Which of the following is an example of discontinuous variation observed in man?
Skin colour
Tongue rolling
Body weight
Height
Correct answer is B
No explanation has been provided for this answer.
Carbon monoxide poisons tissue by
constricting the blood vessels
killing the cells
combining with haemoglobin
rupturing the blood vessels
Correct answer is C
No explanation has been provided for this answer.
What ecological condition favours the breeding of black flies?
Fresh water habitat
Water in ponds and swamp
Water in small containers
Fast flowing streams
Correct answer is B
No explanation has been provided for this answer.
Soil fertility can be conserved and renewed by
yearly monocropping
crop rotation and cover crops
bush burning to remove unwanted debris
avoiding artificial manures
Correct answer is B
No explanation has been provided for this answer.
Mosses
Ferns
Lichens
Grasses
Correct answer is C
No explanation has been provided for this answer.