CAM and C4 Photosynthesis

Question 1

Which of the following molecules are transferred between Mesophyll cells and bundle sheath cells during C4 photosynthesis?
I. Oxaloacetate
II. Phosphoenolpyruvate
III. Malate
IV. CO2
V. Pyruvate

A. III only B. IV only C. III and V D. II ,III and V

Answer 1

C. III and V

Question 2

Which of the following statements expresses a correct idea about C4 and CAM plants?

A. C3 and C4 plants physically separate light and dark reactions
B. C4 plants separate light and dark reactions physically while CAM
plants do not
C. CAM plants separate light and dark reactions physically while C4
plants do not
D. C4 plants carry out carbon fixation during the day and dark reactions during the night

Answer 2

D. C4 plants carry out carbon fixation during the day and dark reactions during the night

Question 3

Which of the following is TRUE regarding photorespiration?

A. Carbon is lost during photorespiration and is released as CO2
B. RuBisCo can bind O2but cannot utilize it as a substrate and the enzymatic reaction is halted.
C. CO2 is used in place of O2 leading to the loss of carbon during the Calvin cycle
D. RuBisCo uses RuBP and O2 to generate a 6-carbon molecule during
photorespiration.

Answer 3

C. CO2 is used in place of O2 leading to the loss of carbon during the Calvin cycle

Question 4

What enzyme is involved in CO2 fixation of Calvin cycle ?

Answer 4

B. RuBisCo

Question 5

How many ATP and NADPH is used for the regeneration of 6RuBp molecules?

Answer 5

6 ATP only

Question 6

How is photosynthesis similar in C4 and CAM plants?

Answer 6

In both cases, rubisco is not used to fix carbon initially

Question 7

Which process is most directly driven by light energy?

A. ATP Synthesis
B. carbon fixation in the stroma
C. reduction of NADP+ molecules
D. removal of electrons from chlorophyll molecules

Answer 7

D. removal of electrons from chlorophyll molecules

Question 8

Global changes concern farmers. In particular, their attempts to grow corn in northern latitudes may suffer because:

Answer 8

C4 plants such as soybeans thrive in very dry climates

Question 9

Which is most important in helping CAM plants overcome the problem of photorespiration?

A. they reduce CO2 levels in their leaves
B. they capture CO2 at night as oxaloacetate
C. they close their stomates when O2 levels are high
D. they separate the light reactions from the dark reactions

Answer 9

D. they separate the light reactions from the dark reactions

Question 10

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

A. Only heterotrophs require oxygen
B. Cellular respiration is unique to heterotrophs
C. Only heterotrophs require chemical compounds from the environment
D. Autotrophs, but not heterotrophs , can nourish themselves
beginning with CC2 and other nutrients that are inorganic.

Answer 10

C. Only heterotrophs require chemical compounds from the environment