Photosynthesis - reactions

Question 1

NADP

Answer 1

A co-enzyme that helps an enzyme do its job

Question 2

Site of light dependant reactions

Answer 2

• occurs in the thylakoid membrane

Question 3

Light dependant reaction process

Answer 3

1) Light energy is absorbed by chlorophyll

2) Excites electrons in chlorophyll meaning they move to a higher energy level

3) These electrons move along the electron transport chain in redox reactions - as they move along they lose energy

4) When the excited electrons move from photostem II to photostem I they get replaced by electrons from photosynthesis - light energy splits water into H+ ions, electrons and oxygen.

5) This causes photophosphorylation of ADP with inorganic phosphates to ATP

6) The electrons are transferred to NADP with a H+ ion to form reduced NADP

Question 4

Light dependant reactions - reactants

Answer 4

ADP
Inorganic phosphates
NADP
Water

Question 5

Light dependant reactions - products

Answer 5

Reduced NADP
Oxygen
ATP

Question 6

Site of light independent reactions

Answer 6

The stroma

Question 7

Light independent reactions process (calvin cycle)

Answer 7

1) Carbon dioxide enters the leaf and combines with RuBP catalysed by by enzyme rubisco

2) This is carbon fixation and it produces GP (a 3 carbon sugar)

3) GP will be reduced using the ATP and reduced NADP. from the light dependant reaction

4) This makes GALP (another 3 carbon sugar)

5) 2 GALP combine together to form glucose

6) The remaining GALP will resynthesise RuBP using ATP

Question 8

Light independent reactions - reactants

Answer 8

ATP
Reduced NADP
Carbon dioxide
RuBP

Question 9

Light independent reactions - products

Answer 9

Glucose
ADP
Inorganic phosphates
NADP