The best title for the above diagram is

A. terrestrial food web

B. terrestrial food chain

C. aquatic food web

D. aquatic food chain

How many food chains are in the diagram?

A. Three

B. Four

C. Five

D. Six

Plants with breathing roots are characteristic features of vegetation in

A. tropical grassland

B. temperate grassland

C. saltwater swamp

D. Tropical rain forest

In which of the zones can very few organisms be found

A. I

B. II

C. III

D. IV

Which of the following factors exerts a major effect on the distribution of living organisms in the habitat?

A. Salt

B. pH

C. Light

D. Rainfall

The use of water closet and septic tanks is preferred to the use of
bucket and pit latrines because

A. it is cost effective

B. contaminated faeces are completely kept away from flies

C. the water for flushing contains chlorine which kills the germs

D. It prevents flies from breeding

The detection of vibro cholera in public drinking water is a sign of

A. clean water

B. outbreak of disease

C. water pollution.

D. decayed organisms in the water

Which of the following factors would be least likely to act as a density dependent limiting factor in a population of
mice?

A. Buildup of waste products

B. Predation

C. Parasitism

D. Unfavourable climate

The primary cause of species endangerment is

A. disappearing habitats

B. increase in temperatures

C. acid rain

D. exposure to hazardous wastes

The following pairs of traits are examples of continuous and discontinuous variations respectively except

A. eye Colour and body weight,

B. height and blood group

C. skin colour and fingerprints

D. bodyweight and tongue rolling.