Major Biomes

Quercus is the genus of oak trees.
Oaks are broad-leaved trees that shed their leaves in autumn and are typical of regions with a moderate climate and well-defined seasons.
They are the dominant trees of temperate deciduous (broad-leaved) forests, along with trees such as maple, beech and chestnut.
In India, oak forests occur in the temperate zone of the Himalayas.
Tropical rain forests are dominated by tall evergreen trees, scrub forests by thorny shrubs, and alpine forests by conifers such as fir and by rhododendrons.
So Quercus species are the dominant component in temperate deciduous forests.

Savanna is a tropical grassland with scattered trees, typically Acacia; correctly matched.
Coniferous forests (taiga) are dominated by evergreen trees such as pine, spruce and fir; correctly matched.
Tundra is the treeless cold region where the subsoil remains permanently frozen (permafrost); correctly matched.
Prairie is a temperate grassland dominated by grasses with very few trees.
Epiphytes (plants growing on other plants, such as orchids) are characteristic of tropical rain forests, not of grasslands.
So the mismatched pair is prairie - epiphytes.