1.17 Energy Flow and Photosynthesis

Pages 72-76

Energy

Sunlight is the source of energy for all living things.

Image from kentkedl.com

Step 1

Plants store energy as the carbohydrate glucose.

Image from npic.orst.edu

Step #2

The energy stored in glucose is transferred to ATP.

Image from biotek.com

Photosynthesis

• Green plants Cyanobacteria Plantlike protists

psychedelicporcupine.co.edu serc.blog.si weed-science-classes.wikispaces.com

Cellular respiration

• Occurs in all organisms (plants, animals, fungi, bacteria, protists)

thesun.co.uk plus.google.com scraps20.com

Autotroph

• Producer• Makes its own food

Heterotrophs

• Organisms that rely on other organisms for energy.

Startswithabang.com en.wikipedia.org saberchill.com

Photosynthesis

Chlorophyll, found in chloroplasts, absorbs light energy

light energy + 6 CO2 + 6 H2O 6 O2 + C6H12O6

Chloroplasts

• Thylakoids-interconnected compartments• Grana- stacks of thylakoids• Stroma – fluid• Chlorophyll – green pigment

Light Reactions

• Trap energy from the sun and store it as ATP.

Calvin cycle

Carbohydrates from carbon dioxide

Accessory Pigments

• Orange carotenoids• Yellow xanthophylls• Red anthocyanin