Source of oxygen given out in photosynthesis. 6. Name the process which is responsible for conversion of solar energy to chemical energy that is essential to sustain the life on this earth ? (iii) The process that takes place first in the photolysis of water is H+ and OH- ions with the help of energy from sunlight. Question 4: The figure below represents an experiment performed to demonstrate a particular aspect of photosynthesis. 11. Photosynthetic Membrane 8. Although cooking makes food softer and easier to digest for people with digestive problems, however, in the process of heating, most essential vitamins and enzymes in the food get destroyed. Answer: (i) To demonstrate that sunlight is necessary for photosynthesis. In sun leaves, most of the chloroplasts are found in the palisade layer. The leaf was then tested for starch. Turn down the time when the lights on in your marijuana grow room. Answer: The leaves of green plants are specially developed for the purpose of synthesizing food. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. AIIP stands for Adenosine diphosphate. NADPH 5. These herbicides can be applied preemergence or postemergence. Chest pain will happen for many reasons but it can be a side effect of consuming too much chlorophyll. Question 3: The figure given below represents an experiment to demonstrate a particular aspect of photosynthesis. Name only one plant, you are familiar with which has no chlorophyll. Chlorophyll has been a popular supplement since the 1960s. 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. Chlorophyll b assists Chlorophyll a in capturing light energy and is called an accessory pigment. Photosynthesis 2. True & False | Q 3. These red pigments help to protect the chlorophyll from excess ultra-violet radiation. 9. CO2 is the life supporting gas produced due to photosynthesis. The leaf turns blue all over except the region covered with black strips. 0.03-0.04% 6. Because chlorophyll molecules are very good at soaking up blue and red light — but not so good at absorbing green light — plants containing a lot of chlorophyll appear green to the human eye. Chlorophyll absorbs the light required to convert carbon dioxide and water into glucose. If you're using a 24 hr cycle, turn it down to 20 hrs. Chloroplast 3. Each pigment molecule can absorb a single photon of light. 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. One of the product of Photolysis of water is oxygen. Thus we can say that oxygen liberated during photosynthesis comes from water. Insert one of its leaves in a conical flask, which contains potassium hydroxide. (False, It remains stored in it for 24 to 48 hours) 17. (False, The unit of light absorbed by the chlorophyll during photosynthesis is the photon or quantum.) Answer: During the process of photolysis under light reaction the water molecule split up to release H+ and OH– ions. (iv) Leaf 1, no change in colour with starch list. The portion covered with black paper remains colourless while rest of the leaf turn blue black. ATP: Adenosine triphosphate, a small water soluble molecule that acts as an energy currency in cells. (True) 10. Too much bright light would destroy the chlorophyll. 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. The leaf is boiled with alcohol over a water bath till it becomes colourless. Test the leaf for starch with iodine solution. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. 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. Compensation point means the condition: (a) When the entire food manufactured in photosynthesis remains unutilised (b) When the pot is watered just to meet the full requirement of the plant (c) When rate of photosynthesis is equal to rate of respiration (d) Where there is neither photosynthesis nor respiration. Accessory Pigments. Answer: The tissues and cells which contain chloroplasts are mainly the palisade parenchyma and spongy mesophyll cells of a green leaf. Too much bright light would destroy the chlorophyll. It is green flattened sac like structure. However, too much sunlight can damage chlorophyll, so carotenoid pigments are present to absorb this excess energy and protect chlorophyll. 4. Answer: Question 4: Autotrophs and Heterotrophs. It is essential for oxygenic PHOTOSYNTHESIS. Cyanuric acid doesn’t dissipate like chlorine, and can build up to very high levels over time. Calvin Cycle 3. 13. 2. (ii) Of what gas do these bubbles consist ? Answer: Question 2: Stroma of chloroplast and Grana of chloroplast. (b) Increases because more photosynthesis occurs. Answer: Take a destarched plant. Question 8: Which tissues and cells are mainly concerned with photosynthesis ? (False, Photosynthesis results in gain of dry weight of the plant.) 5. These red pigments help to protect the chlorophyll from excess ultra-violet radiation. 10. Carbon dioxide is used directly in the process of photosynthesis. Both tasks require pigments—chlorophylls and carotenoids—which absorb light energy and either transfer it to photosystems or disperse it as heat. The purification of the atmosphere whereby the volume of CO2 remains fairly constant due to the photosynthetic activity of green plants. Hence, we avoid water stress if we adjust the amount of light our crop receives. It may be that absorbing all of that energy would be too much for the plant system to handle. 8. Question 10: How do non-green plants such as fungi and bacteria obtain their nourishment ? 1 Structures Expand this section. We recommend replacing your pool water 25-30% at a time if the ORP level is higher than 30 ppm. (ii) To remove all starch from the leaves of the plant. 2 Names and Identifiers Expand this section. 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. 4. The immediate product of photosynthesis. (b) Increase because more water is added. Turn down the time when the lights on in your marijuana grow room. (iii) What do you conclude from this experiment? If phytoplankton are exposed to too much UV light, the excessive solar energy can break molecular bonds and destroy the organisms’ DNA 27. Explain this statement. (iii) After a few hours, the leaf is detached from the plant and the black strips are removed. The apparatus was kept in sunlight for almost the whole day. (ii) Describe an experiment to show that light is necessary for photosynthesis. 5. The raw materials for photosynthesis include water and CO2. Question 22: What is meant by destarched plant ? 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. Too much of a good thing. 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. 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. Iodine, Question: 1. (i) It fakes place in the presence of light. With too little light they are unable to produce chlorophyll. The conversion of physical energy of light into chemical energy by the chloroplast is called Photophosphorylation. 4. Answer: ATP provides energy for dark reaction. (i) What is the object of the experiment ? 4. ... interacts with chlorophyll and carotenoids, another Answer: Respiration is a catabolic process while photosynthesis is an anabolic process. If false rewrite the wrong statement in its correct form: 1. (True). Too much of a good thing. Justify your answer. 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. 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. After a few hours, test this and any other leaf of this plant for starch. 12. Blue and red light are used more efficiently in photosynthesis. How can it be destarched ? Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. Ideally, the ORP should be around 8 ppm. Why are they called so ? The photosynthesis action spectrum specifically measures the metabolic rate, usually by CO2 usage, at each wavelength. Figure 1. This energy is used in splitting the water molecules (photolysis) as below :-. Answer: Chloroplast contains chlorophyll which is used to trap the solar energy from the sunlight which falls on the leaf. (iii) Why is the leaf boiled in water and alcohol before testing for the presence of starch ? Mention, if the following statement is True or False. Light intensity, Water content, Temperature, Chlorophyll. (iii) Why was the plant kept in the dark before the experiment ? It also has vitamins, antioxidants, and therapeutic properties that have the potential to benefit your body. 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. If false rewrite the wrong statement in its correct form: The unit of light absorbed by the chlorophyll during photosynthesis is the proton. It may be that absorbing all of that energy would be too much for the plant system to handle. Leave it in the sunlight. Question 28: List the events taking place in the photo-chemical phase of Photosynthesis. (True) 19. Question 19: What is the law of limiting factor ? Chlorophyll is a green pigment found in plants. 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). (ii) No CO2 in the flask. VIEW SOLUTION. Chlorophyll a has two light absorption pigments at around 440nm and 675nm. Structures of the chlorophyll molecules. Concentration of Carbon Dioxide. Answer: Photochemical phase of photosynthesis is light dependent. If false rewrite the wrong statement in its correct form: The unit of light absorbed by the chlorophyll during photosynthesis is the proton. Plants use chlorophyll and light to make food. Which would do maximum harm to a tree? Question 7: State one important function of chloroplasts. But how do we know our plants are getting too much illumination? These herbicides can be applied preemergence or postemergence. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. A variegated leaf (one that has green as well as white patches) will only photosynthesize in the green areas. Leaves the Organs to Trap Solar Energy: Leaves contain chlorophyll which is a photoreceptor molecule. Plastoquinone 6. Question 1: All life on earth Would come to an end if there were no green plants. Radiant energy is converted into chemical energy by photosynthesis. Thus they are dependent on photosynthesis. 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. 6. Concentration of Carbon Dioxide. Plants use chlorophyll and light to make food. A high energy reduced compound formed in the light reaction and enter into the dark reaction. Pigment-inhibiting herbicides act by blocking the formation of carotenoids so that light energy from the sun destroys chlorophyll. A light induced reaction which leads to splitting of water is Photolysis of water. (True) 16. Answer: 1. Answer: ATP and NADPH2 are called assimilatory power. Answer: (i) Chlorophyll is necessary for photosynthesis. Question 14: How is the rate of photosynthesis affected when a green plant gets green light ? Leaf 2, will turn blue black at the end of starch test. People use chlorophyll as medicine. Now keep the potted plant in light. Question 4: Chloroplasts are called energy converters. (ii) Why was the plant placed in the dark before beginning the experiment ? There may also be a difference in the amounts of different pigments in the leaf. True & False | Q 4. Name the experiment to demonstrate the importance of light for photosynthesis. Answer: 1. In red-coloured light, the rate of photosynthesis is maximum whereas in green- coloured light photosynthesis does not occur. (e) Cannot tell from the information given. 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). (ii) How many veins have been shown. Answer: (i) 1. 4. PhotoLysis is the reaction which means the breaking up of water molecules. 7. Thus stomatal transpiration can take and CO2 can also enter the green leaf to enable photosynthesis to take place. Photophosphorylation 11. Moreover, too much light and ultra violet rays can destroy and damage chlorophyll in plants which are responsible for the photosynthesis reaction. (v) The leaf is then washed in water and tested with iodine. (b) Why would you select a destarched plant ? Adenosine Triphosphate 12. Question 24: A healthy croton plant bearing variegated leaves was kept in a dark cupboard to destarch it after which it was placed in sunlight for a few hours. What is the percentage of CO2 in air ? 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 ? Plastoquinone: A small molecule involved in electron and proton transfer in photosynthesis. Nicotinamide Adenine Dinucleotide Phosphate 13. (True) 8. Granum 2. 3. The main reaction which means the breaking up of water molecules through light. 2. (ii) 1. Answer: (i) In the cell organelle called plastids (or chloroplasts). These photons drive a series of reactions that produce sugar molecules, allowing plants to store energy for later use. The chemical substance used to test the presence of starch in the cell of a leaf. Answer the following: (i) What is the aim of this experiment? It can be used to classify the trophic condition of a waterbody. Researchers havent studied the effects of taking chlorophyll in pregnant or breast-feeding women. 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. 9. Pigment-inhibiting herbicides act by blocking the formation of carotenoids so that light energy from the sun destroys chlorophyll. 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) Oxygen. Too much light destroys chlorophyll. Question 2: (i) Identify the above diagram. Photosynthesis 7. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’. The dark reaction of Photosynthesis is light independent. Chloroplast 4. 12. 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. NADPH2 8. Carbon cycle. Question 5: A leaf is a food factory. ... radicals, which are toxic to the coral. Answer: (i) 3-5, (ii) Oxygen, (iii) Water, (iv) Decreases because the temperature drops, (v) Increases because photosynthesis increases. True. The researchers also found that adding some blue light prevented the stem from elongating too much. A series of chemical reactions occur is quick succession initiated by light, therefore the phase is called photochemical phase. It's what makes them look green. (iv) What change is seen on the leaf after the starch test ? (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. Answer: 1. Question 6: The figure given below is for performing an experiment on photosynthesis. Only Chlorophyll a is directly involved in the light reactions of photosynthesis. 2. (iii) To show that oxygen is given out during photosynthesis. 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. 4. 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. A plant that does not perform photosynthesis is Fungus. It can be used to classify the trophic condition of a waterbody. (iv) In what manner do the leaves 1 and 2 differ at the end of the starch test ? ATP 2. It was then set up as shown in the diagram and exposed to light for about 12 hours. Answer: (i) To prove that CO2 is necessary for photosynthesis. Answer: When a plant is kept in sunlight, CO2 released by respiration gets used by photosynthesis to synthesize food. (Also known as the thylakoid membrane.) (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. Photolysis 8. Chloroplasts capture light energy from the sun to produce the free energy stored in ATP and NADPH through a process called photosynthesis. The process by which plants produce their food. (False, Oxygen is the life supporting gas produced due to photosynthesis.) All the starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of plant. 2. Answer: Question 1: The figure below represents the vertical section of a leaf: (i) Name the parts 1 to 5. Question 7: A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. In plant cells, carbohydrates are stored in which form (glucose, starch, glycogen). This phenomenon is known as _______. Column ‘II’ is a list of items related to ideas in Column ‘I’. MeSH. Chlorophyll, Chlorophyll b, n-carotene, Photon. Thus, it’s quite logical to predict that the concentration or the solidness of carbon dioxide also affects photosynthesis. MCQ. Formation of ATP in the chioroplast in the presence of light is called photophosphorylation. Blue and red light are used more efficiently in photosynthesis. 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. (True) 3. 13. ... Photoinhibition appears to be a natural process to prevent too much light from causing damage to the zooxanthellae and coral. Thylakoids. Chlorophyll is the main molecule that plants use to capture the energy of photons, and its accumulation in a cell is dependent on light. During election transfer NADP get reduced and (rom NADP + H (NADPH2). Photosynthesis 2. False . This shows that the region which did not receive light could not synthesise starch. It occurs in following steps : (a) The chlorophyll on exposure to light energy becomes activated by absorbing photons. A dark reaction is a Thermochemical reaction. what do cells do in excess light? APlusTopper.com provides ICSE Solutions for Class 10 Biology Chapter 5 Photosynthesis for ICSE Board Examinations. Pour iodine solution on it. Its also pos… 6. (iv) Light supplies eiergy in the form of photons to split water during tight reaction. If it did absorb all wavelengths, then all plant life would be BLACK. A light reaction is a Photochemical reaction. 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. Question 9: (i) Draw a neat and well-labelled diagram of the Chloroplast. The process of photosynthesis takes place in the dark. Carbon dioxide enters the leaf through Stomata. Answer: Question 3: Chloroplast and Chlorophyll. 11. Answer: (i) The object of this experiment is to show that CO2 is necessary for photosynthesis. They can cause unintended side effects, especially if you are already taking medication or have existing health concerns. 14. Some side effects include chest pain, skin disorders and even some breathing problems. Photosynthesis 9. If false rewrite the wrong statement in its correct form: Too much light destroys chlorophyll… NADP (Nicotinamide Adenine dinucleotide phosphate): It is a coenzyme. A series of chemical reactions occur in quick succession initiated by light, therefore the phase is called photochemical phase. for plant growth and development. People use chlorophyll as medicine. Worse yet, they start to grow all long and gangly. 6. 5. Answer: (i) A large surface area to absorb water. Which process is the ultimate source of energy for all living organisms ? 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