What is biological control?
Reveal answer
Using a natural predator to control a pest.
Key words: predator
6(a) FOOD PRODUCTION · RECALL
6.4 Pest control
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Pesticide disadvantages?
Reveal answer
Kills useful species + bioaccumulation + resistance.
Key words: resistance
Biological control disadvantages?
Reveal answer
Slow + not all pests killed + agent may become a pest.
Key words: slow
What is bioaccumulation?
Reveal answer
Toxin concentration increases up a food chain.
Key words: increases
Example of biological control?
Reveal answer
Ladybirds eating aphids.
Key words: ladybirds
What is meant by the term pest?
Reveal answer
An organism that reduces the yield or quality of a crop.
Key words: pest
What is meant by the term pesticide?
Reveal answer
A chemical used to kill pests.
Key words: pesticide
What is meant by the term biological control?
Reveal answer
Using a natural enemy of a pest to reduce its population.
Key words: biological control
What is meant by the term bioaccumulation?
Reveal answer
Build-up of a substance in organisms, increasing in concentration along a food chain.
Key words: bioaccumulation
Pesticides versus biological control: for Speed, give the pesticides and the biological control.
Reveal answer
Pesticides: Fast. Biological control: Slow to take effect.
Key words: Speed
Pesticides versus biological control: for Specificity, give the pesticides and the biological control.
Reveal answer
Pesticides: Often kills non-target species. Biological control: Usually targets one pest.
Key words: Specificity
Pesticides versus biological control: for Residues, give the pesticides and the biological control.
Reveal answer
Pesticides: May persist and bioaccumulate. Biological control: No chemical residues.
Key words: Residues
Pesticides versus biological control: for Resistance, give the pesticides and the biological control.
Reveal answer
Pesticides: Pests may evolve resistance. Biological control: Resistance is less likely.
Key words: Resistance
Pesticides versus biological control: for Risk, give the pesticides and the biological control.
Reveal answer
Pesticides: Toxic to other organisms. Biological control: Control species may become invasive.
Key words: Risk
Pesticides versus biological control: for Effectiveness, give the pesticides and the biological control.
Reveal answer
Pesticides: Can kill most pests. Biological control: Reduces but rarely eliminates pests.
Key words: Effectiveness
True or false, and why? “Biological control eradicates the pest.”
Reveal answer
False. It reduces the population; if the pest disappeared the predator would decline too.
True or false, and why? “Pesticides make pests resistant.”
Reveal answer
False. Pesticides select resistant individuals that already exist in the population.
True or false, and why? “Biological control has no risks.”
Reveal answer
False. Introduced species can harm non-target organisms or become invasive.