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Photosynthesis. April 23, 2014. What exactly is photosynthesis?. 2 parts: Photo = light Synthesis = to put together Using light to put together sugars (glucose) needed by organisms to produce energy What elements are involved? Oxygen, carbon, and hydrogen.

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photosynthesis

Photosynthesis

April 23, 2014

what exactly is photosynthesis
What exactly is photosynthesis?
  • 2 parts:
    • Photo = light
    • Synthesis = to put together
    • Using light to put together sugars (glucose) needed by organisms to produce energy
    • What elements are involved?
      • Oxygen, carbon, and hydrogen
where does photosynthesis take place in plants
Where does photosynthesis take place in plants?
  • Inside the leaves are smaller parts called cells
  • Inside these cells is a structure called the chloroplast
  • Inside the chloroplast are pancake like structures called grana
  • Inside the grana is the pigment chlorophyll that absorbs light energy and reflects the color green so they appear green
how exactly do plants make sugars
How exactly do plants make sugars?
  • Take in CO2 and H2O and light to make
    • C6H12O6 and O2

However photosynthesis is a little more complicated

occurs in 2 different stages (shifts)

what are the 2 stages
What are the 2 stages?
  • 1. light reactions – light is used to split water into hydrogen and oxygen
    • Hydrogen is used for the second stage and oxygen is given off as a by-product

2. Calvin cycle (dark reactions) – Hydrogen from light reactions is put together with CO2 to produce sugars

light reactions occur during the day

Calvin cycle occurs at night

so how does carbon dioxide and oxygen get in and out of plants
So how does carbon dioxide and oxygen get in and out of plants?
  • These gases enter and leave through specialized cells called stomata which are sandwiched in between 2 guard cells that can open or close depending on what is needed
  • Water leaves the leaves of plant through a process called transpiration
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