ACT Success - Science - Practice #7

• The rate of photosynthesis would increase continuously.

• The rate of photosynthesis would remain stable but high.

• The rate of photosynthesis would decline due to light stress.

• The rate of photosynthesis would drop to zero.

• An environment where salinity fluctuates between 6% and 8%.

• An environment where salinity is consistently around 2%.

• An environment where salinity remains above 10%.

• An environment where salinity fluctuates between 5% and 10%.

• Higher concentrations of CO₂ reduce oxygen production due to toxicity effects on algae.

• Oxygen production in algae is unaffected by CO₂ levels beyond 2%.

• Algae require at least 4% CO₂ to produce maximum oxygen levels.

• Algae do not use CO₂ for oxygen production, so the decrease is unrelated to CO₂ levels.

Group 2

Source 2.1

• These months have higher rates of precipitation, which temporarily raises ocean surface levels.

• Ocean surface levels rise due to increased evaporation and subsequent condensation in the atmosphere.

• Ocean surface levels are influenced by moderate temperatures, which prevent excessive evaporation or condensation.

• The gravitational pull of the moon is strongest in May and October, leading to peak surface levels.

• January and July

• May and October

• April and September

• March and August

• Increased sunlight and temperatures lead to greater evaporation, lowering surface levels.

• Increased rainfall raises the ocean surface, followed by a drop due to evaporation.

• Atmospheric pressure decreases during these months, pushing the surface levels downward.

• Wind currents are stronger in these months, causing temporary drops in surface levels.

Group 3

Source 3.1

• Brand K heavy duty

• Brand P heavy duty

• Brand E alkaline

• Brand D alkaline

• The voltage would remain high for a longer period, extending beyond 5 hours.

• The voltage curve would likely drop at the same rate as in the incandescent test.

• The voltage would start lower initially and decline rapidly.

• The voltage would increase steadily over time due to reduced power demand.

• Between 2 and 3 hours

• Between 3 and 5 hours

• Between 5 and 6 hours

• Between 6 and 8 hours

Group 4

Source 4.1

• Rust formation decreases as pH increases, with more rust in acidic solutions.

• Rust formation is highest in neutral conditions and decreases in both acidic and basic environments.

• Rust formation is directly proportional to pH, with the most rust forming in basic conditions.

• Rust formation is independent of pH and occurs equally in all solutions.

• The rate of rust formation would exceed that observed at pH 6.0, as a more acidic environment accelerates corrosion.

• Rust formation would be similar to that at pH 6.0, with only slight differences in the amount of rust.

• Rust formation would be slower than at pH 6.0 but faster than at pH 7.0.

• Rust formation would decrease significantly compared to pH 6.0.

• River water with a pH of 6.0

• Rainwater with a pH of 7.0

• Sea water with a pH of 8.0

• Freshwater lake with a pH of 10.0