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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

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7. Plants absorb nitrates from soil and convert them into

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

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8. In the presence of carbon monoxide, nitrogen fixation

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

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

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

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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

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