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

---