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passage 4
P1
Sometimes there is no more effective means of controlling an agricultural pest than giving free rein to its natural predators. █ ████ ██ █████ ██ ███ ████████ █████ █ ████ █████ ██████████ ███ ██ ███████████ ██████████ ██ █ █████████ ████ ██ ███ █████ █████████████ ███
Intro topic ·
Controlling cyclamen mites using Typhlodromus mites
Problem ·
Infestation of strawberry plants by cyclamen mites
Solution ·
Typhlodromus mites
Attack in second year of infestation, when cyclamen mite populations reach damaging levels
P2
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Introduce explanation ·
Several reasons why Typhlodromus is a good solution
Reason 1: Voracious appetite
Reason 2 ·
Typhlodromus population grows as quickly a cyclamen's
Both reproduce by parthenogenesis
Reasons 3 and 4 ·
Reproductive timing and alternative sources of food
Reason 3: Typhlodromus only reproduces when cyclamen prey is available.
Reason 4: Typhlodromus has other food sources, allowing it to survive when cyclamen mites are scarce.
Draw similarity ·
Typhlodromus is similar to other predators that control prey
Because of reasons 1-4
P3
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Support solution ·
Experiments correlate presence of Typhlodromus with lower cyclamen populations
P4
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Implications of experiment ·
Pesticide use can cause more harm than good...
...if pesticides kill predators like Typhlodromus
Reinforce implications ·
Where pesticide (parathion) used, Typhlodromus absent and cyclamen populations higher
Again, correlation between presence of Typhlodromus and lower cyclamen populations
Passage Style
Problem-analysis
Single position
22.
Which one of the following ██ █████████ ██ ███ ███████ ██ █ ██████ ████████████ ██ ███ █████████████ ██ ████████████ ██ █ █████████
a
its ability to █████████ ████ ████████████ ██████ █████████
b
its lack of ███████ █████████ ██ ██████████ ██████
c
its ability to ████ ██ █████████ ████████ ██ █████████ ██████████ ███████
d
its constant food ██████ ██ ████████ ████ ███████████
e
its ability to ███████ ████ ███ ████ ███ █████████