one of the following would not be a limiting factor for photosynthesis ? Photosynthesis: The process by which green plants prepare food is called photosynthesis. 230-250 molecules of chlorophyll make one quantasome. Cuticle 2. Light screen experiment, Complete the following sentences with appropriate words : 1. 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. • These reactions reduce the carbon dioxide into carbohydrates, making use of the ATP and NADPH 2 produced in the photochemical reactions. Question 21: On a bright sunny day water weeds growing in an aquarium were actively giving off bubbles of.gas. (i) What aspect of photosynthesis was being investigated ? This cycle is less efficient in utilising CO. Quality of the light also influences the rate of photosynthesis. 7. Water serves as a source for oxygen which is released as a by-product. During this reaction, carbon dioxide and water are converted into glucose by chlorophyll in the presence of light energy. (iv) Leaves are thin to allow rapid transport or diffusion of materials. (ii) Now the potted plant is kept in light. Explain. Land plants obtain their CO2 from atmosphere. Question 3: Chlorophyll is necessary for photosynthesis. (iv) The green parts of the leaf turned blue-black while non green parts turned brown. The chlorophyll on exposure to light energy becomes activated by absorbing photons. MY ACCOUNT LOG IN; Join Now | Member Log In. Stomata involves in this process. A dark reaction is a Thermochemical reaction. The apparatus was kept in sunlight for almost the whole day. Answer: (i) 3-5, (ii) Oxygen, (iii) Water, (iv) Decreases because the temperature drops, (v) Increases because photosynthesis increases. Six turns of Calvin cycle are required to generate one mole of glucose. (True) 16. Life processes include nutrition, respiration, circulation or transport, excretion, and reproduction. The unit of light absorbed by the chlorophyll during photosynthesis is the proton. Thylakoids. Calvin Cycle: The biochemical reactions, initiated by Rubisco, that result in the reduction of CO2 to a carbohydrate (also known as the photosynthetic carbon reduction cycle). 13. But too much of its concentration proves to be toxic to the plants. 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. Answer: (i) To prove that CO2 is necessary for photosynthesis. 11. (iii) What is the aim of the experiment? If so, state the same. Source of oxygen given out in photosynthesis. Plastoquinone 6. (Root) 2. The plant kept in bell without Potassium hydroxide can do photosynthesis and form starch. (iv) Write a balanced chemical equation to represent the process of photosynthesis. (i) Explain why the rate of photosynthesis in plants is low both at lower and higher temperatures. Photosynthesis is the physico-chemical process by which plants can convert light energy into chemical energy, in the form of carbohydrate from simple inorganic substances like atmospheric carbon dioxide and water. Question 6: The figure given below is for performing an experiment on photosynthesis. 2. Each granum contains around 10-20 thylakoids. (ii) Is there any control in this experiment ? What does NADP stand for ? Leaf B and Leaf C will turn blue-black. (v). Question 27: Write an experiment to demonstrate that CO2 is necessary for photosynthesis. Radiant energy 4. (ii) It is the process in which green plants manufacture food from carbon-dioxide and water, in presence of sunlight. Question 1. Question 2: (i) Identify the above diagram. (ii) The special condition inside the flask is that there is no CO2 in the air as it has been absorbed by the KOH. Leaves are considered to be the sites of photosynthesis. Pour iodine solution on it. (Photo = Light, lysis = Breaking). The complete chemical reaction is labelled as photosynthesis. Briefly explain the process of photosynthesis and include the equation. Name the tissue which transports water and mineral in a plant. 5. Which process is the ultimate source of energy for all living organisms ? (iii) Why was the plant kept in the dark before the experiment ? Leaf 2, will turn blue black at the end of starch test. In plant cells, carbohydrates are stored in which form (glucose, starch, glycogen). Also, mention the process involved in each of these steps. (ii) What is the function of sodium hydroxide solution in the flask? Calvin cycle was proposed by Melvin Calvin. 3. Question 23: Using the destarched plant describe step by step how would you proceed to prove that in the absence of light the leaf cannot manufacture starch ? She placed the potted plant in the sunlight for a few hours, and then tested the leaf which was covered with black paper for starch. Download Formulae Handbook For ICSE Class 9 and 10. (iii) CaO (limestone), potassium pyrogollate. Photosynthesis is important because it provides two main things: food; oxygen; Some of the glucose that plants produce during photosynthesis … Intensity of light also determines the rate of photosynthesis. Question 8: Which tissues and cells are mainly concerned with photosynthesis ? 11. Question 12: What is meant by photolysis of water ? The various processes resulting in the circulation of carbon in different forms constitute the carbon cycle. 8. 7. Name only one plant, you are familiar with which has no chlorophyll. 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. The specific function of light energy in the process of photosynthesis is to: (a) Reduce.carbon dioxide (b) Synthesize glucose (c) Activate chlorophyll (d) Split water, 3. 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. Name the process which is responsible for conversion of solar energy to chemical energy that is essential to sustain the life on this earth ? 8. PhotoLysis is the reaction which means the breaking up of water molecules. Increased concentration of carbon dioxide content enhances the rate of photosynthesis. 3. (ii) How many veins have been shown. 6. ATP: Adenosine triphosphate, a small water soluble molecule that acts as an energy currency in cells. 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 10: How do non-green plants such as fungi and bacteria obtain their nourishment ? Question 4: Chloroplasts are called energy converters. Answer: See figure. 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. Answer: 1. Phosphorylation: The covalent attachment of a phosphate group to a molecule. Thus they are dependent on photosynthesis. Life Processes Class 10 Important Questions Short Answer Type I. The thylakoids are arranged in stacks known as grana. Study the diagram and answer the questions that follow: (i) Why was the plant initially kept in darkness for 24 hours? Thus, light is necessary for photosynthesis. 7. ICSE Solutions for Class 10 Biology – Photosynthesis. Granum 2. (ii) To remove all starch from the leaves of the plant. Photosynthesis: The physical-chemical process by which certain chlorophyll (containing organisms use light energy for the biosynthesis of organic molecules. Splitting of water molecules releases oxygen as a by-product. Photosynthesis is the process of plants and trees. During respiration CO2 is given out while during photosynthesis O2 is given out. Ribulose bisphosphate is the primary acceptor of CO. Chloroplasts present are only of one type. (iii) Why is the leaf boiled in water and alcohol before testing for the presence of starch ? Now keep the potted plant in light. Essentiality of carbon dioxide is demonstrated by bell jar experiment. (ii) Name the membrane that connects thylakoid of one granum With the other granum. Calvin Cycle 3. What is the percentage of CO2 in air ? The purification of the atmosphere whereby the volume of CO2 remains fairly constant due to the photosynthetic activity of green plants. (d) Decreases because carbon dioxide acts as a limiting factor. 8. Using the above information, answer the following questions : (i) State the aim of the above experiment. The site of light reaction in the cell of a leaf. (False, It takes place in the presence of sunlight.) (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. Oxygen is used in respiration whereas it is given out as a by-product in photosynthesis. It is the process by which organisms can assimilate and utilise food for their basic needs. The main reaction which means the breaking up of water molecules through light. (iii) State the functions of part 4 and 5. 4. Photosynthesis is the process of converting the energy in which solar energy is converted into the … A high energy reduced compound formed in the light reaction and enter into the dark reaction. Question 14: How is the rate of photosynthesis affected when a green plant gets green light ? Photophosphorylation 11. 3. (True) 19. 9. Stroma of chloroplasts are the sites of these reactions. The portion covered with black paper remains colourless while rest of the leaf turn blue black. (2) Why would you select a destarched plant ? Mucus is secreted along with Hcl in the stomach . Question 19: What is the law of limiting factor ? (iii) What is the chemical substance numbered ‘2’? The leaf is boiled with alcohol over a water bath till it becomes colourless. (iv) Then the leaf is boiled in water for 2-3 minutes and then boiled in alcohol to remove the green chlorophyll. (Chlorophyll), 1. Hence, the guard cells become turgid and bulge outward due to their thin outer wall, thus widening the stomatal opening lying in between (Fig. (True) 8. One of the leaves was covered with black paper in the centre. Chlorophyll a and chlorophyll b are most prominent forms of chlorophyll found in plants. Stomata are the structures which help in the exchange of gases. 13. Answer: (i) Chlorophyll is necessary for photosynthesis. List the three events that occur during the process of photosynthesis. 14. Photosynthesis is an autotrophic mode of nutrition by plants and some bacteria. What does light energy have to do with the process of photosynthesis? Question 6: Respiration is said to be the reversal of photosynthesis. Explain why the rate of photosynthesis in plants is low both at lower and higher temperatures. Question 1. Carbon dioxide plays an important role in providing carbon for the process of photosynthesis. 9. So, during day time photosynthesis and stomatal transpiration occurs simultaneously. (iii) Leaf is boiled in water to kill the cells and boiled in alcohol to remove chlorophyll. Photosynthesis is the process by which plants make their own food using carbon dioxide, water and sunlight. Name the experiment to demonstrate the importance of light for photosynthesis. The hydroxyl ions combine to form hydrogen peroxide 2OH —> H2O2 which decompose to give molecular oxygen, i.e., 2H2O2 ——> 2H2O + O2 (iv). The leaf was then tested for starch. 2. Organisms which cannot prepare their own food by photosynthesis. (v) Give the chemical equation to represent the process of starch formation in plants. 10. Answer: (i) Photosynthesis. Question 13: Oxygen given out during photosynthesis comes from water. (iii) KOH or NaOH pellets. Justify your answer. The immediate product of photosynthesis. (iv) If ice cubes were added to the water, the rate of bubble formation would : (a) Remain the same. CO2 is the life supporting gas produced due to photosynthesis. (ii) Oxygen. Thus stomatal transpiration can take and CO2 can also enter the green leaf to enable photosynthesis to take place. (iv) Light supplies eiergy in the form of photons to split water during tight reaction. (c) Decreases because the temperature drops. It takes place only in the cells containing chlorophyll. 12. Hence, they are called as food factories of the plant. Answer: (i) A large surface area to absorb water. They are called so, because they provide the energy requirement for CO2 assimilation during dark reaction of photosynthesis. APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 5 Photosynthesis for ICSE Board Examinations. It occurs in following steps : Question 29: If you are planning an experiment to show the effect of light on photosynthesis : (1) Will you select white light or green light ? (ii) The leaf portion which is not covered with black paper is the control as it receives sunlight. Photosynthesis results in loss of dry weight of the plant. Why are they called so ? The enzymes function within an optimum range of temperature which is neither very low nor very high. 10. (True) 7. (v) If some sodium bicarbonate is added to the water the rate of bubble formation: (a) Increases because more respiration occurs. Find out how Melvin Calvin worked out the complete biosynthetic pathway for synthesis of sugar. The numeral ‘1’ represents a certain condition inside the flask and the numeral ‘2’ represents a chemical responsible for this condition. (ii) It occurs in the grana of chloroplast. Then in the early hours of the morning she covered one of the leaves with black paper in the centre only. If the answer is not available please wait for a while and a community member will probably answer this soon. (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. In this article you will get CBSE Class 10 Science chapter 6, Life Processes: NCERT Exemplar Problems and Solutions (Part-II). Answer: Question 3: Chloroplast and Chlorophyll. 3. Question 4: The figure below represents an experiment performed to demonstrate a particular aspect of photosynthesis. Chemical energy 5. Answer: During the process of photolysis under light reaction the water molecule split up to release H+ and OH– ions. Question 5: ATP is needed for dark reaction. Answer: When a plant is kept in sunlight, CO2 released by respiration gets used by photosynthesis to synthesize food. Question 1. Answer: The process of light reaction is completed in the grana region of chloroplast in the presence of sunlight. Thus we can say that oxygen liberated during photosynthesis comes from water. (iii) Briefly describe the reactions occurring in the leaves of the water weeds leading to the evolution of these bubbles. (2015) Answer: The process by which green plants make their own food (like glucose) from carbon dioxide and water by using solar energy in the presence of chlorophyll is called photosynthesis. The leaf turns blue all over except the region covered with black strips. Photosynthesis 2. Photosynthesis: 1. Formation of ATP in the chioroplast in the presence of light is called photophosphorylation. Answer: The basic requirements of photosynthesis are: Question 2: (i) Where are the chlorophyll pigments present in a cell. Xanthophyll is Yellow coloured pigment. (i) What is the aim of the experiment ? Explain how during light reaction of photosynthesis, ATP synthesis is a chemiosmotic phenomenon. 3. Answer: 1. (Carbon-di-oxide) 4. H2 ———> H+ + OH–. 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. Question 22: What is meant by destarched plant ? Anatomy of leaves does not resemble Kranz anatomy. Use this information to answer questions that follow : (i) Name the process occurring in the water weed that has resulted in evolution of these bubbles. A series of chemical reactions occur is quick succession initiated by light, therefore the phase is called photochemical phase. Question 17: Explain, why respiration is said to be a reversed process of photosynthesis ? Answer: The chlorophyll traps solar energy and converts it into chemical energy. Free Energy: The amount of energy in a reactions available to do work. 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. It takes place in chlorophyll containing thylakoids of chloroplast. The conversion of physical energy of light into chemical energy by the chloroplast is called Photophosphorylation. Answer: Question 2: Draw a neat and well-labeled diagram of the apparatus you would set up to show that oxygen is given out during photosynthesis. Photosynthesis occurs only in plants. What do you mean by sistolic and distolic pressure. 9. Answer: (i) Chloroplast. Mushroom 10. (iv) Describe step by step how the candidate proceeded to test the leaf for the presence of starch. Question 5: The figure below represents an experiment set up to study a physiological process in plants: (i) Name the physiological process being studied. The end products of photosynthesis are carbohydrates and oxygen. Plants contain chloroplast, which consists of green pigment chlorophyll, which traps the light energy and converts it into glucose, and releases oxygen and water. (ii) It is positioned at a right angle to the light to get maximum light. Water may be used inside the plant but O2 released into the atmosphere. Justify your answer. (i) From the graph it seems likely that the rate of bubbling per minute at 50 cm., would have been : (a) 2-0 (b) 2-5 (c) 3-0 (d) 3-5 (e) 4-0, (ii) The gas produced by the plant during the experiment was : (a) Air (b) Oxygen (c) Carbon dioxide (d) Nitrogen (e) Hydrogen, (iii) The gas collected comes due to the breakdown of: (a) Glucose (b) Starch (c) Water (d) Air (e) ATP. (v) Photosynthesis is the source of energy food and oxygen. Answer: (i) Photosynthesis is an enzymatic process. A variegated leaf (one that has green as well as white patches) will only photosynthesize in the green areas. Photosynthesis utilizes carbon dioxide and water. (ii) Name the chemical used for testing the presence of starch. Because most biochemical reactions occur at a constant temperature and pressure. Name the tissue that transports manufactured starch from the leaves to all parts of the plant. 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. 14. What are the differences between living and nonliving organisms? This shows that the region which did not receive light could not synthesise starch. Photosynthesis occurs in all the cells of a plant. Answer: Respiration is a catabolic process while photosynthesis is an anabolic process. (a) Oxygen (b) Light (c) Carbon dioxide (d) Chlorophyll, 4. (iv). The Questions and Answers of Explain the process of photosynthesis? (b) Why would you select a destarched plant ? Write the functional activity of the following structures: 1. Answer: The leaves of green plants are specially developed for the purpose of synthesizing food. (b) Increase because more water is added. Leaves are broad and flat to increase the surface area for photosynthesis. (True) 18. (iv) Define the phenomenon. Answer: (i) The object of this experiment is to show that CO2 is necessary for photosynthesis. (b) I will select destarched plant so I can demonstrate the synthesis of starch through iodine test. (False, Respiration occurs in all the cells of a plant.) 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. 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. 11. Xylem 5. Adenosine Triphosphate 12. (b) Increases because more photosynthesis occurs. 5. (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. RBSE Class 12 Biology Chapter 10 Essay Type Questions. (iv) Give a well balanced equation to represent the process. (ii) 1. Question 3: Give some adaptations in a green leaf for photosynthesis. Chlorophyll absorbs blue light effectively and then the red light, but proves to be a poor absorber of green light. Phosphorylation 9. It takes place is chlorophyll containing thylakoids of chloroplast. From our childhood we are knowing about plants are autotrophs they synthesize their own food by the process of photosynthesis. (iii) What do you conclude from this experiment? It is a process in which different types of plant and trees synthesize food with the help of sunlight to from carbon dioxide and water. (True). What is Photosynthesis in biology class 10? Photosynthesis: It is the process by which green plants manufacture food by using carbon dioxide and water in the presence of sunlight. 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. Column ‘II’ is a list of items related to ideas in Column ‘I’. (Photon) 3. Photosynthesis 7. Explain the process of biosynthetic phase of photosynthesis occurring in the chloroplasts. It occurs in following steps : (a) The chlorophyll on exposure to light energy becomes activated by absorbing photons. (i) It fakes place in the presence of light. The by-product of this process is oxygen. 10. Stomata (ii) One vein has been shown. (iii) After a few hours, the leaf is detached from the plant and the black strips are removed. Chlorophyll, Chlorophyll b, n-carotene, Photon. The process of photosynthesis requires solar energy, water and carbon dioxide. (iii) Light is necessary for photosynthesis. 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