- 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) all living things
C) animals only
D) large animals only
- 3. The skin and the heart are two kinds of
A) organ systems
B) cells
C) organs
D) tissues
- 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) minerals
B) chlorophyll
C) oxygen
D) carbon dioxide
- 6. Vascular tissues are important for the _____.
A) absorption of energy
B) transport of materials
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) minerals
D) sugar
- 8. A plant cell in a nonvascular plant gets water from _____.
A) gravity
B) root pressure
C) diffusion
D) cohesion
- 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) alveoli
B) villi
C) trachea
D) bronchi
- 11. Saliva works to break down starch into_____.
A) vitamins
B) sugars
C) proteins
D) fats
- 12. Where are your kidneys located?
A) next to the liver
B) behind the stomach
C) near the middle of the back
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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