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AP Biology Photosynthesis Part 1.

Published byGabriella Dorsey Modified over 6 years ago

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Presentation on theme: "AP Biology Photosynthesis Part 1."— Presentation transcript:

1 AP Biology Photosynthesis Part 1

2 Autotroph - Plants

3 Autotroph - Algae

4 Autotroph - Phytoplankton

5 Autotroph - Bacteria

6 Heterotroph - Animal

7 Heterotroph - Fungus

8 Chloroplasts in plant leaf cells

9 Chloroplast

10 Photosynthesis chemical reaction (Remember… conservation of matter.)
6 CO2 + 6 H2O  C6H12O6 + 6 O2 + Heat

11 Photosynthesis Light Dependent Reactions
These reactions start the process of photosynthesis by using energy from sunlight to create ATP and NADPH. Energy from excited electrons is used to later create glucose.

12 Photosynthesis Calvin Cycle – Light Independent Reactions
These reactions follow the light dependent reactions and use the energy from the stored electrons to create glucose.

13 Electromagnetic Spectrum

14 Absorption vs. Reflection
As we know from Sophomore Biology, chloroplasts absorb all wavelengths of light except for green light. This light is reflected away from the chloroplasts, thus causing most plants to appear green. How do we know that chloroplasts absorb all wavelengths of light except for green? Are there any experiments that could be done to show this phenomenon?

15 Chloroplasts REFLECTING Green Light
White light Refracting prism Chlorophyll solution Photoelectric tube Galvanometer 100 The high transmittance (low absorption) reading indicates that chlorophyll absorbs very little green light. Slit moves to pass light of selected wavelength Green light

16 Chlorophyll ABSORBING Blue light to power photosynthesis
White light Refracting prism Chlorophyll solution Photoelectric tube 100 Slit moves to pass light of selected wavelength The low transmittance (high absorption) reading indicates that chlorophyll absorbs most blue light. Blue light

17 Chloroplasts absorbing the blue and the red light waves
Chloroplasts absorbing the blue and the red light waves. The green is NOT being absorbed.

18 Chlorophyll Molecule (How many electrons are in Mg’s outer shell
Chlorophyll Molecule (How many electrons are in Mg’s outer shell?) Hint: Look at the Periodic Table.

19 Answer: 2 These 2 electrons will be important!

20 Photosystem and collecting sunlight energy.

21 Photosystems 1 and 2

22 Where are the photosystems located?

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