The basic factor on the basis of which the world is divided into major natural regions is:

1. temperature
2. area
3. water
4. climate

In different natural regions human activities differs when there is dominance of:

1. agriculture
2. animal husbandry
3. forestry
4. all of the above.

Equatorial forests : Broad-leaved evergreen trees :: ……………. : deciduous trees

1. Tropical grasslands
2. Tropical monsoon forests
3. Mediterranean forests
4. Temperate grasslands

The top layer formed by the crowns of trees which grow close together:

1. understorey
2. canopy
3. emergent layer
4. forest floor