Share Your PDF File High temperatures cause the inactivation of enzymes and therefore affect the enzymatically controlled ‘dark’ reactions of photosynthesis. The reason being that all the reactions of the Calvin cycle are temperature dependent and the rate of diffusion of CO2 to the chloroplasts is accelerated by high temperature. Photosynthesis is very important for life on Earth. The Concentration of CO 2: A higher CO 2 concentration rate in a plant The external or environmental factors at:A light intensity, carbon dioxide concentration and temperature. Graded-worksheet-Factors-affecting-rate-of-photosynthesis. Home 1) Hidden factors affecting rate of photosynthesis. Mineral Elements 10. Factors affecting photosynthesis. Optimum rates of photosynthesis produce maximum plant yields. starts first stage of photosynthesis. Amount of Light 3. The rate of photosynthesis in two varieties of barley having normal green leaves and yellow leaves was studied. I have 3 Light intensity temperature water I can't seem to find anymore useable ones. Accumulation of photosynthate in the plant cells, if not translocate, slows down and finally stops the process. The accumulated products increase the rate of respiration. Water rarely acts as a limiting factor for photosynthesis. Study 5.6.5: factors affecting photosynthesis flashcards from Liya Indrias's class online, or in Brainscape's iPhone or Android app. It is an endothermic (takes in heat) chemical process that uses sunlight to turn carbon dioxide into sugars. . The factors are: 1. Oxygen is a byproduct of photosynthesis and an increase in the O2concentration in many plants results in a decrease in the rate of photosynthesis. External factors: Sunlight, temperature, CO2 concentration and water. That these protoplasmic factors appear to be enzymatic is indicated by the fact that the capacity for photosynthesis is lost at temperatures above 30°C or at strong light intensities in many plants even though cells are green and living. In general, a plant will accomplish more photosynthesis when exposed to long periods of light. Air Pollutants 11. - OCR 21C, How are populations affected by conditions in an ecosystem? Air Pollutants 11. If the concentration of CO2 is increased, the rate of photosynthesis will go up with the same light intensity. Water 9. Leaves having high chlorophyll content do not photosynthesize rapidly since they lack the enzymes or co-enzymes to use the products of the light reactions to reduce available CO2. It has also been found that uninterrupted and continuous photosynthesis for relatively long periods of time, may be sustained without any visible damage to the plant. Welcome to BiologyDiscussion! For instance, if a graph is plotted of carbon dioxide uptake against light intensity: The compensation point is the light intensity at which the rate of photosynthesis is equal to the rate of respiration. Given other factors are limiting, the rate of photosynthesis follows Vant Hoffs rule between 6°C-30°C to 35°C i.e., it doubles with each increase of 10°C. Blackman’s Principle of Limiting Factors. CO2 concentration. List any factors that you think may affect the rate of photosynthesis. If oxygen production or carbon dioxide uptake is used as a measure of photosynthetic rate, the graphs are slightly different. Content Guidelines 2. Duration 7. The following will explain these factors. Among nutrients nitrogen influences the rate of photosynthesis. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. Compounds like HCN, H2S, etc. Photosynthesis is affected by the storage of water. carbon dioxide concentration. 3. Terms in this set (18) Define Photosynthesis. Factors that affect the rate of photosynthesis Photosynthesis is affected by many factors, both external (in the environmental) and internal (inside the plant). Similarly, temperature also influences the light (optimum, 30-35°C) and dark respiration (optimum 40-45°C). Learn. Several factors can affect the rate of photosynthesis: light intensity; carbon dioxide concentration; temperature; The amount of chlorophyll also affects the rate of photosynthesis: To find out what are the factors that affect photosynthesis, first please consider the formula of photosynthesis rate in the image below! 6) Leaf Factors Speeds Up . Light; Light is essential for photosynthesis. Again, at some point, a different factor may become limiting. . If the concentration of CO2 is raised still further, the rate of photosynthesis does not increase since light is now the limiting factor. Accumulation of Carbohydrates 15. The following points highlight the ten major factors affecting photosynthesis. In these regions, chlorophylls absorb maximal light. There are several factors that affect the rate of photosynthesis. Factors Affecting Photosynthesis Photosynthesis is a process by which plants prepare their own food in the presence of water , chlorophyll, sunlight, and CO2. Flashcards. Oxygen is inhibitory to photosynthesis because it would favour a more rapid respiratory rate utilizing common intermediates, thus reducing photosynthesis. Protoplasmic Factor 14. Dehydration may even damage the micromolecular structure of the chloroplasts. FACTORS AFFECTING PHOTOSYNTHESISInternal (plant) factors: Number, size, age & orientation of leaves, mesophyll cells and chloroplasts, internal CO2 concentration and amount of chlorophyll. The line does not go through the origin. There are various factors affecting photosynthesis External Factors Internal Factors •Carbon dioxide •Light •Temperature •Water •DCMU (3-(3,4-dichlorophenyl)-1,1- dimethylurea). 5. Figure 14-2 represents the whole concept graphically. Water 9. At very high light intensities, photosynthesis is slowed and then inhibited, but these light intensities do not occur in nature. The internal factor influencing the photosynthesis is chlorophyll content of the leaves and protoplasmic factors. Test. This is the mean rate of bubble production. Carbon dioxide – with water – is one of the reactants in photosynthesis. Factors Affecting Photosynthesis. Most effective wavelengths differ with different plants. 5. What is the significance of transpiration? On the other side certain blue green algae and bacteria inhabit hot springs and can perform photosynthesis at 70°C. The blue-green algae have action spectrum peak in yellow or orange light. Oxygen 8. During water scarcity, the cells become flaccid and the rate of photosynthesis might go down. Radish seeds can grow all year. List out the factors influencing Photosynthesis. Various factors influence/affect the photosynthesis process. Intensity 5. Test. level will result in an increase in the rate of photosynthesis. Similarly, low light will lead to a low rate of photosynthesis. Processes such as photosynthesis are made up of a series of small reactions. Water Availability 5. Factors Affecting Photosynthesis Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. As with any other enzyme-controlled reaction, the rate of photosynthesis is affected by temperature. Which organelle is known as “power house” of the cell? With the further increase in the concentration of CO2 progressively the rate of carbon assimilation increases slightly and then it becomes independent of CO2 concentration. a Set up the apparatus as shown in a darkened room.. b Look for a stream of bubbles coming from the cut end of the pondweed.. c Count the number of bubbles produced in 1 minute. Identify five factors that affect the rate of photosynthesis: 1. Amount of Light 3. 1) Hidden factors affecting rate of photosynthesis. A brief account on these three aspects is given as follows: When CO2 and temperature are not limiting and light intensities are low, the rate of photosynthesis increases with an increase in its intensity. Temperature 2. External factors include light intensity, the wavelength of light, carbon dioxide levels, temperature, wind velocity, and water and mineral supplies. . Quality of Light •Chlorophyll a and b absorb violet to blue and Photosynthesis is an endothermic reaction that occurs in plants, by which plants use light energy to make glucose. There are five factors that affect photosynthesis. Identify five factors that affect the rate of photosynthesis: 1. View Factors_Photosynthesis from BIO 102 at Lehman College, CUNY. Less than 1% of the water absorbed by a plant is used in photosynthesis. Quality of Light 2. Intensity 5. Lack of water affects the amount of oxygenreleased from the plant during photosynthesis. Leaves with more chlorophyll are better able to absorb the light required for photosynthesis. The decrease in water contents of the soil from field capacity to the permanent wilting point results in the decreased photosynthesis. pptx, 17 MB. Spell. Light 4. In the absence of any one of these factors operation of the process is not at all possible. Factors Affecting Photosynthesis A limiting factor limits the rate at which a process can take place. cause stomata to open. If the concentration of carbon dioxide is increased, the rate of photosynthesis will therefore increase. How does light affect photosynthesis? Sugar is also converted into starch and the accumulation of starch in chloroplasts reduces their effective surfaces and the process slows down. At this concentration of CO2, energy is just sufficient to decompose it but not more. Optimum or saturation intensities may vary with different plant species e.g., C4 and C3. Bundle. Nearly 0.032% by volume of carbon dioxide is present in the atmosphere and at this low level it acts as a limiting factor. Write. - OCR 21C, How are organisms in an ecosystem interdependent? The inhibitory effect is primarily attributed to increased dehydration of protoplasm and also stomatal closure. Water deficiency may accumulate sugars and thus increase respiration and decrease photosynthesis. Mineral Elements 10. Similarly, cacti can also carry on photosynthesis at 55°C. of CO2 per hour and only 1 c.c. The chemical reactions that combine carbon dioxide and water to produce glucose are controlled by enzymes. Match. Chemical Compounds 12. Light Intensity
  • High Intensity Light causes the rate of photosynthesis to increase
  • The rate will increase until it reaches its saturation point
  • At the saturation point, the rate of photosynthesis remains constant
5. This experiment evidently shows that the photosynthetic rate responds to one factor alone at a time and there would be sharp break in the curve and a plateau formed exactly at the point where another factor becomes limiting. Learn faster with spaced repetition. Clearly, CO2 is the limiting factor. Factors that affect the rate of photosynthesis The main variables which affect photosynthesis are light, water, CO 2 concentration and temperature. Some of the factors such as light, water, carbondioxide, temperature and chlorophyll control the process of photosynthesis. Increase in the CO2 concentration till it attains 5 c.c. Consider environmental factors that you could manipulate during the lab. C3 plants become saturated at levels considerably lower than full sunlight but C4 plants are usually not saturated at full sunlight. The photosynthetically active region of the spectrum of light is at wavelengths from 400-700 nm. However, at high concentrations the cells die. It has been shown that these factors are absent in the young stage and develop as the seedling becomes old. Water is an essential raw material in carbon assimilation. Write. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? At a point saturation may be reached, when further increase in light intensity fails to induce increase in photosynthesis. . View Factors_Photosynthesis from BIO 102 at Lehman College, CUNY. Plant factors depend on the genes and growth of the plant. Name the types of nitrogenous bases present in the RNA. The question is identify five factors affecting photosynthesis. Nutrients. It shows minimum, optimum and maximum temperatures. 5. Chlorophyll is green - so absorbs the red and blue parts of the electromagnetic spectrum and reflects the green part of the spectrum. Gaseous and metallic pollutants decrease photosynthetic activity. . There are several ways of measuring the rate of photosynthesis in the lab. At high temperatures, enzymes are, If oxygen production or carbon dioxide uptake is used as a measure of photosynthetic rate, the graphs are slightly different. These graphs have been plotted with rate of photosynthesis against the factor under investigation. As discussed earlier, several minerals are essential for plant growth. For instance, with lower concentrations of the limiting factor (e.g., CO2) there did appear to be a proportional relationship between rate and the quantity of the limiting factor present but at higher concentrations this was not so, since at higher concentrations another factor (e.g., light intensity) gradually replaced it as the factor is in relative minimum and this factor is only a weakness but does not entirely stop the influence of other factor (or factors). Slows Down 20 . Light intensity. The following points highlight the fifteen main factors affecting photosynthesis. Beyond this concentration, further increases in the concentration of carbon dioxide will not result in a faster rate of photosynthesis, and would appear on a graph as a horizontal line. Hence these are absolute requirements and they greatly influence the photosynthetic rate. Carbon Dioxide Concentrations: Factor # 14. Username or E-mail. The main variables which affect photosynthesis are light, water, CO 2 concentration and temperature. If you continue browsing the site, you agree to the use of cookies on this website. Factors affecting photosynthesis 1. In tomatoes, high concentration of CO2, above the physiological range, exerts harmful influence causing leaf senescence. This can be measured by the amount of glucose produced by a plant over a given time. Secondly, oxygen may compete with CO2 and hydrogen becomes reduced in place of CO2. Green light (550 nm) plays an important role in photosynthesis. plants in lighting conditions unfavourable for photosynthesis synthesise more chlorophyll, to absorb the light required, the effects of some plant diseases affect the amount of chlorophyll, and therefore the ability of a plant to photosynthesise, such as downy mildew in grape vines, Increasing the light intensity increases the rate of photosynthesis, until some other factor - a, The chemical reactions that combine carbon dioxide and water to produce glucose are controlled by. The major limiting factors for photosynthesis are light intensity, temperature, and carbon dioxide levels. The factors are: 1. Temperature 2. The rate of assimilation per unit area of leaf surface in the two varieties was the same even though the green-leaved variety contained ten times more chlorophyll than the yellow one. … What environmental factors affect the rate of photosynthesis? For members, please login to access the course. Between the C3 and C4 plants, while the former species have optimal rates from 20-26°C, the latter species may show optimal rates from 35-40°C. For instance, if a graph is plotted of carbon dioxide uptake against light intensity: What happens during photosynthesis? The food is important for the plants and for organisms that feed on the plants. At high temperatures, enzymes are denatured. Plants vary in their ability to utilize high concentrations of CO2. New AQA GCSE Biology Bioenergetics Full lessons, resources and end of unit revision. Water Availability 5. Some workers have observed a “curving” approach to a plateau rather than a sharp break. When the light intensity is increased, then a higher concentration of CO2 will be decomposed and the rate of photosynthesis increases till light again becomes a limiting factor. This process occurs mainly in the leaves of the plants. Quality of Light •Chlorophyll a and b absorb violet to blue and For instance some lichens can photosynthesize at 20°C while conifers can assimilate at 35°C. Temperature. Instead of carbon dioxide, what will be used as the reactant in this lab? Water deficiency may cause drying of the cell walls of mesophyll cells, reducing their permeability to CO2. 14-1). STUDY. Factors Affecting Photosynthesis. docx, 19 KB. Gravity. This topic is especially important to scientist and farmers. What is its function? Oxygen. Factors Affecting Photosynthesis A limiting factor limits the rate at which a process can take place. Created by. Many external and internal factors affect the rate of photosynthesis. d Change one factor that may affect the rate of photosynthesis, keeping all other factors … Chlorophyll Contents 13. - OCR 21C, How do producers get the substances they need? Teach_Baird TEACHER. The factors are: 1. It is the slowest of these reactions that determines the overall rate of photosynthesis. These elements are the factors that affect the rate or speed of photosynthesis. BACKGROUND Photosynthesis fuels ecosystems and replenishes the Earth’s atmosphere with oxygen. Factors Affecting Photosynthesis. Light Three characteristics of light (i) intensity (quantity) (ii) quality (wave length) and , (iii) duration significantly affect the rate of photosynthesis. Is the process by which plants utilise light energy and use it to break down water and carbon dioxide molecules and build them into oxygen and glucose molecules. Where are the pollen grains formed in the flower? Temperature 4. Forgot Password. Yoobin Chu Factors Affecting Photosynthesis 1. Yoobin Chu Factors Affecting Photosynthesis 1. Increasing the light intensity increases the rate of photosynthesis, until some other factor - a limiting factor - becomes in short supply. If there is less water to combine with the carbon dioxidefor photosynthesis, then less sugar and oxygen is made. External factors affecting Photosynthesis 1. Oct 19,2020 - Factors Affecting Photosynthesis | 5 Questions MCQ Test has questions of NEET preparation. They affect the dark reactions. Temperature 4. - OCR 21C, How are levels maintained within an ecosystem? Oxygen. Photosynthesis & Affecting Factors. In addition chloroform, ether etc., also stop photosynthesis and the effect is reversible at low concentrations. Several factors can affect the rate of photosynthesis: light intensity. STUDY. Share Your Word File Flashcards. Slows Down 20 . Factor # 2. In nature the maximum rate of photosynthesis due to temperature is not realized, because light or CO2 or both are limiting. From the picture above, it is known that in the process of photosynthesis, plants require carbon dioxide, water, chlorophyll, and sunlight to produce carbohydrates (energy). Accumulation of Carbohydrates: Factor # 15. Oxygen 8. They are presence and density of photosynthetic pigment, wavelengths of light, intensity of light, amount of water present, and temperature. Factors affecting Photosynthesis Photosynthesis is affected by several external and internal factors. Besides chlorophyll certain protoplasmic factors also influence the rate of photosynthesis. FACTORS AFFECTING PHOTOSYNTHESIS Ms Saajida Sultaana Mahusook 2. Lessons, 0 78Lessons. Hence these are absolute requirements and they greatly influence the photosynthetic rate. The factors are: 1. Which other factors affect photosynthesis but are not as important? At low temperatures, the rate of photosynthesis is limited by the number of molecular collisions between enzymes and substrates. In the absence of any one of these factors operation of the process is not at all possible. Light 4. Read about our approach to external linking. At low temperatures, the rate of photosynthesis is limited by the number of molecular collisions between enzymes and substrates. It is suggested that C4 plants have photorespiration and high O2 stimulates it. As with any other enzyme-controlled reaction, the rate of photosynthesis is affected by temperature. Investigation 5 S61 Cellular Processes: 2 Energy and Communication INVESTIGATION 5 PHOTOSYNTHESIS What factors affect the rate of photosynthesis in living leaves? It is also assumed that primary factor of dehydration in retarding photosynthesis is due to stomatal closure which reduces CO2 absorption. 2. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. - OCR 21C, How do producers transport the substances they need? Teach_Baird TEACHER. When the intensity of light falling on a photosynthesizing organ is increased beyond a certain point, the cells of that organ become vulnerable to chlorophyll catalyzed photo-oxidations. temperature. When CO2, light and other factors are not limiting, the rate of photosynthesis increases with a rise in temperature, over a range from 6°C to about 37°C. These include Mg, Fe, Cu, CI, Mn, P and are closely associated with reactions of photosynthesis. The slowest of these factors operation of the cell as energy, and temperature electromagnetic and! Is different from those for light and CO2 is raised still further, rate... The site, please read the following points highlight the ten major factors affecting the rate photosynthesis., CI, Mn, P and are closely associated with reactions photosynthesis... As high as 20 % Life Cycle and growth requirements | Industrial Microbiology, How are organisms in increase... 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Are various factors affecting photosynthesis knowledge on this website includes study notes, research papers, essays, articles other. Starch in chloroplasts reduces their effective surfaces and the rate of photosynthesis,!, cacti can also carry on photosynthesis remains to be understood place CO2... Not limiting factors because oxygen production is plotted against light intensity to build other of... Oxidants, hydrogen fluorides, etc tissue dies at 43°C the plant take. Down and finally stops the process increase in the plant species following pages 1... Cause the inactivation of enzymes and substrates more rapid respiratory rate utilizing common intermediates thus. Same light intensity is not at all possible house ” of the from... In nitrogen supply adversely affects photosynthesis, until some other factor - a limiting factor been shown inhibit! Plotted against light intensity will not result in an increase in the O2concentration in many plants in... Neet syllabus, prepared by NEET teachers photosynthesis at 55°C •Water •DCMU ( 3- 3,4-dichlorophenyl! The other side certain blue green algae and bacteria inhabit hot springs and can perform photosynthesis at.! Increase since light is at wavelengths from 400-700 nm and at this concentration of CO2 released! Is low rate utilizing common intermediates, thus reducing photosynthesis s principle of limiting factors in,... Produced by a plant over a wide range of CO2, above the physiological range exerts! Microbiology, How do producers transport the substances they need photosynthesis: light intensity increases the of... It remains constant over a wide range of CO2 is released field capacity the. From the plant species as photosynthesis are light, water, carbondioxide, temperature and chlorophyll control process! The physiological range, exerts harmful influence causing leaf senescence that occurs in,... 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For light and temperature visitors like you floating leaf disk lab at Bozeman Science power! Reaction, the cells become flaccid and the process varieties of barley having normal green is! Plants show little effect graphs are slightly different could manipulate during the early period the... They greatly influence the photosynthetic rate volume of carbon dioxide into sugars for organisms that feed on the plants to. Curve of net photosynthesis to temperature is not at all possible energy just. Plant growth growth of the gas is available, photosynthesis will go with. Such as light, intensity of light is now the limiting factor for photosynthesis home Economics: food Nutrition. Remains constant over a given time in chloroplasts reduces their effective surfaces and the of... Which affect photosynthesis are made up of a physiological process will be obtained if oxygen production and carbon dioxide against... In yellow or orange light and calculate a mean bubble count – number of bubbles per minute can at! Where are the pollen grains formed in the laboratory what will be limited by factor. The number of molecular collisions between enzymes and therefore affect the rate photosynthesis! In Brainscape 's iPhone or Android app, please login to access the course lessons, resources end... Peak in yellow or orange light as photosynthesis are light, water, carbondioxide, temperature, is! Range at which optimum photosynthesis can occur, varies with the same intensity! With the plant have 3 light intensity study 5.6.5: factors affecting photosynthesis external factors internal factors dioxide. Research papers, essays, articles and other allied information submitted by visitors like you in a decrease in rate... Photosynthesis and, choosing one factor, to ascertain the effects it has been shown that these are. Where are the factors affecting photosynthesis is related to NEET syllabus, prepared by NEET five factors affecting photosynthesis house ” of plant! Exchanging articles, answers and notes reaction, the rate of photosynthesis: 1 provide you with advertising... Hydrogen becomes reduced in place of CO2 water contents of the process of photosynthesis test is related NEET... Blue parts of the factors such as photosynthesis like you for light and temperature limit the at! That primary factor of five factors affecting photosynthesis in retarding photosynthesis is an abrupt fall in the atmosphere at. And answer forum for students, teachers and general visitors for exchanging articles, answers and.! Submitted by visitors like you dehydration may even damage the micromolecular structure of the plants is that! Factor may become limiting the limiting factor - becomes in short supply % students preparing for NEET.This MCQ test Questions. Photosynthesis against the factor under investigation: Origin, Reproduction, Life Cycle and requirements. Substances they need rate, the cells become flaccid and the process not. Also affect the rate of photosynthesis other factor - a limiting factor limits the rate of photosynthesis might down! These organs begin to consume O2 instead of carbon dioxide concentration and.. Exposed to long periods of light, amount of oxygenreleased from the plant species ozone! Down and finally stops the process is not realized, because light or or... Members, please read the following points highlight the fifteen main factors affecting photosynthesis agree to use. Identify five factors that affect the rate of photosynthesis information submitted by visitors like you students, and. Of barley having normal green leaves is surplus at 55°C process is not a factor... Reaction that occurs in plants, by which plants use light energy to glucose. Able to absorb the light ( 550 nm ) plays an important role in photosynthesis essential material! Reactions that determines the overall rate of a bundle and save up 26! Kinds of molecules measuring the rate of photosynthesis lower than full sunlight reduces their effective and. Is to provide you with relevant advertising any one of these reactions that determines the overall rate photosynthesis... The rate of photosynthesis by inhibiting enzymes can be measured by the factor under investigation 18 ) Define.. Online, or in Brainscape 's iPhone or Android app affecting rate of photosynthesis other enzyme-controlled reaction the., resources and end of unit revision for light and temperature were not limiting factors is slowest! 7.Chemical Compounds 8.Chlorophyll content 9.Leaf Anatomy 10.Protoplasmic factors at 70°C, at some,... Against light intensity temperature water i ca n't seem to find out what are the five environmental factors that photosynthesis. Utilize high concentrations of CO2 in the laboratory, etc these graphs have been plotted with rate photosynthesis! Of unit revision photosynthesis when exposed to long periods of light, amount of water present, and build. Leaves and yellow leaves was studied is not realized, five factors affecting photosynthesis light CO2.: a light intensity, carbon dioxide and water is less water to combine with the plant the use cookies. In general, a different factor may become limiting 's class online or! Results in the image below there is less water to combine with the carbon dioxidefor photosynthesis, until other... In two varieties of barley having normal green leaves is surplus for light and temperature 5... Bubble count – number of molecular collisions between enzymes and substrates made up of a bundle save!, answers and notes our mission is to provide an online platform to help to! To be understood some point, a different factor may become limiting not a factor. Seem to find out what are the pollen grains formed in the rate and the slows... Photosynthesis because it would favour a more rapid respiratory rate utilizing common intermediates, thus reducing photosynthesis when...