Photosynthesis

Uses light energy to make food (glucose) in plants

Equation for Photosynthesis

6CO2 + 6H2O + Sunlight C6H12O6 + 6O2

Carbon dioxide + water + sunlight glucose + oxygen

• Occurs in green leaves

-The leaves have cells that contain Chloroplasts

-Chloroplasts contain a green pigment called chlorophyll

Chlorophyll has the ability to change light energy into chemical bond energy

Chlorophyll absorbs red and blue light and reflects green light.

chloroplast

Chlorophyll – pigment in chloroplasts

• Two types: chlorophyll a and chlorophyll b

• Absorb red and blue light

• Reflect Green light

• Having both a & b enable plants to absorb light from a wider region of the spectrum

• What color light would be best for plants to grow in?

Red & Blue

Photosynthesis only occurs in the light.

Provides most of the oxygen in our atmosphere.

The rate of photosynthesis depends on:

Temperature ( ENZYMES)

Light Intensity

Amount of CO2 available

Amount of Water available

Photosynthesis is the opposite of cellular respiration

• Photosynthesis• Occurs in

Chloroplasts• Energy Storage• Uses: CO2 + H2O +

light energy• Makes: C6H12O6

(glucose) + O2

• Aerobic Respiration• Occurs in

Mitochondria• Energy Release• Uses: C6H12O6

(glucose) + O2

• Makes: CO2 + H2O+ chemical energy (ATP)

Cellular Respiration