powerpoint presentation of photosynthesis
TRANSCRIPT
Photosynthesis by Mpho Modise
photosynthesis
• Is the process by which plants utilise to produce their own food
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.
Photosynthesis-starts to ecological food webs!
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."
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!
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.
Check it!
Plants in Action
What is the process that uses the sun’s energy to make simple sugars?
Plant leaves have many types of cells!
Plant Cells
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.
Chloroplasts make the sugars!
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
Plants
• Autotrophs: self-producers.• Location:
1. Leavesa. stomab. mesophyll cells
StomaMesophyllCell
Chloroplast
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)
Mesophyll Cell
Cell WallNucleus
Chloroplast
Central Vacuole
Thylakoid Thylakoid Membrane
Thylakoid SpaceGranum
Absorption of Chlorophyll
wavelength
Absorption
violet blue green yellow orange red
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