Quercus species are the dominant component in

Temperate deciduous forests grow in continental climates with summer rainfall and severe winters. They are dominated by broad leaved deciduous trees like Quercus virginiana, magnolias, boys and hallies as well as such tropical species as Ficus aurea, Lysiloma. Tropical rain forests occupy low altitude zones near the equator where annual rainfall exceeds $80^{\prime \prime}$ to $90^{\prime \prime}$ distributed over the year. Trees generally form three storeys scattered very tall emergent trees, canopy layer and understorey stratum. Tropical scrub forests develop in areas where moisture relations are intermediate between desert and savanna on one hand and rainforest on other.