Photosynthesis

How do we grow a plant?

But is that all????

Plants need to do Photosynthesis

Chlorophyll inside

What you don’t see…

Photosynthesis- what goes in?

Sunlight (light Energy)

Water H2O

Carbon Dioxide CO2

Photosynthesis- what comes out?

Sunlight (Light Energy)

WaterH2O

Carbon Dioxide

CO2

GlucoseC6H12O6

OxygenO2

Photosynthesis Let’s write the chemical equation

on the board!!

What are the reactants, What are the products?

Reaction

CO2 + H2O + light O2 + C6H12O6 But it’s not balanced 6 CO2 + 6 H2O + light 6 O2 + C6H12O6

Reactants Products

What type of energy transformations are going on?

Photosynthesis has an “opposite” reaction… ALL cells must perform this

reaction – (not like photosynthesis that only

occurs in autotrophs)– Occurs in Mitochondria– It’s why we breathe

In fact the name we give to breathing is named after this cellular process

– Any guesses???

Cell RespirationGlucoseC6H12O6

OxygenO2

Carbon Dioxide

CO2

WaterH2O

Energy

Cell Respiration Let’s draw the chemical formula

on the board!!

What are the reactants, What are the products?

What type of energy transformations are going on?

It’s a cycle in plant cells, Jennnnay

The process of cellular respiration is taking place in your cells right now!!

You are currently taking in oxygen and burning sugars within the mitochondria to release chemical energy.

This process is also known as Aerobic Respiration. Why?– Because Oxygen is present which

allows your cells to burn glucose into energy much more efficiently.

– I am sure you have heard of Aerobics.

What would happen if your cells were deprived of oxygen?? Would they still be able to burn glucose to make energy?? YES!! Fermentation

– When might this occur?– Long distance runners often create an

anaerobic environment for their cells What does anaerobic mean??

– No Oxygen present– Not a very energy efficient process

and a bad side effect is produced: Lactic Acid

A different example of fermentation Breweries rely on this process:

– Yeast cells need energy to survive, so they will breakdown sugars in anaerobic conditions and a byproduct is alcohol.

– How do you know CO2 is produced?

Fermentation Anaerobic Animals produce lactic acid and

CO2 Plants produce ethyl alcohol and

CO2

Less efficient…pgs 124-125– Aerobic respiration yields at least 36

ATP– Anaeorobic nets a measly 2 ATP

Let’s fill in this chart with the molecules and then the energy transformations

_________________________________

_____________________

_________________________________

_____________________

Why do leaves change colors??

Chlorophyll B

Chlorophyll A

Xanthophyll

Carotene

These chromatograms show chlorophyll b at the bottom, followed by chlorophyll a, xanthophylls, and carotenes.