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