WAEC - Biology (2002 - No. 35)
Which of the following measures is most likely to cause a damage to the ecosystem in the control of pests
and weeds?
and weeds?
Use of ladybird insects to feed on aphids
introduction of bacterium to kill larvae of butterfly
Introduction of Tilapia fish in ponds to feed on mosquito larvae
Spraying insecticides to destroy cotton- stainers in a cotton-field