ICAS Science

Question 1

What is the main source of energy for Earth?

Accepted Answer

Sun

Answer

The Sun is the primary source of energy for Earth, providing the light and heat essential for nearly all life processes. Its energy drives weather patterns, powers photosynthesis in plants, and ultimately fuels most ecosystems. Without the Sun's energy, Earth would be a frozen, lifeless planet.

Question 2

Which organ pumps blood through the body?

Accepted Answer

Heart

Answer

The heart is a vital muscular organ that functions as the central pump of the circulatory system. It rhythmically contracts to propel blood, rich in oxygen and nutrients, throughout the entire body and to the lungs for reoxygenation. This continuous pumping action is essential for sustaining life.

Question 3

Which material is a good conductor of electricity?

Accepted Answer

Copper

Answer

Copper is an excellent conductor of electricity, meaning it allows electric current to flow through it with very little resistance. This property is due to its atomic structure, which has free electrons that can move readily. Materials like plastic, wood, and rubber are insulators, which resist the flow of electricity.

Question 4

What do plants need to make their own food?

Accepted Answer

Sunlight and water

Answer

Plants produce their own food through a process called photosynthesis. This process requires sunlight as an energy source, water absorbed from the soil, and carbon dioxide from the air. These ingredients are converted into glucose (sugar) for energy and oxygen as a byproduct.

Question 5

Which state of matter has a definite shape?

Accepted Answer

Solid

Answer

A solid is a state of matter characterized by having both a definite shape and a definite volume. Its particles are tightly packed in a fixed arrangement, giving it rigidity. In contrast, liquids have a definite volume but take the shape of their container, while gases have neither a definite shape nor volume.

(ICAS) ICAS Practice Test Practice Test

(ICAS) ICAS Practice Test Practice Test

ICAS Science