Botany - Plant Kingdom Question with Solution | TestHub

In Pinus, both male and female cones (strobili) are borne on the same tree, which makes it a monoecious plant.

In Cycas, male cones and megasporophylls are borne on different trees, so it is a dioecious plant[cite: 13].

Salvinia is a pteridophyte that produces two kinds of spores (macro or large and micro or small spores), making it heterosporous.

Equisetum produces only one kind of spores of similar size, making it a homosporous pteridophyte.

Therefore, the mismatched pair is Pinus with Dioecious.