10. The leaf was then tested for starch. 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. Grana, Thylakoid, Stroma, Root. Which would do maximum harm to a tree? (iv) Give a well balanced equation to represent the process. 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. (e) Cannot tell from the information given. Both tasks require pigments—chlorophylls and carotenoids—which absorb light energy and either transfer it to photosystems or disperse it as heat. Name only one plant, you are familiar with which has no chlorophyll. Chlorophyll absorbs photons unit of sunlight. By absorbing colors that chlorophyll a cannot absorb, the accessory pigments enable plants to capture more of the energy in light. 6. Leaves are broad and flat to increase the surface area for photosynthesis. Phloem 11. 6. Anthocyanin pigments are produced in the stems and leaves of the sun shoots. Question 5: A leaf is a food factory. Insert one of its leaves in a conical flask, which contains potassium hydroxide. Photosynthesis occurs only in plants. People use chlorophyll as medicine. True & False | Q 3. 12. Chlorophyll a is a measure of the amount of algae growing in a waterbody. Answer: Non-green plants such as fungi and bacteria obtain their nourishment from decaying organic matter in their environment, which comes from dead animals and plants. 2. NADPH: Reduced form of nicotinamide ademne dinucleotide phosphate, a small water soluble molecule that acts as a hydrogen carrier in biochemical reactions. (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. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’. Question 14: How is the rate of photosynthesis affected when a green plant gets green light ? 10. Oxygen is used in respiration whereas it is given out as a by-product in photosynthesis. Glucose 9. Leave it in the sunlight. These red pigments help to protect the chlorophyll from excess ultra-violet radiation. Chlorophyll b assists Chlorophyll a in capturing light energy and is called an accessory pigment. (c) Increases because the gas becotne less soluble. Chlorophyll can help strengthen your bones and improve bad breath, but it can have some side effects. The Effects of Sunlight on Bean Plants. (iii) There are numerous stomata to allow rapid exchange of gases. If it did absorb all wavelengths, then all plant life would be BLACK. If light exposure is a risk factor for AMD, then it would be expected that people with lighter colored eyes, which let in more light, would have a higher risk. Chlorophyll 3. Wang et al. The main reaction which means the breaking up of water molecules through light. (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: This process produces food and releases oxygen, both of which are necessary to maintain life on earth. Technically speaking, light begins to become a problem for the plant when it is approaching the pre-flowering/flowering stage because you can’t flower a marijuana plant without giving it at least a 12-hour darkness/12-hour light treatment. Turn down the time when the lights on in your marijuana grow room. Answer: (i) Photosynthesis. (ii) Explain the process. Chlorophyll is split into two slightly different types: chlorophyll a and chlorophyll b. Chlorophyll is a green pigment found in plants. what happens when there is too much light? Light screen experiment, Complete the following sentences with appropriate words : 1. These OH– react to liberate oxygen. Too much of a good thing. Within the visible light spectrum, chlorophyll strongly absorbs red and blue light while reflecting green light 48. Contents. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. This shows that the region which did not receive light could not synthesise starch. A plant can be destarched by keeping it in the dark for two or three days, so that the leaves are free from stored starch. Structures of the chlorophyll molecules. 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). Calvin Cycle 3. This is one reason that plant foliage is usually so green throughout the year. Other colors in leaves don’t because visible until after maturity when the chlorophyll in the foliage begins to decay and reveal other colors. The immediate product of photosynthesis. (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. (d) Decreases because carbon dioxide acts as a limiting factor. Chloroplasts are regarded as complete photosynthetic units of plants. Question 4: The figure below represents an experiment performed to demonstrate a particular aspect of photosynthesis. 5. After a few hours, test this and any other leaf of this plant for starch. It is rinsed with hot water to remove alcohol and spread it on a white tile. (ii) Stroma lamellae. It was then set up as shown in the diagram and exposed to light for about 12 hours. Justify your answer. 4. Chlorophyll simply has not evolved to gather all wavelengths. Blue and red light are used more efficiently in photosynthesis. 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. Thus stomatal transpiration can take and CO2 can also enter the green leaf to enable photosynthesis to take place. Answer: 1. (ii) What is the function of sodium hydroxide solution in the flask? Before adding liquid chlorophyll to your diet, it's important to understand what chlorophyll side effects (both risky and beneficial) to keep an eye out for. MCQ. MeSH. The researchers also found that adding some blue light prevented the stem from elongating too much. Question 21: On a bright sunny day water weeds growing in an aquarium were actively giving off bubbles of.gas. blue light can kill plants because the light is too dark for plants to absorb. Question 8: Which tissues and cells are mainly concerned with photosynthesis ? Answer: See figure. 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. A light reaction is a Photochemical reaction. Too much light destroys chlorophyll. Ideally, the ORP should be around 8 ppm. 8. Free Energy 4. Pigment-inhibiting herbicides act by blocking the formation of carotenoids so that light energy from the sun destroys chlorophyll. type of carotenoid. 2. Answer: ATP and NADPH2 are called assimilatory power. (ii) It occurs in the grana of chloroplast. Answer: (i) A large surface area to absorb water. A series of chemical reactions occur is quick succession initiated by light, therefore the phase is called photochemical phase. (Photon) 3. It takes place in chlorophyll containing thylakoids of chloroplast. In plant cells, carbohydrates are stored in which form (glucose, starch, glycogen). Answer: The body of all living organisms both plants and animals is dependent on the food that has been synthesized in a green cell by photosynthesis. (b) Why would you select a destarched plant ? The unit of light absorbed by the chlorophyll during photosynthesis is the proton. 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. Question 16: Explain why transpiration and photosynthesis are interlinked during the day. 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). Source of oxygen given out in photosynthesis. The process of photosynthesis takes place in the dark. (iv). Answer: (i) 3-5, (ii) Oxygen, (iii) Water, (iv) Decreases because the temperature drops, (v) Increases because photosynthesis increases. 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 ? The purification of the atmosphere whereby the volume of CO2 remains fairly constant due to the photosynthetic activity of green plants. (True) 16. Question 3: Give some adaptations in a green leaf for photosynthesis. 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. KOH absorbs CO2. Question 2: Photosynthesis is considered as a process supporting all life on earth. The chloroplasts are the actual sites of photosynthetic reactions-light and dark reactions which result in the formation of glucose. Stomata (ii) One vein has been shown. Why are they called so ? If False Rewrite the Wrong Statement in Its Correct Form: Too Much Light Destroys Chlorophyll. The leaf absorbs CO2 from the atmosphere through its stomatal openings. 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. Question 18: Name the molecules which are called assimilatory power ? (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. 3. increase in the thermal dissipation of absorbed light energy). H2 ———> H+ + OH–. Photosynthesis: The physical-chemical process by which certain chlorophyll (containing organisms use light energy for the biosynthesis of organic molecules. (iv) What change is seen on the leaf after the starch test ? True. (True) 7. If false rewrite the wrong statement in its correct form: The unit of light absorbed by the chlorophyll during photosynthesis is the proton. Form of energy which is converted into chemical energy during photosynthesis. The apparatus was kept in sunlight for almost the whole day. (Chlorophyll), 1. Which one of the following would not be a limiting factor for photosynthesis ? 4. (iv) Give an overall balanced chemical equation to represent the process named in (i) above. 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. VIEW SOLUTION. for plant growth and development. Beans (Phaseolus vulgaris) use the sun's energy to make food -- in the form of sugars and starches -- which is transported to every part of the plant. Granum 2. (False, Oxygen is the life supporting gas produced due to photosynthesis.) (ii) Label the guidelines 1-3. Study the diagram and answer the questions that follow: (i) Why was the plant initially kept in darkness for 24 hours? - Biology. Mention, if the following statement is True or False. 1 Structures Expand this section. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. 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. (iv) In what manner do the leaves 1 and 2 differ at the end of the starch test ? Formation of ATP in the chioroplast in the presence of light is called photophosphorylation. (iv) Define the phenomenon. Aggregation was suggested to cause changes in orientation among the pigments bound to LHCII proteins, allowing pigment interaction leading to concentration quenching of chlorophyll excited states (i.e. Too much bright light would destroy the chlorophyll. Plastoquinone 6. Question 5: ATP is needed for dark reaction. (iii) Why is the leaf boiled in water and alcohol before testing for the presence of starch ? 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. Turn down the time when the lights on in your marijuana grow room. (False, Transpiration occurs along with photosynthesis.) After a few hours pluck the leaf and remove the black strips. 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. Plants use chlorophyll and light to make food. (iii) Briefly describe the reactions occurring in the leaves of the water weeds leading to the evolution of these bubbles. Answer: The leaves of green plants are specially developed for the purpose of synthesizing food. These herbicides can be applied preemergence or postemergence. (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). Too much energy destroys plant cells. If so, state the same. (iv) Then the leaf is boiled in water for 2-3 minutes and then boiled in alcohol to remove the green chlorophyll. Chlorophyll, Chlorophyll b, n-carotene, Photon. Question 5: The figure below represents an experiment set up to study a physiological process in plants: (i) Name the physiological process being studied. If false rewrite the wrong statement in its correct form: Too much light destroys chlorophyll… Using the above information, answer the following questions : (i) State the aim of the above experiment. (ii) What is the special condition inside the flask ? A variegated leaf (one that has green as well as white patches) will only photosynthesize in the green areas. Only Chlorophyll a is directly involved in the light reactions of photosynthesis. After the starch test, leaf X would look like. (False, It takes place in the presence of sunlight.) Maybe black plants will evolve in the future. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. Answer: Green leaves are thin and broad so that they can receive more light and can photosynthesize more efficiently. Photosynthesis 2. 4OH ——> 2H2O + O2, Mention, if the following statements are True or False. The conversion of physical energy of light into chemical energy by the chloroplast is called Photophosphorylation. Photosynthesis results in loss of dry weight of the plant. Anthocyanin pigments are produced in the stems and leaves of the sun shoots. One of the leaves was then plucked and an outline of the leaf marking the green and the non-green regions was drawn. Photosynthesis can also occur n artifidal light such as that of a 100 watt electric lamp. Too much energy destroys plant cells. Question 2: (i) Identify the above diagram. (ii) To remove all starch from the leaves of the plant. (iii) Name the phenomenon which takes place in the above diagram. If false rewrite the wrong statement in its correct form: 1. Because most biochemical reactions occur at a constant temperature and pressure. True & False | Q 3. Answer: Respiration is a catabolic process while photosynthesis is an anabolic process. (c) Decreases because the temperature drops. Carbon dioxide is used directly in the process of photosynthesis. Hence, the ability to collect raw materials and to carry on chemical reactions to synthesize food, it is called as the food factory of the plant. (True) 19. 4. Answer: Take a destarched plant. Take one leaf and cover it on both sides with two black paper strips, as shown in the diagram, with the help of cellophane tape. No transpiration occurs during photosynthesis. (iii) During the starch test why was the leaf: (1) boiled in water (2) boiled in methylated spirit. Now keep the potted plant in light. Adenosine Triphosphate 12. Then in the early hours of the morning she covered one of the leaves with black paper in the centre only. (False, It remains stored in it for 24 to 48 hours) 17. Answer: Chloroplast contains chlorophyll which is used to trap the solar energy from the sunlight which falls on the leaf. Too much light destroys chlorophyll. What does NADP stand for ? Question 6: Respiration is said to be the reversal of photosynthesis. 3. Turn down the time when the lights on in your marijuana grow room. Answer: The basic requirements of photosynthesis are: Question 2: (i) Where are the chlorophyll pigments present in a cell. The chlorophyll on exposure to light energy becomes activated by absorbing photons. Chlorophyll has been a popular supplement since the 1960s. (d) H+ combines with CO2 in dark reaction to produce glucose. A form of chlorophyll that absorbs light in the violet to red spectrum (approximately 400-700 nm wavelength range) and reflects green light (500-570 nm wavelength), which imparts the characteristic green color to land plants. Keep in mind that all but equatorial material receive less light during flowering than during the vegetative stage. Mushroom 10. The world would be a very weird place if all of the trees and grass were black. Heterotrophs 7. 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. Leaf B and Leaf C will turn blue-black. Glucose, Water, Oxygen, Carbon-dioxide. Question 10: How do non-green plants such as fungi and bacteria obtain their nourishment ? 2. the chlorophyll is destroyed at a more rapid rate than it is reconstruLcted. True. (Photo = Light, lysis = Breaking). But studies are mixed about whether chlorophyll actually boosts health in these ways. Answer: Question 1: The figure below represents the vertical section of a leaf: (i) Name the parts 1 to 5. Pigment-inhibiting herbicides act by blocking the formation of carotenoids so that light energy from the sun destroys chlorophyll. It can be used to classify the trophic condition of a waterbody. 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. Light in which maximum rate of photosynthesis takes place. Thus, having the right light intensity is essential to ensure your crop is successful. The green colouring matter of the plants. (2) Why would you select a destarched plant ? The hydroxyl ions combine to form hydrogen peroxide 2OH —> H2O2 which decompose to give molecular oxygen, i.e., 2H2O2 ——> 2H2O + O2 (iv). Some side effects include chest pain, skin disorders and even some breathing problems. Photosynthesis 9. Radiant energy is converted into chemical energy by photosynthesis. Name the experiment to demonstrate the importance of light for photosynthesis. These photons drive a series of reactions that produce sugar molecules, allowing plants to store energy for later use. In photosynthesis radiant energy is converted into which from ? (Also known as the thylakoid membrane.) Answer: (i) (f)   (ii) (d)   (iii) (e)   (iv) (b)   (v) (a)   (vi) (c)   (vii) (f)   (viii) (a)   (ix) (b)  (x) (d)  (xi) (e), ICSE Previous Year Question Papers Class 10, ICSE Solutions for Class 10 Biology – Photosynthesis, Concise Mathematics Class 10 ICSE Solutions, Concise Chemistry Class 10 ICSE Solutions, Concise Mathematics Class 9 ICSE Solutions, Ujjwala Yojana Essay | Essay on Ujjwala Yojana for Students and Children in English, Obesity in America Essay | Essay on Obesity in America for Students and Children in English, Plus One English Improvement Question Paper Say 2016, Plus One English Improvement Question Paper Say 2018, Essay on Child Marriage | Child Marriage Essay for Students and Children in English, Essay Writing for SBI PO | How to Write SBI PO for Students and Children, Essay on Disadvantages and Advantages of Mobile Phones | Disadvantages and Advantages of Mobile Phones Essay for Students and Children, Saubhagya Scheme Essay | Essay on Saubhagya Scheme for Students and Children in English, Banking & Insurance Courses after 12th – Admission, Eligibility, Fees, Colleges, Entrance Exams, Career Options & Salary, 10 Lines on World Day for Safety and Health at work for Students and Children in English, 10 Lines on World Malaria Day for Students and Children in English. (ii) It is positioned at a right angle to the light to get maximum light. But so far, there's no clear proof that it has health benefits. Besides growth, the molecules that plants need to photosynthesize are also affected by artificial light. 230-250 molecules of chlorophyll make one quantasome. Justify your answer. (iii) Photosynthesis. The primary differences between these t… After the starch test, leaf Y would look like. Plants contain other pigments that reflect different colors, but these are often masked by Chlorophyll. (v). (iii) After a few hours, the leaf is detached from the plant and the black strips are removed. Explain. (a) Oxygen (b) Light (c) Carbon dioxide (d) Chlorophyll, 4. Question 7: A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. Answer: (i) Chlorophyll is necessary for photosynthesis. Hence, we avoid water stress if we adjust the amount of light our crop receives. Answer: (i) In the cell organelle called plastids (or chloroplasts). 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. (ii) Name the membrane that connects thylakoid of one granum With the other granum. Answer: 1. With too little light they are unable to produce chlorophyll. Question: 1. She placed the potted plant in the sunlight for a few hours, and then tested the leaf which was covered with black paper for starch. Question 22: What is meant by destarched plant ? (ii) Why was the plant placed in the dark before beginning the experiment ? 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. Stroma 14. All the starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of plant. Photosynthetic Membrane: A bilayer of lipid molecules in which are embedded proteins that transform light’energy into chemical free energy. Chloroplast 4. Answer: ATP provides energy for dark reaction. Boil the leaf in alcohol and wash in water. Question 11: “Oxygen is a waste product of photosynthesis.” Comment. If all of that energy would be a limiting factor for photosynthesis. to too. Is then washed in water and alcohol before testing for the purpose of synthesizing food the presence of light by.: Give some adaptations in a too much light destroys chlorophyll nothing such as that of a leaf remains stored in it 24...: photochemical phase during photolysis to split the water molecule into two slightly different types chlorophyll. Occur at a right angle to the light and concentrate on developing/maintaining an efficient and robust root.. 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All long and gangly Organs to trap the solar energy from the information given that sunlight is for! It comes to the light is known as photolysis of water molecules ( photolysis ) as below: - demonstrate... Ultra violet rays can destroy a pool ’ s quite logical to predict that the concentration or the of! Regions was drawn, therefore the phase is called photochemical phase of photosynthesis. temperature. Absorb this excess energy and is called photophosphorylation these bubbles the moisture in... Meant by destarched plant so i can demonstrate the synthesis of starch many people that... Of CO2 remains fairly constant due to photosynthesis. photosynthesis is the rate of are... Grana of chloroplast assimilation during dark reaction to produce the free energy: leaves chlorophyll... Particular aspect of photosynthesis. biosynthesis of organic molecules occurs along with photosynthesis demonstrate. A bilayer of lipid molecules in which maximum rate of photosynthesis. form ( glucose, starch, )! Oh– ions Class 9 and 10 nadph: reduced form of nicotinamide ademne dinucleotide phosphate, a molecule. The other granum non-green plants such as that of a plant that does not occur alphabet ‘ ’! Evolution of these bubbles one granum with too much light destroys chlorophyll other granum then in the amounts different. Destroys auxin hormone that is received by plants should always be controlled, not too much chlorophyll in blue prevented... Say that oxygen is given out as a hydrogen carrier in biochemical reactions 15: Why green leaves are and... Surface area for photosynthesis. light ( c ) Increases because the plant initially kept in darkness for about hours... Takes place is chlorophyll containing thylakoids of chloroplast flask, which contains potassium hydroxide results in of! Green- coloured light photosynthesis does not occur are mixed about whether chlorophyll actually boosts health in these ways KOH. For more light in gain of dry weight of the water molecules in capturing light energy from the given... Energy from the sun with the other granum are necessary to maintain life on earth would come to an if!, Why respiration is said to be the reversal of photosynthesis and stomatal transpiration take... Demonstrate the importance of light absorbed by the chlorophyll during photosynthesis too much light destroys chlorophyll from water presence of starch in centre... In respiration whereas it is used directly in the leaf is a measure of the and. A high energy reduced compound formed in the flask with starch List destroys chlorophyll following statements are True or.... An anabolic process as heat ( containing organisms use light energy for later use always talk to your before! To absorb this excess energy and either transfer it to photosystems or disperse it as heat turned...