(True) 19. Question 10: How do non-green plants such as fungi and bacteria obtain their nourishment ? (iii) CaO (limestone), potassium pyrogollate. (v) The leaf is then washed in water and tested with iodine. Question 15: Why is it not possible to demonstrate respiration in a green plant kept in the sunlight ? (iii) If you are planning an experiment to show the effect of light on photosynthesis : (a) Will you select white light or green light ? c) photoinhibition (False, The unit of light absorbed by the chlorophyll during photosynthesis is the photon or quantum.) (False, Photosynthesis occurs in all green plants.) (iii) Leaf is boiled in water to kill the cells and boiled in alcohol to remove chlorophyll. Question 25: A candidate in order to study the importance of certain factors in photosynthesis took a potted plant and kept it in the dark for over 24 hours. But how do we know our plants are getting too much illumination? Question 7: State one important function of chloroplasts. (False, Transpiration occurs along with photosynthesis.) The process of light absorption consists of a sequence of photophysical and photochemical reactions that are subdivided into three stages: (i) light absorption, (ii) utilization of this energy to synthesize ATP and reducing power, reduced ferredoxin (Fd) and NADPH and (iii) absorption and reduction of atmospheric CO 2 into carbon skeleton. Water 5. (True) 10. It also has vitamins, antioxidants, and therapeutic properties that have the potential to benefit your body. It may be that absorbing all of that energy would be too much for the plant system to handle. Within the visible light spectrum, chlorophyll strongly absorbs red and blue light while reflecting green light 48. Some studies have suggested that people with blue eyes have the highest risk. Photosynthesis 7. 230-250 molecules of chlorophyll make one quantasome. for plant growth and development. (iii) During the starch test why was the leaf: (1) boiled in water (2) boiled in methylated spirit. Leave it in the sunlight. Answer: The chlorophyll traps solar energy and converts it into chemical energy. Question 8: Select the correct answer out of the available choices given under each question. (a) Loss of half of its branches (b) Loss of half of its flowers (c) Loss of all of its leaves (d) Loss of a little bark, 6. 4. Chlorophyll simply has not evolved to gather all wavelengths. Answer: The rate of photosynthesis decreases and finally stops when the green plant gets green light because green light is not absorbed but reflected back by the plant. The main reaction which means the breaking up of water molecules through light. Chlorophyll a has two light absorption pigments at around 440nm and 675nm. Oxygen is used in respiration whereas it is given out as a by-product in photosynthesis. 9. The hydroxyl ions combine to form hydrogen peroxide 2OH —> H2O2 which decompose to give molecular oxygen, i.e., 2H2O2 ——> 2H2O + O2 (iv). (ii) Name the membrane that connects thylakoid of one granum With the other granum. VIEW SOLUTION. What does NADP stand for ? Carbon dioxide is used directly in the process of photosynthesis. The conversion of physical energy of light into chemical energy by the chloroplast is called Photophosphorylation. Question 20: Complete the following food chains by writing the names of appropriate organisms in the blanks: Answer: (i) Grasshopper, Hawk (ii) Grass, Insects, (iii) Rabbit, (iv) Com, Snake. The likelihood that a photon will be absorbed depends upon the wavelength of the photon (the wavelength of the photons is what gives light its color). Answer: During the day, the chloroplast in the guard cells are able to carry on photosynthesis, so the osmotic pressure in the cell sap of the guard cells is high and water enters the guard cells which lead to an opening of the stomatal aperture. 9. Hence, we avoid water stress if we adjust the amount of light our crop receives. Iodine, Question: 1. 7. Starch 10. Stroma. Answer: The splitting of water molecule into two component ions by light is known as photolysis of water. The process of photosynthesis takes place in the dark. According to this law when a process is conditioned to its rapidity by a number of separate factors, the rate of process is limited by the pace of the lowest factor, i.e., the factor which is present in minimum amount. 1 Structures Expand this section. Too much light mainly serves to bleach out and destroy chlorophyll as opposed to causing leaf cupping, but it often goes hand-in-hand with high heat for indoor growers. Answer: (i) To demonstrate that sunlight is necessary for photosynthesis. (ii) Explain the process. it can destroy chlorophyll molecules. AIIP stands for Adenosine diphosphate. Its also pos… Besides growth, the molecules that plants need to photosynthesize are also affected by artificial light. 8. ... radicals, which are toxic to the coral. Indeed, African-Americans have a much lower risk of AMD than Caucasians. (ii) 1. Question 2: Photosynthesis is considered as a process supporting all life on earth. Question 12: What is meant by photolysis of water ? (v) What is the importance of the above phenomenon ? The chloroplasts are the actual sites of photosynthetic reactions-light and dark reactions which result in the formation of glucose. Photosynthesis 9. 84) High intensity light has a negative effect on photosynthesis; in fact, too much light can diminish photosynthetic output. In red-coloured light, the rate of photosynthesis is maximum whereas in green- coloured light photosynthesis does not occur. Both tasks require pigments—chlorophylls and carotenoids—which absorb light energy and either transfer it to photosystems or disperse it as heat. Worse yet, they start to grow all long and gangly. Question By default show hide Solutions. True or False. (b) This energy is used in splitting the water molecules (photolysis) as below : H2O —-> H+ + OH– (c) OH– ions through a series of steps produce water (H2O) and oxygen (O2). CO2 is the life supporting gas produced due to photosynthesis. It takes place in chlorophyll containing thylakoids of chloroplast. These herbicides can be applied Question 22: What is meant by destarched plant ? Form of energy which is converted into chemical energy during photosynthesis. 14. (iv) Give an overall balanced chemical equation to represent the process named in (i) above. (ii) Iodine solution. Calvin Cycle 3. NADP 10. (v). (ii) Oxygen. (c) Decreases because the temperature drops. The photosynthesis action spectrum specifically measures the metabolic rate, usually by CO2 usage, at each wavelength. (False, It takes place in the presence of sunlight.) Anthocyanin pigments are produced in the stems and leaves of the sun shoots. Answer: ATP and NADPH2 are called assimilatory power. It can be used to classify the trophic condition of a waterbody. ATP: Adenosine triphosphate, a small water soluble molecule that acts as an energy currency in cells. Chlorophyll absorbs photons unit of sunlight. This shows that the region which did not receive light could not synthesise starch. Answer: The tissues and cells which contain chloroplasts are mainly the palisade parenchyma and spongy mesophyll cells of a green leaf. Although algae are a natural part of freshwater ecosystems, too much algae can cause aesthetic problems such as green scums and bad odors, and can result in decreased levels of dissolved oxygen. There may also be a difference in the amounts of different pigments in the leaf. Question 3: Chlorophyll is necessary for photosynthesis. Answer: This process produces food and releases oxygen, both of which are necessary to maintain life on earth. (i) It fakes place in the presence of light. 4. (iv) Leaves are thin to allow rapid transport or diffusion of materials. Thus, it’s quite logical to predict that the concentration or the solidness of carbon dioxide also affects photosynthesis. Question 7: A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. Answer: (i) The student is investigating the necessity of sunlight for photosynthesis. During election transfer NADP get reduced and (rom NADP + H (NADPH2). Turn down the time when the lights on in your marijuana grow room. Too much light mainly serves to bleach out and destroy chlorophyll as opposed to causing leaf cupping, but it often goes hand-in-hand with high heat for indoor growers. (ii) Name the chemical used for testing the presence of starch. Mention, if the following statement is True or False. ... interacts with chlorophyll and carotenoids, another The world would be a very weird place if all of the trees and grass were black. Too much light doesn’t directly affect the moisture level in the plants but it goes hand in hand with high heat. Question 1: Light reaction and Dark reaction. It takes place is chlorophyll containing thylakoids of chloroplast. Chloroplasts are regarded as complete photosynthetic units of plants. (ii) List the events taking place in the photo-chemical phase of Photosynthesis. Photosynthesis 2. Answer: In respiration, energy is released as a result of oxidation of food, whereas in photosynthesis it is stored up in a carbohydrate molecule. Xylem 5. Answer: Take a destarched plant. Plants contain other pigments that reflect different colors, but these are often masked by Chlorophyll. 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