Photosynthesis 9. (ii) Why was the plant placed in the dark before beginning the experiment ? Answer: Question 2: Stroma of chloroplast and Grana of chloroplast. Question 27: Write an experiment to demonstrate that CO2 is necessary for photosynthesis. 14. Thylakoids. 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. i. Answer: (i) Chloroplast. Answer: Photochemical phase of photosynthesis is light dependent. Plants release oxygen as a waste product during photosynthesis. 12. Answer: (i) (ii) Photo chemical phase of photosynthesis is light dependent. Leave it in the sunlight. equation of photosynthesis class 10 Which process is the ultimate source of energy for all living organisms ? (False, Photosynthesis occurs in all green plants.) He holds a Bachelor of Science in geography from Durham University. Glucose 9. Phloem 11. His work has appeared in "Floreat Castellum" and "The Castle Society" magazine. 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: The rate of photosynthesis decreases and finally stops when the green plant gets green light because green light is not absorbed but reflected back by the plant. (True) 10. Plastoquinone: A small molecule involved in electron and proton transfer in photosynthesis. So, photosynthesis occurs in the presence of Carbon dioxide, Water, Sunlight and Chlorophyll(catalyst- which helps in the reaction to occur but itself do not includes in it). In contrast, cellular respiration is a catabolic process resulting in the breaking down of organic molecules to release energy. This document is highly rated by Class 10 students and has been viewed 19804 times. Question 4: Chloroplasts are called energy converters. (ii) How many veins have been shown. (iv). 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. 11. 4. Starch 10. 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. Explain this statement. (True). Chloroplasts are regarded as complete photosynthetic units of plants. BASIC BUILDING CONCEPTS 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. Overview of photosynthesis. MY ACCOUNT LOG IN; Join Now | Member Log In. 13. Question 14: How is the rate of photosynthesis affected when a green plant gets green light ? Answer: Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment, which comes from dead animals and plants. Using the above information, answer the following questions : (i) State the aim of the above experiment. The equation depicts the process by which plants and some bacteria produce glucose from carbon dioxide and water using energy from sunlight, as indicated in Jones and Jones' Advanced Biology Textbook (1997). Question 5: ATP is needed for dark reaction. Answer: The splitting of water molecule into two component ions by light is known as photolysis of water. Why are they called so ? A light induced reaction which leads to splitting of water is Photolysis of water. This energy is used during photolysis to split the water molecule into hydrogen and oxygen. Study the diagram and answer the questions that follow: (i) Why was the plant initially kept in darkness for 24 hours? Class 10 Science Chapter 1 Extra Questions and Answers Chemical Reactions and Equations. The leaf was then tested for starch. Justify your answer. (v) Give the chemical equation to represent the process of starch formation in plants. The chloroplasts are the actual sites of photosynthetic reactions-light and dark reactions which result in the formation of glucose. At the end of this time leaf X and leaf Y were tested for starch. The apparatus was kept in sunlight for almost the whole day. NADPH: Reduced form of nicotinamide ademne dinucleotide phosphate, a small water soluble molecule that acts as a hydrogen carrier in biochemical reactions. Test the leaf for starch with iodine solution. Answer: 1. It takes place is chlorophyll containing thylakoids of chloroplast. Answer: Answer has not given due to out of present syllabus. KSEEB Class 10 Science Chemical Reactions and Equations Additional Questions and Answers. In words, the equation translates to the combining of water, carbon dioxide and light energy to produce glucose and oxygen. - [Instructor] Photosynthesis is pretty awesome. Answer: 1. Mushroom 10. Dec 26, 2020 - CBSE Class 10 - Science - CH6 Life Processes (Photosynthesis) Photosynthesis Class 10 Notes | EduRev is made by best teachers of Class 10. 12. Photosynthesis is usually represented by the equation 6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2. (ii) The special condition inside the flask is that there is no CO2 in the air as it has been absorbed by the KOH. Name the tissue that transports manufactured starch from the leaves to all parts of the plant. Answer: Magnesium (Mg) ☛ Watch Khanacademy Photosynthesis video on Photosynthesis: Grana 6. Chlorophyll 3. Photosynthesis is a process by which plants prepare food. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. Calvin cycle was proposed by Melvin Calvin. (d) H+ combines with CO2 in dark reaction to produce glucose. A variegated leaf (one that has green as well as white patches) will only photosynthesize in the green areas. Carbon dioxide enters the leaf through Stomata. APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 5 Photosynthesis for ICSE Board Examinations. The chlorophyll on exposure to light energy becomes activated by absorbing photons. 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 ? Calvin Cycle 3. Answer: (i) Photosynthesis. Each year, photosynthesis synthesizes approx. After a few hours, test this and any other leaf of this plant for starch. Too much light destroys chlorophyll. Answer: (i) In the cell organelle called plastids (or chloroplasts). (d) Decreases because carbon dioxide acts as a limiting factor. Thus they are dependent on photosynthesis. Chloroplast 4. Answer: The chlorophyll traps solar energy and converts it into chemical energy. The physiological process being studied is Photosynthesisii. You can download the Class 10 Biology ICSE Textbook Solutions with Free PDF download option. 3. (iii) Leaf is boiled in water to kill the cells and boiled in alcohol to remove chlorophyll. 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. Photosynthesis can also occur n artifidal light such as that of a 100 watt electric lamp. ICSE Solutions for Class 10 Biology – Photosynthesis. Question 16: Explain why transpiration and photosynthesis are interlinked during the day. a) Light: Visible spectrum of the sunlight ranges from 380 to 750 nanometres in wavelength. Question 7: A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. ATP: Adenosine triphosphate, a small water soluble molecule that acts as an energy currency in cells. Red 7. (i) What is the aim of the experiment ? So, during day time photosynthesis and stomatal transpiration occurs simultaneously. (iv) In what manner do the leaves 1 and 2 differ at the end of the starch test ? The alphabet ‘A’ represents a certain condition inside the flask. Based in Manchester, England, John Newton has been writing since 2006. In most plants, water is supplied from the roots, with the leaves collecting carbon dioxide via the stomata and sunlight captured by the chloroplasts in the leaves. (ii) Is there any control in this experiment ? How can it be destarched ? Photosynthesis, derived from the Greek words photo, meaning "light," and synthesis "putting together," is a process used by plants and some bacteria to harness the energy from sunlight to convert water and carbon dioxide to produce sugar (glucose) and oxygen. (iv) Define the phenomenon. The main reaction which means the breaking up of water molecules through light. 4. 9. The overall balanced equation is 6CO2 + 6H2O -----> C6H12O6 + 6O2. Photosynthesis occurs only in plants. A dark reaction is a Thermochemical reaction. (iii) (1) To kill the cells. 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. (True) 15. CBSE Class 10 Science Practical Skills – Light is Necessary for Photosynthesis. Iodine, Question: 1. The green colouring matter of the plants. NADP (Nicotinamide Adenine dinucleotide phosphate): It is a coenzyme. 5.Photosystem Organization 6.Equation of photosynthesis 2. (ii) No CO2 in the flask. Check back soon! 4. The light-dependent reaction uses energy captured from sunlight by the chloropasts in plant leaves to produce a supply of electrons for the light-independent reactions. Photosynthesis 7. Question 1: Draw a neat and well-labeled diagram of the Chloroplast. Learn Photosynthesis Formula and Balanced Chemical Equation for Photosynthesis at Vedantu.com Formation of ATP in the chioroplast in the presence of light is called photophosphorylation. 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. 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). Question 9: (i) Draw a neat and well-labelled diagram of the Chloroplast. In an ionic equation, not only total number of atoms on both sides of equation should be ———- but also —– on both sides should be … Carbon cycle. Question 1: What are the basic requirements of photosynthesis ? Download Formulae Handbook For ICSE Class 9 and 10. 5. KOH absorbs CO2. 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 ? Photosynthesis results in loss of dry weight of the plant. Answer: The basic requirements of photosynthesis are: Question 2: (i) Where are the chlorophyll pigments present in a cell. The light-independent reactions use energy from the supply of electrons to reduce carbon dioxide to produce glucose. The process of photosynthesis takes place in the dark. (b) I will select destarched plant so I can demonstrate the synthesis of starch through iodine test. (b) Why would you select a destarched plant ? Plastoquinone 6. It is rinsed with hot water to remove alcohol and spread it on a white tile. Photosynthesis 2. (v) The leaf is then washed in water and tested with iodine. (v) Photosynthesis is the source of energy food and oxygen. photosynthesis basics study for class 10th 1. Answer: When a plant is kept in sunlight, CO2 released by respiration gets used by photosynthesis to synthesize food. 4OH ——> 2H2O + O2, Mention, if the following statements are True or False. 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