Which organ helps us hear?

Where does digestion begin?

Which is the largest planet in the solar system?

What is the melting point of ice?

What is the natural satellite of Earth?

Bones are part of which system?

How long does Earth take to revolve around the Sun?

Which gas do plants take in?

What is needed for the growth of living things?

What are the three states of water?

What is the main function of lungs?

Through which medium can sound travel?

What type of star is the Sun?

Why does the Moon shine?

What is the process by which plants prepare their food?

What is the boiling point of water?

Which part of the plant carries water upward?

What is the path through which electricity flows called?

What causes a bulb to glow?

Which organ circulates blood in the human body?

What are the basic needs of living things?

Which gas do trees release?

Which gas is present most in the air?

Which phenomenon shows that light travels in a straight line?

Which material does not conduct electricity?