GED Science Test #7 3

Question 1

A scientist observes that a population of bacteria doubles every 20 minutes under ideal conditions. What type of growth pattern does this represent?

Accepted Answer

Exponential growth

Answer

Exponential growth occurs when a population multiplies by a constant factor over equal time intervals, such as doubling every 20 minutes.

Question 2

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Ice is less dense than liquid water due to hydrogen bonding

Answer

Water molecules in ice form a crystalline lattice held together by hydrogen bonds, creating a less dense structure than liquid water.

Question 3

During photosynthesis, what happens to carbon dioxide molecules?

Accepted Answer

They are converted into glucose using light energy

Answer

In photosynthesis, plants use light energy to convert carbon dioxide and water into glucose and oxygen.

Question 4

A car traveling at 60 mph applies its brakes and stops after 4 seconds. What physical concept explains the car's resistance to stopping?

Accepted Answer

Inertia

Answer

Inertia is the tendency of an object in motion to remain in motion, which causes the car to resist the change in its state of motion.

Question 5

Which layer of the Earth is responsible for generating Earth's magnetic field?

Accepted Answer

The outer core

Answer

Earth's magnetic field is generated by the movement of molten iron and nickel in the liquid outer core.

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