8. In the presence of carbon monoxide, nitrogen fixation
A.increases
B.decreases
C.inhibits
D.none of these
9. An organism that relies exclusively on pre-synthesized food molecules is
A.autotrophic
B.photosynthetic
C.prokaryotic
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
11. A major plant macronutrient found in nucleic acids and proteins is
A.calcium
B.nitrogen
C.sulphur
D.iron
12. What is the metal ligand in chlorophylls?
A.Copper (Cu)
B.Iron (Fe)
C.Magnesium (Mg)
D.Manganese (Mn)
13. Nitrosomonous and Nitrobacter obtain their carbon for growth from
A.organic compounds
B.carbon dioxide
C.elementary carbon
D.none of these
14. Chlorophyll is associated with
A.thylakoids
B.stroma
C.cristae
D.matrix
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