Photosynthesis and Organic
Molecule
• 5.1a The energy for life comes primarily from the Sun.
Photosynthesis provides a vital connection between the
Sun and the energy needs of living systems.
• 5.1b Plant cells and some one-celled organisms contain
chloroplasts, the site of photosynthesis. The process of
photosynthesis uses solar energy to combine the
inorganic molecules carbon dioxide and water into
energy-rich organic compounds (e.g., glucose) and
release oxygen to the environment.
The Sun:
• The sun provides solar, or light energy to producers in
ecosystems.
• Photosynthesis is the process that connects the abiotic (sun)
to the biotic (plants)
• The sun supports the energy needs of ecosystems
• During photosynthesis, plants use light energy to convert
inorganic compounds into chemical energy in the form of
glucose
• The inorganic, raw materials used for
photosynthesis are H2O and CO2.
• Plants get water from the ground and carbon
dioxide from the atmosphere
• With light energy, plants convert these inorganic
reactants into the organic product, glucose.
• Plants release oxygen into the atmosphere
Organic Molecules
• Organic molecules have BOTH carbon and
hydrogen in them.
• Organic molecules store chemical energy in the
bonds between their atoms.
• When organic molecules are broken down during
cellular respiration, the energy is released to make
ATP
1.
2.
3.
4.
5.
6.
7.
H2O
CaH2Cl4
C6H12O6
H2O2
NaCl
C4H12P5
CO2
8. CH4
9. C12N6O19
10.C1000H2000O1000
• Photosynthesis uses light energy to convert raw,
inorganic materials from the environment into
glucose, an energy-rich compound.
• Photosynthesis takes place in the chloroplast. An
organelle found ONLY in plants
Photosynthesis
WATER + CARBON DIOXIDE ---> GLUCOSE + OXYGEN
Photosynthesis
WATER + CARBON DIOXIDE ---> GLUCOSE + OXYGEN
H2O
+
CO2
----> C6H12O6 +
O2
Photosynthesis
WATER + CARBON DIOXIDE ---> GLUCOSE + OXYGEN
H2O
+
INORGANIC
CO2
INORGANIC
----> C6H12O6 +
O2
ORGANIC INORGANIC
• Leaves have very small openings where gas
exchange occurs.
• Carbon dioxide comes into the plant, and oxygen
goes out.
• These openings are called stomata
• Water can also escape through the stomata pores
• If too much water is lost, the stomata must close.
• Guard cells are responsible for opening and closing
the openings.
• The guards cells open and close to maintain homeostasis in
the plant cells.
• This is an example of a feedback mechanism.
• A feedback mechanism is one change that leads to a response.
• Too much water lost = guard cells close the stomata
• Water level in homeostasis = guard cells open the stomata
DID YOU LEARN???
• Is sun abiotic or biotic?
• The sun directly provides energy to….?
• What are the raw materials used for
photosynthesis?
• What are the products of photosynthesis?
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•
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•
What is the organic product of photosynthesis?
What is an organic molecule?
What type of energy do organic molecule store?
How can this energy be released?
Why isn’t water organic?
• In which organelle does photosynthesis take place?
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•
•
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What are the opening in leaves called?
What is the purpose of these openings?
What gases are exchanged through the opening?
What else leaves the openings?
• What opens and closes the stomata?
• When do the guard cells close the stomata?
• When do the guard cells open the stomata?
• This is an example of a……
• Why is glucose an “energy rich” molecule?
• In what organelle does photosynthesis take
place??!