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Name ______________________________ Class ___________________ Date __________________ CHAPTER 1 ACTIVE READING WORKSHEETS THE SCIENCE OF LIFE Section 1-1: The World of Biology Read the passage below, which covers topics from your textbook. Answer the questions that follow. All living things grow, as do many nonliving things. Nonliving things, such as crystals or icicles, grow by accumulating more of the material they are made of. Living things grow as a result of cell division and cell enlargement. Cell division is the formation of two cells from an existing cell. In unicellular organisms, cell division results in more organisms. Newly divided cells enlarge until they are the size of a mature cell. In multicellular organisms, however, organisms grow and mature through cell division, cell enlargement, and development. Read the question and write your answer in the space provided. SKILL: Identifying Main Ideas One reading skill is the ability to identify the main idea of a passage. The main idea is the main focus or key idea. Frequently a main idea is accompanied by supporting information that offers detailed facts about the main idea. 1. What is the main idea of the passage? _________________________________________________________________ Read the question and write your answer in the space provided. SKILL: Vocabulary Development 2. The prefix uni- means “one,” while multi- means “many.” The term nucleate means “having a nucleus.” Use this information to define uninucleate and multinucleate. _________________________________________________________________ _________________________________________________________________ Circle the letter of the word or phrase that best completes the statement. 3. Growth occurs in multicellular organisms because of a. cell division. c. development. b. cell enlargement. d. All of the above Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Modern Biology 1 The World of Biology