5. The organ systems of plants consist of the root and shoot systems. Why is it important for these organ systems to work together?

A. To grow and survive
C. To survive floods and strong winds
B. To avoid pests and other animals
D. To survive droughts and earthquakes



6. Which of the following differentiates organs from tissues?


A. Organs make up tissues; tissues make up organs
B. Tissues make up organs; cells make up tissues
C. Organs and tissues are made up of cells.
D. Organs and tissues make up an organ system.


7. At which smallest level of organization in an organism can the characteristics of life be carried out?
A. Organ system
C. Tissue
B. Oryan
D. Cell


8. Which is the correct sequence - from biggest to smallest -- of the levels of organization in an organ sm?
- A. Cell Organ - Organ - System - Tissue - Organism - Ecosystem - Population - Biosphere
B. Orxan - Organ System - Tissue - Cell - Biosphere -- Ecosystem - Population - Organism
C. Tissue - Cell - Organ -- Organ System - Ecosystem - Organism - Biosphere - Population
D. Biosphere - Ecosystem - Population - Organism - Organ System - Organ - Tissue - Cell - -



9. A living thing; an individual animal, plant or single-celled life form.
A. Organism
C. Tissue
B. Population
D. Ecosystem​