The thick, scarred barks of many savannah trees are the effect of?

A. drought

B. grazing

C. pests

D. fire

Which of the following characteristics clearly distinguishes a mature soil from a juvenile one?

A. Sand fraction greater than 50%

B. Low nitrogen content

C. Well-developed profile

D. Soil pH-value of approximately 6.5

A tropical tree that is often grown in pure stands is the?

A. mahogany

B. teak

C. ebony

D. ironwood

Tropical rain forest are important to the functioning of the earth's environment because they are large reservoirs of?

A. oxygen, mositure and biodiversity

B. timber, wildlife and virgin soils

C. water, energy and mineral resources

D. food, fibre and medicinal plants

The portion of the earth that contains life is the?

A. atmosphere

B. hydrosphere

C. lithosphere

D. biosphere

Which of the following regions has low population density?

A. The Nile Basin

B. The Ganges Basin

C. North Eastern U.S.A

D. The Zarie Basin

One of the tertiary services in an urban centre is?

A. food processing

B. petrol retailing

C. car assembling

D. market gardening

A city may be differentiated from a rural settlement by considering its?

A. population size and age structure

B. skilled and unskilled manpower

C. population and functions

D. road network and industral estates

A settlement located at a place on a plain where several roads meet is likely to be nucleated and?

A. star-shaped

B. circular

C. linear

D. rectangular

Malaysia, Bolivia and Nigeria are noted for the production of?

A. coal

B. natural gas

C. petroleum

D. tin