Which gas do trees release?

Through which medium can sound travel?

What is the main function of lungs?

Which organ helps us hear?

Bones are part of which system?

How long does Earth take to revolve around the Sun?

What is the melting point of ice?

What is the process by which plants prepare their food?

What are the three states of water?

Which phenomenon shows that light travels in a straight line?

Which part of the plant carries water upward?

Which is the largest planet in the solar system?

Which gas do plants take in?

What type of star is the Sun?

Which gas is present most in the air?

What is the boiling point of water?

Where does digestion begin?

What is the natural satellite of Earth?

What causes a bulb to glow?

Why does the Moon shine?

What is needed for the growth of living things?

Which organ circulates blood in the human body?

What is the path through which electricity flows called?

What are the basic needs of living things?

Which material does not conduct electricity?