ACT Success - Science - Practice #8

Group 1

Source 1.1

• The predators reproduce at the same rate as the prey.

• The predator population is directly limited by the availability of prey as a food source.

• Prey are more vulnerable to predation when their population is low.

• Both predator and prey populations grow and decline independently of each other.

• Both populations will remain stable at current levels.

• The prey population will increase before the predator population.

• The predator population will increase before the prey population.

• Both populations will decline at the same time.

• The predator population would immediately increase as predators hunt more prey.

• The predator population would experience a delayed decline as food becomes scarce.

• The predator population would remain stable regardless of prey availability.

• Both predator and prey populations would simultaneously decrease by 50%.

Group 2

Source 2.1

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

• The stratosphere's temperature increases with altitude due to absorption of UV radiation by ozone.

• The stratosphere's temperature decreases with altitude because it lacks solar radiation.

• The stratosphere remains at a constant temperature due to stable atmospheric conditions.

• The stratosphere is influenced primarily by pressure changes rather than temperature.

Group 3

Source 3.1

• Resistor (R)

• Inductor (L)

• Capacitor (C)

• Power supply

• 4 milliseconds

• 6 milliseconds

• 10 milliseconds

• 16 milliseconds

• The oscillation period would double.

• The oscillation period would halve.

• The oscillation period would remain unchanged.

• The current would no longer oscillate.

Group 4

• The enzyme becomes inactive at concentrations above 1.0 mg/mL.

• The reaction rate reaches a maximum because all available substrate molecules are already bound to enzyme molecules.

• Higher enzyme concentrations reduce the temperature of the reaction, slowing it down.

• Excess enzyme molecules inhibit each other, preventing further reaction rate increases.

Group 5

• Species X would decrease its photosynthetic rate, while Species Y would continue increasing its photosynthetic rate than Species X.

• Species X would maintain its maximum rate, while Species Y would have a higher photosynthetic rate than Species X.

• Both species would achieve their maximum photosynthetic rate at 750 lux.

• Species Y’s photosynthetic rate would decrease, while Species X would increase its rate.

Group 6

• 10 J/s

• 15 J/s

• 30 J/s

• 45 J/s