(a) Place some water plants (Elodea or Hydrilla) in a beaker containing pond water and cover them by a short-stemmed funnel. Respiration results in loss of dry weight of the plants. (h) Photosynthesis occurs only in cells containing chloroplasts. (h) The tissue that transports manufactured type of starch from leaves to all parts of the plants. (g) Photosynthesis is considered as a process supporting all life on earth. 2019-03-01. (c) Then place it again in hot water to soften it. It takes place in the thylakoid membranes of the chloroplast and includes photosynthetic pigments arranged into two light-harvesting complexes within photo system I … Oct 16 • Board Sample Papers • 6131 Views • 1 Comment on ICSE Sample Paper of Biology Class 10 Indian Certificate of Secondary Education ( ICSE ) is an examination conducted by the Council for the Indian School Certificate Examinations which is a private non-governmental board of school education in India for class X. Answer : Photolysis in photosynthesis is the splitting of water molecules into hydrogen ions and hydroxyl ions in the presence of chlorophyll and light. The grass is eaten up by the grasshopper. A potted plant was taken in order to prove a factor necessary for photosynthesis. (b) Will it work satisfactorily? State any four differences between photosynthesis and respiration. (d) Write a balanced chemical equation to represent the process of photosynthesis. (a) Dark reaction of photosynthesis occurs during night time. We know that temperature is an important factor for the rate of photosynthesis. Required fields are marked *. (f) The source of carbon dioxide for aquatic plants. This reaction is known as photolysis of water. (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. (b) What phenomenon do the thick arrows A and B indicate? 6. Animals derive their food from plants either directly by eating their part, or indirectly by eating the plant-eater. 1 for their survival. The other uncovered leave of the potted plant act as a control. (Ensure that the level of water in the beaker is above the level of the stem of the inverted funnel). The region, which contains starch, turns ……………. Photosynthesis is the biological process which was the starting point of the whole chain. Light reactions take place during the first stage of 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. Green plants (producers) use carbon dioxide of the air to produce carbohydrates and release oxygen to the atmosphere. The pigment chlorophyll is contained in the walls of thylakoids. Solution:-, (d) Grass and grasshopper (mode of nutrition) Fungi and bacteria break down the organic matter to obtain the nourishment and they release carbon dioxide back in the atmosphere. Question 15 : Complete the following statement by filling in the blanks with the appropriate word from the choices given in … and the region, which does not contain starch, turns (5) ………………. During this period, all the starch will be removed from the leaves and stored in the storage organs. The potted plant was kept in the dark for 24 hours. The light reaction occurs in two main steps. The site of light reaction in the cells of a leaf is grana. (a) The student wanted to show that sunlight is necessary for photosynthesis. One would easily think that the rate of photosynthesis will increase with light intensity. The leaves will not show the presence of starch. Photosynthesis increases with the light intensity up to a certain limit only, and then it gets stabilised at the point. Both test-tubes are kept in sunlight. 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. (a)The hydrogen ions (H+) are picked up by a compound NADP (Nicotinamide adenine dinucleotide phosphate) to form NADPH. 1 for their survival. We Provide Step by Step Answer of Progress Check , MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type Questions and Structured / Applications / Skill Type Questions of Exercise-6 Photosynthesis ICSE Class-10 Concise . (b) Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll. Photosynthesis occurs in plants and some bacteria. Our specialist teachers have answered these exercises to help you with your exam preparation to achieve good marks in the subject. 4. (a) Dark reaction of photosynthesis occurs during night time. (d) Why does test-tube B have more bubbles of oxygen? 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