Which of the following vertebrates has the most simple structured heart

A. reptile

B. fish

C. mammal

D. amphibian

One primitive feature of the coelenterates is the possession of

A. a dorsal mouth

B. radial symmetry

C. bilateral symmetry

D. a false foot

A characteristic that best exemplifies the evolutionary advancement of mammals over other vertebrates is the

A. vivparous mode of reproduction

B. possession of paired limbs

C. terrestrial mode of life

D. possession of a heart

An organism which exhibits extracellular digestion is

A. spirogyra

B. paramecium

C. amoeba

D. rhizopus

The causative agent of typhoid fever is

A. salmonella

B. entamoeba

C. escherichia

D. shigella

Grasses recover quickly from bush fires in the savanna because of their

A. perennating organs

B. rapid growth rate

C. fibrous roots

D. succulent stems

Climax communities in a biotic succession are usually characterized by

A. a constant change in the appearance of the communities

B. different species that are constantly changing

C. a stable composition of plant and animal species

D. rapid changes in the plant and animal species

The soil type that contain nutrients which are not readily available for plants is

A. alluvial

B. clayey

C. sandy

D. loamy

A population that doubles in size at constant intervals is an indication of

A. sigmoid growth

B. exponential growth

C. population explosion

D. rapid growth

Hassan and Hussain are identical twins but Hassan grows taller and fatter from Hussain. This is probably because?

A. Hassain inherits genes for tallness and fattness from the father

B. They have dissimilar genotypes

C. Hussain is endowed with genes for shortness and thinness

D. They are raised in different environment