The adaptive importance of the nuptial flight from termite colonies is to

A. ensure cross-breeding between members of one colony and another

B. disperse the reproductives in order to establish new colonies

C. provide abundant food for birds and other animals during the early rains

D. expel the reproductives so as to provide enough food for other members

The sequence of the one-way gaseous exchange mechanism in a fish is

A. gills ⇢ operculum ⇢ mouth

B. mouth ⇢ gills ⇢ operculum

C. mouth ⇢ operculum ⇢ gills

D. operculum ⇢ mouth ⇢ gills

In the nitrogen cycle, the nitrates in the soil are converted to atmospheric nitrogen by

A. puterfying bacteria

B. nitrogen-fixing bacteria

C. nitrifying bacteria

D. denitrifying bacteria

The relationship between a termite and the protozoam in its intestine is described as

A. predation

B. saproplytism

C. symbiosis

D. parasitism

Exo-erythrocytic phase of the life cycle of malaria parasite occurs in the

A. liver of humans

B. reticuloendothelial cells of humans

C. Malphigian tubules of mosquito

D. brain of humans

Which of the following organs regulates the levels of water. salts, hydrogen ions, and urea in the mammals?

A. Kidney

B. Colon

C. Bladder

D. Liver

The rate of transpiration is NOT affected by

A. the weight of the stomata pores

B. humidity

C. temperature

D. the size of the stomata pores

The crossing of individuals of the same species with different genetic characters is

A. croos breeding

B. polygenic inheritance

C. non-disjunction

D. inbreeding

The hereditary characters in plants and animals are located on the

A. gene

B. mucleus

C. chromosome

D. cell

The arrangement of ovules attached to the sides of a syncarpous ovary with a single chamber is referred to as

A. free-central placentation

B. axile placentation

C. parietal placentation

D. marginal placentation