The alcohol is highly inflammable solution. Question 4: Light-dependent phase is also known as the Hill reaction or photochemical reaction. The correct order is: It is essential because: Question 18 : Write true or false. Stroma is the part/region in the chloroplast (matrix), where dark reaction of the photosynthesis takes place. The process of conversion of ADP to ATP during the first phase of photosynthesis. To see the iodine colour change with starch. The complete chemical reaction is labelled as photosynthesis. Green leaves are the main site of photosynthesis. (a) deactivate the chloroplast 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. (c) photolysis of water Stoma and stroma. In this page, you can find CBSE Class 10 Science Chapter 6 Extra Questions and Answers Life Processes Pdf free download, NCERT Extra Questions for Class 10 Science will make your practice complete. Identify the correct inference. Asked by avinashdesaiad10 21st May 2019 2:15 PM In this light reaction the water in leaves undergo photolysis. Low CO 2 compensation point (0-10 m l. CO 2 l-1). Аnswer: 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: Photosynthesis takes place in leaf cells. Following is the photosynthesis formula: Give reasons. (grana, cytoplasm, stroma). (a) C02 is necessary for photosynthesis Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. (b) in a dark room with table lamp switched on Photosynthesis occurs in all the cells of the plant. At the end of the experiment, which one of the leaf parts labelled I, II and III will become blue-black when dipped in iodine solution? (c) the leaf covered with green strip What is the use of light in photosynthesis? The correct statement is : Plants that manufacture their own food are called autotrophs. For example, desert plant take up CO. Destarching: When a plant is kept in darkness for about forty eight hours all the carbohydrates made and stored by the plants are utilised for providing energy to the plants. Which range of wavelength (in nm) is called photosynthetically active radiation (PAR)? Question 8 : Name the part of the chloroplast where the light reaction of photosynthesis takes place. When the leaf is covered, it is not allowed to take sunlight and hence, no starch was prepared in the leaf. IV. Observe the colour of the leaves and solution. (b) The covered part of leaf will not have starch and will not show colour change. Download Apps and Solutions based on latest NCERT Books and current CBSE Syllabus 2020-21. (a) green light 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. Revise the different types of nutrition in plants using TopperLearning’s ICSE Class 10 Biology concept videos, Selina solutions and other learning materials. Overall reaction of photosynthesis Light Energy 6CO 2 + 12H 2 O Chlorophyll → C 6 H 12 O 6 + 6O 2 + 6H 2 O Photosynthesis involves two types of reactions namely, light reactions and dark reactions. Photolysis Photophosphorylation It is a process of splitting of water molecule into 2H+ + 4e- + 1/2 O2 in the … Photosynthesis is usually represented by the equation 6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2. Select a healthy leaf and clip a portion of it with dark colour paper using clips. Dark Reactions: These reactions do not need sunlight and occur in its absence. The correct statement is respiration occurs  in all the cells of the plant. Equation 6 CO 2 + 6 H 2 O → C 6 H 12 O 6 + 6 O 2 Plants need light, carbon dioxide, water and chlorophyll pigments in leaf for photosynthesis. (True) 16. Exercise 1. Question 7: Question 9 : Give one point of difference between the following on the basis of what is given in the bracket? (d) convert light energy into chemical energy. (c) Starch test is iodine solution changes blue-black with 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. During this reaction, carbon dioxide and water are converted into glucose by chlorophyll in the presence of light energy. Photolysis is the splitting of water molecules into hydrogen ions and hydroxyl ions present in the presence of ‘^’ and light. Class-10 » Science. By the end of this lecture you will be able to: 1. Will you get the same result if you perform the experiment without de-starching the plant? Dip the leaves in boiling water for a few minutes. The steps, necessary for setting up the experiment “To demonstrate that light is necessary for photosynthesis” are not given here in proper sequence. Chloroplast is the cell organelle where photosynthesis takes place in plants and algae. These two reactants yield two products, namely, oxygen and glucose. Answer : Chloroplast is the cell organelle responsible for the photosynthesis. (a) the leaves covered with red, green and blue strips (d) I and III only. Know that energy exist in two forms; free energy - available for doing work or as heat - … (iv) keeping the set-up in sunlight; The reaction requires energy in the form of light to overcome the activation energy needed for the reaction to proceed. Optimum temperature for photosynthesis is about 25 o C. About 35 o C - 45 o C. 9. What photosynthesis accomplishes, why it's important, and how the light-dependent and light-independent reactions work together. (a) Part of the leaf covered with strip can only undergo photosynthesis Аnswer: A student performed the starch test on a leaf, some steps involved are shown below: Keep this plant in sunlight for about six hours. Question 5: Select a small healthy, herbaceous potted plant. Advertisement Remove all ads. Understand that ENERGY can be transformed from one form to another. In which part of the plant the photolysis reaction initiates? (b) I, IV, III, II Photosynthesis is the process by which autotrophic plants make their own food.Co2, water, chlorophyll, and sunlight are four important requirements for this process. 2. Class 10 Science Chemical Reactions and Equations – Get here the Notes for Class 10 Science Chemical Reactions and Equations. Аnswer: A. In an experiment to show that sunlight is necessary for photosynthesis, the leaf is boiled in alcohol for a few minutes using a water bath. “light is necessary for photosynthesis”, four students reported the inference as follows. (a) water (d) Water bath prevents the direct heating of alcohol which is highly inflammable and can catch fire. Question 6 : State the main function of thylakoids. (a) I only (d) The light energy is absorbed to initiate the reaction. Question 6: Question 24 : Give reason-Green leaves are thin and broad. Also, mention the process involved in each of these steps. Revise important photosynthesis-based questions by watching our interactive exam decoded videos by Biology experts. Photosynthesis is a process by which plants prepare food. keep the potted plant in darkness for about 48 hours (False, It remains stored in it for 24 to 48 hours) (c) chlorophyll is necessary for photosynthesis Photosynthesis (Greek word photos: light; synthesis-, putting together) is the process by which the green plants synthesise their own food (glucose) using carbon dioxide and water as raw materials in presence of sunlight and chlorophyll. Glucose is further converted into starch. Now observe the colour of leaves and compare them. Then do the same steps (4-11) as in procedure 1 on previous page. (First compound is unstable, 6C keto acid) Respiration Experiment Class 10 Introduction. (a) Boil the destarched leaf in lime water. reaction. Answer : The given statement is false. In a plant if there are no leaves for a short period of time, i.e.,-Autumn, how do such plants survive? Important Questions on Chemical Reactions and Equations and previous years questions are also available to use free. (definition). We don't find any important chemical reaction in this … It takes place in the thylakoid membranes of the chloroplast and includes photosynthetic pigments arranged into two light-harvesting complexes within photo system I … Question 3: If the starch is already present in the plant, the experiment will not give the fair test. (c) outside in the garden Question 16: To take bigger steps in life, you also need to rely on a good academic record. And then it spits out this juicy carbohydrate molecules. Dark reaction of photosynthesis is independent of light and occurs simultaneously with light reaction. Class 10 Science Chapter 1 Chemical Reactions and Equations Notes of Chemistry are given below updated for new academic session 2020-21. What is the right procedure to remove chlorophyll from a destarched leaf? Chemical Equation Of Photosynthesis Class 10 Answer: i) SUNLIGHT Chlorophyll of the leaves of the plant trap sunlight and converts them into chemical energy during photosynthesis. Аnswer: Plants that manufacture their own food are called heterotrophs. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds. Class-10CBSE Board - Photosynthesis - LearnNext offers animated video lessons with neatly explained examples, Study Material, FREE NCERT Solutions, Exercises and Tests. (a) in a pitch dark room Know that energy exist in two forms; free energy - available for doing work or as heat - … Wash the alcohol from the leaves and then do the iodine test. Question 12: What are the raw materials required by plants for photosynthesis? Light-dependent reactions (light reactions) 2. Question 6: On adding iodine solution to covered leaf no colour change was observed. (b) Alcohol helps in dissolving the chlorophyll without affecting the other cells. LIGHT REACTION (PHOTOCHEMICAL PHASE) Light reactions include light absorption, water splitting, oxygen release and formation of ATP & NADPH (high-energy chemical intermediates). This process is called destarching. (c) Photosynthesis takes place only in the presence of sunlight Question 17 : Mention any three adaptations found in plants to favour the process of photosynthesis. … (d) yellow light. Question 8: (c) the blue light has maximum wavelength b) glucose formed in photosynthesis soon gets converted into starch. What is meant by de-starching? (a) the leaves absorb maximum blue light Why do we boil the leaves in alcohol solution? What is the original colour of iodine solution? (d) (i), (iii), (iv), (ii). Answer : Green leaves are thin and broad so as to provide the large surface area for trapping light and easy gaseous exchange for photosynthesis to occur. Answer : Chloroplast is the cytoplasmic organelle that help in the manufacture of glucose and starch. Photosynthesis consists of two stages, the light reactions, and the dark reactions. Photosynthesis PPT FOR CLASS 9,10 and 11Th students 1. Light reaction and dark reaction. Question 9: (b) (i), (ii), (iii), (iv) (b) True (c) False Answer : Nicotinamide Adenine Dinucleotide Phosphate is the full form of NADP. Carbon dioxide and water don't spontaneously convert into glucose and oxygen . 2. Photolysis and photophosphorylation. The best rate of photosynthesis is seen in Light Is Necessary For Photosynthesis Experiment Class 10 Introduction. 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 figure that correctly depicts the removal of chlorophyll is: Question 14: During this reaction, carbon dioxide and water are converted into glucose by chlorophyll in the presence of light energy. done clear. (d) I and III parts of leaf gets light and hence starch is made but II part gets no light. Question 18: Carefully place this beaker in water bath and heat it till the alcohol begins to boil. Photorespiration Photosynthesis is divided broadly into two main steps. (d) hydrochloric acid. Question 1: (Dark Reaction by Calvin Cycle) Q4: Mention the conditions for photosynthesis. II. Answer : Photophosphorylation is the process of conversion of ADP into ATP during photosynthesis. Question 2 : State the exact location of the chloroplast. Class 10 Science Chapter 1 Revision Notes PDF Download. Answer : Chloroplasts are mainly found in the mesophyll cells located between the upper and lower epidermis of the leaves. (c) steam from water bath dissolves the chlorophyll (adsbygoogle = window.adsbygoogle || []).push({}); Question 1 : Name the process of conversion of ADP into ATP during photosynthesis. III. (Light Reaction) Reduction of carbon dioxide to carbohydrates. (ii) Quantum requirement in photosynthesis = 8, i.e., 8 quanta of light are required to … This proves that sunlight is required for photosynthesis. (b) dissolve chlorophyll Plants absorb water through their roots, and carbon dioxide through their leaves. The starch test is done on the leaf after 8 hours of exposure to light. Starch test: On adding iodine solution to the starch, it forms starch-iodine complex which is blue-black in colour. Question 14 : Explain the term photolysis in photosynthesis. The correct sequence of steps should be: Answer : The given statement is false. Question 1: (d) absorption of light energy by chlorophyll. Pluck two leaves from the plant, one that is covered and the other one that is uncovered. 10. Plants can prepare their food best in blue light. The two types of photosystems convert light energy into ATP and NADPH. Instead, during plants absorb energy from sunlight to turn carbon dioxide and water into oxygen and glucose, which is a type of sugar molecule. (d) The blue light is absorbed the best by chloroplast. In desert plants, the first step of photosynthesis can be Answer : i) Presence of more stomata to allow rapid exchange of gases like CO2 and O2. If the intensity of light increases the rate of photosynthesis also increases. Question 2: Candidates who are ambitious to qualify the Class 10 with good score can check this article for Notes. Аnswer: Available for CBSE, ICSE and State Board syllabus. (a) A 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. The removal of all the starch present in plant is called de-starching. PHOTOSYNTHESIS. (d) prepare leaves for photosynthesis. The best rate of photosynthesis is in blue light because: Question 19: (a) 400-700 (b) 760-10,000 (c) 100-390 (d) 390-430 (a) 400-700 What is Photosynthesis in biology class 10? Question 1: At the time of solving the NCERT questions, if you find yourself puzzled or unaware of … Question 16 : Name the ground substance present in a chloroplast. If false, write the correct form of the statement by changing the first or last word only. (b) Light is must for photosynthesis as it initiates the reaction in cells. Question 6: The above experiment can be done by covering a portion of leaf with black paper. Question 21 : Account for the given below briefly. Question 12 : Name the cell organelle responsible for photosynthesis. Answer : Location : Thylakoids are found in chloroplast. Yes, plants can prepare their food in any light i.e.-tube light, bulb-light, sunlight. Question 7 : Differentiate between the following pair on the basis of what is mentioned in the bracket. To show experimentally that light is necessary for photosynthesis. Class 11 Biology NCERT Chapter: Photosynthesis in Higher Plants. ATP and NADPH to be used in dark reaction. Class 10 Chapter 1 Chemical Reactions and Equations describe the various processes that happen around us in the World like Rusting of Iron, Decomposition, etc. Understand that ENERGY can be transformed from one form to another. (c) Covering the dorsal side of leaf will not deprive it from light. Developed by Amrita University Under research grant from Department Of Electronics & Information Technology (b) the steam from water bath heats the leaf rapidly ICSE Class 10 Chapter Biology Chapter 6 Photosynthesis Revision Notes . 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. Iodine solution becomes blue-black in presence of starch. Theory, Materials Required Question 11 : Why is sleeping under a tree at night not advisable? Now immerse the leaves in a beaker containing alcohol. (b) Boil the destarched leaf in alcohol. The dark reaction of Photosynthesis is light independent. Photosynthetically more efficient and productivity high. When leaves are boiled in alcohol, the alcohol solution becomes green and the leaves become colourless. Question 20: Why do plants get de-starched when kept in continuous darkness for about forty eight hours? (a) convert light energy into chemical energy (a) extract starch Hence, the photosynthesis reaction is considered to be an endothermic reaction. A) It is an endothermic reaction. Question 4 : Expand the following biological abbreviation – NADP. Questions based on Observational Skills Call our LearnNext Expert on … (i) de-starching the plant; Dark reaction is light-independent reaction. (a) This helps in de-starching the leaves. It is therefore important to heat the test tube containing alcohol and leaves in water bath. Alcohol helps in the removal of colour pigment chlorophyll from the leaf which may otherwise interfere in the starch test, as starch test is the colour change test. Can this experiment be performed with a de-starched leaf detached from the plant? Light reactions take place during the first stage of photosynthesis. 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 is an endothermic. This document is highly rated by Class 10 students and has been viewed 19804 times. (a) I, III, IV, II Before carrying out the test for the presence of starch in a leaf-on exposure to sunlight, the leaf is put into alcohol contained in a beaker and boiled over a water bath. 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