Bones are part of which system?

Which is the largest planet in the solar system?

Why does the Moon shine?

Which gas do trees release?

What type of star is the Sun?

Where does digestion begin?

How long does Earth take to revolve around the Sun?

What is the main function of lungs?

What causes a bulb to glow?

What is the melting point of ice?

Which gas do plants take in?

Which phenomenon shows that light travels in a straight line?

Which gas is present most in the air?

What is the path through which electricity flows called?

Which organ circulates blood in the human body?

What is the process by which plants prepare their food?

What is needed for the growth of living things?

Through which medium can sound travel?

Which organ helps us hear?

What are the basic needs of living things?

Which part of the plant carries water upward?

What are the three states of water?

Which material does not conduct electricity?

What is the natural satellite of Earth?

What is the boiling point of water?