Photosynthesis, Transpiration & Respiration

What is Photosynthesis?

The process of photosynthesis is a chemical reaction.

It is the most important chemical reaction on our planet.

What is the Equation for the Chemical Reaction of

Photosynthesis?

EQUATIONEQUATION FORFOR PHOTOSYNTHESISPHOTOSYNTHESIS

6CO6CO22 + + 6H6H22OO + +ENERGYENERGY CC66HH1212OO66 + + 6O6O22

CARBON CARBON DIOXIDEDIOXIDE

WATERWATER

GLUCOSEGLUCOSE

OXYGENOXYGEN

Six molecules of carbon dioxide react with six molecules of water to form 1 molecule of

glucose and six molecules of oxygen.

Describe Photosynthesis

Describe Photosynthesis

• The process of changing light energy to chemical energy

• Energy stored as sugar (glucose)

• Occurs in plants and some algae

• Plants need light energy, CO2, and H2O

• Takes place in the chloroplasts, using chlorophyll, the green pigment in plants

Chloroplast

Chlorophyll

What happens during photosynthesis?

What happens during photosynthesis?

• Plants capture light energy and use that energy to make glucose

• Sunlight provides the energy needed by chlorophyll to change molecules of carbon dioxide and water into glucose

• Oxygen is also released in this reaction

What happens during photosynthesis?

• Carbon dioxide enters the leaf through holes called stomata

• CO2 combines with the stored energy in the chloroplasts through a chemical reaction to make glucose

• The sugar is moved through tubes in the leaf to the roots, stems and fruits of the plants

• Some of the sugar is used right away by the plant for energy; some is stored as starch; and some is built into plant tissue

• Photosynthesis Video Clip

Why is this important to us?

TRANSPIRATION

• The process by which liquid water changes into water vapor.

• Transpiration is essentially evaporation of water from plant leaves.

Studies have revealed that about 10 percent of the moisture found in the atmosphere is released by plants through transpiration. http://ga.water.usgs.gov/edu/watercycletranspiration.html

Why is this important to us?

• We cannot make our own food (glucose, energy), we must get our food from plants.

• Plants are the first step in the food chain.• The oxygen released during photosynthesis

is necessary for all living things.

Learn more about photosynthesis at:

http://www.ftexploring.com/me/photosyn1.html

What is Cellular Respiration?

What is Cellular Respiration?

The release of chemical energy for use by cells.

What is Cellular Respiration?

Once the energy that was in sunlight is changed into chemical energy by photosynthesis, an organism has to transform the chemical energy into a form that can be used by the organism.

This process is cellular respiration.

Describe Cellular Respiration

Describe Cellular Respiration

• The breakdown of glucose molecules to release energy

• Takes place in all living things

• Is a step by step process

Cellular Respiration takesplace in the Mitochondria

What is the chemical equation for cellular respiration?

EQUATION FOREQUATION FOR RESPIRATIONRESPIRATION

CC66HH1212OO66 + +

GLUCOSEGLUCOSE

6O6O22

OXYGENOXYGEN

6CO6CO22 ++

CARBON CARBON DIOXIDEDIOXIDE

6H6H22OO + +ENERGYENERGY

WATERWATER

ATPATP

Cellular Respiration Songand

• Cellular Respiration Song.htm

Read more about respiration:

http://www.ftexploring.com/links/respiration.html

Photosynthesis vs. Cellular Respiration

Photosynthesis Cellular Respiration

Occurs in the presence of light (and chlorophyll in plant cells)

Occurs at all times in cells

Requires energy (light) to make glucose (sugar)

Releases energy from glucose (sugar)

Carbon dioxide and water are needed.

Carbon dioxide and water are the waste products.

Oxygen is given out Oxygen is taken in

• Transpiration is the flow of water through a plant.

• Transpiration is essentially evaporation of water from plant leaves.

• Studies have revealed that about 10 percent of the moisture found in the atmosphere is released by plants through transpiration. http://ga.water.usgs.gov/edu/watercycletranspiration.html

• An acre of corn gives off about 3,000-4,000 gallons (11,400-15,100 liters) of water each day, and a large oak tree can transpire 40,000 gallons (151,000 liters) per year. http://ga.water.usgs.gov/edu/watercycletranspiration.html

Transpiration

1. Plants absorb water from the soil.

2. The water moves from the roots to the stems through the xylem vessels to the leaves.

3. Once the water reaches the leaves, some of it evaporates from the leaves through the stoma. Which adds water vapor into the air.

http://www.youtube.com/watch?v=At1BJJDcXhk

Process for Transpiration

1. Would plants and animals be able to survive if photosynthesis did not occur? Why or Why not.

2. Would plants and animals be able to survive if respiration did not occur? Why or Why not.

3. How do the processes of respiration, photosynthesis, and transpiration allow organisms to survive?

Questions to Consider: