Light Reactions

Question 1

Oxidation is ?

Answer 1

loss of electrons

Question 2

Reduction is ?

Answer 2

the gain of electrons

Question 3

Chloroplasts are concentrated
in the cells of the _______?

(the green tissue inthe interior of the leaf)

Answer 3

Mesophyll

Question 4

CO2 enters the leaf and the O2 exits by way of tiny pores called ______?

Answer 4

Stomata

Question 5

Site of light-dependent reactions

Answer 5

THYLAKOID

Question 6

Thylakoid stacks

Answer 6

GRANA

Question 6

Formula of Photosynthesis

Answer 6

6CO2 + 6H2O -> C6H12O6 + 6O2

Question 7

Reduction in Photosynthesis

(What part of the formula?)

Answer 7

6CO2 -> C6H12O6

Question 8

Oxidation in Photosynthesis

(What part of the formula?)

Answer 8

6H2O -> 6O2

Question 9

Participates DIRECTLY in light reactions

Answer 9

CHLOROPHYLL A

Question 10

Does NOT participate directly in light reactions

Answer 10

CHLOROPHYLL B

Question 11

Have a PROTECTIVE function

Answer 11

CAROTENOIDS

Question 12

What colors do CHLOROPHYLL A absorbs & reflects

Answer 12

Absorbs: B-V, R-O (blue-violet, red-orange)
Reflects: G (green)

Question 13

What colors do CHLOROPHYLL B absorbs & reflects

Answer 13

Absorbs: B, O (blue, orange)
Reflects: Y-G (yellow-green)

Question 14

What colors do CAROTENOIDS absorbs & reflects

Answer 14

Absorbs: B-G (blue-green)
Reflects: Y-O (yellow-orange)

Question 15

What color of light is least effective in driving photosynthesis?

Answer 15

GREEN

Question 16

Afterglow of when chlorophyll emits heat and photons of light

Answer 16

Fluorescence

Question 17

This chlorophyll a molecule and the primary electron acceptor make up what is called

Answer 17

Reaction center

Question 18

Reaction-center chlorophyll of photosystem II

Answer 18

P680

Question 19

Reaction-center chlorophyll of photosystem I

Answer 19

P700

Question 20

Chemiosmosis production of ATP

Answer 20

Photophosphorylation

Question 21

Generates ATP in cellular respiration

Answer 21

CHEMIOSMOSIS

Question 22

Products of the light reactions

Answer 22

NADPH, ATP and O2

*O2 is a by product

Question 23

PSII primary electron acceptor

Answer 23

PHEOPHYTIN

Question 24

PSI primary electron acceptor

Answer 24

PLASTOCYANIN

Question 25

PSII ELECTRON TRANSPORT CHAIN

Answer 25

1. Pheophytin
2. Plastoquinone
3. Plastoquinone
4. Cyt.b complex

Question 26

PSI ELECTRON TRANSPORT CHAIN

Answer 26

1. Modified chlorophyll a
2. Phylloquinone
3. Iron-sulfur proteins
4. Ferredoxin
5. NADP+ REDUCTASE

Question 27

Why does the cyclic electron flow exist?

Answer 27

1. occurs when the CO2 concentration is less in the atmosphere.
2. when the ratio of NADPH to NADP+ is too high