Photosynthesis

Question 1

Equation for photosynthesis

Answer 1

6CO2 + 6H2O —> C6H12O6 + 6O2

Question 2

Role of photosynthesis

Answer 2

To provide food and oxygen for all organisms

Question 3

Light stage occurs in…

Answer 3

The granum of the chloroplast
Needs light

Question 4

Dark stage occurs in…

Answer 4

The stroma of the chloroplast

Question 5

Chlorophyll is

Answer 5

Green pigment in chloroplast

Question 6

Function of chlorophyll

Answer 6

Absorbs light

Question 7

Chloroplast is

Answer 7

Where photosynthesis takes place
Contains chlorophyll

Question 8

Light Stage — Pathway 1

Answer 8

1. Electrons are passed along an electron transport chain
2. Energy released and used to make ATP
   ADP + P + energy —> ATP (goes to dark stage to make glucose)
3. Electrons return to chlorophyll

Question 9

Names for pathway 1

Answer 9

Cyclic photo phosphorylation
Cyclic electron flow

Question 10

Light Stage — Pathway 2

Answer 10

1. Energised electrons are passed to NADP+ and form NADP-
2. NADP- combines with H+ (from a proton pool) to form NADPH
3. Photolysis: H2O is split into H+, E- and O2
4. Energy from electrons used to make ATP

Question 11

End products of light stage:

Answer 11

ATP
NADPH
H2O (split) (H, O, E-)

Question 12

Where do the end products of the light stage go?

Answer 12

ATP and NADPH are used in the dark stage
O2 is used in plant respiration or released into the air

Question 13

Dark stage name

Answer 13

Calvin cycle

Question 14

Necessities for dark stage

Answer 14

Stroma
Enzyme controlled
Temperature (25°C)
No light needed
Needs NADPH (for H ions) and ATP (for energy)

Question 15

The dark stage