Plants do both: photosynthesis and respiration. The Photosynthetic Reaction.
PHOTOSYNTHESIS What do you need for Photosynthesis?
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Transcript of PHOTOSYNTHESIS What do you need for Photosynthesis?
PHOTOSYNTHESIS
What do you need for Photosynthesis?
Four things are needed for photosynthesis:
Travels up from the roots
WATER
CARBON DIOXIDE
Enters the leaf through small holes on the underneath (stoma)
SUNLIGHT
Gives the plant energy
CHLOROPHYLL
The green pigment where the chemical reactions happen
PHOTOSYNTHESIS
What does photosynthesis
make?
PHOTOSYNTHESIS
Oxygen (waste)
Food for plant (glucose)
PHOTOSYNTHESIS
waterwater+Carbon Carbon dioxidedioxide
sugasugarr
+Oxygen
PHOTOSYNTHESIS
Oxygen (waste)
Food for plant (glucose)
The sun
Carbon dioxide from the air
Water from the soil
Where does PHOTOSYNTHESIS take
place?
Plant CellPlant Cell
Cell wall
nucleus
Cell membrane
vacuole
Chloroplasts!!
PHOTOSYNTHESIS
Chloroplasts are the GREENGREEN parts of a plant cell.
They contain a chemical called CHLOROPHYLL.CHLOROPHYLL.
Chlorophyll is a catalyst.catalyst.
A catalyst speeds up a chemical reaction, but doesn’t get used itself.
Checking for Understanding
• In which organelle or cell structure does photosynthesis occur?
A. cell wallB. cell membraneC. Golgi apparatusD. chloroplast
Four factors affect Four factors affect photosynthesis:photosynthesis:1. Light – if there is more light photosynthesis
happens faster
2. Water – if there is not enough water photosynthesis slows down
3. Temperature – the best temperature is about 300C – anything above 400C will slow photosynthesis right down
4. CO2 – if there is more carbon dioxide photosynthesis will happen quicker
Energy and Living Things
• Autotrophsorganisms that can make their own energy or food
Energy and Living Things
• Heterotrophsorganisms that must obtain energy or food from other organisms
Checking for Understanding
• What’s the ultimate source of energy for plants?
• How do heterotrophs obtain energy?
Photosynthesis
• The key cellular process that produces energy.
• Autotrophs like plants use energy from sunlight to convert water, carbon dioxide into oxygen and high energy carbohydrates.
What plants do
6CO2 + 6H2O C6H12O6 + 6O2
Carbon dioxide plus water in the presence of sunlight yield sugars/carbohydrates and oxygen.
Checking for Understanding
• In addition to chlorophyll and light, photosynthesis requires
A. water and oxygenB. water and sugarsC. oxygen and CO2
D. Water and CO2
• The products of photosynthesis are
A. sugars and oxygen
B. sugars and CO2
C. water and CO2
D. hydrogen & oxygen
How plants do it, an overview.
• The capture the energy of the sunlight with absorbing pigments.
• Pigments are housed within plant cell organelles– Chloroplasts
• Most common plant pigment is CHLOROPHYLL
Hopefully now you can be like this student.
And not like this one!