2/ biolicalconreol Flashcards
What is biological control
Use organisms that are natural predators, parasites or pathogens to reduce number of pests in an area
What is function of owls in biological control
rats - palm oil plantation
What is function of bacillus thuringiensis
Rhinoceros beetle - palm oil plantation
What is function of guppy
Mosquito larvae - pond
What is function of ladybird beetle
Eats aphid - crop pest
What is function of ducks
Snails & insects - paddy field
What is advantage of biological control
More environmental friendly
Cheaper
Doesn’t affect human heallth
What is disadvantage of biological control
Takes long time before effect seen
Balance of ecosystem might be disrupted - new species introduced
What influences population size
Disease
Prescence of predators
Source of food
Change of weather
What causes changes in ecosystem
Limited water supply
Migration
Change in population size
What are activities that destroy ecosystem
Forest logging
Industrialisation
Agriculture
Waste disposal
