Regulations of stomatal opening for letting in carbon dioxide, Two main phases of photosynthesis – (A) Light – Dependent Phase and (B) light – Independent (Dark) phase, Adaptations in leaf to perform photosynthesis, End result of the products of photosynthesis. Respiration results in loss of dry weight of the plants. This matter comes from dead animals and plants. Practise the chapter concepts by attempting mock tests with questions such as MCQs, true or false questions, short answer questions and more. Thus, the release of CO2cannot be demonstrated. During this period, all the starch will be removed from the leaves and stored in the storage organs. (c) The compound which stores energy in the cells. The region, which contains starch, turns (4) ……………. Fixation and reduction of carbon dioxide occurs in the stroma of the chloroplast through a series of reactions. 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. (1) Respiration occurs in all living organisms. 11. Photosynthesis occurs in plants and some bacteria. To obtaining expected result replace the lime water from potassium hydroxide because it absorbs carbon dioxide. Which one chemical reaction occurs during photosynthesis? Oxygen is released during photosynthesis. Yes, we have to take a step before starting the experiment. Photosynthesis prepared by Academic team of Entrancei . 5. (b) Cuticle (a) Dip the leaf in boiling water for a minute to kill the cells. (i) Light reaction 8. A potted plant was taken in order to prove a factor necessary for photosynthesis. No living being can remain alive without oxygen. (g) Stroma 4. (c) Mesophyll cells: Mesophyll cells are the main sites for photosynthesis. (b) Cuticle is transparent and waterproof to allow light to enter freely. Some of the oxygen may be used in respiration in the leaf cells (the phenomenon is called photorespiration), but the major portion of it is not required and it diffuses out into the atmosphere through the stomata. You will not be allowed to write during the first 15 minutes. ICSE Solutions Selina ICSE Solutions ML Aggarwal Solutions. During this period, all the starch will be removed from the leaves and stored in the storage organs. It is then placed in a dish and (3) …………. He took a potted plant and kept in the dark for over 24 hours. Nervous System. Hence most leaves have the upper surface more green and shiny than the lower one. Dip a leaf in boiling water for a minute to kill the cells. Most leaves have the upper surface more green and shiny than the lower one because chloroplasts and stomata are concentrated in the upper layers of the leaf which helps cells to trap the sunlight quickly. With four organisms 1 – 4. Solution D.2. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. Practice Test 1. Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment. (d) Xylem Tissue in the Leaf Veins: Water is essential for photosynthesis to occur. (b) The kind of plastids found in the mesophyll cells of the leaf. Download pdf of Class 10 Chapter 6 in their respective links. This process is called photophosphorylation. Solution:-, (e) Green plants are consumers. The student dipped the leaf in boiling water for a minute to kill the cells. 9. It is next boiled in methylated spirit toÂ remove chlorophyll. The atmospheric temperature is an important external factor affecting photosynthesis. Students who wish to score good marks in Biology practise Selina Solutions Concise Biology Class 10. (f) False State any four differences between photosynthesis and respiration. Solution C.14. However, in a sense, even this oxygen is not a waste because all organisms require it for their existence including the plants. Hence, it is difficult to demonstrate respiration as these two processes occur simultaneously. 7. These MCQ's are extremely critical for all ICSE students to score better marks. (d) Destarching of the leaves of a potted plant can occur only at night. Ice cold water will hamper the process of photosynthesis in the immersed leaf, even if there is sufficient sunshine. The absorbed energy is used in splitting the water molecule (H2O) into its two components (Hydrogen and Oxygen) and releasing electrons. Question 1: Define transpiration. Step 2:- Splitting of water. Green plants are called natural purifiers of the air. and the region, which does not contain starch, turns (5) ………………. Phloem is the tissue that transports manufactured type of starch from leaves to all parts of the plants. Now place the leaf in hot water to soften it. The region, which contains starch, turns blue-black colour and the region, which does not contain starch, turns brown colour. 3. It is not possible to demonstrate respiration in green plants kept in sunlight because during day time plants are undergoing photosynthesis. Ordinarily, there may be 40-50 chloroplasts in a cell. The potted plant was kept in the dark for 24 hours. The other uncovered leave of the potted plant act as a control. During this period, all the starch will be removed from the leaves and stored in the storage organs. Oxygen is the element which all the organisms 2-4 and even 5 are getting from No. (a) Guard cells: They regulate the opening and closing of stomata and thus regulate the entry of carbon dioxide through the stomata. Therefore, they are called autotrophs (self-nutrition). Students can download the ICSE Class 10 Biology Question Paper Solution 2018 PDF from the link below. b) glucose formed in photosynthesis soon gets converted into starch, Solution A.5. Solution C.7. Animals derive their food from plants either directly by eating their part, or indirectly by eating the plant-eater. We know that the oxygen is consumed during respiration in plants hence it cannot be demonstrated at the daytime, as plants carry out respiration at night. Respiration results in loss of dry weight of the plants. (b) The chemical substance used to test the presence of starch in the cell of a leaf is…………… (CaCl2, iodine solution, Benedict solution). 2. 10. Fill in the blanks with the appropriate answer from the choices given in the brackets. Grasshopper is a primary consumer (herbivore) and directly feeds on producers like grass. The splinter glows due the presence of oxygen in the test tube which proves that the gas collected in the test is released by hydrilla during photosynthesis. (v) photons, (iii) grana, (i) water molecules, (iv) hydrogen and hydroxyl ions, (ii) oxygen. Give reason. All other organisms, directly or indirectly depend on this food for their survival. d) ensure that the leaves are free from starch, Solution B.1. Photosynthesis - Get Get topics notes, Online test, Video lectures & Doubts and Solutions for ICSE Class 7 Biology on TopperLearning. (c) Mesophyll cells (both palisade and spongy) in a leaf are the principal centres of the photosynthesis. Multiple Choice Questions (MCQ) for ICSE Class 10 Biology chapters on Topperlearning. Are the following statements true or false? Solutions of Progress Check ,MCQ ,Very Short ,Long Type and Skill Type Questions .Step by Step Solutions of ICSE Class 10th Concise Biology. Solution C.11. (e) Phloem Tissue in the Leaf Veins: The prepared food is transported from leaves to all parts of the plant by the phloem tissue. Multiple Choice Questions. Circulatory System. (c) Name the biological process which was the starting point of the whole chain. (3) Respiration consists of two stages, they are inhalation and exhalation. Our specialist teachers have answered these exercises to help you with your exam preparation to achieve good marks in the subject. Your email address will not be published. The region, which contains starch, turnsÂ blue-blackÂ and the region, which does not contain starch, turnsÂ brown. Maximum students of CISCE Class 10 prefer Frank Textbook Solutions to score more in exam. Solution:-. A candidate studied the importance of certain factors in photosynthesis. b. The physiological process being studied is Photosynthesisii. (ii) Dark reaction. Bubbles appear in the stem which rise and are collected in the test tube. c. Photosynthesis (d) Write a balanced chemical equation to represent the process of photosynthesis. The leaves will not show the presence of starch. Chlorophyll is the green colouring matter found in plants. 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(i)Â Light Reaction:Â Required fields are marked *. With the rise in temperature, the rate of photosynthesis rises. (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. The leaf now becomes hard and brittle. Then he boiled the leaf in alcohol/methylated spirit over a water bath to remove chlorophyll. Photons, grana, water molecules, hydrogen and hydroxyl ions, oxygen. To register Biology Tuitions on Vedantu.com to clear your doubts. This is because if the plant is not destarched, then the experiment will give false results because starch stored previously may be detected in the leaf placed in the beaker even if no starch is produced during the experiment. Cell Cycle and Cell Division. If green plants were to suddenly disappear, then so would virtually all life on Earth. (a) What aspect of photosynthesis was being tested? Question 3: Give some adaptations in a green leaf for photosynthesis. Solution:-. Solution C.3. (b) Two cell organelles. (ii) Name the membrane that connects thylakoid of one granum With the other granum. (d) The xylem consists of tracheids and vessels, which transport water and minerals to the leaves. (3) Photosynthesis consists of two stages light reaction and dark reaction. Why is it necessary to place a plant in the dark before starting an experiment on photosynthesis? 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. Solution:-, (c) Producers and consumers (mode of nutrition) 1 for their survival. (a) False Vishnoi Publisher: Selina Publishers Language: . 6. The electrons (e–) are used in converting ADP into energy rich ATP by adding one inorganic phosphate group Pi. If so, state it. Complete the following food chains by writing the names of appropriate organisms in the blanks: Solution:-, (b) Light and dark reactions (products formed) 1. The light reaction occurs in two main steps. (d) Name one natural element which all the organisms 2-4 and even 5 are getting from No. A glowing splinter bursts into a flame which shows the presence of oxygen. The ICSE Class 10 Biology 2018 exam was conducted on 26th March 2018. Get the free view of chapter 6 Photosynthesis Class 10 extra questions for Concise Biology Class 10 Icse and can use Shaalaa.com to keep it handy for your exam preparation (e) The starting point of carbon cycle is the release of CO2 by animals during respiration. The oxygen (O) component is given out as molecular oxygen (O2). Answer : Hormones are the secretions from specific cells or glands in the body which are poured into the blood and have their effect on target cells or specific organs or tissues of the body. A plant used for experiments on photosynthesis should initially be placed in the dark for 24 to 48 hours to destarch the leaves. (d) False Is there any control in this experiment? This experiment contains lime water it does not absorb CO2. Students of ICSE Class 10 should practise the ICSE Class 10 Important Questions of Biology to ace in their final examination. Photosynthesis: It is the process by which green plants manufacture food by using carbon dioxide and water in the presence of sunlight. c. Why was the plant kept in the dark before the experiment? The light energy is then converted into chemical energy in the form of glucose using carbon dioxide (CO2) from the atmosphere, and water (H2O) from the soil. Bubbles of the gas will collect in the test-tube. This time is to be spent in reading the Question Paper. The leaf becomes hard and brittle. Solution:-, (e) Chlorophyll and chloroplast (part of plant cell), 2. ICSE Solutions for Class 10 Biology. The upper surface is thicker than the lower surface and also the epidermis is covered by a waxy, waterproof layer of cuticle. All life owes its existence to chlorophyll. Selina Solutions Concise Biology Class 10 Chapter 6 Photosynthesis, is the most significant life process. Free download of step by step solutions for class 10 Science chapter 6 - Photosynthesis-Provider Of Food For All of ICSE Board (Concise - Selina Publishers). a. 4. (d) Test the gas in the test-tube. iii. Given below is the representation of a certain phenomenon in nature. The main aim of this experiment is to describe the importance of carbon dioxide in the photosynthesis. Photosynthesis requires CO2 as the substrate in green plants. (ii)Â Dark reaction:Â The reactions in this phase does not require light energy and occur simultaneously with the light reaction. CO2 is also the product of respiration. A series of chemical reactions occur in very quick succession, initiated by light and therefore, the phase is called the photochemical phase. 9. Destarching ensures that any starch present after the experiment has been formed under experimental conditions. 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