Photosynthesis In-Depth

• The process of converting light energy into sugars (glucose) that store chemical energy​

• Happens in the leaves of plants inside of chloroplasts​

• 3-part process​

​Photosynthesis

• ​Grana

• Stroma​

​Chloroplasts

​Two Main Parts

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• Stacks of thylakoids are called Grana

• Thylakoids contain the chlorophyll​

• Location of the light-dependent reactions​

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​Grana

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• Fluid that surrounds the grana inside a chloroplast

• ​Location of the light-independent reactions

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​Stroma

• Photosystem II

• Photosystem I

• ​Calvin Cycle

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​3 part process

• Photosystem II

• Photosystem I​​

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​Light-Dependent Reactions

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• Energy absorbed from sunlight by the chloroplasts

• H₂O molecules broken via enzymes

• H⁺ ions pumped into the thylakoid

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​Photosystem II

• Energy absorbed f​rom sunlight

• NADPH produced

• Hydrogen Ion Diffuse out of Thylakoid

• ATP produced​ via hydrogen ions flowing through ATP synthase​

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​Photosystem I

• The Calvin Cycle

• Occur in the stroma​

• Use ATP and NADPH from the light-dependent reactions

• Makes Glucose​

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​Light-independent Reactions

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• CO²​ added to a 5-C molecule creating a 6-C molecule

• ​Two 3-C molecules formed by splitting the 6-C molecule

• ​1 3-C molecule exits then is bonded to another creating Glucose

• The other 3-C molecule is recycled back into a 5-C molecule then used in step 1​

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​Calvin Cycle