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Ans: (d) Pinus – Dioecious
Sol: Pinus is a monoecious plant, i.e., in Pinus the male and female cones or strobili are borne on the same plant.
Select the mismatch. (a) Rhodospirillum – Mycorrhiza (b) Anabaena – Nitrogen fixer (c) Rhizobium – Alfalfa (d) Frankia – Alnus