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