Explanation
Why Correct: Sal is the dominant tree in Bankura's dry deciduous forests, and Sundari is the characteristic mangrove of the Sundarbans in South 24 Parganas. These two pairs are correctly matched, giving exactly two correct pairs.
Distractor Analysis: Examining the statements: Coochbehar lies in the sub-Himalayan terai region where natural forests are dominated by sal, teak, and other tropical species, not pine, which grows in the Himalayan foothills at higher altitudes. Purba Medinipur's coastal vegetation features casuarina and other littoral species, while baobab is an introduced exotic tree not native to that district's natural habitat.
Takeaway: West Bengal's forest types range from tropical dry deciduous in the west to littoral and swamp forests along the coast, with the Himalayan forests in the north supporting conifers like pine at elevations above 1,000 metres.