Post on 18-Jan-2018
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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.