1. Which of the following is a characteristic of platyhelminthes? • A. Many pairs of legs • B. Flat body • C. Hard exoskeleton • D. Presence of cnidocytes
2. To which group do sponges belong? • A. Cnidaria • B. Filicinophyta • C. Porifera • D. Mollusca
3. Which process tends to reduce variety within a population? • A. Natural selection • B. Random fertilization • C. Independent assortment • D. Crossing over
4. Which process has the greatest effect in determining which members of a population are most likely to survive until reproductive age? • A. Evolution • B. Natural selection • C. Meiosis • D. Hybridization
5. Which of the following will promote variation in a species? • I. Meiosis • II. Fertilization • III. Natural selection • A. I only • B. II only • C. I and II only • D. I, II and III
6. All of the members of a particular species that live in one area are called a (an)… • A. Biome • B. Population • C. Community • D. Ecosystem
7. Which of the following descriptions about the organization of an ecosystem is correct? • A. Communities make up species, which make up populations. • B. Populations make up species, which make up communities. • C. Species make up communities, which make up populations. • D. Species make up populations, which make up communities.
8. What is the original source of almost all the energy in most ecosystems? • A. Carbohydrates • B. Sunlight • C. Water • D. Carbon
9. Which of the following statements is correct? • A. A community is the place where several different species live. • B. Heterotrophs are organisms that feed off organic matter. • C. Decomposer bacteria are detritivores. • D. A habitat is a community and its abiotic environment.
10. For an environmental factor to be considered biotic, it must be… • A. Living • B. Photosynthetic • C. A decomposer • D. Organic
11. Celiac disease causes the destruction of the villi cells. Which of the following is most likely to happen to people with celiac disease? • A. Incomplete digestion of fats • B. Poor absorption of calcium • C. Increased levels of glucose in blood • D. Damage in the esophagus caused by increase in acid content of the stomach
12. What is the main function of the large intestine? • A. Absorption of water • B. Digestion of fats and proteins • C. Absorption of nutrients • D. Recycling of digestive enzyme