GED Science Practice Test 2: Data and Scientific Reasoning

Oxygen production climbs from 12 mL at 10°C to a peak of 48 mL at 40°C, then drops to 30 mL and 6 mL. The relationship is not steady in one direction, so "increased steadily" ignores the last two rows.

Enzymes are proteins whose activity depends on their shape, and too much heat can change (denature) that shape. Freezing is impossible at 60°C, and the enzyme clearly worked at several temperatures, not just one.

A testable hypothesis predicts a measurable result that an experiment can check, here the time until mold appears at two temperatures. "People should always" is a recommendation, and taste is a matter of opinion rather than a measurable result.

The bread type and slice size could affect mold growth, so they must be controlled to make the test fair. Temperature is the independent variable the student changes on purpose, and the number of days is the dependent variable being measured.

The sum of the five times is 1.50 seconds, and 1.50 ÷ 5 = 0.30 seconds. The value 0.28 is the median (the middle value after sorting), and 0.12 is the range (0.37 − 0.25).

Acceleration is the change in speed divided by the time: (12 m/s − 0 m/s) ÷ 4 s = 3 m/s². The value 12 is the final speed, not the acceleration, and 48 comes from multiplying instead of dividing.

Between 4 and 8 seconds the line is flat at 12 m/s, so the speed did not change: the cart kept moving at a constant 12 m/s. A flat line on a speed-time graph means "standing still" only when it lies at a speed of 0.

A white offspring has the genotype bb, so it received one b allele from each parent. The black parent must therefore carry a b allele, making it Bb. A BB parent could pass on only B, so all of its offspring would be black.

Mass is conserved in a chemical reaction, so the mass of the product equals the total mass of the reactants: 4 g + 32 g = 36 g. The coefficient 2 in front of H₂O does not double the mass; 64 g comes from that mistake.

24 days is three half-lives, and the amount halves each time: 200 → 100 → 50 → 25 milligrams. The answer 66.7 comes from dividing 200 by 3 instead of halving three times.

Only a comparison of soil loss between otherwise similar fields, with and without clover, measures erosion directly. Facts about bees, farm size or rainfall may be true but say nothing about whether clover holds the soil in place.

The Sun always lights half of the Moon, and as the Moon travels around Earth our view of that lit half changes. Earth's shadow falls on the Moon only during a lunar eclipse, which is a different event from the monthly phases.

Conduction is the transfer of heat through direct contact, particle to particle, within a solid such as the metal spoon. Convection moves heat through flowing liquids or gases, as in the soup itself, not through a solid handle.

A larger sample reduces the role of chance, and a control group shows whether the volunteers would have burned without the sunscreen; perhaps the afternoon was simply cloudy. Reporting only good results would bias the test rather than strengthen it.

Without insulin, cells cannot take in glucose normally, so it stays in the blood and the level remains high. A drop in blood glucose would be the opposite effect, which is what insulin itself causes.