Stanford Achievement Test Stanford Achievement Science Concepts 3

Question 1

What is the basic unit of life?

Accepted Answer

Cell

Answer

The cell is the smallest unit that can carry out all basic life functions, making it the fundamental unit of life.

Question 2

When water vapor cools and changes into liquid water, this process is called:

Accepted Answer

Condensation

Answer

Condensation occurs when water vapor loses heat energy and changes into liquid water, as seen on a cold glass.

Question 3

Which of the following is a renewable energy source?

Accepted Answer

Solar energy

Answer

Solar energy is renewable because the sun continuously produces light and heat that can be converted to electricity.

Question 4

In a food chain, which organism is always the producer?

Accepted Answer

Grass

Answer

Producers are plants that make their own food through photosynthesis, forming the base of every food chain.

Question 5

What causes the seasons on Earth?

Accepted Answer

Earth's tilt on its axis as it orbits the Sun

Answer

Earth's 23.5-degree axial tilt causes different parts of the planet to receive more or less direct sunlight as it orbits the Sun.

Stanford Achievement Test Practice Test