PHOTOSYNTHESISPHOTOSYNTHESIS

What is the equation for What is the equation for photosynthesis?photosynthesis?

Where does the Where does the photosynthesis take place photosynthesis take place

in the plant?in the plant? In the In the leavesleaves

In the In the chloroplastschloroplasts – due to the presence of – due to the presence of chlorophyll chlorophyll

Where does the Where does the photosynthesis take place photosynthesis take place

in the plant?in the plant?

What does a plant need to What does a plant need to begin the process of begin the process of

photosynthesis?photosynthesis?INPUTS:INPUTS:

SunlightSunlight

Water (HWater (H22O)O)

Carbon dioxide (COCarbon dioxide (CO22))

Where/how does a plant Where/how does a plant get those items?get those items?

COCO22 – from the – from the stomatastomata. Stomata are . Stomata are “mouth-like” pores on the outside of “mouth-like” pores on the outside of leaves.leaves.

Where/how does a plant Where/how does a plant get those items?get those items?

HH22O – from O – from rootsroots. Travels up through the . Travels up through the roots to the leaves through the roots to the leaves through the xylemxylem (“veins” in plants) (“veins” in plants)

Where/how does a plant Where/how does a plant get those items?get those items?

Sunlight – absorbed by the Sunlight – absorbed by the chloroplastschloroplasts

What does the plant What does the plant make during make during

photosynthesis?photosynthesis?OUTPUTS:OUTPUTS:

Sugar Sugar

Oxygen Oxygen

What happens to the What happens to the oxygen the plant oxygen the plant

makes?makes?It gets released through the It gets released through the stomatastomata

back into the atmosphere for animals back into the atmosphere for animals to breathe in! to breathe in!

What does the plant do What does the plant do with sugar?with sugar?

Sugar is it’s food!Sugar is it’s food!

What does the plant do What does the plant do with sugar?with sugar?

Makes Makes starches/carbohydratesstarches/carbohydrates (a bunch of (a bunch of sugar molecules together) and stores it for sugar molecules together) and stores it for later.later.

What does the plant do What does the plant do with sugar?with sugar?

Plants store their sugars in their Plants store their sugars in their phloemphloem (another “vein” in plants).(another “vein” in plants).

Why do plants want to Why do plants want to store sugar?store sugar?

Plants want to store sugar for when it’s Plants want to store sugar for when it’s dark and they can’t make their own dark and they can’t make their own food. food.

Why do plants need to Why do plants need to be in soil?be in soil?

To get other mineral nutrients from the soil.To get other mineral nutrients from the soil.

Just like you need vitamins for healthy cells – Just like you need vitamins for healthy cells – plants need minerals too!plants need minerals too!

Plants take these mineral nutrients from the Plants take these mineral nutrients from the soil:soil:NitrogenNitrogenPhosphorousPhosphorousSulfurSulfurMagnesium Magnesium PotassiumPotassiumCalciumCalcium

What do plants do with the What do plants do with the mineral nutrients they get from mineral nutrients they get from

the soil?the soil?They use them to make up parts of They use them to make up parts of

their cells.their cells.

Plants use them to make their Plants use them to make their organelles. Remember: everything is organelles. Remember: everything is made of molecules! Plants use those made of molecules! Plants use those mineral nutrients to make more mineral nutrients to make more proteins, lipids, etc…proteins, lipids, etc…

Why do we care about Why do we care about photosynthesis?photosynthesis?

BECAUSE WITHOUT PLANTS, BECAUSE WITHOUT PLANTS, THERE IS NO US!THERE IS NO US!

No plants = No food = No No plants = No food = No animalsanimals

Photosynthesis RecapPhotosynthesis Recap

http://www.nbclearn.com/portal/site/learn/chemistry-now/chemistry-of-green

CELLULAR CELLULAR RESPIRATIONRESPIRATION

Glucose can be used by Glucose can be used by the plant in two ways:the plant in two ways:

1.1.Glucose molecules can be Glucose molecules can be used by the plant as used by the plant as building blocksbuilding blocks. .

2.2.Glucose molecules can be Glucose molecules can be broken down by the plant broken down by the plant to to release energyrelease energy..

Food ≠ EnergyFood ≠ Energy

Be careful…Be careful…

Food ≠ EnergyFood ≠ Energy

Energy = The ability to do Energy = The ability to do workwork

Be careful…Be careful…

Food ≠ EnergyFood ≠ Energy

Energy = The ability to do workEnergy = The ability to do work

Sugar (glucose) does not do Sugar (glucose) does not do work, but it can be broken down work, but it can be broken down thereby releasing energythereby releasing energy..

Be careful…Be careful…

The process doesn’t produce energy directly.In fact, it requires energy.Where does that energy come from?

PhotosynthesisPhotosynthesis

Remember…Remember…

All chemical reactions can All chemical reactions can move in either direction.move in either direction.

What would the reaction for What would the reaction for photosynthesis look like in photosynthesis look like in

reverse?reverse?

Cellular RespirationCellular Respiration

Cellular respiration is the process necessary for ALL living organisms to produce energy.