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Photosynthesis Practice

Total questions: 45

Worksheet time: 1hrs 22mins

Name
Class
Date
1.
What is the primary function of the light reactions of photosynthesis?
a)
To produce glucose
b)
To produce NADPH and ATP
c)
To use ATP
d)
To produce RuBP
2.
What is the function of NADP+?
a)
It absorbs light
b)
It is an electron carrier
c)
It is a light-reflecting pigment
d)
It acts as long-term energy storage
3.
Which of the following molecules is not needed for the Calvin Cycle?
a)
CO2
b)
ATP
c)
NADPH
d)
H2O
4.
The light reactions occur in the ________ and the dark reactions take place in the ________.
a)
Chloroplast / thylakoid membrane
b)
stroma / thylakoid
c)
mesophyl / stomata
d)
thylakoid membrane / stroma
5.
Where does the carbon come from that is used to form glucose?
a)
The soil
b)
CO2 in the air
c)
From other carbohydrates
d)
Calvin Cycle
6.
Where does the carbon come from that is used to form glucose?
a)
The soil
b)
CO2 in the air
c)
From other carbohydrates
d)
Calvin Cycle
7.
Where does the Calvin cycle take place?
a)
stroma of the chloroplast
b)
thylakoid membrane
c)
outer membrane of the chloroplast
d)
interior of the thylakoid membrane
8.
When oxygen is released as a result of photosynthesis, it is a direct by-product of
a)
reducing NADP+
b)
splitting water molecules
c)
chemiosmosis
d)
electron transfer in photosystem II and I
9.
What is the primary function of the Calvin cycle?
a)
regenerate ATP for use in the light reactions of photosynthesis
b)
produce carbon dioxide for use in the light reactions of photosynthesis
c)
produce oxygen by oxidizing water
d)
produce simple sugars from carbon dioxide
10.

The H+ concentration gradient is formed to

a)

make NADPH

b)

split a water molecule

c)

generate ATP

d)

form water

11.

Rubisco is important in which step of photosynthesis

a)

energizing the electrons in chlorophyll

b)

carbon fixation when CO2 is connected to RUBP during calvin cycle

c)

regeneration phase as RUBP is made during calvin cycle

d)

reduction of the carbon chain during the calvin cycle

12.

If the proton (H+) pump in the thylakoid was not working which molecule could not be made during the light reaction?

a)

NADPH

b)

ATP

c)

Water

d)

Oxygen gas

13.

Which of the following would have the least affect on photosynthetic rate?

a)

increase the temp from 20°C to 30°C

b)

increasing the CO2 from 400 ppm to 600ppm

c)

increasing the light intesity from 40 Watts to 60 Watts

d)

increasing the amount of O2 from 20% to 30% in the air

14.

ATP is made during the light reaction using all of the following EXCEPT

a)

proton pump

b)

hydrogen ion gradient

c)

electron energy from photosystem II

d)

NADPH donating electrons

15.
What is the main role of the pigment molecules in a light-harvesting complex in the thylakoid membranes?
a)
split water and release oxygen to te reaction-center chloropyll
b)
transfer light energy to the reaction-center chlorophyll
c)
synthesize ATP
d)
transfer electrons to NADPH
16.

Main products of the Calvin Cycle

a)

Oxygen, NADP+, ADP

b)

Glucose, CO2, ADP

c)

ADP, NADP+, Glucose

d)

ATP, NADPH, Oxygen

17.

5 carbon sugar that combines with CO2 in the Calvin Cycle

a)

3-PGA

b)

G3P

c)

RuBP

d)

Glucose

18.

Which of the following is true of the Calvin Cycle?

a)

carbon dioxide and energy (ATP and NADPH) are used to make organic compounds

b)

energy is absorbed from sunlight and converted to chemical energy stored in ATP and NADPH

c)

Occurs in the thylakoid

d)

Occurs in the cytoplasm

19.

Increasing carbon dioxide can increase photosynthesis, but only to a maximum rate because

a)

There are not enough RuBP molecules

b)

Oxygen cannot leave fast enough

c)

Large amounts of CO2 cannot fit in the chloroplast

d)

Calvin cycle can only go as fast as the light reactions

20.

Temperatures that are too high can slow photosynthesis because

a)

stomata stay open

b)

enzymes are ruined

c)

there is not enough CO2

d)

there is too much water

21.
In the Calvin Cycle, ________ and ________ from the light dependent reactions convert PGA into G3P
a)
O2, ATP
b)
CO2, H2
c)
ADP, NADPH
d)
NADPH, ATP
22.
After 12 G3P molecules are created, 10 are used to regenerate _________, while the other 2 are used to create __________.
a)
RuBP, C6H12O6
b)
Glucose, CO2
c)
ATP, Glucose
d)
Glucose, RUBP
23.
The first molecule formed after CO2 is added to the Calvin Cycle is:
a)
RuBP
b)
G3P
c)

PGA

d)

Rubisco

24.
The molecule that comes out of the Calvin Cycle to produce glucose, and polymers like cellulose is:
a)
RuBP
b)
GP3
c)
3-PG
d)
G3P
25.
Which of the following molecules is not needed for the Calvin Cycle?
a)
CO2
b)
ATP
c)
NADPH
d)
H2O
26.

What is the main product of the Calvin Cycle?

a)

Stroma

b)

Thylakoids

c)

Glucose

d)

Water

27.

What is the second stage of the Calvin Cycle?

a)

Carbon fixation

b)

Reduction

c)

Regeneration of RUBP

d)

Secondary

28.

What is the first stage of the Calvin Cycle?

a)

Carbon fixation

b)

Reduction

c)

Regeneration of RUBP

d)

Primary

29.
How many G3P molecules make one molecule of glucose? 
a)
1
b)
2
c)
3
d)
4
30.
What happens to the remaining G3P molecules in the last step of the dark reactions?
a)
They are used to make glucose.
b)
They are reshuffled to make CO2 by adding ATP.
c)
They exit the cycle.
d)
They are reshuffled to make RuBP by adding ATP. 
31.
How many carbons does G3P have?
a)
1
b)
2
c)
3
d)
6
32.

Calvin Cycle can occur without ATP

a)

True

b)

False

33.

What does the Calvin Cycle begins with?

a)

Glucose

b)

The input of CO2

c)

Water

d)

ATP synthase

34.
What supplies the electron that is lost in PS II?
a)
oxygen
b)
water
c)
glucose
d)
rubisco
35.
What is the purpose of splitting water in PS2 of the light dependent reaction?
a)
Provides e- for PS2 and H+ for the thylakoid space
b)
To produce Oxygen for animals
c)
There is no purpose
36.
It is important to create a concentration of H+  in the thylakoid space so that the H+ can diffuse through_________ to create ______.
a)
ATP synthase, ATP
b)
NADH, NADPH
c)
proton pump, protons
37.
Which of the following is NOT a product of the light reactions?
a)
ATP
b)
NADPH
c)
Oxygen
d)
Glucose
38.
Protons move into the thylakoid due to the
a)
concentration gradient in the stroma
b)
  Brownian motion of the protons.
c)
  peer pressure of the cool electrons in the stroma.  
d)
movement of electrons through the electron transport chain
39.

Choose the statement that best describes light reaction.

a)

It converts CO2 to sugar molecule

b)

It converts light energy to chemical energy of ATP and NADPH

c)

It takes place in the stroma

40.

Which of the following is not needed to start the light reaction

a)

H2O

b)

ADP + P

c)

CO2

41.
In the ________________________, energy from the sun is used to make ATP 
a)
light-independent reaction
b)
dark reaction
c)
light-dependent reaction
d)
Calvin cycle
42.
Water is split during
a)
photosystem 1 of the light dependent reaction
b)
photosystem 2 of the light dependent reaction
c)
calvin cycle
d)
cell respiration
43.

What does light do when it strikes the chlorophyll molecules of photosystems I and II?

a)

Light causes glucose to be synthesized directly inside the chlorophyll molecules of the photosystems.

b)

Light causes electrons to get excited (gain energy) and travel down the electron transport chain embedded in the thylakoid membrane.

c)

Light causes the conversion of water into carbon dioxide, oxygen, and electrons.

d)

Light directly causes carbon dioxide to attach to RuBP during the carbon fixation stage of the Calvin Cycle.

44.

Q-1. Pigment(s) in a chloroplast

a)

Carotene

b)

Chlorophyll a

c)

Chlorophyll b

d)

Chlorophyll c

45.

Q-8. Which is the correct statement about the light-independent stage of photosynthesis?

a)

A. Photosynthesis involves two photosystems where pigments absorb energy from light

b)

B. Water will provides energy in the form of electron that moves from photosystem I to photosystem II

c)

C. reduced NADP is formed as a final product of cyclic photophosphorylation

d)

D. Electron carrier in photosystem I will decrease the energy of ATP gradually before the ATP is sent to light-independent stageD.

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