Photosynthesis: The physical-chemical process by which certain chlorophyll (containing organisms use light energy for the biosynthesis of organic molecules. Leaf 2, will turn blue black at the end of starch test. Thus we can say that oxygen liberated during photosynthesis comes from water. But studies are mixed about whether chlorophyll actually boosts health in these ways. False. 7. Photosynthesis 2. (ii) The special condition inside the flask is that there is no CO2 in the air as it has been absorbed by the KOH. 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. A light reaction is a Photochemical reaction. Pour iodine solution on it. what happens when there is too much light? 5. (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. (iii) The plant is kept in the dark before the experiment to destarch the leaves. H2 ———> H+ + OH–. Answer: Oxygen liberated during photosynthesis is a waste for the plant, so, it is released into air and is used by living organisms in respiration. (iii) Leaf is boiled in water to kill the cells and boiled in alcohol to remove chlorophyll. Nicotinamide Adenine Dinucleotide Phosphate 13. Question 1: Light reaction and Dark reaction. (False, It remains stored in it for 24 to 48 hours) 17. Turn down the time when the lights on in your marijuana grow room. The experiment showing that CO2 is necessary for photosynthesis. Blue and red light are used more efficiently in photosynthesis. (ii) Why was the plant placed in the dark before beginning the experiment ? Boil the leaf in alcohol and wash in water. (iv) In what manner do the leaves 1 and 2 differ at the end of the starch test ? Which would do maximum harm to a tree? If so, state the same. 9. 9. Answer: (i) In a dark room a leaf on the destarched plant is covered on either side with strips of black paper which is kept in place by paper clips or cellophane tape. Generally, light prevents growth in plants because it decomposes and destroys auxin hormone that is crucial for growth. 4. (ii) Now the potted plant is kept in light. Question 23: Using the destarched plant describe step by step how would you proceed to prove that in the absence of light the leaf cannot manufacture starch ? (iii) Name an alternative chemical that can be used instead of KOH. Answer: (i) Photosynthesis. (iv) In what way will the three leaves (A, B and C) differ at the end of the experiment, when tested with iodine solution? 4. A dark reaction is a Thermochemical reaction. (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). (ii) Identify the special condition inside the flask. Structures of the chlorophyll molecules. (b) Why would you select a destarched plant ? The potted plant was kept in the dark for 24 hours. 11. One of the leaves was covered with black paper in the centre. The green colouring matter of the plants. 14. (iii) Why is the leaf boiled in water and alcohol before testing for the presence of starch ? 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. 8. Chest pain will happen for many reasons but it can be a side effect of consuming too much chlorophyll. Too much light doesn’t directly affect the moisture level in the plants but it goes hand in hand with high heat. A variegated leaf (one that has green as well as white patches) will only photosynthesize in the green areas. If you're using a 24 hr cycle, turn it down to 20 hrs. 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. Question 22: What is meant by destarched plant ? Chlorophyll plays an important role in making plants green and healthy. Within the visible light spectrum, chlorophyll strongly absorbs red and blue light while reflecting green light 48. Answer: (i) A large surface area to absorb water. 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. A plant that does not perform photosynthesis is Fungus. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. (b) I will select destarched plant so I can demonstrate the synthesis of starch through iodine test. 5. If false rewrite the wrong statement in its correct form: 1. (False, Respiration occurs in all the cells of a plant.) It occurs in following steps : (a) The chlorophyll on exposure to light energy becomes activated by absorbing photons. Name the structure where photophosphorylation takes place. Question 5: A leaf is a food factory. This shows that the region which did not receive light could not synthesise starch. VIEW SOLUTION. How can it be destarched ? Question 1: All life on earth Would come to an end if there were no green plants. The primary differences between these t… (d) Decreases because water freezes. (e) Decreases because respiration decreases. 9. Chlorophyll simply has not evolved to gather all wavelengths. (True) 3. NADPH 5. (i) What aspect of photosynthesis was being tested ? Grana 6. 230-250 molecules of chlorophyll make one quantasome. (iii) Select the correct leaf from the five available choices shown in the diagram as A, B, C, D and E. Rewrite the correct answer for the filling in the appropriate letter from the questions that follow: 1. Mushroom 10. 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. (False, Photosynthesis occurs in all green plants.) Answer: (i) That light is necessary for photosynthesis. Cooking destroys much of the chlorophyll, which is why consumption of these green leaves and vegetables RAW is the best way to obtain the health benefits of chlorophyll. 4. By contrast, in sun leaves, the chloroplasts take turns in the bright light and then shelter in the shade of others whilst they make use of the light they have absorbed. After the starch test, leaf Y would look like. 4. Chlorophyll is a rich source of magnesium, vitamin A, vitamin C, vitamin E, vitamin K, amino acids, enzymes, and fatty acids. Question 21: On a bright sunny day water weeds growing in an aquarium were actively giving off bubbles of.gas. (iii) After a few hours, the leaf is detached from the plant and the black strips are removed. 3. The conversion of physical energy of light into chemical energy by the chloroplast is called Photophosphorylation. Leaves the Organs to Trap Solar Energy: Leaves contain chlorophyll which is a photoreceptor molecule. Thylakoids. 2. The unit of light absorbed by the chlorophyll during photosynthesis is the proton. 7. Question 8: Select the correct answer out of the available choices given under each question. It is rinsed with hot water to remove alcohol and spread it on a white tile. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. At the end of this time leaf X and leaf Y were tested for starch. Write the functional activity of the following structures: 1. A high energy reduced compound formed in the light reaction and enter into the dark reaction. Answer: Green plants manufacture food during the process of photosynthesis and give out oxygen a life supporting gas for all organisms. Chlorophyll absorbs the light required to convert carbon dioxide and water into glucose. 4. Thus, light is necessary for photosynthesis. 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. This energy is used in splitting the water molecules (photolysis) as below :- H 2 O ——> H + + OH – OH – ions through a series of steps produce water (H 2 O) and oxygen (O 2). (Photon) 3. Indeed, African-Americans have a much lower risk of AMD than Caucasians. 8. Answer: See figure. All the starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of plant. Name only one plant, you are familiar with which has no chlorophyll. Turn down the time when the lights on in your marijuana grow room. ... radicals, which are toxic to the coral. Name the tissue that transports manufactured starch from the leaves to all parts of the plant. Because most biochemical reactions occur at a constant temperature and pressure. Question: 1. You end up with stretchy plants because they’re literally reaching out for more light. A light induced reaction which leads to splitting of water is Photolysis of water. (Also known as the thylakoid membrane.) 2. The chloroplasts are the actual sites of photosynthetic reactions-light and dark reactions which result in the formation of glucose. Trendy juice shops sell chlorophyll water pre-bottled for upward of $9 a pop, but I went in search of liquid chlorophyll at Whole Foods in order to make my own at home. However, too much sunlight can damage chlorophyll, so carotenoid pigments are present to absorb this excess energy and protect chlorophyll. Answer: Respiration is a catabolic process while photosynthesis is an anabolic process. Always talk to your doctor before you take chlorophyll, or any herbs or supplements. Cyanuric acid doesn’t dissipate like chlorine, and can build up to very high levels over time. Question 28: List the events taking place in the photo-chemical phase of Photosynthesis. (True) 16. One of the product of Photolysis of water is oxygen. It gets water from the stem. Answer: The tissues and cells which contain chloroplasts are mainly the palisade parenchyma and spongy mesophyll cells of a green leaf. Some side effects include chest pain, skin disorders and even some breathing problems. This curve shows two peaks of more or less equal height in the far blue and far red, with a green trough dipping to 30%-60% of the peaks. (v) What is the importance of the above phenomenon ? Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. cofactor pigments that absorb light energy responsible for leaf color in fall contribute to human eye health. (True) 15. Question 4: Chloroplasts are called energy converters. NADP (Nicotinamide Adenine dinucleotide phosphate): It is a coenzyme. The process by which plants produce their food. (ii) How many veins have been shown. The hydroxyl ions combine to form hydrogen peroxide 2OH —> H2O2 which decompose to give molecular oxygen, i.e., 2H2O2 ——> 2H2O + O2 (iv). Keep in mind that all but equatorial material receive less light during flowering than during the vegetative stage. (True) 12. The apparatus was kept in sunlight for almost the whole day. When it comes to the seedling phase, many people believe that there is nothing such as ‘too much light’. (True) 18. It was then set up as shown in the diagram and exposed to light for about 12 hours. Source of oxygen given out in photosynthesis. 9. Moreover, too much light and ultra violet rays can destroy and damage chlorophyll in plants which are responsible for the photosynthesis reaction. Photosynthetic Membrane 8. Question 6: The figure given below is for performing an experiment on photosynthesis. it can destroy chlorophyll molecules. (True) 7. The site of light reaction in the cell of a leaf. 2. Chloroplast 3. NADPH2 8. (c) Decreases because the temperature drops. These red pigments help to protect the chlorophyll from excess ultra-violet radiation. 2. 4. 3. These herbicides can be applied preemergence or postemergence. We recommend replacing your pool water 25-30% at a time if the ORP level is higher than 30 ppm. Upper Epidermis 3. Now keep the potted plant in light. 8. Answer: Question 2: Draw a neat and well-labeled diagram of the apparatus you would set up to show that oxygen is given out during photosynthesis. False. While a little cyanuric acid is a good thing, too much can destroy a pool’s ORP. The alphabet ‘A’ represents a certain condition inside the flask. Adenosine Triphosphate 12. If phytoplankton are exposed to too much UV light, the excessive solar energy can break molecular bonds and destroy the organisms’ DNA 27. Worse yet, they start to grow all long and gangly. (iv) Light supplies eiergy in the form of photons to split water during tight reaction. Leaf B and Leaf C will turn blue-black. Answer: (i) Photosynthesis. Explain. Red 7. Question 11: “Oxygen is a waste product of photosynthesis.” Comment. Calvin cycle was proposed by Melvin Calvin. Beta carotene. (ii) What is the special condition inside the flask ? Mention, if the following statement is True or False. (iv) Give a well balanced equation to represent the process. Chlorophyll is split into two slightly different types: chlorophyll a and chlorophyll b. (iii) Why was the plant kept in the dark before the experiment ? (iv) Leaf A will be yellowish-white. 12. (d) Decreases because carbon dioxide acts as a limiting factor. Chlorophyll is a green pigment that gives most plants their color.The reason that it is green is because it absorbs other colors of light such as red and blue, so in a way the green light is reflected out since the pigment does not absorb it. If false rewrite the wrong statement in its correct form: Too much light destroys chlorophyll… Carbon dioxide is used directly in the process of photosynthesis. - Biology. Photosynthesis occurs only in plants. Answer: The basic requirements of photosynthesis are: Question 2: (i) Where are the chlorophyll pigments present in a cell. (iv) Write a balanced chemical equation to represent the process of photosynthesis. (iii) (a) 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. (i) What aspect of photosynthesis was being investigated ? Calvin Cycle: The biochemical reactions, initiated by Rubisco, that result in the reduction of CO2 to a carbohydrate (also known as the photosynthetic carbon reduction cycle). (False, Photosynthesis results in gain of dry weight of the plant.) The main reaction which means the breaking up of water molecules through light. (Carbon-di-oxide) 4. Answer: A destarched plant has no starch present in the leaves and a leaf remains yellowish-brown when tested with iodine during a starch test. The chlorophyll on exposure to light energy becomes activated by absorbing photons. Grana, Thylakoid, Stroma, Root. (iii) (1) To kill the cells. Answer: (i) 1. In red-coloured light, the rate of photosynthesis is maximum whereas in green- coloured light photosynthesis does not occur. I think its too simplistic to say red light is for growth and blue/UV for phototropism. Answer: ATP and NADPH2 are called assimilatory power. (v) Give the chemical equation to represent the process of starch formation in plants. (2) I will select destarched plant so I Can demonstrate the synthesis of starch through iodine test. The leaf which was exposed to the atmospheric air becomes blue black, and the one in the flask containing KOH does not become blue black after iodine test. 4OH ——> 2H2O + O2, Mention, if the following statements are True or False. AIIP stands for Adenosine diphosphate. 3. The numeral ‘1’ represents a certain condition inside the flask and the numeral ‘2’ represents a chemical responsible for this condition. (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. Question 2: (i) Identify the above diagram. The leaf was then tested for starch. (False, Transpiration occurs along with photosynthesis.) CO2 is the life supporting gas produced due to photosynthesis. These herbicides can be applied A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to: (a) Remove starch from the plant (b) Ensure that starch is not translocated from the leaves (c) Remove chlorophyll from the leaf of the plant (d) Remove starch from the experimental leaf, 8. APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 5 Photosynthesis for ICSE Board Examinations. Answer: During the process of photolysis under light reaction the water molecule split up to release H+ and OH– ions. 10. Only Chlorophyll a is directly involved in the light reactions of photosynthesis. True & False | Q 4. Answer: When a plant is kept in sunlight, CO2 released by respiration gets used by photosynthesis to synthesize food. By absorbing colors that chlorophyll a cannot absorb, the accessory pigments enable plants to capture more of the energy in light. for plant growth and development. If it did absorb all wavelengths, then all plant life would be BLACK. Chlorophyll b assists Chlorophyll a in capturing light energy and is called an accessory pigment. 14. Too much light destroys chlorophyll. Xylem 5. If False Rewrite the Wrong Statement in Its Correct Form: Too Much Light Destroys Chlorophyll. In sun leaves, most of the chloroplasts are found in the palisade layer. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. Photosynthesis 2. The chloroplasts are evenly distributed between the palisade and spongy mesophyll layers. Anthocyanin pigments are produced in the stems and leaves of the sun shoots. A cell that lacks chioroplast does not: (a) Evolve carbon dioxide (b) Liberate oxygen (c) Require water (d) Utilize carbohydrates, 5. The world would be a very weird place if all of the trees and grass were black. True & False | Q 3. what do cells do in excess light? Which process is the ultimate source of energy for all living organisms ? Carbon dioxide is used directly in the process of photosynthesis. The physical reaction of light with chlorophyll Plants contain two types of chlorophyll, chlorophyll-a (chl-a) and chlorophyll-b (chl-b). Plastoquinone 6. Chlorophyll a has two light absorption pigments at around 440nm and 675nm. Both tasks require pigments—chlorophylls and carotenoids—which absorb light energy and either transfer it to photosystems or disperse it as heat. 6. The portion covered with black paper remains colourless while rest of the leaf turn blue black. These red pigments help to protect the chlorophyll from excess ultra-violet radiation. MCQ. Phloem 11. Answer: Question 4: Autotrophs and Heterotrophs. The greener the vegetable, the more chlorophyll, so spirulina, chlorella, wheat grass, and leafy greens like spinach and watercress are excellent sources, though cooking destroys the chlorophyll. Question 3: The figure given below represents an experiment to demonstrate a particular aspect of photosynthesis. Out of nine types of chlorophyll, chlorophyll ‘a’ and ‘b’ are most abundant. blue light can kill plants because the light is too dark for plants to absorb. NADPH: Reduced form of nicotinamide ademne dinucleotide phosphate, a small water soluble molecule that acts as a hydrogen carrier in biochemical reactions. 10. Thus, having the right light intensity is essential to ensure your crop is successful. (iii) Briefly describe the reactions occurring in the leaves of the water weeds leading to the evolution of these bubbles. (True) 8. Glucose, Water, Oxygen, Carbon-dioxide. Insert one of its leaves in a conical flask, which contains potassium hydroxide. (i) From the graph it seems likely that the rate of bubbling per minute at 50 cm., would have been : (a) 2-0 (b) 2-5 (c) 3-0 (d) 3-5 (e) 4-0, (ii) The gas produced by the plant during the experiment was : (a) Air (b) Oxygen (c) Carbon dioxide (d) Nitrogen (e) Hydrogen, (iii) The gas collected comes due to the breakdown of: (a) Glucose (b) Starch (c) Water (d) Air (e) ATP. Heterotrophs 7. Pigment-inhibiting herbicides act by blocking the formation of carotenoids so that light energy from the sun destroys chlorophyll. Turn down the time when the lights on in your marijuana grow room. Justify your answer. Question By default show hide Solutions. These photons drive a series of reactions that produce sugar molecules, allowing plants to store energy for later use. MeSH. Stroma 14. (ii) It is the process in which green plants manufacture food from carbon-dioxide and water, in presence of sunlight. (ii) Stroma lamellae. Use this information to answer questions that follow : (i) Name the process occurring in the water weed that has resulted in evolution of these bubbles. 6. Oxygen is used in respiration whereas it is given out as a by-product in photosynthesis. Iodine, Question: 1. Palisade tissue/chioroplast 4. Question 3: Give some adaptations in a green leaf for photosynthesis. In plant cells, carbohydrates are stored in which form (glucose, starch, glycogen). During photosynthesis, specialized proteins known as light-harvesting complexes, with the help of pigments such as chlorophyll, absorb light energy in the form of photons. This is because the plant absorbs too much energy and destroys itself. Question 8: Which tissues and cells are mainly concerned with photosynthesis ? 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. These light green hues are easily removed without the more involved and extreme measures that I will follow up with, and is as simple as putting a jar of the oil suspended in an ethanol tincture, in sunlight or a light from a high UV source, like a grow lamp. The Effects of Sunlight on Bean Plants. (iv) What change is seen on the leaf after the starch test ? Chlorophyll a is a measure of the amount of algae growing in a waterbody. Answer: Question 3: Chloroplast and Chlorophyll. Chlorophyll can help strengthen your bones and improve bad breath, but it can have some side effects. Carbon cycle. KOH absorbs CO2. Question 7: State one important function of chloroplasts. Answer: (i) Chlorophyll is necessary for photosynthesis. Answer: In respiration, energy is released as a result of oxidation of food, whereas in photosynthesis it is stored up in a carbohydrate molecule. (iii) If you are planning an experiment to show the effect of light on photosynthesis : (a) Will you select white light or green light ? Too much light mainly serves to bleach out and destroy chlorophyll as opposed to causing marijuana leaf cupping, but it often goes hand-in-hand with high heat for indoor marijuana growers. VIEW SOLUTION. (iii) CaO (limestone), potassium pyrogollate. Chlorophyll simply has not evolved to gather all wavelengths. If it did absorb all wavelengths, then all plant life would be BLACK. With too little light they are unable to produce chlorophyll. Answer: Chloroplast contains chlorophyll which is used to trap the solar energy from the sunlight which falls on the leaf. Photosynthesis can also occur n artifidal light such as that of a 100 watt electric lamp. Formation of ATP in the chioroplast in the presence of light is called photophosphorylation. If false rewrite the wrong statement in its correct form: Concept: The Internal Structure of Chloroplast, CBSE Previous Year Question Paper With Solution for Class 12 Arts, CBSE Previous Year Question Paper With Solution for Class 12 Commerce, CBSE Previous Year Question Paper With Solution for Class 12 Science, CBSE Previous Year Question Paper With Solution for Class 10, Maharashtra State Board Previous Year Question Paper With Solution for Class 12 Arts, Maharashtra State Board Previous Year Question Paper With Solution for Class 12 Commerce, Maharashtra State Board Previous Year Question Paper With Solution for Class 12 Science, Maharashtra State Board Previous Year Question Paper With Solution for Class 10, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 12 Arts, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 12 Commerce, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 12 Science, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 10. 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