Nitrogen Fixation and Photosynthesis – Section 1

6. Which of the following molecule is produced from the fixation of CO2 in C4 plants?

A. Malate
B. Oxaloacetate
C. Pyruvate
D. Alpha-ketoglutarate

Correct Answer: B. Oxaloacetate

7. Plants absorb nitrates from soil and convert them into

A. urea
B. ammonia
C. nitrogen
D. none of these

Correct Answer: B. ammonia

8. In the presence of carbon monoxide, nitrogen fixation

A. increases
B. decreases
C. inhibits
D. none of these

Correct Answer: C. inhibits

9. An organism that relies exclusively on pre-synthesized food molecules is

A. autotrophic
B. photosynthetic
C. prokaryotic
D. heterotrophic

Correct Answer: D. heterotrophic

10. In the Calvin cycle of C3 plants, which molecule is the acceptor of CO2?

A. Erythrose-4-phosphate
B. Ribulose-l,5-diphosphate
C. Ribose-5-phosphate
D. Alpha-ketoglutarate

Correct Answer: B. Ribulose-l,5-diphosphate

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