7. Water is taken up by the roots from the soil, sent up through the stem and finally brought to the leaves (site of photosynthesis) through the xylem tissue. Are the following statements true or false? (2) Photosynthesis is dependent on light. d.The student dipped the leaf in boiling water for a minute to kill the cells. Photosynthesis is an important activity of all green plants which are able to synthesis food from carbon dioxide and water in the presence of chlorophyll and light energy. Describe the main chemical changes which occur during photosynthesis in: The light reaction occurs in two main steps: (1) Activation of chlorophyll – On exposure to light energy, chlorophyll becomes activated by absorbing photons. 1. The production of starch, and not glucose, is often used as a measure of photosynthesis in leaves because, a) starch is immediate product of photosynthesis, b) glucose formed in photosynthesis soon gets converted into starch, 2. 10. (h) The tissue that transports manufactured type of starch from leaves to all parts of the plants. (c) Then place it again in hot water to soften it. (c) Name the biological process which was the starting point of the whole chain. During photosynthesis, the oxygen in glucose comes from, (a) The category of organisms that prepare their own food from basic raw materials. c. The fluid that transports fatty acids and glycerol. (b) Invert a test-tube full of water over the stem of the funnel. Share your Results: Facebook Twitter Google+ VK. Hydrogen and oxygen are produced here, along with release of electrons, which converts ADP into ATP. Solution:-, (e) Green plants are consumers. (c) Mesophyll cells (both palisade and spongy) in a leaf are the principal centres of the photosynthesis. Invert a test tube full of water over the stem of the funnel. The glucose produced is either immediately used up by the cells or stored in the form of starch. b. (b) The outside atmospheric temperature has no effect on the rate of photosynthesis. (e) The organisms that can be called “natural purifiers” of the air. Solution:-, (i) Green plants perform photosynthesis. Green grass being a producer is capable of producing its own food by photosynthesis. Excretory System ICSE Class-10 Concise Selina Biology Solutions for ICSE Class 10 Chapter-9. (c) During the starch test, why was the leaf, (1) boiled in water (2) boiled in methylated spirit. Solution:-, (e) Chlorophyll and chloroplast (part of plant cell), 2. (d) Xylem Tissue in the Leaf Veins: Water is essential for photosynthesis to occur. (c) Carbon dioxide released by the snail during respiration is used by the plant for photosynthesis. Explain briefly the role of the following structures in this process. c. Destarching ensures that any starch present after the experiment has been formed under experimental conditions. (h) Photosynthesis occurs only in cells containing chloroplasts. A plant used for an experiment on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. (a) What aspect of photosynthesis was being tested? The chlorophyll on exposure to light energy becomes activated by absorbing photons. Most leaves have the upper surface more green and shiny than the lower one. This increases the rate of photosynthesis in the plant placed in test tube B which leads to the release of more amount of oxygen. Is there any control in this experiment? 4. Chlorophyll is the foundation site for the photosynthesis in green plants. (e) The starting point of carbon cycle is the release of CO2 by animals during respiration. 6. (f) Write the overall chemical equation for the above process. “Oxygen is a waste product of photosynthesis.” Comment. Download pdf of Class 10 Chapter 6 in their respective links. Most leaves have the upper surface more green and shiny than the lower one. Photosynthesis results in gain of dry weight of the plants. The potted plant was kept in the dark for 24 hours. d. Describe step by step, how the candidate proceeded to test the leaf for the presence of starch? ShikshaHouse. The raw material for respiration is glucose. Photosynthesis results in gain of dry weight of the plants. If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will continue to occur because the dark reaction is independent of light and it occurs simultaneously with the light dependent reaction. (b) What phenomenon do the thick arrows A and B indicate? (a) The student wanted to show that sunlight is necessary for photosynthesis. To get purified air in her room she kept some of the plants in a closed room, it leaves turned pale in colour after some days. Extramarks, an e-learning website offers online tutorials for ICSE class 10 Experiments on Transpiration Chapter. (Make sure the level of water in the beaker is above the level of the stem of the funnel). Significance and major differences between mitotic and meiotic division. (f) If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will fail to occur. Solution:-. Complete the following food chains by writing the names of appropriate organisms in the blanks: 14. Date. Animals are heterotrophic (different nutrition). (C) The electrons (e–) are used in converting ADP (adenosine diphosphate) into energy-rich compound ATP (adenosine triphosphate) by adding one phosphate group Pi (inorganic phosphate), (ii) The reaction is the phase do not require light energy and occur simultaneously with the light reaction (time gap between the two being less than even one-thousandth of a second). (c) What is the purpose of keeping a snail in test-tube B? Why is it necessary to place a plant in the dark before starting an experiment on photosynthesis? In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. (b) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. (Select the most appropriate option in each case), 1. (e) Phloem tissue in Leaf Veins It takes place in the presence of light. Question 1 (a) Name the following: [5] (i) The organization which procures and supplies blood during an emergency. Photosynthesis is responsible for the presence of oxygen in our atmosphere. Available here are Chapter 5 - Transpiration Exercises Questions with Solutions and detail explanation for your practice before the examination A candidate studied the importance of certain factors in photosynthesis. 4. Photosynthesis. The oxygen (O) component is given out as molecular oxygen (O2). (e) The phloem transports the photosynthetic products from the leaf to the other parts of the plant. The gas released during photosynthesis is oxygen. With the rise in temperature, the rate of photosynthesis rises. (e) The starting point of carbon cycle is the release of carbon dioxide by animals during respiration. Some of this oxygen may be used in respiration in the leaf cells, but the major portion of it is not required and it diffuses out into the atmosphere through the stomata. How do non-green plants such as fungi and bacteria obtain their nourishment? Animals derive their food from plants either directly by eating their part, or indirectly by eating the plant-eater. Good. Practice biology sample question papers to score high in exams. Solution:-. (b) Before beginning the experiment, the plant was kept in dark in order to destarch it, i.e. Enumerate the steps involved in testing a green leaf for the presence of starch. Why? Which one chemical reaction occurs during photosynthesis? It is next boiled in methylated spirit to remove chlorophyll. The rate of photosynthesis increases up to the temperature 35oC after which the rate falls and the photosynthesis stops after 40oC. (b) Immediate product of photosynthesis is glucose. Chloroplasts are minute oval bodies bounded by a double membrane, and their interior contains closely packed flattened sacs arranged in piles lying in a colourless ground substance called the stroma. “Oxygen is a waste product of photosynthesis.” Comment. The related topics in this chapter are chlorophyll, regulation of stomatal opening for letting in carbon dioxide, the process of photosynthesis, adaptations in the leaf to perform photosynthesis, factors affecting photosynthesis and carbon cycle. they are able to produce their own food from basic raw materials. Correct Statement: Respiration results in loss of dry weight of the plants. Given below is the representation of a certain phenomenon in nature. Oxygen supports all life on earth. The glucose is converted into insoluble starch and later into soluble sugar i.e. There is no start point or end point in the carbon cycle, the carbon is constantly circulated between the atmosphere and the living organisms. and the region, which does not contain starch, turns (5) ………………. With four organisms 1 – 4. 8. Answer the questions that follow: (a) Name the physiological process that releases the bubbles of oxygen. Chloroplasts are the kind of plastids found in the mesophyll cells of the leaf. (e) Give an example of a water plant that can be used in the above experiment. All green plants and a few other autotrophic organisms utilize photosynthesis to synthesize nutrients by using carbon dioxide, water and sunlight. The purpose of keeping a snail in test-tube ‘B’ is to increase the rate of photosynthesis by increasing the concentration of carbon dioxide. If the rate of respiration becomes more than the rate of photosynthesis, plants will: (a) continue to live, but will not be able to store food, (c) grow more vigorously because more energy will be available, (d) stop growing and die gradually of starvation. The leaves will not show the presence of starch. (a) Dark reaction of photosynthesis occurs during night time. To test the leaf for starch, the leaf is boiled in water to kill the cells. During this time oxygen is given out by plants as a waste product and they take carbon dioxide to make food their own food. (d) The dark reaction of photosynthesis is known as Calvin cycle, (e) In the flowering plants, food is transported in the form of sucrose. 5. Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis is the best study material for those students who are finding difficulties in answering the questions. (b) Immediate product of photosynthesis is glucose. CBSE ... Factors affecting Photosynthesis and Experiments on Photosynthesis; Absorption by Roots - The processes involved. (f) The source of carbon dioxide for aquatic plants. During this period, all the starch from the leaves will be sent to the storage organs and the leaves will not show the presence of starch. Processes of photosynthesis-; 1)Light reaction: It takes place only in presence of light and occurs in grana region of plastids. Correct Statement: Starch produced in a leaf is stored temporarily in the leaf until the process of photosynthesis. Also the epidermis is covered by a waxy, waterproof layer of cuticle. This page consists of solutions of all questions asked in ICSE Biology Photosynthesis. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch. Visit official Website CISCE for detail information about ICSE Board Class-10. The main aim of this experiment is to describe the importance of carbon dioxide in the photosynthesis. In the darkness, respiration alone is responsible for changes in the gaseous composition of the plant’s surrounding atmosphere. No living being can remain alive without oxygen. 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 … How do non-green plants such as fungi and bacteria obtain their nourishment? With four organisms 1-4. (b) Photosynthesis is a physiological process by which plant cells containing chlorophyll produce food in the form of carbohydrates by using carbon dioxide, water and light energy. a) Carbon dioxide is reduced and water is oxidised, b) Water is reduced and carbon dioxide is oxidised, c) Both carbon dioxide and water are oxidised, d) Both carbon dioxide and water are reduced, 7. ... ICSE 10 Biology Revision Notes. A glowing splinter bursts into a flame which shows the presence of oxygen. Solution:-. Author Rating. The phenomenon is represented above is the food chain. Explain briefly the role of the following structures in this process. (3) Chemical equation for the process of photosynthesis: The diagram below shows two test-tubes A and B. Test-tube A contains a green water plant. Carbon dioxide is used up and oxygen is released. Both test-tubes are kept in sunlight. One would easily think that the rate of photosynthesis will increase with light intensity. To register for our free webinar class with best Biology tutor in India. Given below is a schematic diagram to illustrate some aspects of photosynthesis. (c) Stroma is the ground substance in …………… (cytoplasm, chloroplast, ribosomes). Test to determine the presence of starch in a leaf: Given alongside is the diagram of an experimental set-up: (a) What is the objective of this experiment? (c) During the starch test, why was the leaf. they depend directly or indirectly on the producers for their food. The upper surface is thicker than the lower surface and also the epidermis is covered by a waxy, waterproof layer of cuticle. (d) Why does test-tube B have more bubbles of oxygen? Question 1: Define transpiration. (g) Photosynthesis is considered as a process supporting all life on earth. 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