Photosynthesis

Question 1

Overview of Photosynthesis

Answer 1

6CO2 + 6H20 + Light–> 6O2 +C6H12O6

Question 2

Where does CO2 enter the leaf and O2 exits via what?

Answer 2

Stomata

Question 3

Where is H2O delivered to leaves in what?

Answer 3

Xylem vessels

Question 4

Chloroplasts are abundant in what? Which gives them the green pigmentation?

Answer 4

1. Mesophyll cells
2. Chlorophyll

Question 5

Chloroplast Structure

Answer 5

1. Double membrane
2. Stroma: dense interior fluid
3. Thylakoids arranged instacks called grana

Question 6

Where do the light reactions take place?

Answer 6

Thylakoid membrane

Question 7

Where do the dark reactions take place?

Answer 7

Stroma (lamellae)

Question 8

Does a photon of light with shorter wavelength carry more or less energy than a long wavelength? True or False

Answer 8

TRUE

Question 9

Why are plants GREEN?

Answer 9

Reflected light is green

Question 10

What are the several pigments in chloroplasts?

(3)

Answer 10

1. Chlorophyll A
2. Chlorophyll B
3. Accessory pigments: Carotenoids (B-carotene and lutein)

Question 11

What light works best for photosynthesis?

Answer 11

1. Red light
2. Blue/Violet light

Question 12

Two Stages of Photosynthesis

Answer 12

1. Light driven synthesis of ATP and NADPH-light energy converted into chemical energy
2. Calvin Cycle-plant uses ATP and NADPH to synthesize carbohydrates

Question 13

The excited electon can return to its ground state by emitting excess energy in what form? (4)

Answer 13

1. Fluorescence
2. Heat
3. ATP
4. NADPH

Question 14

What is the reaction of splitting water with light energy?

Answer 14

H20–>O2 +2e-

Photolysis

Question 15

Photosystem Complexes have 3 main components

Answer 15

1. Light-harvesting complex: absorb light and transmit it to the photochemical reaction center
2. Photochemical reaction center: Charge separation occurs
3. Primary electron acceptor (STROMA)

Question 16

What are the differences between Mitochondria and Chloroplasts?

(2)

Answer 16

1. Matrix/Thylakoid space
   2.Cristae /Thylakoid Membrane

Question 16

What are the differences between Mitochondria and Chloroplasts?

(2)

Answer 16

1. Matrix/Thylakoid space
2. Critae/Thylakoid Membrane

Question 17

How many molecules of CO2 does it take to synthesize 1 molecule of glyceraldehyde 3-phosphate?

Carbon-fixation Cycle

Answer 17

3, and it takes 9 ATP, 6 NADPH

Question 18

Where does the Carbon-fixation reaction take place?

Answer 18

Begins in stroma-continues in the cytosol

Question 19

Chemiosmosis

Answer 19

Movement of protonts from the thylakoid lumen to the stroma via ATP synthase drives the phosphorylation of ADP to make ATP

Question 20

In PS2 where is water split?

Answer 20

oxygen-evolving center

Question 21

What photosytem is p680+ in?

Answer 21

PSII

Question 22

P700 is in what photosystem?

Answer 22

PS I

Question 23

Low ph in lumen due to what?

Answer 23

H+ concentration

Question 24

How many molecules of CO2, NADPH, and ATP are needed to form 1 molecule of Glyceraldehye 3-phosphate?

Answer 24

3 CO2, 6 NADPH, 9 ATP