Photosynthesis

How the process of getting energy from the sun is organized and WHY

it is essential!

Where are we?

Functional of the plant:

Of the leaf:

Of the mesophyll cell:

Of the chloroplast:

Overview

Energy from light

• Wavelength• Absorption• Reflection

Light Dependent Reactions

• What is happening here?• What part of the chloroplast are we in?

Electron Transport Chain

• Photosystem II:– Split water

– Give off O2 gas

– Chlorophyll’s Electrons released to the ETC to make ATP

– Water replenishes electrons

• Photosystem I:– Form NADPH

– Electrons from P II replace chlorophyll’s electrons

Why does an electron transport chain produce ATP?

So where are we?

Light Independent Reactions (Calvin Cycle)

• Where does this happen?

• What is happening here?

Calvin Cycle

• CO2 is reduced by the H’s from NADPH

• ATP from light reactions is necessary for this to work.

• Enzyme “rubisco” helps add H’s• Forms a 3 carbon sugar “G3P”• Calvin cycle must happen 2X to make a

glucose

Why these two parts are dependent upon eachother

Photosynthesis and Respiration• Make a Venn

Diagram comparing photosynthesis and aerobic cellular respiration. Remember to include similarities and not just differences!

Adaptations!

• Photorespiration: when it is really hot and dry and plants close their stomata to keep in water, they accidentially use O2 instead of CO2 in the calvin cycle. Why is this bad?

Who lives in hot, dry areas?

• Pineapples– C4 plants

• Cactus – CAM plants

Adaptations

• Temporal• Structural• Why are organic acids necessary?