PHOTOSYNTHESIS

All organisms use energy to carry out the functions of life. They obtain this energy directly or indirectly from the sun.

sun

Which organisms absorb energy directly from the sun?

Which organisms absorb energy indirectly from the sun?

Grass, algae, some bacteria

Fish, birds, snake, grasshopper, frog, protists, some bacteria

Animals must eat food to obtain energy.

Heterotrophs are organisms that must get energy from food instead of directly from sunlight.

They must consume food. Animals are consumers.

Examples?

Autotrophs are organisms that absorb energy from sunlight to make glucose.

Plants make their own food.Plants are producers.

plants, algae, and some bacteriaExamples?

Autotrophs, such as plants, capture some of the energy in the sunlight and convert it to chemical energy stored in glucose through the process of photosynthesis.

Photosynthesis takes place in the chloroplasts of plant cells and algae.

Plant cell

chloroplast

CO2 + H2O + light energy C6H12O6 + O2

carbon water glucose oxygendioxide

Photosynthesis:

Photosynthesis also produces oxygen.

IOU chloroplasts!

Chloroplasts carry out photosynthesis --- make food for the cell.

carbon dioxide glucose oxygenwater sunlight+ + +

Photosynthesis:

CO2 + H2O + light energy C6H12O6 + O2

Photosynthesis:

sun

CO2

H2O

GlucoseC6H12O6 O2

Pigments are compounds that absorb certain wavelengths of light and reflect all others.

What wavelength of light does chlorophyll a absorb?

What wavelength of light does chlorophyll b absorb?

What wavelength of light does carotenoids absorb?

Chlorophyll is the primary pigment involved in photosynthesis.

Chlorophyll gives leaves their green color.