1. Which of the following is the simplest level of ecological organization? A. A population B. A community C. An ecosystem D. An individual or species 2. 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 B. To avoid pests and other animals C. To avoid floods and strong winds D. To survive droughts and earthquakes 3. Which of the following differentiates organs from tissues? A. Organs and tissues are made up of cells. B. Organs and tissues make up an organ system. C. Organs make up organ system; cells make up tissues. D. Organs make up organ system; tissues make up organs. 4. What level of biological organization is made up of a group of similar cells that perform a specific function? A. Organ B. Organism C. System D. Tissue 5. To which level of biological organization does the picture belong? A. Cell B. Organ C. Organism D. Organism



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