Which of the following is an autotrophic mode of nutrition?

A. Chemosynthesis

B. Saprophytism

C. Parasitism

D. Symbiosis

E. Commensalism

Which of the following is not a way of reducing air pollution?

A. Siting factories and power stations away from residential areas

B. Building tall factory chimneys

C. Passing waste gases through filters and absorbers

D. Using lead-free petrol in cars

E. Recycling tins, cans and bottles

Which of the following factors is not associated with aquatic habitat?

A. Temperature

B. Light intensity

C. Turbidity

D. Wave action

E. Humidity.

Which of the following types of soil has the highest water-retaining capacity?

A. Clay

B. Laterite

C. Loam

D. Gravel

E. Sand

Changes in energy flow between organisms in a habitat can be represented by a

A. pyramid of biomass

B. pyramid of numbers

C. pyramid of energy

D. food chain

E. food web

Which of the following processes is not involved in the carbon cycle?

A. Burning

B. Decay

C. Transpiration

D. Respiration

E. Photosynthesis

Which of the following processes are involved in a water cycle?

A. Evaporation, condensation and precipitation

B. Evaporation, percolation and transpiration

C. Evaporation and precipitation

D. Evaporation and transpiration

E. Precipitation and condensation.

Water in the human body is derived from the following sources except through

A. drinking water

B. food substances

C. cytoplasm of worn-out cells

D. respiratory activity

E. absorption by the skin

The conservation of natural resources can be achieved by the following except

A. creation of national parks

B. formation of conservation societies and agencies

C. establishment of game reserves

D. deregulated harvesting

E. making laws on conservation

Water rises most rapidly in

A. sandy soil

B. clayey soil

C. sandy-loam soil

D. loamy soil

E. humus soil