- 1. According to the cell theory, cells are the _____.
A) smallest particles on Earth B) largest parts of the body C) basic units of life D) same in plants and animals
- 2. A substance called glucose provides energy for _____.
A) animals only B) plants only C) all living things D) large animals only
- 3. The skin and the heart are two kinds of
A) tissues B) organ systems C) organs D) cells
- 4. Proteins are assembled at organelles called _____.
A) mitochondria B) chloroplasts C) ribosomes D) vacuoles
- 5. People rely on photosynthesis in plants for food and ____.
A) chlorophyll B) carbon dioxide C) oxygen D) minerals
- 6. Vascular tissues are important for the _____.
A) transport of materials B) absorption of energy C) opening of the stomata D) diffusion of water
- 7. To make food, plants use energy from sunlight to combine water and _____.
A) carbon dioxide B) oxygen C) sugar D) minerals
- 8. A plant cell in a nonvascular plant gets water from _____.
A) cohesion B) diffusion C) gravity D) root pressure
- 9. How many chambers are in the human heart _____.
A) 4 B) 5 C) 3 D) 2
- 10. In the lungs, gas exchange occurs in tiny air sacs called _____.
A) villi B) trachea C) bronchi D) alveoli
- 11. Saliva works to break down starch into_____.
A) vitamins B) fats C) proteins D) sugars
- 12. Where are your kidneys located?
A) next to the liver B) behind the stomach C) between the heart and lungs D) near the middle of the back
- 13. What is the main purpose of the Circulatory System?
- 14. What is the main purpose of the Respiratory System?
- 15. What is the main purpose of the Digestive System?
- 16. What is the main purpose of the Excretory System?
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