Soil micro-organisms are beneficial because of their involvement in

• A. photosynthesis
• B. translocation
• C. cycling of nutrients
• D. respiration using soil air

The group of insects that have mouth parts adapted for both piercing and sucking is

• A. cockroach, aphids and mosquitoes
• B. aphids, houseflies and moths
• C. mosquitoes, tse-tse flies and aphids
• D. aphids, beetles and grasshoppers

Which of the following groups of diseases are associated with water? I Onchocerciasis II Schistosomiasis III Dracunculiasis IV Elephantiasis V Taeniasis

• A. I, II and III
• B. II, IV and V
• C. II, III and IV
• D. I, II and V

The correct increasing order of size for the cell components responsible for heredity is

• A. chromosome → DNA → nucleus → gene
• B. DNA → gene → chromosome → nucleus
• C. chromosome → nucleus → DNA → gene
• D. DNA → gene → nucleus → chromosome

The caste of termites that lacks pigmentation is the

• A. King
• B. worker
• C. soldier
• D. queen

One of the ways which body cells differ from gamete cells is in the

• A. type of centromeres they contain
• B. number of chromosomes pairs they contain
• C. type of chromatide they contain
• D. number of chromosomes they contain

The procaryotic cell type is characterized by a

• A. complex cytoplasm in which different regions are poorly defined
• B. localization of different regions of the cell into tissues
• C. collection of organelles and macromolecular complexes
• D. simple cytoplasm with well defined regions

After one week of life, the weight of five chicks of the same sex hatched simultaneously from the eggs of the same hen and fed on the same diet were 45g, 40g, 35g, 33g and 30g. This is an example of

• A. growth rate
• B. natural selection
• C. variation
• D. mutation

A group of organisms of different species living in a particular area is described as a

• A. colony
• B. community
• C. population
• D. niche

The organism that has a hydrostatic skeleton is

• A. Tilapia
• B. Hydra
• C. mosquito larva
• D. earthworm