When light falls on plants they show light reaction. (a) pink Answer : Animals owe their existence to chlorophyll because plant with chlorophyll produces the food used by all the living organisms. Below, You will find a list of Biology MCQ Questions as per the latest prescribed syllabus. (d) absorption of light energy by chlorophyll. ... Get the free view of chapter 6 Photosynthesis Class 10 extra questions for ICSE Class 10 Biology and can use Shaalaa.com to keep it handy for your exam preparation. Question 2: Question 14 : Explain the term photolysis in photosynthesis. Аnswer: Class 10 Question 6: Question 18: reaction. During this stage, light energy is converted into chemical energy. Do not destarch the plant for more than 48 hours. Solution A.1. Light Reactions: These reactions occur in the presence of sunlight and they are responsible for the generation of energy molecules such as ATP and NADPH. Answer : The difference is given below. Carbon dioxide and water don't spontaneously convert into glucose and oxygen . NCERT Class 10 Science Solutions. (First compound is unstable, 6C keto acid) Question 12 : Name the cell organelle responsible for photosynthesis. The leaves were tested for starch, the leaf which showed no starch in it is (a) The dorsal surface of the leaf was white but the ventral surface turned blue. (a) the leaves absorb maximum blue light (b) Destarching helps in removing the starch from the leaf. 2. Question 17 : Mention any three adaptations found in plants to favour the process of photosynthesis. The steps, necessary for setting up the experiment “To demonstrate that light is necessary for photosynthesis” are not given here in proper sequence. (d) the leaf covered with any of the above strips. (a) extract starch A typical plant cell may contain about 10 to 100 chloroplasts. Question 3: Solution A.2. Optimum temperature for photosynthesis is about 25 o C. About 35 o C - 45 o C. 9. (a) 400-700 (b) 760-10,000 (c) 100-390 (d) 390-430 (a) 400-700 (b) As starch test is colour change test, hence coloured pigment chlorophyll needs to be removed. To make food, plants need CO. Plants can prepare their food in blue light. The starch test is done on the leaf after 8 hours of exposure to light. The process of conversion of ADP to ATP during the first phase of photosynthesis. Stoma and stroma. Light Is Necessary For Photosynthesis Experiment Class 10 Introduction. Photosynthesis is the process by which autotrophic plants make their own food.Co2, water, chlorophyll, and sunlight are four important requirements for this process. After destarching, we keep the plant in the bright sunlight so that it undergoes photosynthesis to produce starch. If the intensity of light increases the rate of photosynthesis also increases. Question 6: Photosynthesis is an endothermic. (a) absorption of sunlight Questions based on Observational Skills (d) hydrochloric acid. Light reactions need light to produce organic energy molecules (ATP and NADPH).They are initiated by colored pigments, mainly green colored chlorophylls. Question 18 : Write true or false. Photosynthesis: The process by which green plants prepare food is called photosynthesis. (c) activate chloroplasts Oxygen is the by-product released during photosynthesis. Аnswer: Animals owe their existence to chlorophyll. Question 19 : Rewrite the completed explanation by inserting a key word in the space indicated by ‘^’. There are many instances when bright students miss golden opportunities because of lack of proper guidance and are not able to perform optimally despite deep interest and willingness to work hard. The inference is that Why should we always use water bath while boiling the leaf in alcohol solution? Class-10 » Science. Question 21 : Account for the given below briefly. Understand that ENERGY can be transformed from one form to another. Call our LearnNext Expert on … (a) Boil the destarched leaf in lime water. A part of a destarched leaf of a potted plant was covered with black paper strips on both sides and the plant was kept in sunlight for 8 hours. Equation 6 CO 2 + 6 H 2 O → C 6 H 12 O 6 + 6 O 2 (b) Both the surfaces of the leaf were white. Photolysis Photophosphorylation It is a process of splitting of water molecule into 2H+ + 4e- + 1/2 O2 in the … Chapter 5 Periodic Classification of Elements. (describe its structure). (c) Starch test is iodine solution changes blue-black with starch. III. Question 3 : Differentiate between the following pair on the basis of what is mentioned in bracket? Looking forward to pursuing higher education or a career in science? Question 9: (d) black. (ii) Quantum requirement in photosynthesis = 8, i.e., 8 quanta of light are required to … The process begins in the daylight, by gathering the light. (d) Light is necessary for photosynthesis of starch in green plants. In plants, photosynthesis typically occurs within the chloroplasts located in plant leaves. “light is necessary for photosynthesis”, four students reported the inference as follows. A potted plant is kept in different coloured lights. Dec 26, 2020 - CBSE Class 10 - Science - CH6 Life Processes (Photosynthesis) Photosynthesis Class 10 Notes | EduRev is made by best teachers of Class 10. Question 16 : Name the ground substance present in a chloroplast. Photosynthesis is usually represented by the equation 6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2. keep the potted plant in darkness for about 48 hours Answer : i) Presence of more stomata to allow rapid exchange of gases like CO2 and O2. Аnswer: Why do we warm the leaves in alcohol? 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(grana, cytoplasm, stroma). Аnswer: Answer : Sleeping under tree at night is not advisable because plants respire at night due to which the atmosphere surrounding the tree is rich in CO2 which is harmful to us. Plants can prepare their food best in blue light. Know that energy exist in two forms; free energy - available for doing work or as heat - … (d) convert light energy into chemical energy. Two main phases are involved in the mechanism of photosynthesis:light dependent phase and light independent phase. Carbon dioxide, water and light are all needed for photosynthesis to take place. Question 2: Answer : Chloroplasts are mainly found in the mesophyll cells located between the upper and lower epidermis of the leaves. The figure that correctly depicts the removal of chlorophyll is: Question 14: NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations includes all the important topics with detailed explanation that aims to help students to understand the concepts better. (b) I, IV, III, II Аnswer: This is possible only when you have the best CBSE Class 10 Science study material and a smart preparation plan. There is a possibility of translocation of food from uncovered leaf to a covered part of leaf. It takes place in the thylakoid membranes of the chloroplast and includes photosynthetic pigments arranged into two light-harvesting complexes within photo system I … Give reasons. 10. In chloroplast. ICSE Solutions for Class 10 Biology – Photosynthesis. Following is the photosynthesis formula: Question 17: When partially covered leaf is treated with iodine solution then the covered portion do not turn blue-black on adding iodine solution whereas the uncovered portion which received the light turns blue-black due to synthesis of starch in them. The leaf was then tested with iodine after boiling it in a alcohol. Unlike many other endothermic reactions, photosynthesis does not absorb energy as heat. (d) The light energy is absorbed to initiate the reaction. Given below is a sketch of a leaf partially covered with black paper and which is to be used in the experiment to show that light is compulsory for the process of photosynthesis. Rice, wheat, bean, potato. Calvin presented these reactions in cyclic manner & thus called as Calvin cycle. and students can understand these concepts in a better way through ch 1 Science Class 10 … CHLOROPLAST. (c) intake of C02 at night Questions based on Procedural and Manipulative Skills Dark reaction : Dark reaction occurs in the stroma of the chloroplast. Question 9 : Give one point of difference between the following on the basis of what is given in the bracket? (c) (ii), (iii), (iv), (i) The general balanced reaction for Photosynthesis Formula according to Kamen and Ruban (1941) is … Class-10CBSE Board - Photosynthesis - LearnNext offers animated video lessons with neatly explained examples, Study Material, FREE NCERT Solutions, Exercises and Tests. (b) photolysis of water (c) C (iii) attaching black paper strips to the leaf; (Light Reaction) Reduction of carbon dioxide to carbohydrates. Then do the same steps (4-11) as in procedure 1 on previous page. We, at Vedantu, have analyzed th… The best result of the experiment that light is necessary for photosynthesis would be yielded by using leaves from a plant kept for over twenty four hours: Function : The function of thylakoid is to trap the light energy and to transform this energy into chemical energy forms, i.e. (d) make membrane of leaf cells more permeable. Question 3: (a) convert light energy into chemical energy During their conversion, oxygen is produced, and water is used. Photosynthesis. Carefully place this beaker in water bath and heat it till the alcohol begins to boil. (i) Rate or yield of photosynthesis is measured in terms of quantum yield or O 2 evolution, which may be defined as, "Number of O 2 molecules evolved per quantum of light absorbed in photosynthesis." (d) Green plants can prepare starch by  photosynthesis. Download Apps and Solutions based on latest NCERT Books and current CBSE Syllabus 2020-21. On completion of the experiment to demonstrate that Dark reaction is light-independent reaction. (b) alcohol Photosynthesis is a process by which plants prepare food. The following events occur during the process of photosynthesis: The above step may not occur simultaneously in some plants. Photosynthesis PPT FOR CLASS 9,10 and 11Th students 1. Dark Reactions: These reactions do not need sunlight and occur in its absence. When leaf is boiled with ethanol and treated with iodine solution, its colour changes into: The variable we are testing here is light that affects photosynthesis and the product formed is starch. Answer : Photolysis in photosynthesis is the splitting of water molecules into hydrogen ions and hydroxyl ions in the presence of chlorophyll and light. Wash the alcohol from the leaves and then do the iodine test. E.g. (c) Boil the destarched leaf in water only. (a) in a pitch dark room Candidates who are ambitious to qualify the Class 10 with good score can check this article for Notes. The removal of all the starch present in plant is called de-starching. (a) C02 is necessary for photosynthesis What Are the Products of Photosynthesis? Choose a leaf and clip it carefully so that it does not break or crack from the stem. In the presence of light, photolysis reaction takes place in a plant. The Electron Transport. … (c) outside in the garden It indicates that no starch was made by this leaf. Photorespiration Photosynthesis is divided broadly into two main steps. The correct statement is respiration occurs  in all the cells of the plant. CBSE Class 10 Science Practical Skills – Light is Necessary for Photosynthesis. The reaction requires energy in the form of light to overcome the activation energy needed for the reaction to proceed. The correct statement is : Plants that manufacture their own food are called autotrophs. (c) KOH solution Dark reaction of photosynthesis is independent of light and occurs simultaneously with light reaction. Dark reactions use the energy molecules that were generated during the light reactions. Select a small healthy, herbaceous potted plant. done clear. Light Reactions: These reactions occur in the presence of sunlight and they are responsible for the generation of energy molecules such as ATP and NADPH. Photosynthesis occurs in two steps: Light reaction and Dark Reaction. Plants store the food in roots, stems and this stored food is used/transported by plant to all the parts wherever the food is required. This phase occurs in the thylakoids … Available for CBSE, ICSE and State Board syllabus. (b) Blue light is better absorbed among the other given lights (red is the best). What is meant by de-starching? Arrange the following steps in correct sequence: Question 7 : Differentiate between the following pair on the basis of what is mentioned in the bracket. It will catch fire if we heat the beaker containing alcohol directly on the flames of burner. Аnswer: (B) Dark Reaction: Blackman reaction is called as dark reaction, because no direct light is required for this. In this light reaction the water in leaves undergo photolysis. What are the raw materials required by plants for photosynthesis? Answer : Chloroplasts are mainly found in the mesophyll cells located between the upper and lower epidermis of the leaves. Get a free home demo of LearnNext . Revise important photosynthesis-based questions by watching our interactive exam decoded videos by Biology experts. Question 13: (a) A Dark Reactions: These reactions do not need sunlight and occur in its absence. The best rate of photosynthesis is seen in Photolysis and photophosphorylation. 1 Mark Questions Answer : Photophosphorylation is the process of conversion of ADP into ATP during photosynthesis. The site of light reaction in the cells of a leaf is …………. To take bigger steps in life, you also need to rely on a good academic record. (ii) treatment with iodine; Test , Class 10, Chemistry, CBSE- Chemical Reactions and Equations. (a) I, III, IV, II Photosynthesis reaction involves two reactants, carbon dioxide and water. Our notes of Chapter 1 Chemical reactions and equations are prepared by Science experts in an easy to remember format, covering all syllabus of CBSE, KVPY, NTSE, Olympiads, NCERT & other Competitive Exams. Observe the colour of the leaves and solution. Why do we need to decolourise the leaf? In photolysis reaction, the water decomposes to form hydrogen and oxygen gas. Question 2 : State the exact location of the chloroplast. Photosynthesis ICSE Class-10 Concise Selina Biology Solutions Chapter-6. Give reason. Question 1: This step is carried out to Answer : Light reaction  of photosynthesis takes place in the grana/thylakoids of the chloroplast. For the experiment that, “light is necessary for photosynthesis” the potted plant is first kept in darkness for a day. Dip the leaves in boiling water for a few minutes. The complete chemical reaction is labelled as photosynthesis. What photosynthesis accomplishes, why it's important, and how the light-dependent and light-independent reactions work together. Answer : Nicotinamide Adenine Dinucleotide Phosphate is the full form of NADP. Aug 13, 2018 - ICSE Solutions for Class 10 Biology – Photosynthesis ICSE SolutionsSelina ICSE Solutions APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 5 Photosynthesis for ICSE Board Examinations. Answer : The function of thylakoid is to trap the light energy and to transform this energy into chemical energy forms, i.e. 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. Advertisement Remove all ads. To prevent such accidents, it is always advised to use water bath. (d) I and III parts of leaf gets light and hence starch is made but II part gets no light. Respiration Experiment Class 10 Introduction. Yes, plants can prepare their food in any light i.e.-tube light, bulb-light, sunlight. A. Answer : Chloroplast is the cytoplasmic organelle that help in the manufacture of glucose and starch. (b) blue Photosynthesis is the process in plants and certain other organisms that uses the energy from the sun to convert carbon dioxide and water into glucose (a sugar) and oxygen. (b) blue light Question 25 : Give the exact location and one function of thylakoids. On adding iodine solution to covered leaf no colour change was observed. During this reaction, carbon dioxide and water are converted into glucose by chlorophyll in the presence of light energy. (b) True (c) False In order to achieve that, interest and hard work alone wont be enough to work it out. Now immerse the leaves in a beaker containing alcohol. c) Nicotinamide Adenine Dinucleolus Phosphate. Brown. A potted plant was kept in dark room for 3 days and then 4 leaves were covered with different coloured papers as shown below. Boiling of leaf in alcohol: The leaf to be tested for presence of starch is boiled in alcohol to remove the pigment chlorophyll otherwise it will interfere with the starch test. (c) the blue light has maximum wavelength Write true or false. In which part of the plant the photolysis reaction initiates? Question 4: Question 10 : Give the biological/technical term for the process of conversion of several molecules of glucose to one molecule of starch. During photosynthesis plants prepare starch. Understand the concept clearly by consistently practicing the Multiple Choice Questions and score well in your exams. Alcohol is not heated directly over the flame because it will evaporate quickly without being much in contact with the leaves. (i) de-starching the plant; It is essential because: (a) I only Iodine solution becomes blue-black in presence of starch. The dark reaction of Photosynthesis is light independent. 1 Mark Questions Answer : Photophosphorylation is the process of conversion of ADP into ATP during photosynthesis. (d) alcohol is flammable. Check important chemical reactions for CBSE Class 10 Science exam 2020-21 & resources, sample paper, preparation tips to score decent marks in CBSE Science paper 2020-21 (adsbygoogle = window.adsbygoogle || []).push({}); Question 1 : Name the process of conversion of ADP into ATP during photosynthesis. II. Which range of wavelength (in nm) is called photosynthetically active radiation (PAR)? Photosynthesis is a chemical reaction that takes place inside a plant, producing food for the plant to survive. Photosynthesis is a process by which plants prepare food. It is a process of formation of ATP from ADP and inorganic phosphate by the utilisation of energy released by electrons emitted during photolysis of water. Pluck two leaves from the plant, one that is covered and the other one that is uncovered. Аnswer: Saturday, July 15, 2017. (b) glucose formed in photosynthesis soon gets converted into starch. Photosynthesis is the process by which autotrophic plants make their own food.Co2, water, chlorophyll, and sunlight are four important requirements for this process. Step by step Solutions for ICSE Biology Class 10 Science study material and a smart preparation plan alcohol on... Chlorophyll and light are all needed for the process by which green plants can prepare their by. By which green plants and certain other organisms transform light energy is converted to chemical energy and to this. Equations – get here the Notes for Class 10 students and has been 19804... 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