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4. A circuit that allows a current to flow through it is called a c___________ circuit.
7. The nose, w______________, air tubes and lungs make up the human respiratory system
9. A switch c_______________ the flow of the electric current in a circuit.
10. C______________ which traps light for the plant to make food.

1. Cell membrane only allows c___________ materials to pass through.
2. Plants breathe through tiny openings called s____________.
3. The two main gases of air are nitrogen and o_____________.
5. The x___________ or water-carrying tube transport water and mineral salts from the roots to other parts of the plant.
6. The human circulatory system is made up of blood, blood vessels and the h______________.
8. Power stations and batteries are sources of e________________.