Answer: (i) (ii) Photo chemical phase of photosynthesis is light dependent. This phenomenon is known as _______. 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. Answer: 1. Question 7: State one important function of chloroplasts. Too much light intensity may destroy chlorophyll. Mention, if the following statement is True or False. A cell that lacks chioroplast does not: (a) Evolve carbon dioxide (b) Liberate oxygen (c) Require water (d) Utilize carbohydrates, 5. (True). 7. Red 7. A high energy reduced compound formed in the light reaction and enter into the dark reaction. Mushroom 10. (iii) Why is the leaf boiled in water and alcohol before testing for the presence of starch ? The alphabet ‘A’ represents a certain condition inside the flask. the chlorophyll is destroyed at a more rapid rate than it is reconstruLcted. Answer: Green plants manufacture food during the process of photosynthesis and give out oxygen a life supporting gas for all organisms. Water may be used inside the plant but O2 released into the atmosphere. Answer: 1. These herbicides can be applied preemergence or postemergence. After a few hours, test this and any other leaf of this plant for starch. 10. 6. The primary differences between these t… type of carotenoid. (True) 18. (iv) The green parts of the leaf turned blue-black while non green parts turned brown. 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. (a) Oxygen (b) Light (c) Carbon dioxide (d) 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. Carbon dioxide is used directly in the process of photosynthesis. Question 21: On a bright sunny day water weeds growing in an aquarium were actively giving off bubbles of.gas. 10. 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. While a little cyanuric acid is a good thing, too much can destroy a pool’s ORP. However, too much sunlight can damage chlorophyll, so carotenoid pigments are present to absorb this excess energy and protect chlorophyll. Mention, if the following statement is True or False. These herbicides can be applied 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. Xanthophyll is Yellow coloured pigment. 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. (iv) What change is seen on the leaf after the starch test ? 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. 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. (v) The leaf is then washed in water and tested with iodine. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. (iii) What do you conclude from this experiment? Check with your doctor before taking it. False. Answer: (i) Photosynthesis. (b) Increases because more photosynthesis occurs. Plants use chlorophyll and light to make food. Answer: Photochemical phase of photosynthesis is light dependent. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. Land plants obtain their CO2 from atmosphere. Chlorophyll is a rich source of magnesium, vitamin A, vitamin C, vitamin E, vitamin K, amino acids, enzymes, and fatty acids. Answer the following: (i) What is the aim of this experiment? Too much energy destroys plant cells. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. ... Photoinhibition appears to be a natural process to prevent too much light from causing damage to the zooxanthellae and coral. (c) Decreases because the temperature drops. The process by which plants produce their food. Carbon dioxide is used directly in the process of photosynthesis. 11. The apparatus was kept in sunlight for almost the whole day. Plants contain other pigments that reflect different colors, but these are often masked by Chlorophyll. Too much bright light would destroy the chlorophyll. Too much bright light would destroy the chlorophyll. Question 6: Why green leaves are thin and broad ? Overview Information Chlorophyll is a green pigment found in plants. (ii) Stroma lamellae. The principal site in a green leaf for photosynthesis. 11. The various processes resulting in the circulation of carbon in different forms constitute the carbon cycle. Boil the leaf in alcohol and wash in water. (d) Decreases because carbon dioxide acts as a limiting factor. Chloroplast 4. Answer: Question 1: The figure below represents the vertical section of a leaf: (i) Name the parts 1 to 5. (ii) Name the membrane that connects thylakoid of one granum With the other granum. The chemical substance used to test the presence of starch in the cell of a leaf. The potted plant was then placed in sunlight for a few hours. (iii) Xylem – helps in the conduction of water. Then in the early hours of the morning she covered one of the leaves with black paper in the centre only. Question 5: A leaf is a food factory. c) photoinhibition Within the visible light spectrum, chlorophyll strongly absorbs red and blue light while reflecting green light 48. Answer: (i) In the cell organelle called plastids (or chloroplasts). Phosphorylation: The covalent attachment of a phosphate group to a molecule. Answer: (i) To prove that CO2 is necessary for photosynthesis. Both tasks require pigments—chlorophylls and carotenoids—which absorb light energy and either transfer it to photosystems or disperse it as heat. Thus stomatal transpiration can take and CO2 can also enter the green leaf to enable photosynthesis to take place. 4. Chest pain will happen for many reasons but it can be a side effect of consuming too much chlorophyll. 2. Answer: The tissues and cells which contain chloroplasts are mainly the palisade parenchyma and spongy mesophyll cells of a green leaf. The process of photosynthesis takes place in the dark. (i) What is the object of the experiment ? True. 6. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’. (v). Using the above information, answer the following questions : (i) State the aim of the above experiment. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. Carbon dioxide enters the leaf through Stomata. Chlorophyll can help strengthen your bones and improve bad breath, but it can have some side effects. what happens when there is too much light? Question 16: Explain why transpiration and photosynthesis are interlinked during the day. Photosynthesis can also occur n artifidal light such as that of a 100 watt electric lamp. Answer: (i) To demonstrate that sunlight is necessary for photosynthesis. 3. Write the functional activity of the following structures: 1. (i) What aspect of photosynthesis was being investigated ? 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) Oxygen. What does ATP abbreviated for ? True & False | Q 3. CO2 is the life supporting gas produced due to photosynthesis. (c) Increases because the gas becotne less soluble. 6. Question 8: Which tissues and cells are mainly concerned with photosynthesis ? Answer: The chlorophyll traps solar energy and converts it into chemical energy. for plant growth and development. The experiment showing that CO2 is necessary for photosynthesis. NADP 10. 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. 6. Nicotinamide Adenine Dinucleotide Phosphate 13. It takes place is chlorophyll containing thylakoids of chloroplast. True & False | Q 3. (i) It fakes place in the presence of light. Plants use chlorophyll and light to make food. Answer: ATP and NADPH2 are called assimilatory power. (True) 9. 84) High intensity light has a negative effect on photosynthesis; in fact, too much light can diminish photosynthetic output. (iv) Give an overall balanced chemical equation to represent the process named in (i) above. Chloroplasts capture light energy from the sun to produce the free energy stored in ATP and NADPH through a process called photosynthesis. But how do we know our plants are getting too much illumination? Blue and red light are used more efficiently in photosynthesis. After the starch test, leaf X would look like. Thus, having the right light intensity is essential to ensure your crop is successful. The unit of light absorbed by the chlorophyll during photosynthesis is the proton. Justify your answer. NADP is expanded as: (a) Nicotinamide, adenosine dinucleotide phosphate (b) Nicotinamide, adenine dinucleotide phosphate (c) Nicotinamide, adenine dinucleous phosphate (d) Nicotinamide, adenosine dinudeous phosphate, 7. Explain. Anthocyanin pigments are produced in the stems and leaves of the sun shoots. If it did absorb all wavelengths, then all plant life would be BLACK. Plastoquinone: A small molecule involved in electron and proton transfer in photosynthesis. What does NADP stand for ? You can download the Class 10 Biology ICSE Textbook Solutions with Free PDF download option. Question: 1. Question 22: What is meant by destarched plant ? VIEW SOLUTION. Mention, if the following statement is True or False. PhotoLysis is the reaction which means the breaking up of water molecules. Again, back off on the light and concentrate on developing/maintaining an efficient and robust root system. One of the leaves was covered with black paper in the centre. Other colors in leaves don’t because visible until after maturity when the chlorophyll in the foliage begins to decay and reveal other colors. 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. ATP 2. 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. what do cells do in excess light? A light reaction is a Photochemical reaction. (iii) What is the chemical substance numbered ‘2’? Chlorophyll absorbs the light required to convert carbon dioxide and water into glucose. Glucose 9. Name the structure where photophosphorylation takes place. Grana 6. 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. Thylakoids. (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. 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. Plants harvest energy from the sun with the help of chlorophyll and carotenoid, two photon-capturing molecules. They are called so, because they provide the energy requirement for CO2 assimilation during dark reaction of photosynthesis. Too much light destroys chlorophyll. (ii) No CO2 in the flask. 4. 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. Maybe black plants will evolve in the future. There may also be a difference in the amounts of different pigments in the leaf. 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. 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