Which of the following natural resources is most readily available to all organisms?
Water
Oil
Food
Air
Mineral salts
Correct answer is D
No explanation has been provided for this answer.
The following practices are aimed at soil conservation except
contour ridging
Applying manure
strip cropping
bush clearing
crop rotation
Correct answer is D
No explanation has been provided for this answer.
The following are useful measures for forest conservation except
preventing and controlling accidental forest fire
encouraging the use of charcoal for industrial and domestic purposes
combating and preventing plant diseases
planting trees in depleted forests
protecting young growing trees
Correct answer is B
No explanation has been provided for this answer.
Preventing erosion could best be achieved by
crop rotation and mulching
contouring slopping ground and afforestation
grazing terracing and shifting cultivation
strip cropping and poaching
bush fallowing and crop rotation
Correct answer is B
No explanation has been provided for this answer.
Which of the following is not an effect of over-crowding in a population?
Death
Competition
Commensalism
Aggression
Cannibalism
Correct answer is B
Commensalism is a long-term biological interaction in which members of one species benefits while those of the other species neither benefit nor are harmed.
Hence, commensalism is not an effect of overcrowding.