ICAS Science 3

Question 1

Which layer of Earth is made of molten rock and is located directly beneath the crust?

Accepted Answer

Mantle

Answer

The mantle is the thick layer of partially molten rock beneath Earth's crust, and its movement drives plate tectonics.

Question 2

A student notices that plants near a window grow toward the light. This response is called:

Accepted Answer

Phototropism

Answer

Phototropism is the growth response of a plant toward a light source, controlled by the hormone auxin.

Question 3

Sound travels fastest through which medium?

Accepted Answer

Steel

Answer

Sound travels fastest through solids like steel because the particles are closely packed, allowing vibrations to transfer more quickly.

Question 4

Which process do green plants use to convert sunlight into food?

Accepted Answer

Photosynthesis

Answer

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce glucose and oxygen.

Question 5

If a scientist repeats an experiment five times and gets similar results each time, this supports which conclusion?

Accepted Answer

The results are reliable

Answer

Consistent results across multiple trials indicate that the experiment's findings are reliable and reproducible.

(ICAS) ICAS Practice Test