warm up monday november 19th list 5 common household items that you use everyday that come from...

Warm Up Monday November 19th

List 5 common household items that you use everyday that come from plants.

PHOTOSYNTHESIS

The Sunthe ultimate source of allenergy for all life on Earth

Autotrophs Vs. HeterotrophsAn autotroph is an organism that feeds itself!

(produces its own food!)

A heterotroph is an organism that feeds on another organism (cannot produce own food!)

Can you think of an example of each?

Poison Sumac Lions (and Zebras for that matter!)

Autotroph or Heterotroph?

Autotroph or Heterotroph?

Autotroph or Heterotroph?

Autotroph or Heterotroph?

Autotroph or Heterotroph?

PhotoautotrophsPhoto = Light

Auto = Self

Troph = Feed

Plants are “photoautotrophs” because they feed themselves with light.

PHOTOSYNTHESIS…is the conversion of light

energy into chemical energy by living organisms

Prickly Pear Cactus Cedar Tree

Why should I care about

photosynthesis?More than 200 years ago, Priestly

stumbled upon the answer!Who? Me? NO! ME!!!

Joseph Priestly1733-1804

Photosynthesis overview

What Light is Available for Plants to use?

Light acts as both aparticle (photon) anda wave!

The different lengthsof light waves createthe spectrum of colorswe can see!

Red = LONG wavesViolet = SHORT waves

How do plants absorb light?

Pigments in the chloroplast absorb a variety of light energy wavelengths. Examples:

Chlorophyll A & B

Xanthophyll

Carotenoids

Chlorophyll a Found in all plants, algae and

cyanobacteria. Makes photosynthesis possible. Participates directly in light reactions Can accept energy from chlorophyll b

Chlorophyll b Is an accessory pigment Chlorophyll b acts indirectly in

photosynthesis by transferring the light it absorbs to chlorophyll a

Plant PigmentsSeen w/ Paper Chromatography

Absorption SpectrumPlants only absorb violet and red light,

and reflect green light, which is why plants appear green!

Where does Photosynthesis happen?

In Chloroplasts!

What’s in a Chloroplast?

Photosynthesis takes place within the thylakoid membranes!

Light Reactions

Calvin Cycle

Light ReactionsFirst step in photosynthesis

where light energy is converted to chemical energy.

Light energy is used to break apart H2O into H2 & O2.

The H+ ions and the free electrons that result from breaking apart water make high energy molecules!

ATP & NADPH

Light Reactions

The Calvin CycleA set of reactions that turn CO2 into Carbon assembled into glucose. CO2 SugarsThe Calvin Cycle requires energy from ATP & NADPH made by Light Reactions!aka “Dark Reactions” b/c doesn’t need light

Dark Reactions(calvin cycle)

Chemical reactions that convert

CO2 and other compounds into

Glucose!

Doesn’t require light energy.

Takes place in the space outside

the thylakoid membrane.

Photosynthesis