Detoxification of urea takes place in the?

• A. pancreas
• B. heart
• C. liver
• D. testes

Spines and shells on animals are adaptation for

• A. camouglage
• B. chemical defence
• C. physical defence
• D. mimicry

The following observations concerning succession are true except that the

• A. pioneer community has fewer species
• B. middle stages communities are most diverse
• C. max community has the greatest number of species
• D. total biomass of the community increases as succession progresses

They key event in the transition of the amphibians from water to land is the

• A. replacement of the gills with lungs
• B. possession of webbed limbs
• C. development of long hing limbs
• D. possession of tympanic membrane

(a) Explain the following terms:

(i) test cross

(ii) monohybrid cross.

(b) In a mango plant the, the allele for bean-shaped seed is r and is recessive to round-shaped seed R. With the aid of a genetic diagram, determine the genotypes of the offspring if:

(i) a homozygous bean-shaped parent with a homozygous round shaped parent;

(ii) a heterozygous bean-shaped parent is crossed with a heterozygous round shaped parent.

The structure labelled VIII in the diagram is responsible for

• A. vision
• B. involuntary actions
• C. speech
• D. voluntary action

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

An example of a fruit that develops from a single carpel is

• A. okro
• B. tomato
• C. bean
• D. orange

The offspring produced when pure strains interbreed is described as

• A. dominance
• B. phenotype
• C. allele
• D. hybrid

Production of naked seeds is a distinctive feature of the group of plant called

• A. grasses
• B. conifers
• C. legumes
• D. palms