PT124.S4.P4.Q26 > Analytics

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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

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Solution · Typhlodromus mites

Attack in second year of infestation, when cyclamen mite populations reach damaging levels

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Introduce explanation · Several reasons why Typhlodromus is a good solution

Reason 1: Voracious appetite

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Reason 2 · Typhlodromus population grows as quickly a cyclamen's

Both reproduce by parthenogenesis

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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.

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Draw similarity · Typhlodromus is similar to other predators that control prey

Because of reasons 1-4

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Support solution · Experiments correlate presence of Typhlodromus with lower cyclamen populations

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Implications of experiment · Pesticide use can cause more harm than good...

...if pesticides kill predators like Typhlodromus

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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

26.

Which one of the following ██████ ██ █████ ████ ██████████ ███ ████████ ████████ █████████ ███ █████████ █████████████ ██ ███ ███████████ █████ █████████ █████ █████████ ██ ███ ████████

The individual Typhlodromus █████ ████ ████ ███ ███████ ████████████ ████ █████ █████████ ████ ███ ███ ████████ ██████ ██ ████ ███ ████

It’s not clear how learning some facts about individual T-mite egg-laying rates can help show the practicality of using T-mites.

The insecticides that ███ █████████ ████ ███ ████ ███████ ██ ██████████ ██████ ████ ████ █████████ ███ ████████████ ███████ ██ ██████

This, if anything, is something that goes against the practicality of T-mites. The typical insecticides used on strawberry plants will end up killing the T-mites.

12%

In areas in █████ ██████████ ██████ ██████ ████████ ██ ████████ ██████ ███████ ████ ██ ██ █████ ███ ██████████ █████

This doesn’t strengthen, because T-mites have seasonal synchrony with C-mites. So the length of the winter doesn’t make T-mites more or less practical to use. T-mites will simply be synchronous with C-mites regardless of the length of winter.

Typhlodromus are sometimes ██████ ████ ██ ███████ ███████ ██ █████ ████ ██ ██████ ███████████ ██ ██████████

Learning that another mite kills T-mites doesn’t help establish the practicality of T-mites. It would be more helpful to learn that T-mites don’t have predators that could decrease their population in the areas we want them to control C-mites.

Typhlodromus easily tolerate ███ ████ █████ ██ ████████ ██████████ ████ ██████████ ██████ ███

This strengthens the practicality of T-mites by showing that they can actually be generally used on strawberry plants. Imagine if (E) were not true — in that case, T-mites wouldn’t be as practical as a solution for C-mites, because they couldn’t survive in all the places strawberry plants are used. By helping to establish that they can survive where strawberry plants are used, (E) provides a reason for the practicality of T-mites as a way to control C-mites.

76%

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PrepTest 124 - Section 4 - Passage 4 - Question 26

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PrepTest 124 - Section 4 - Passage 4 - Question 26

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