Photosynthesis

1. Mesophyll

1. Mesophyll

A layer of cells that contain & are responsible for most of the plant’s photosynthesis

chloroplasts

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2. StomataOpenings in plant leaves that allow for to occur

(CO2) passes in and (O2) passes out.

CO2

O2

gas exchange

Carbon Dioxide Oxygen

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Mesophyll Cell

3. ChloroplastThe site of ___________ Photosynthesis

Double-membrane bound organelle

5. Inner membrane

4. Outer membrane

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6. Stroma:7. Thylakoid

8. Grana:

8. Grana

resides in these membranes

Chlorophyll

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Fluid filled space within the chloroplast

A stack of _________thylakoids

Why are leaves green?Substances that absorb light are called

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Chlorophyll a

Chlorophyll b

Carotenoids

Chlorophyll absorbs and light, reflecting

pigments

red blue green

PhotosynthesisOccurs in 2 Steps:1) Light Reactions in the thylakoid2) Calvin Cycle in the stroma.

• Calvin Cycle is also referred to as the Dark Reactions or Light Independent Reactions

Calvin Cycle (Light Independent or Dark Reactions)

Photosynthesis: The Light Reaction

• are chemical factories powered by the sun.

• The particles of sunlight are called _________

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Chloroplasts

photons

• Their thylakoids have the pigment chlorophyll.

• Chlorophyll act like solar panels that transform light energy into energy carriers called and .

• To make and , the thylakoid uses

and makes gas.

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NADPHATP

Photosynthesis: The Light Reaction

NADPHATPwater (H2O)oxygen (O2)

Summary of Light Reactions6 H20

6 O2

ATP

NADPH

What are and used for

in Photosynthesis?

NADPH

ATP

ATP & NADPH energy are used to convert

CO2 into glucoseNADPH

ATP

6 CO2

Sugar!

This is done during the Calvin Cycle in the stroma…

Summary of Photosynthesis6 H20

6 O2

ATP

NADPH

6 CO2

C6H12O6

(sugar)

Calvin Cycle

Photosynthesis Equation:

• The General Formula for Photosynthesis is:

6CO2 + 6H2O + (Light ) C6H12O6 + 6O2 Calvin Cycle Light Reactions Light Reactions Calvin Cycle Light

Reactions

Photosynthesis is responsible for the majority of the biomass

in our biosphere

This biomass supports the upper trophic levels, but only 10% of their energy can be transferred

up the food chain

Let’s play the photosynthesis magnet board race!