Download 8.2 Photosynthesis Honors Assessment

8.2
Photosynthesis
Honors
Assessment
Which photosynthesis reaction
takes place in the thylakoid
membrane?
Light dependent cycle
1.
What are photosystems and
where are they located?
Photosystems are protein
complexes with light absorbing
pigments
Located in thylakoid membrane
2.
3. What happens to photosystem
II when light strikes it?
Electrons in photosystems are
excited and H2O is split
4.

o

What happens during the first
step of the light dependent
cycle?
electron released in electron
transport system, a
hydrogen ion (H+) released
into thylakoid space
O2 leaves thylakoid space as a
waste product.
5. Why is the splitting of water so
important in the light dependent
cycle?
Electrons are released to
electron transport chain
H+ are released to thylakoid
membrane
What happens to oxygen after
it splits from hydrogen in water?
Two oxygen molecules will join
and leave thylakoid membrane
6.
7. What happens to excited electrons
after they leave photosystem II?
Electrons move along from one
electron acceptor to another.
8. Explain the naming of the
electron transport chain.
Electrons are transported along
the electron acceptors in the
thylakoid membrane.
9. What does light do to PSI in
step 3?
Excites electrons
10.What high energy molecule
is formed as a result of PSI?
NADPH
11. In the fourth step of the light
dependent cycle the
accumulation of H+ in the
thylakoid space leads to what
process?
chemiosmosis
12. What
does ATP synthase do in
the fourth step?
Makes ATP
13. What two molecules are
needed to fuel the light
independent cycle?
NADPH & ATP
14. What
is the other reactant needed
for the light independent cycle?
CO2
15. What happens to the molecules
NADPH and ATP in the light
independent cycle (Calvin Cycle)?
Their energy is used up and the
molecules are turned back into NADP
and ADP.
16. What is the importance of the
enzyme, rubisco?
Converts the remaining G3P
molecules into 5
carbon compounds