- 1. According to the cell theory, cells are the _____.
A) same in plants and animals
B) basic units of life
C) largest parts of the body
D) smallest particles on Earth
- 2. A substance called glucose provides energy for _____.
A) all living things
B) plants only
C) animals only
D) large animals only
- 3. The skin and the heart are two kinds of
A) cells
B) organs
C) organ systems
D) tissues
- 4. Proteins are assembled at organelles called _____.
A) mitochondria
B) vacuoles
C) chloroplasts
D) ribosomes
- 5. People rely on photosynthesis in plants for food and ____.
A) carbon dioxide
B) minerals
C) chlorophyll
D) oxygen
- 6. Vascular tissues are important for the _____.
A) diffusion of water
B) opening of the stomata
C) absorption of energy
D) transport of materials
- 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) 3
B) 4
C) 2
D) 5
- 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) vitamins
B) proteins
C) sugars
D) fats
- 12. Where are your kidneys located?
A) near the middle of the back
B) between the heart and lungs
C) next to the liver
D) behind the stomach
- 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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