Photosynthesis & Respiration

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Transcript Photosynthesis & Respiration

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?
EQUATION FOR
PHOTOSYNTHESIS
WATER
6CO2 + 6H2O +ENERGY
CARBON
DIOXIDE
OXYGEN
C6H12O6 + 6O2
GLUCOSE
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
Why is this important to us?
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.
• Mr. Parr's Photosynthesis song
• https://www.youtube.com/watch?v=SYoHcES
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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
• The breakdown of glucose molecules to
release energy
• Takes place in all living things
• Is a step by step process
Cellular Respiration takes
place in the Mitochondria
What is the chemical equation
for cellular respiration?
EQUATION FOR
RESPIRATION
CARBON
DIOXIDE
GLUCOSE
C6H12O6 + 6O2
OXYGEN
ATP
6CO2 + 6H2O + ENERGY
WATER
Cellular Respiration Song
and
• Mr. Parr
https://www.youtube.com/watch?v=FHWbjnz
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• HIGH SCHOOL LEVEL
https://www.youtube.com/watch?v=KK7JN
oRjlOw
Read more about
respiration:
http://www.ftexploring.com/links/respiration.
html
Photosynthesis vs. Cellular
Respiration
Photosynthesis
Cellular Respiration
Occurs in the presence of
Occurs at all times in cells
light (and chlorophyll in plant
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
Questions to Consider:
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?
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.
l
http://ga.water.usgs.gov/edu/watercycletranspiration.htm
Cool Fact
• An acre of corn gives
off about 3,000-4,000
gallons (11,40015,100 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
Process for Transpiration
1. Plants absorb water from the soil.
2. The water moves through 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=At1BJJDcXh
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Learn more about
photosynthesis and
transpiration at:
http://www.ftexploring.com/me/photosyn1.html