2. 8. (ii) How many veins have been shown. Maximise your exam preparation with Selina Solutions for ICSE Class 10 Biology Chapter 6 Photosynthesis. Test the leaf for starch with iodine solution. How chlorophyll trap sunlight, what are the role of photosystem P680 and 700. Granum 2. Answer: 1. (ii) Name the chemical used for testing the presence of starch. Chlorophyll absorbs blue light effectively and then the red light, but proves to be a poor absorber of green light. Answer: Blackman (1905) established the law of limiting factor in connection with photo-synthesis. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’. 230-250 molecules of chlorophyll make one quantasome. The main reaction which means the breaking up of water molecules through light. Chloroplast 4. Pour iodine solution on it. Plastoquinone: A small molecule involved in electron and proton transfer in photosynthesis. Question 8: Which tissues and cells are mainly concerned with photosynthesis ? 2. Radiant energy is converted into chemical energy by photosynthesis. The alphabet ‘A’ represents a certain condition inside the flask. (iii) To show that oxygen is given out during photosynthesis. Photosynthetic rate is higher in red and blue light. (False, Transpiration occurs along with photosynthesis.) Question 6: Why green leaves are thin and broad ? It takes place only in the presence of light. Question 1. (iii) What is the aim of the experiment? 9. Answer: (i) In the cell organelle called plastids (or chloroplasts). Chlorophyll 3. Out of nine types of chlorophyll, chlorophyll ‘a’ and ‘b’ are most abundant. Question 14: How is the rate of photosynthesis affected when a green plant gets green light ? Glucose 9. CO2 is the life supporting gas produced due to photosynthesis. 6. Carbon dioxide plays an important role in providing carbon for the process of photosynthesis. 7. During respiration CO2 is given out while during photosynthesis O2 is given out. 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. Basic raw materials for photosynthesis One of the product of Photolysis of water is oxygen. Lets have a look at the process of photosynthesis and also explore its importance. Cuticle 2. Stomata – through which exchange of gases takes place. 6. Oxygen is used in respiration whereas it is given out as a by-product in photosynthesis. Photosynthesis utilizes carbon dioxide and water. (iv) Then the leaf is boiled in water for 2-3 minutes and then boiled in alcohol to remove the green chlorophyll. Life processes include nutrition, respiration, circulation or transport, excretion, and reproduction. (iv) Write a balanced chemical equation to represent the process of photosynthesis. 13. (ii) Is there any control in this experiment ? 11. Plants release oxygen as a waste product during photosynthesis. Then in the early hours of the morning she covered one of the leaves with black paper in the centre only. It takes place is chlorophyll containing thylakoids of chloroplast. 4. 2. Leaves possess small pores called as stomata on both their surfaces. 9. What do you mean by sistolic and distolic pressure. Justify your answer. 4. Photosynthetic Membrane: A bilayer of lipid molecules in which are embedded proteins that transform light’energy into chemical free energy. 10. 4. Because most biochemical reactions occur at a constant temperature and pressure. Photosynthesis: It is the process by which green plants manufacture food by using carbon dioxide and water in the presence of sunlight. Xylem 5. Study the diagram and answer the questions that follow: (i) Why was the plant initially kept in darkness for 24 hours? (False, Photosynthesis occurs in all green plants.) (iv) In what manner do the leaves 1 and 2 differ at the end of the starch test ? How many Chloroplasts can be found per square millimeter of leaf surface? Question 19: What is the law of limiting factor ? (2) Why would you select a destarched plant ? (e) Cannot tell from the information given. Leaf B and Leaf C will turn blue-black. (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. (True) 18. The leaf is boiled with alcohol over a water bath till it becomes colourless. Question 9: (i) Draw a neat and well-labelled diagram of the Chloroplast. (iv) Give an overall balanced chemical equation to represent the process named in (i) above. The leaf anatomy is best suited for collecting the raw materials. It takes place only in the cells containing chlorophyll. Iodine, Question: 1. Which would do maximum harm to a tree? (2) I will select destarched plant so I Can demonstrate the synthesis of starch through iodine test. Question 13: Oxygen given out during photosynthesis comes from water. The potted plant was then placed in sunlight for a few hours. Photosynthesis occurs in all the cells of a plant. Column ‘II’ is a list of items related to ideas in Column ‘I’. Answer: This process produces food and releases oxygen, both of which are necessary to maintain life on earth. Photosynthetic Membrane 8. (iii) Animals eat green plants or eat animals that feed on green plants. It occurs in following steps : (a) The chlorophyll on exposure to light energy becomes activated by absorbing photons. (iii) The process that takes place first in the photolysis of water is H+ and OH- ions with the help of energy from sunlight. (iv) Leaf 1, no change in colour with starch list. The by-product of this process is oxygen. Land plants obtain their CO2 from atmosphere. 2. The process of photosynthesis requires solar energy, water and carbon dioxide. (True) 10. (iii) State the functions of part 4 and 5. (v) The leaf is then washed in water and tested with iodine. Anatomy of leaves does not resemble Kranz anatomy. (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. Photosynthesis: The process by which green plants prepare food is called photosynthesis. (iv) Leaf A will be yellowish-white. (Chlorophyll), 1. 7. Leaves are considered to be the sites of photosynthesis. Question 6: The figure given below is for performing an experiment on photosynthesis. All the starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of plant. Too much light destroys chlorophyll. (iv) If ice cubes were added to the water, the rate of bubble formation would : (a) Remain the same. Also, mention the process involved in each of these steps. It plays a vital role in the process of photosynthesis. The leaf was then tested for starch. (ii) The leaf portion which is not covered with black paper is the control as it receives sunlight. (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. 12. (iii) Name the phenomenon which takes place in the above diagram. In plants what is the site of photosynthesis. 10. (True) 3. The chlorophyll on exposure to light energy becomes activated by absorbing photons. Photosynthesis: 1. (iii) What do you conclude from this experiment? 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. It is the process by which organisms can assimilate and utilise food for their basic needs. Question 7: State one important function of chloroplasts. Name the tissue which transports water and mineral in a plant. Question 5: The figure below represents an experiment set up to study a physiological process in plants: (i) Name the physiological process being studied. (iii) What is the aim of the experiment? The unit of light absorbed by the chlorophyll during photosynthesis is the proton. Oxygen is given out by green plants. Name the process which is responsible for conversion of solar energy to chemical energy that is essential to sustain the life on this earth ? Question 2: (i) Identify the above diagram. (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. Justify your answer. ... explain the process of photosynthesis. Which one of the following would not be a limiting factor for photosynthesis ? Opening and closing of the stomata are brought about by the guard cells present in them. (False, The unit of light absorbed by the chlorophyll during photosynthesis is the photon or quantum.) (ii) Why was the plant placed in the dark before beginning the experiment ? This energy is used during photolysis to split the water molecule into hydrogen and oxygen. Leaves are broad and flat to increase the surface area for photosynthesis. Question 1: All life on earth Would come to an end if there were no green plants. Plants obtain water from the soil by the process of absorption performed by roots. (iv) Give a well balanced equation to represent the process. Using the above information, answer the following questions : (i) State the aim of the above experiment. The chemical substance used to test the presence of starch in the cell of a leaf. (True) 12. Photosynthesis is an autotrophic mode of nutrition by plants and some bacteria. The chloroplasts are the actual sites of photosynthetic reactions-light and dark reactions which result in the formation of glucose. The conversion of physical energy of light into chemical energy by the chloroplast is called Photophosphorylation. Intensity of light also determines the rate of photosynthesis. Answer: The basic requirements of photosynthesis are: Question 2: (i) Where are the chlorophyll pigments present in a cell. Each granum contains around 10-20 thylakoids. Answer: (i) 3-5, (ii) Oxygen, (iii) Water, (iv) Decreases because the temperature drops, (v) Increases because photosynthesis increases. What is the percentage of CO2 in air ? 13. During election transfer NADP get reduced and (rom NADP + H (NADPH2). Photosynthesis is the process of plants and trees. 4OH ——> 2H2O + O2, Mention, if the following statements are True or False. Answer: Question 3: Chloroplast and Chlorophyll. Carbon dioxide is reduced to carbohydrates. Question 1: Draw a neat and well-labeled diagram of the Chloroplast. The plant kept in bell without Potassium hydroxide can do photosynthesis and form starch. Carbon cycle. (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). Explain the process. Name only one plant, you are familiar with which has no chlorophyll. (True). (ii) List the events taking place in the photo-chemical phase of Photosynthesis. Answer: (i) To prove that CO2 is necessary for photosynthesis. (iv) Light supplies eiergy in the form of photons to split water during tight reaction. Question 1. Stomata contains green pigment called chlorophyll. 14. A cell that lacks chioroplast does not: (a) Evolve carbon dioxide (b) Liberate oxygen (c) Require water (d) Utilize carbohydrates, 5. [AI 2008] Answer: Phloem tissues. KOH absorbs CO2. It is a process of splitting of water molecule into 2H+ + 4e- + 1/2 O2 in the presence of sunlight by activated photosynthetic pigments. Photolysis 8. Plastoquinone 6. What does light energy have to do with the process of photosynthesis? (d) Decreases because water freezes. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. 5. Thus they are dependent on photosynthesis. 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. A variegated leaf (one that has green as well as white patches) will only photosynthesize in the green areas. 3. List the three events that occur during the process of photosynthesis. Answer: (1) 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. Why are they called so ? Question 1. (b) Increase because more water is added. The numeral ‘1’ represents a certain condition inside the flask and the numeral ‘2’ represents a chemical responsible for this condition. Answer: The splitting of water molecule into two component ions by light is known as photolysis of water. 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. Nutrition 9. (2) To destroy the chlorophyll. No transpiration occurs during photosynthesis. 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. Download Formulae Handbook For ICSE Class 9 and 10. (iii) Xylem – helps in the conduction of water. 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. What are the differences between living and nonliving organisms? 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. Question 18: Name the molecules which are called assimilatory power ? The green colouring matter of the plants. (iii) Light is necessary for photosynthesis. 8. Question 9: Why is photosynthesis important in nature ? The leaf absorbs CO2 from the atmosphere through its stomatal openings. Photosynthesis is important because it provides two main things: food; oxygen; Some of the glucose that plants produce during photosynthesis … At the end of this time leaf X and leaf Y were tested for starch. (d) H+ combines with CO2 in dark reaction to produce glucose. NADPH: Reduced form of nicotinamide ademne dinucleotide phosphate, a small water soluble molecule that acts as a hydrogen carrier in biochemical reactions. After a few hours, test this and any other leaf of this plant for starch. During this process, the solar energy is converted into chemical energy and carbohydrates are formed. 8. 11. This shows that the region which did not receive light could not synthesise starch. Life processes Photophosphorylation 11. Question 1: Light reaction and Dark reaction. Photosynthesis is a biological process utilized by all green plants to synthesize their own nutrients. The process by which plants produce their food. Phosphoglyceric acid is synthesised as the product. Name the tissue that transports manufactured starch from the leaves to all parts of the plant. The end products of photosynthesis are carbohydrates and oxygen. Answer: (i) The student is investigating the necessity of sunlight for photosynthesis. Find out how Melvin Calvin worked out the complete biosynthetic pathway for synthesis of sugar. Answer: Chloroplast contains chlorophyll which is used to trap the solar energy from the sunlight which falls on the leaf. 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). A plant that does not perform photosynthesis is Fungus. It takes place in chlorophyll containing thylakoids of chloroplast. Answer: (i) Photosynthesis. 5. (ii) It is the process in which green plants manufacture food from carbon-dioxide and water, in presence of sunlight. RBSE Class 12 Biology Chapter 10 Essay Type Questions. Splitting of water molecules releases oxygen as a by-product. Question 21: On a bright sunny day water weeds growing in an aquarium were actively giving off bubbles of.gas. (ii) To remove all starch from the leaves of the plant. Answer: (i) Chlorophyll is necessary for photosynthesis. If false rewrite the wrong statement in its correct form: 1. 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. Answer: When a plant is kept in sunlight, CO2 released by respiration gets used by photosynthesis to synthesize food. Organisms which cannot prepare their own food by photosynthesis. Chlorophyll, Chlorophyll b, n-carotene, Photon. (iii) Name an alternative chemical that can be used instead of KOH. (iv) In what way will the three leaves (A, B and C) differ at the end of the experiment, when tested with iodine solution? Light intensity, Water content, Temperature, Chlorophyll. The complete chemical reaction is labelled as photosynthesis. (i) What aspect of photosynthesis was being tested ? AIIP stands for Adenosine diphosphate. 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 ? (ii) Name the membrane that connects thylakoid of one granum With the other granum. Life Processes Class 10 Important Questions Short Answer Type I. (b) I will select destarched plant so I can demonstrate the synthesis of starch through iodine test. 3. Answer: 1. Water may be used inside the plant but O2 released into the atmosphere. 3. One of the leaves was covered with black paper in the centre. 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: (i) The object of this experiment is to show that CO2 is necessary for photosynthesis. Essentiality of carbon dioxide is demonstrated by bell jar 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. A series of chemical reactions occur is quick succession initiated by light, therefore the phase is called photochemical phase. (False, Photosynthesis results in gain of dry weight of the plant.) It traps the solar energy and converts into chemical energy which is utilised in the dark reaction of photosynthesis to form glucose. You can download the Class 10 Biology ICSE Textbook Solutions with Free PDF download option. (ii) Take a potted plant and keep it for 2-3 days in dark to destarch its leaves. It was then set up as shown in the diagram and exposed to light for about 12 hours. (iii) Leaf is boiled in water to kill the cells and boiled in alcohol to remove chlorophyll. Answer: The tissues and cells which contain chloroplasts are mainly the palisade parenchyma and spongy mesophyll cells of a green leaf. Answer: (i) That light is necessary for photosynthesis. (iii) (1) To kill the cells. (a) Oxygen (b) Light (c) Carbon dioxide (d) Chlorophyll, 4. So no carbon dioxide is liberated, and respiration cannot be demonstrated. (ii) Iodine solution. Question 28: List the events taking place in the photo-chemical phase of Photosynthesis. What does NADP stand for ? Name: _____ Class: _____Date: _____ CHAPTER#10.1-10.2 STUDY GUIDE QUESTIONS 1. It is green flattened sac like structure. 4. Answer: (i) Photosynthesis. Question 6: Respiration is said to be the reversal of photosynthesis. The dark reaction of Photosynthesis is light independent. (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. If so, state the same. (v) If some sodium bicarbonate is added to the water the rate of bubble formation: (a) Increases because more respiration occurs. 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. Question 5: ATP is needed for dark reaction. Heterotrophs 7. PhotoLysis is the reaction which means the breaking up of water molecules. (ii) What is the special condition inside the flask ? Photosynthesis 7. Thus stomatal transpiration can take and CO2 can also enter the green leaf to enable photosynthesis to take place. 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