Photosynthesis

Question 1

Photosynthesis

Answer 1

The Life Process of Planet Earth
- converts solar energy into chemical energy
- source of oxygen and reduced carbon for all other life forms
- basis off life for all higher trophic levels on the planet
- byproduct (Oxygen) transformed the chemistry of planet earth

Occurs in the chloroplast.

Question 2

Autotrophs

Answer 2

Produce organic molecules such as sugar and fat

Question 3

Photoautotrophs

Answer 3

organisms that use light energy and inorganic carbon to produce organic materials

Question 4

What is oxidized and reduced in photosynthesis?

Answer 4

6CO2 + 6H2O -> C6H12O6 + 6O2
- CO2 is reduced
- Water is oxidized

Electrons increase potential energy moving from water to sugar

Question 5

Why are plants green?

Answer 5

Chlorophyll is a green pigment that absorbs light used for photosynthesis. It does not absorb green light which is what makes plants green.

Chlorophyll is in the thylakoid membrane

Question 6

Light Reactions

Input? Output?

Answer 6

The part of photosynthesis that requires light. Powered by redox reactions.
Input: H2O and Light
Output: NADPH, ATP, and O2
1. Light excites an electron in photosystem II, which travels to the cytochrome complex and then to photosystem I.

Occurs in the thylakoid membranes

Question 7

Mobile Electron Carriers

Answer 7

Pq,Pc,Fd
- molecules or proteins that are capable of redox reactions
- “the wires” that move electrons between complexes

Question 8

Chemiosmosis

Answer 8

Chemiosmosis in photosynthesis is driven by protons from the thylakoid space (high) going to the stroma (low concentration) through ATP Synthase. Same as cell resp.

Question 9

What are the steps of the Calvin Cycle?

Answer 9

1. CO2 Fixation
2. Reduction to 3C Sugar (NADPH, ATP) = G3P
3. Regeneration (NADPH, ATP)