In most plants, water is supplied from the roots, with the leaves collecting carbon dioxide via the stomata and sunlight captured by the chloroplasts in the leaves. 3. Answer: (i) Photosynthesis. A light reaction is a Photochemical reaction. Question 4: What is the importance of photosynthesis in the life of the following : (i) Green plants (ii) Non-green plants (iii) Animals Answer: (i) Green plants are able to build up complex energy rich molecules of carbohydrates which are further used for different metabolic activities of cells. Starch 10. (iv). Question 7: A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. (True) 18. In an ionic equation, not only total number of atoms on both sides of equation should be ———- but also —– on both sides should be … Name the experiment to demonstrate the importance of light for photosynthesis. NCERT Class 10 Science Lab Manual – Light is Necessary for Photosynthesis. Question 5: A leaf is a food factory. Answer: (1) I will select white light because photosynthesis is maximum in white light while it is minimum in green light as green light is reflected by green plants. Question 2: (i) Identify the above diagram. The part of the chloroplast where the dark reaction of photosynthesis takes place. 8. Photosynthesis in One Shot | ICSE/CBSE Class 10 Biology | How Does Photosynthesis Happen?. Question 4: The figure below represents an experiment performed to demonstrate a particular aspect of photosynthesis. 12. (i) What is the object of the experiment ? (iii) Why was the plant kept in the dark before the experiment ? (iii) During the starch test why was the leaf: (1) boiled in water (2) boiled in methylated spirit. (2) Why would you select a destarched plant ? Water may be used inside the plant but O2 released into the atmosphere. (ii) Take a potted plant and keep it for 2-3 days in dark to destarch its leaves. (ii) Stroma lamellae. Question 28: List the events taking place in the photo-chemical phase of Photosynthesis. Answer: (i) The student is investigating the necessity of sunlight for photosynthesis. (True). (v). 8. Radiant energy is converted into chemical energy by photosynthesis. Answer: (i) (ii) Photo chemical phase of photosynthesis is light dependent. 3. (ii) Name the chemical used for testing the presence of starch. Adenosine Triphosphate 12. It is rinsed with hot water to remove alcohol and spread it on a white tile. (ii) Non-green plants such as saprophytes and parasites use the food prepared by green plants during photosynthesis as a source of their own nutrition. Answer: (i) Photosynthesis. Answer: (i) 1. Formation of ATP in the chioroplast in the presence of light is called photophosphorylation. Question 17: Explain, why respiration is said to be a reversed process of photosynthesis ? Question 8: Which tissues and cells are mainly concerned with photosynthesis ? After a few hours pluck the leaf and remove the black strips. Question 21: On a bright sunny day water weeds growing in an aquarium were actively giving off bubbles of.gas. The physiological process being studied is Photosynthesisii. Answer: See figure. Photosynthesis occurs only in plants. 10. (vi) The region of the leaf that was under the black strip turns yellowish-brown showing that no starch was made, while the rest of the leaf turns bluish-black showing the starch was made in the presence of light. (ii) Explain the process. Answer: Question 2: Stroma of chloroplast and Grana of chloroplast. (iv) The leaf is tested for presence of starch as follows: Question 26: A potted plant was taken in order to prove a factor necessary for photosynthesis. It is green flattened sac like structure. Leave it in the sunlight. CO2 is the life supporting gas produced due to photosynthesis. (False, It remains stored in it for 24 to 48 hours) 17. The hydroxyl ions combine to form hydrogen peroxide 2OH —> H2O2 which decompose to give molecular oxygen, i.e., 2H2O2 ——> 2H2O + O2 (iv). The process by which plants produce their food. The portion covered with black paper remains colourless while rest of the leaf turn blue black. Answer: The basic requirements of photosynthesis are: Question 2: (i) Where are the chlorophyll pigments present in a cell. 6. (True) 16. (Root) 2. Mushroom 10. 5.Photosystem Organization 6.Equation of photosynthesis 2. Photosynthesis and cellular respiration are essentially the reverses of one another where photosynthesis is an anabolic process resulting in the formation of organic molecules. Answer: The leaves of green plants are specially developed for the purpose of synthesizing food. (ii) What is the special condition inside the flask ? The raw materials for photosynthesis include water and CO2. 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