In photolysis reaction, the water decomposes to form hydrogen and oxygen gas. keep the potted plant in darkness for about 48 hours (d) It is the right procedure for the experiment. Related articles. (a) starch is immediate product of photosynthesis. Question 18 : Write true or false. Аnswer: B) It is an exothermic reaction. Correct the false statements by changing the last word only. Plants that manufacture their own food are called heterotrophs. Are you one of those who finds science fascinating? What photosynthesis accomplishes, why it's important, and how the light-dependent and light-independent reactions work together. Photosynthesis consists of two stages, the light reactions, and the dark reactions. (B) Dark Reaction: Blackman reaction is called as dark reaction, because no direct light is required for this. On completion of the experiment to demonstrate that Dark reaction doesn’t mean that it happens in the absence of light. In which colour of light, plants can prepare their food best. (b) in a dark room with table lamp switched on Unlike many other endothermic reactions, photosynthesis does not absorb energy as heat. Overview of photosynthesis. Answer : i) Presence of more stomata to allow rapid exchange of gases like CO2 and O2. (c) steam from water bath dissolves the chlorophyll Class-10 » Science. Аnswer: To make food, plants need CO. Plants can prepare their food in blue light. When plants are kept in continuous darkness for about forty eight hours, all the starch present in them is used up for various biological processes and no new starch is formed due to absence of light. 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. Answer : Chloroplast is the cell organelle responsible for the photosynthesis. (d) the leaf covered with any of the above strips. Аnswer: (definition). Light reactions need light to produce organic energy molecules (ATP and NADPH).They are initiated by colored pigments, mainly green colored chlorophylls. Question 6: We provide step by step Solutions for ICSE Biology Class 10 … Photolysis Photophosphorylation It is a process of splitting of water molecule into 2H+ + 4e- + 1/2 O2 in the … Light-dependent phase is also known as the Hill reaction or photochemical reaction. (Dark Reaction by Calvin Cycle) Q4: Mention the conditions for photosynthesis. Why should we always use water bath while boiling the leaf in alcohol solution? Question 9: Answer : Chloroplasts are mainly found in the mesophyll cells located between the upper and lower epidermis of the leaves. Question 6: (d) D. Questions based on Reporting and Interpretation Skills (d) Water bath prevents the direct heating of alcohol which is highly inflammable and can catch fire. done clear. Following is the photosynthesis formula: (Light Reaction) Reduction of carbon dioxide to carbohydrates. Question 12 : Name the cell organelle responsible for photosynthesis. The result was: Question 21 : Account for the given below briefly. (d) Light is necessary for photosynthesis of starch in green plants. Plants can prepare their food best in blue light. In order to achieve that, interest and hard work alone wont be enough to work it out. These reactions happen only in … The rate of photosynthesis depends on all three factors i.e.—light, temperature, availability of components, i.e.,— CO. The inference is that (a) green light II. Revise important photosynthesis-based questions by watching our interactive exam decoded videos by Biology experts. (c) white light (b) reduction of C02 gas to carbohydrates Solution A.1. Dark reactions use the energy molecules that were generated during the light reactions. Аnswer: (b) Blue light is better absorbed among the other given lights (red is the best). In this page, you can find CBSE Class 10 Science Chapter 6 Extra Questions and Answers Life Processes Pdf free download, NCERT Extra Questions for Class 10 Science will make your practice complete. (a) extract starch A) It is an endothermic reaction. (a) Boil the destarched leaf in lime water. CBSE Class 10 Science Practical Skills – Light is Necessary for Photosynthesis. Call our LearnNext Expert on … Question 5: The production of starch, and not glucose, is often used as a measure of photosynthesis in leaves because. The process begins in the daylight, by gathering the light. It will catch fire if we heat the beaker containing alcohol directly on the flames of burner. MULTIPLE CHOICE TYPE Photosynthesis ICSE Class-10 Concise Selina Biology. “light is necessary for photosynthesis”, four students reported the inference as follows. Question 4: ii) Arrangement of chloroplasts on the upper surface of leaves so as to receive maximum amount of light. (d) prepare leaves for photosynthesis. Photosynthesis is a process by which plants prepare food. Question 1: The following events occur during the process of photosynthesis: The above step may not occur simultaneously in some plants. LIGHT REACTION (PHOTOCHEMICAL PHASE) Light reactions include light absorption, water splitting, oxygen release and formation of ATP & NADPH (high-energy chemical intermediates). (c) KOH solution (iv) keeping the set-up in sunlight; Carefully place this beaker in water bath and heat it till the alcohol begins to boil. Chloroplast is the cell organelle where photosynthesis takes place in plants and algae. Light Reactions: These reactions occur in the presence of sunlight and they are responsible for the generation of energy molecules such as ATP and NADPH. Question 6 : State the main function of thylakoids. (c) To avoid the loss of water during day times, the stomata will not open. We, at Vedantu, have analyzed th… (c) photolysis of water IV. Question 14 : Explain the term photolysis in photosynthesis. Which one of the following is true about the reaction taking place in photosynthesis process? 2. b) glucose formed in photosynthesis soon gets converted into starch. (d) (i), (iii), (iv), (ii). Also, mention the process involved in each of these steps. Photosynthesis takes place in leaf cells. (i) de-starching the plant; (c) activate chloroplasts Dip the leaves in boiling water for a few minutes. Question 7: During this reaction, carbon dioxide and water are converted into glucose by chlorophyll in the presence of light energy. Аnswer: Optimum temperature for photosynthesis is about 25 o C. About 35 o C - 45 o C. 9. Аnswer: Photosynthesis occurs in two steps: Light reaction and Dark Reaction. Light-independent reactions (dark reactions). E.g. 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