- 1. According to the cell theory, cells are the _____.
A) basic units of life
B) same in plants and animals
C) largest parts of the body
D) smallest particles on Earth
- 2. A substance called glucose provides energy for _____.
A) plants only
B) large animals only
C) animals only
D) all living things
- 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) chloroplasts
B) vacuoles
C) mitochondria
D) ribosomes
- 5. People rely on photosynthesis in plants for food and ____.
A) carbon dioxide
B) oxygen
C) minerals
D) chlorophyll
- 6. Vascular tissues are important for the _____.
A) opening of the stomata
B) transport of materials
C) diffusion of water
D) absorption of energy
- 7. To make food, plants use energy from sunlight to combine water and _____.
A) sugar
B) carbon dioxide
C) minerals
D) oxygen
- 8. A plant cell in a nonvascular plant gets water from _____.
A) gravity
B) diffusion
C) root pressure
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) bronchi
B) villi
C) trachea
D) alveoli
- 11. Saliva works to break down starch into_____.
A) proteins
B) fats
C) sugars
D) vitamins
- 12. Where are your kidneys located?
A) behind the stomach
B) next to the liver
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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