Which of the following values showing the total biomass of organisms in a food chain represents the secondary consumer?

A. 40,000

B. 3,000

C. 20

D. 1

Which of the following environmental factors is not considered in a terrestial habitat?

A. Temperature

B. Sunlight

C. Humidity

D. Turbidity

The gas produced during decomposition of matter is

A. hydrogen sulphide

B. carbon monoxide

C. chlorine

D. oxygen

Fish cannot survive on land because it has

A. a body covered with scales

B. a streamlined body

C. no lungs

D. no walking appendages

Pneumatophores are essential for

A. nutrition

B. movement

C. breathing

D. growth

Which of the following will have the least effect on the rate of change of the numbers in a population?

A. food supply

B. mutation

C. predation

D. disease

Competition among individuals of a population increases the

A. number of organisms

B. survival of the fittest

C. availability of nutrient supplied

D. enlargement of the territory

Rabbits cannot survive in an aquatic because they have

A. fore-and hind-limbs

B. no gills

C. no fins

D. no scales

Viruses are pathogens of the following diseases except

A. measles

B. smallpox

C. poliomyelitis

D. tuberculosis

Renewable resources are formed by

A. animals that reproduce sexually

B. organisms confined to forest reserves

C. organisms that are constantly regenerating themselves

D. plants and animals that can reproduce sexually