Our specialist teachers have answered these exercises to help you with your exam preparation to achieve good marks in the subject. Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment. Invert a test tube full of water over the stem of the funnel. Processes of photosynthesis-; 1)Light reaction: It takes place only in presence of light and occurs in grana region of plastids. Photosynthesis increases with the light intensity up to a certain limit only and then it gets stabilized. 5. (d) The dark reaction of photosynthesis is known as…………… (Hill reaction, cyclic phosphorylation, Calvin cycle). (d) Name one natural element which all the organisms 2-4 and even 5 are getting from No. 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. Carbon dioxide is used up and oxygen is released. 6. (b) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. 7. This also suggests that both respiration and photosynthesis are complementary processes to maintain the concentration of oxygen and carbon dioxide in the atmosphere. (e) Phloem tissue in Leaf Veins Answer the questions that follow: (a) Name the physiological process that releases the bubbles of oxygen. a. Chloroplasts are mainly contained in the mesophyll cells. (2) Respiration is not dependent on light. Raksha planted many plants in her home garden as she knew that the plants help to purify air. Complete the following by filling the blanks 1 to 5 with appropriate words/ terms/ phrases: To test the leaf for starch, the leaf is boiled in water to …………… (1). 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. b. The potted plant was kept in the dark for 24 hours. The essential chemical steps in this process are the same in all green plants. During this period, all the starch will be removed from the leaves and stored in the storage organs. Both test-tubes are kept in sunlight. The phenomenon is represented above is the food chain. Plants also store excess sugar by synthesis of starch Heterotrophs, including humans, may completely or partially consume plants for fuel and raw materials. It is next boiled in methylated spirit to (2) ……………. (c) Starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of the plant. (b) What phenomenon do the thick arrows A and B indicate? The plant in test tube B has more concentration of CO2 available because the snail releases CO2 during respiration. (g) The part of chloroplast where the dark reaction of photosynthesis takes place. The leaves will not show the presence of starch. For destarching, the potted plant can kept in a dark room for 24-48 hours. (b) Invert a test-tube full of water over the stem of the funnel. (c) What is the purpose of keeping a snail in test-tube B? Correct Statement: Photosynthesis stops at a temperature of above 40oC. (4) The oxygen is used and carbon dioxide is released in the process of respiration. 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 these set of reactions are independent of light and it occurs simultaneously with the light-dependent reaction. 3. (h) Photosynthesis occurs only in cells containing chloroplasts. Question 1. During this period, all the starch will be removed from the leaves and stored in the storage organs. 2. Solution:-. Your email address will not be published. Glucose is produced which is utilized by the plants. (b) Why was the plant placed in the dark before beginning the experiment? 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