8.1

Question 1

Recall the equation that summarizes photosynthesis.

Answer 1

6CO2+ 12H2O+ Light -> C6H12O6+ 6H2O+ 6O2

Question 2

Specify where photosynthesis occurs.

Answer 2

chloroplasts

Question 3

Identify a key feature of chloroplasts: stomata

Answer 3

allows for gas exchange in leaves

Question 4

Identify a key feature of chloroplasts: thylakoid membrane

Answer 4

internal membrane that contains enzymes to make ATP and chlorophyll and other photosynthetic pigments

Question 5

Identify a key feature of chloroplasts: grana

Answer 5

stacks of flattened sacs of thylakoid membrane

Question 6

Identify a key feature of chloroplasts: stroma.

Answer 6

semiliquid surrounding thylakoid membranes

Question 7

Define carbon fixation.

Answer 7

Light independent reactions; the process wherein photosynthetic organisms (such as plants) turn inorganic carbon into organic compounds (carbohydrates)

Question 7

List the three stages of photosynthesis, and identify which stages are light-dependent and which are light-independent.

Answer 7

1. capture energy from sun- light dependent
2. Mate ATP and reduce NADP+ to NADPH – light dependent
3. Use ATP and NADPH to synthesize organic molecules from CO2- carbon fixation OR light independent

Question 8

Specify where photosynthesis occurs and describe, in general, how it converts light energy into chemical energy.

Answer 8

• Photosynthesis occurs in the chloroplast where is captures energy from sunlight, converts that energy into ATP and reduces NADP+ in NADPH. Then it uses ATP and NADPH to synthesize organic molecules from CO2

Question 9

Identify the chemical equation of photosynthesis and know what is oxidized and what is reduced.

Answer 9

• 6CO2 + 12H2O + Light –> C6H12O6 + 6H2O + 6O2
• H2O is oxidized and CO2 is reduced

Question 10

Name the scientist that described photosynthesis as a multistep process where only part of the process is light dependent.

Answer 10

F.F Blackman

Question 11

Define pigments and identify the pigments involved in photosynthesis.

Answer 11

• molecules that absorb visible light
• Chlorophyll A and B (A is main one; B is accessory pigment)

Question 12

Using an absorption spectrum identify what wavelengths of light are most useful for photosynthesis.

Answer 12

The blue range and red range

Question 13

Relate the absorption spectrum of a pigment to its color.

Answer 13

in a pigment: color is absorbed, only green is reflected
* the wavelength of light that a pigment absorbs depends on the amount of energy needed to boost an electron to a higher orbital

Question 14

Define photon and describe how chlorophyll absorbs photons to excite electrons.

Answer 14

• a tiny particle or bundle of electromagnetic radiation
• Chlorophyl pigments absorb light photon the causes excitation of electrons. The electrons fall from unstable excited state to ground states and gives off photons.

Question 15

Define photosystem and identify the two components of a photosystem.

Answer 15

• functional and structural units of protein complexes involved in photosynthesis
• antenna chlorophyll molecules & reaction center

Question 16

what is the function of the reaction center of a photosystem.

Answer 16

o 1 or more chlorophyll a molecules
o Passes excited electrons out of the photosystem

Question 17

what is the function of the antenna chlorophyll molecules of a photosystem.

Answer 17

o Hundreds of accessory pigment molecules
o Gathers photons and feeds the captured light energy to the reaction center