powerpoint presentation of photosynthesis
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Transcript of powerpoint presentation of photosynthesis
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Photosynthesis by Mpho Modise
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photosynthesis
• Is the process by which plants utilise to produce their own food
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Why is Photosynthesis important?Where by plants produce their own foodAll of life is supported by photosynthesis because it begins all food webs and chainsIt also makes oxygen.
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Photosynthesis-starts to ecological food webs!
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Plants use sunlight to turn water and carbon dioxide into glucose. Glucose is a kind of sugar. Only plants can produce or make their own food because they consist of chlorophyllAutotrophs make glucose and heterotrophs are consumers of it.
Photo-synthesismeans "putting together with light."
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How do we know that plants make carbohydrates from just carbon dioxide water and light energy?
• For example:Jan Baptisa van Helmont (1648) planted a willow
branch weighing 5 pounds into 200 pounds of soil and then after 4 years the tree weighed
169 lbs. and the soil was still nearly 200 lbs.
Experiments!
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Photosynthesis
Carbon dioxide + water glucose + oxygensunlight
absorbed by chlorophyll
6CO2 + 6H2O + energy C6H12O6 + 6O2
As can be seen from the equation for photosynthesis, the wood, bark, and root came from water and carbon dioxide.
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Check it!
Plants in Action
What is the process that uses the sun’s energy to make simple sugars?
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Plant leaves have many types of cells!
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Plant Cells
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The photograph below is an elodea leaf X 400. Individual cells are clearly
visible. The tiny green structures within the cells are chloroplasts
this is where photosynthesis
happens.
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Chloroplasts make the sugars!
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Photosynthesis• An anabolic, endergonic, carbon
dioxide (CO2) requiring process that uses light energy (photons) and water (H2O) to produce organic macromolecules (glucose).
6CO2 + 6H2O C6H12O6 + 6O2glucose
SUNphotons
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Plants
• Autotrophs: self-producers.• Location:
1. Leavesa. stomab. mesophyll cells
StomaMesophyllCell
Chloroplast
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Stomata (stoma)
• Pores in a plant’s cuticle through which water and gases are exchanged between the plant and the atmosphere.
Guard Cell
Guard Cell
Carbon Dioxide (CO2)
Oxygen (O2)
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Mesophyll Cell
Cell WallNucleus
Chloroplast
Central Vacuole
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Thylakoid Thylakoid Membrane
Thylakoid SpaceGranum
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Absorption of Chlorophyll
wavelength
Absorption
violet blue green yellow orange red
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References
• http://colleen_snow.azschool.org/teacher/files/documents/photosynthesis[1].ppt
• http://www.csun.edu/science/scale/4th_grade/ppt/photosynthesis.ppt
• Cambpbell & Reece (2010) biology, eighth edition