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1Which of the following is NOT a mixture?

A Saltwater B Air C Sugar D Iron

2What is the main function of an indicator in a science experiment?

A Measure temperature B Determine acidity or basicity C Create energy D Support weight

3Which organelle is known as the powerhouse of the cell?

A Ribosome B Mitochondrion C Nucleus D Golgi apparatus

4What is the process by which plants make their own food called?

A Photosynthesis B Respiration C Digestion D Circulation

5Which of the following is a non-living factor in an ecosystem?

A Sunlight B Trees C Rivers D Wind

6What is the function of the male reproductive system?

A Producing eggs B Producing sperm C Carrying the baby D Controlling hormones

7Which of the following is a contact force?

A Gravity B Magnetism C Friction D Electricity

8What happens to an acid when it reacts with a base?

A It becomes more acidic B It becomes neutral C It becomes basic D It evaporates

9Which of the following is a heterogeneous mixture?

A Air B Milk C Sugar solution D Saltwater

10What is the smallest unit of life?

A Cell B Atom C Molecule D Organism