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