Unit 3 – ENERGY Conversion. The Sun is the ultimate source of energy on Earth. Then what?. Plants convert the SOLAR ENERGY into CHEMICAL ENERGY (glucose and other high-energy carbs) Julius Mayer discovered this conversion in 1845. Energy flow through ecosystems.
Can PRODUCERS do both?
Can CONSUMERS do both?
Why are eukaryotes able to be larger and more complex than prokaryotes?
Mitochondria and chloroplasts…
Several Centuries Ago, The Question Was:Plants tend to grow… WHY?
Does the increase in mass of a plant come from the air? The soil? The Water?
Repeated Priestly experiment with & without sunlight
Proposed That Plants can Convert Light Energy Into Chemical Energy
Used Isotopes To Determine That The Oxygen Liberated In Photosynthesis Comes From Water
Ruben and Kamen = the O’s in oxygen gas comes from the O’s in water (breaking water molecules during light rxns). Used isotope of oxygen to trace its path.
6CO2 + 6H2O C6H12O6 + 6O2
Where does photosynthesis take place?
Why are plants green?
Pigment-Light absorbing molecule
Often stored in vacuoles
During the fall, what causes the leaves to change colors?
1.Light Reaction or Light Dependent Reaction -
Plant + Light = OXYGEN!
2. Calvin Cycle or Light Independent Reaction
phosphate molecules is released when a
phosphate molecule breaks off.