(ii) How many veins have been shown. Intensity of light also determines the rate of photosynthesis. (ii) Identify the special condition inside the flask. These OH– react to liberate oxygen. 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). Stroma of chloroplasts are the sites of these reactions. Question 13: Oxygen given out during photosynthesis comes from water. Light in which maximum rate of photosynthesis takes place. MY ACCOUNT LOG IN; Join Now | Member Log In. Question 1. Justify your answer. The site of light reaction in the cell of a leaf. (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. During the process of photosynthesis, plants capture light energy and use it to convert water, carbon dioxide, and minerals into oxygen and glucose. • These reactions reduce the carbon dioxide into carbohydrates, making use of the ATP and NADPH 2 produced in the photochemical reactions. Answer: The tissues and cells which contain chloroplasts are mainly the palisade parenchyma and spongy mesophyll cells of a green leaf. Chloroplasts are regarded as complete photosynthetic units of plants. Land plants obtain their CO2 from atmosphere. Photosynthetic Membrane: A bilayer of lipid molecules in which are embedded proteins that transform light’energy into chemical free energy. Answer: Question 3: Chloroplast and Chlorophyll. It takes place only in the presence of light. Question 4: Chloroplasts are called energy converters. 10. 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. What do you mean by sistolic and distolic pressure. Photosynthesis results in loss of dry weight of the plant. 8. A light induced reaction which leads to splitting of water is Photolysis of water. (e) Cannot tell from the information given. After the starch test, leaf X would look like. The part of the chloroplast where the dark reaction of photosynthesis takes place. Oxygen is used in respiration whereas it is given out as a by-product in photosynthesis. (ii) Iodine solution. The leaf absorbs CO2 from the atmosphere through its stomatal openings. The process of photosynthesis takes place in the dark. Answer: (i) Photosynthesis. Question 21: On a bright sunny day water weeds growing in an aquarium were actively giving off bubbles of.gas. (v) Give the chemical equation to represent the process of starch formation in plants. 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. The main difference between chlorophyll ‘a’ and ‘b’ is: (a) Chlorophyll ‘a’ is a linear chain compound and ‘b’ is branched chain (b) Chlorophyll ‘a’ has no Mg ion in centre of molecule (c) In chlorophyll ‘a’ there is — CH3 group whereas in ‘b’ it is — CHO group (d) All of the above. Chapter 6 Life Processes Class 10 Science Important Questions and Answers PDF will help you in scoring more marks. Ribulose bisphosphate is the primary acceptor of CO. Chloroplasts present are only of one type. 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 ? What does ATP abbreviated for ? Water may be used inside the plant but O2 released into the atmosphere. Answer: Answer has not given due to out of present syllabus. Describe the process of light reaction of photosynthesis. 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. Plants contain chloroplast, which consists of green pigment chlorophyll, which traps the light energy and converts it into glucose, and releases oxygen and water. Splitting of water molecules releases oxygen as a by-product. (v) If some sodium bicarbonate is added to the water the rate of bubble formation: (a) Increases because more respiration occurs. 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. Hence, the guard cells become turgid and bulge outward due to their thin outer wall, thus widening the stomatal opening lying in between (Fig. This cycle is less efficient in utilising CO. Quality of the light also influences the rate of photosynthesis. Answer: ATP and NADPH2 are called assimilatory power. 3. Answer: 1. (ii) To remove all starch from the leaves of the plant. Light Is Necessary For Photosynthesis Experiment Class 10 Introduction. Name the experiment to demonstrate the importance of light for photosynthesis. 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. (iii) State the functions of part 4 and 5. The potted plant was kept in the dark for 24 hours. Plastoquinone 6. (i) What aspect of photosynthesis was being tested ? (i) What aspect of photosynthesis was being investigated ? A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to: (a) Remove starch from the plant (b) Ensure that starch is not translocated from the leaves (c) Remove chlorophyll from the leaf of the plant (d) Remove starch from the experimental leaf, 8. Answer: (i) A large surface area to absorb water. 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. NADPH2 8. 5. Generally, the rate of respiration is less than that of photosynthesis. Thus we can say that oxygen liberated during photosynthesis comes from water. Photosynthesis can also occur n artifidal light such as that of a 100 watt electric lamp. If the answer is not available please wait for a while and a community member will probably answer this soon. 2. After the starch test, leaf Y would look like. 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. Question 6: Why green leaves are thin and broad ? (False, Oxygen is the life supporting gas produced due to photosynthesis.) During respiration CO2 is given out while during photosynthesis O2 is given out. 3. 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. 7. Answer: The process of light reaction is completed in the grana region of chloroplast in the presence of sunlight. Leaves possess small pores called as stomata on both their surfaces. Answer: Photochemical phase of photosynthesis is light dependent. (a) Oxygen (b) Light (c) Carbon dioxide (d) Chlorophyll, 4. After a few hours pluck the leaf and remove the black strips. 4. It is the process by which organisms can assimilate and utilise food for their basic needs. Question 1: All life on earth Would come to an end if there were no green plants. Question 1: Light reaction and Dark reaction. (iii) KOH or NaOH pellets. Palisade tissue/chioroplast 4. Question 1: Draw a neat and well-labeled diagram of the Chloroplast. Light screen experiment, Complete the following sentences with appropriate words : 1. The leaf is boiled with alcohol over a water bath till it becomes colourless. A cell that lacks chioroplast does not: (a) Evolve carbon dioxide (b) Liberate oxygen (c) Require water (d) Utilize carbohydrates, 5. Question 15: Why is it not possible to demonstrate respiration in a green plant kept in the sunlight ? This energy is used during photolysis to split the water molecule into hydrogen and oxygen. Q4: Mention the conditions for photosynthesis. 8. (True) 8. (v) What is the importance of the above phenomenon ? Question 12: What is meant by photolysis of water ? APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 5 Photosynthesis for ICSE Board Examinations. 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. So no carbon dioxide is liberated, and respiration cannot be demonstrated. Find out how Melvin Calvin worked out the complete biosynthetic pathway for synthesis of sugar. In plants what is the site of photosynthesis. (ii) What is the special condition inside the flask ? This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Chemical Reactions and … One of the product of Photolysis of water is oxygen. Answer: (i) The object of this experiment is to show that CO2 is necessary for photosynthesis. (True) 3. (ii) Oxygen. 11. NADPH 5. Explain the process of biosynthetic phase of photosynthesis occurring in the chloroplasts. Chlorophyll, Chlorophyll b, n-carotene, Photon. equation of photosynthesis class 10 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. Upper Epidermis 3. (iv) Leaf 1, no change in colour with starch list. 5. (iii) Why was the plant kept in the dark before the experiment ? Question 14: How is the rate of photosynthesis affected when a green plant gets green light ? Source of oxygen given out in photosynthesis. Life processes Thus they are dependent on photosynthesis. Because most biochemical reactions occur at a constant temperature and pressure. (c) Decreases because the temperature drops. (True) 12. The plant kept in bell without Potassium hydroxide can do photosynthesis and form starch. A variegated leaf (one that has green as well as white patches) will only photosynthesize in the green areas. Question 10: How do non-green plants such as fungi and bacteria obtain their nourishment ? Answer: Take a destarched plant. Stomata (ii) One vein has been shown. [AI 2008] Answer: Phloem tissues. Green leaves are the main site of photosynthesis. RBSE Class 12 Biology Chapter 10 Essay Type Questions. Answer: ATP provides energy for dark reaction. 0.03-0.04% 6. Phosphorylation 9. List the three events that occur during the process of photosynthesis. (iv) What is the role of light in photosynthesis? The hydroxyl ions combine to form hydrogen peroxide 2OH —> H2O2 which decompose to give molecular oxygen, i.e., 2H2O2 ——> 2H2O + O2 (iv). Write the functional activity of the following structures: 1. (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. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’. Answer: (i) In a dark room a leaf on the destarched plant is covered on either side with strips of black paper which is kept in place by paper clips or cellophane tape. Phosphoglyceric acid is synthesised as the product. Grana 6. How many Chloroplasts can be found per square millimeter of leaf surface? The by-product of this process is oxygen. (iii) What is the aim of the experiment? 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