Photosynthesis

Photosynthesis photo syn thesis photo = __________ syn = __________ Process by which autotrophs convert sunlight into sugars. Auto = __________ Troph = __________ light together put self feed

What Are Autotrophs?

Why do we depend on plants? They make food! We CANNOT make our own food  Thankfully, plants produce glucose -- a food source for all heterotrophs! hetero = __________ troph = __________ different, other feed

What Are Heterotrophs?

How We See Color Sunlight is made up of ALL colors together (wavelengths). Pigments reflect the wavelength of color that we see and absorb the other colors.

Why are plants green? Chlorophyll is a pigment found in the chloroplasts of plant cells. Chlorophyll A is the most important pigment in plants – responsible for the green color. It reflects green and absorbs other wavelengths. That means chlorophyll absorbs a lot more light than it reflects, which is a good thing!

Why do leaves change color in the fall? Why use just one wavelength of light when you can have more? Accessory pigments absorb green and reflect other colors (e.g., red, yellow, or orange) In autumn, leaves stop producing new chlorophyll A, which lets the accessory pigments show through A plant wants to take advantage of multiple wavelengths (including green), so it has other accessory pigments that reflect colors other than green. The accessory pigments absorb light that the chlorophyll can't and then gives the energy to the chlorophyll. Accessory pigments are usually red, yellow, or orange, and they are responsible for the colors of leaves in the fall. The other pigments are always there, but when the weather starts getting colder, the leaves stop making new chlorophyll, which lets the accessory pigments show through. http://blogs.targetx.com/hbu/DawgTracks/fall-leaves.jpg

Photosynthesis Photosynthesis harnesses the sun’s energy and stores it as chemical energy in carbohydrates. Takes place in chloroplasts. Light energy (wavelengths) are absorbed by the pigment chlorophyll.

Photosynthetic Organisms (Autotrophs) http://www.hawaii.edu/reefalgae/invasive_algae/chloro/clad_field_good_small.jpg http://www.wssa.net/photo&info/bmp/lupine.large-leaved.plants.jpg http://english.pravda.ru/img/2005/11/bacteria.jpg http://protist.i.hosei.ac.jp/GIFs/protists.jpg

Organisms that Can Photosynthesize Plants Algae Some protists Some bacteria

Photosynthesis Equation Energy + 6H2O + 6CO2 C6H12O6 + 6O2 Sunlight + Water + Carbon Dioxide Glucose + Oxygen

How Plants Store Energy When chlorophyll absorbs light, it splits water into hydrogen and oxygen, and puts electrons into an excited state (they have extra energy) As the electrons leave the excited state, they release energy and heat The cell converts the energy into ATP and NADPH for storage When chlorophyll absorbs light, the light splits water into H, O2, and electrons. The pigment molecule is then in an excited state (it has extra energy). As the chlorophyll leaves its excited state, it releases little packets of energy and heat. The H adds to NAD+ to make NADPH http://fig.cox.miami.edu/Faculty/Dana/eboost.jpg