The water cycle is maintained mainly by

A. evaporation of water in the environment

B. evaporation and condensation of water in the environment

C. condensation of water in the environment

D. transpiration and respiration in plants

Plants of temperate origin can be grown in tropical areas in the vegetation zones of the

A. rain forest

B. guinea savanna

C. sudan savanna

D. montane forest

Organisms living in an estuarine habitat are adapted to

A. withstand wide fluctuations in temperature

B. survive only in water with low salinity

C. withstand wide fluctuations in salinity

D. feed only on phytoplankton and dead organic matter

The presence of stilt roots, pneumatophores, sunken stomata and salt glands are adaptive features of plants found in the

A. tropical rainforest

B. mangrove swamps

C. gressland

D. montane forest

Which of the following animals can exist solely on the water they get from food and metabolic reactions?

A. forest arboreal dweller

B. Desert dwellers

C. forest-ground dweller

D. rainforest dwellers

The most likely first colonizers of a bare rock are

A. mosses

B. ferns

C. lichen

D. fungi

The carrying capacity of a habitat is reached when the population growth begins to

A. increase slowly

B. increase exponentially

C. slow down

D. remain steady

The abiotic factors that control human population include

A. disease and famine

B. space and rainfall

C. flooding and earthquake

D. temperature and disease

An indigenous method of renewing and maintaining soil fertility is by

A. clearing farms by burning

B. planting one crop type

C. adding inorganic fertilizers yearly

D. crop rotation and shifting cultivation

The diseases caused by water-borne pathogens include

A. gonorrhoea and poliomyelitis

B. typhoid and syphilis

C. tuberculosis and cholera

D. typhoid and cholera