Bài slide tổng hợp 3 yếu tố chính ảnh hưởng đến quá trình quang hợp của cây. Đây là bài của nhóm mình làm để thuyết trình (lớp mình học hoàn toàn bằng Tiếng Anh) nên phải làm bằng Tiếng ANh, ko có bản tiếng Việt. Nếu có vấn đè khúc mắc, có thể gửi tin nhắn cho mình.
Group Limiting Factors affect the Rate of Plant’s Photosynthesis Outline of the Presentation I II III • Introduce Photosynthesis process of plants • Light Intensity • Temperature • Concentration of Carbon Dioxide • Conclusion I Introduction Photosynthesis process of plants Light Advancing Chemical Sciences Limiting Factors *The law of limiting factors states that: At any point in time, one of other factors will be in low supply and limit the rate of photosynthesis Thus, the factor in lowest supply is called the limiting factor *Limiting factors that affects the rate of photosynthesis: Light Intensity Temperature CO2 Concentration *Rate of photosynthesis: describe how much sugar and oxygen a plant can produce over time II Limiting factors affecting the rate of plant’s photosynthesis Light Intensity http://science.halleyhosting.com/ *Stoma (khí khổng): is a pore, found in the epidermis (biểu bì) of leaves that is used to control gas exchange Chlorophyll www.bbc.co.uk *Chlorophyll( chất diệp lục): a green pigment (sắc tố) found in chloroplasts (lạp lục), present in all green plants iweb.langara.bc.ca *Chloroplast ( lạp lục): tiny factories inside the cells of plants It takes the energy from the sunlight and use it to make plant food [rate of photosynthesis] O From O to A, as light intensity increases, the photosynthetic rate also increase Light intensity is a limiting A factor during this stage B From A to B (saturated point), eventhough light intensity increases, rate of photosynthesis remains constant Light intensity is no longer a limiting factor 250C *The temperature is higher than 250C => the rate of photosynthesis falls rapidly *The enzymes are denatured *Denatured (biến dạng): change the shape Why are the enzymes denatured in high temperature (over 25 C) ? *Enzymes and denatured process *Substrate (chất nền): In this case, the two substrates for photosynthesis are carbon dioxide (CO2) and water (H2O) *Denaturing enzymes The enzyme is denatured at 450C The rate of photosynthesis stops entirely Concentration of CO2 0.03-0.04% 0.03-0.04% http://www.eschooltoday.com/photosynthesis/carbon-dioxide-for-photosynthesis.html *CO2 diffusion process 0.03-0.04% *Diffusion (khuếch tán): the tendency of molecules to spread out in available space http://www.rsc.org/learn-chemistry/content/filerepository/CMP/00/001/068/Rate%20of%20photosynthesis %20limiting%20factors.pdf http://www.passmyexams.co.uk/GCSE/biology/carbondioxide-affecting-rate-of-photosynthesis.html 0.03-0.04% CO2 PR Certain C02 concentration => Photosynthesis stays constant PR: photosynthesis rate 0.03-0.04% III Conclusion - Photosynthesis is the one of the most important processes which supplies oxygen and gives off carbon dioxide to our life - Photosynthesis process is directly dependent on the supply of temperature, light intensity, and concentration of carbon dioxide Limiting any one of these factors can limit the rate of photosynthesis - With knowledge of limiting factors, it is possible to control the growing conditions for crop plants This enables faster growing of plants and the increase of their quality and yield REFERENCES • http:// www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pr e_2011/plants • http://revisionworld.com/a2-level-level-revision/biology /energy-life/biochemistry-photosynthesis/photosynthesisfactors-and-uses • http:// www.nuffieldfoundation.org/practical-biology/investigati ng-factors-affecting-rate-photosynthesis • http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2213731 • http:// science.opposingviews.com/effect-temperature-rate-phot osynthesis-19595 • https:// www.stem.org.uk/elibrary/resource/34936/rate-photosynth esis-limiting-factors • http:// Thank you for your attention ! ... of plants Light Advancing Chemical Sciences Limiting Factors *The law of limiting factors states that: At any point in time, one of other factors will be in low supply and limit the rate of photosynthesis. .. photosynthesis Thus, the factor in lowest supply is called the limiting factor *Limiting factors that affects the rate of photosynthesis: Light Intensity Temperature CO2 Concentration *Rate of photosynthesis: ... concentration of carbon dioxide Limiting any one of these factors can limit the rate of photosynthesis - With knowledge of limiting factors, it is possible to control the growing conditions for crop plants