Which tree species is commonly found in the higher elevations of Nagaland?

Alder
Bamboo
Oak
Sal

The correct answer is a) Alder.

Alder is a genus of about 30 species of deciduous trees and shrubs in the birch family Betulaceae. They are native to the Northern Hemisphere, with the greatest diversity in Asia. Alders are typically found in wet or moist habitats, such as riverbanks, swamps, and bogs. They are an important part of the wetland ecosystem, providing food and shelter for a variety of animals. Alders are also used for a variety of purposes, including timber, papermaking, and landscaping.

Bamboo is a grass that is native to tropical and subtropical regions of the world. There are over 1,000 species of bamboo, and they can grow to be very tall and large. Bamboo is a fast-growing plant, and it can be used for a variety of purposes, including construction, furniture, and food.

Oak is a genus of trees and shrubs in the beech family Fagaceae. There are over 600 species of oak, and they are found in temperate and subtropical regions of the Northern Hemisphere. Oaks are an important part of the forest ecosystem, and they are used for a variety of purposes, including timber, furniture, and food.

Sal is a genus of trees in the pea family Fabaceae. There are about 10 species of sal, and they are found in tropical and subtropical regions of Asia. Sal is an important timber tree, and it is also used for a variety of other purposes, including papermaking, fuelwood, and fodder.