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