Plants that are highly tolerant of drought and can survive in dry habitats are referred to as?

A. hydrophytes

B. mesophytes

C. tropophytes

D. xerophytes

An important characteristics of the B-horizon in tropical ferruginous soils is the?

A. eluviation of oxides

B. concentration of organic matter

C. accumulation of oxides

D. predominance of parent material

The texture of the soil depends on the constitution of?

A. silt and humus

B. sand, clay and stones

C. sand, silt and clay

D. sand, clay and quartz

The most significant economic use of ocean water is for ?

A. drinking

B. bathing

C. transportation

D. recreation

The major terrestrials ecosystems are often referred to as?

A. biomes

B. biomass

C. grasslands

D. boreal forests

Global warming directly results in?

A. melting ice cap and rising sea level

B. corrion of roofing sheets

C. increasing in atmospheric pressure

D. population explosion and rapid urbanization

Accelerated soil erosion result from a combination of?

A. bad farming practice and mulching

B. intensive cultivation and cover crops

C. bad farming practices and fertilizers

D. intensive cultivation and overgrazing

Which of the following factors discourages population concentration in area?

A. Grasslands

B. Frozen soils

C. Mineral deposit

D. Alluvial plains

The ratio of registered births to the population of women of child-bearing age is known as the?

A. fertility rate

B. mortality rate

C. growth rate

D. morbidity rate

The number of deaths, births, immigrants and emigrants over a specified time interval determines the population

A. density

B. change

C. growth

D. structure