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Page 1:   · Web view1 Scientists study the natural world by observing. 2 That means they use their senses ... how would you define the word . observe? ... 2.What do scientists do after

Name________________________________Class____________________Date____________________

Skills Worksheet

CH1.1Active Reading

Section: The Nature of ScienceRead the passage below. Notice that certain sentences are numbered. Answer the questions that follow.

1 Scientists study the natural world by observing. 2 That means they use their senses to notice characteristics of objects and living things and to learn information about natural events. Scientists use their observations to formulate questions. Questioning is a key feature of scientific thought. 3 Scientific thought is also based on skepticisma doubting attitude. Scientists look carefully and questioningly at evidence used to support ideas. They do not simply accept opinions. 4 For example, according to conventional wisdom, stress is the cause of stomach ulcers. 5 However, some scientists studying this problem could not find any evidence to support the cause-and-effect relationship. 6 So they examined microorganisms in the stomachs of people with and without stomach ulcers. 7 They found people with ulcers had higher levels of bacteria called Helicobacter pylori in their stomachs than other people did. 8 Extensive research has shown that these bacteria cause stomach ulcers.

SKILL: READING EFFECTIVELYRead each question, and write your answer in the space provided.1. Based on Sentence 2, how would you define the word observe?

________________________________________________________________________________________________________________________________

2. Based on Sentence 3, how would you define the word skepticism?________________________________________________________________

3. Use context clues to explain what conventional wisdom is.________________________________________________________________________________________________________________________________

4. A possible cause-and-effect relationship is presented in Sentence 4. What is it?________________________________________________________________________________________________________________________________

Active Reading continued

SKILL: RECOGNIZING CAUSE AND EFFECTRead each question, and write your answer in the space provided.

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Biology 14 Biology and You

Page 2:   · Web view1 Scientists study the natural world by observing. 2 That means they use their senses ... how would you define the word . observe? ... 2.What do scientists do after

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5. Based on Sentence 5, how did some scientists assess this cause-and-effect relationship and why?________________________________________________________________________________________________________________________________

6. How did these scientists find evidence of a different cause-and-effect relationship? Which sentence supports your answer?________________________________________________________________________________________________________________________________________________________________________________________________

7. What have scientists found to be a cause of stomach ulcers?________________________________________________________________

8. Based on this paragraph, what would scientists do if they found that the cause for stomach ulcers you gave in Question 8 did not seem to explain why some people had stomach ulcers?________________________________________________________________________________________________________________________________

In the space provided, write the letter of the term or phrase that best answers the question.

______ 9. To learn more about stomach ulcers, what did the scientists described in the paragraph do?a. They recorded what people with stomach ulcers ate.b. They gauged the stress levels of people with and without stomach

ulcers.c. They observed the microscopic organisms in the stomachs of people

with and without ulcers.d. They accepted the conventional wisdom about the cause for stomach

ulcers.Skills Worksheet

1.2 Active Reading

Section: Scientific MethodsRead the passage below. Then answer the questions that follow.

Scientists make progress the same way a sculptor makes a marble statue—by chipping away at unwanted bits. If a hypothesis does not provide a reasonable explanation for what has been observed, the hypothesis is rejected. Scientists come up with new hypotheses, which they test with new experiments. If a new hypothesis is supported with one study or experiment, scientists may rerun their study and experiment several times. This helps them verify the conditions under which their hypothesis is supported. They also confer with other scientists. They read many scientific publications.

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Biology 15 Biology and You

Page 3:   · Web view1 Scientists study the natural world by observing. 2 That means they use their senses ... how would you define the word . observe? ... 2.What do scientists do after

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They want to see if the results of their experiments are supported by the work of other scientists.

If a group of related hypotheses are very well supported and explain a great amount of data, scientists may put the hypotheses together in their formulation of a theory. A theory is a general explanation for a broad range of data. A theory differs from a hypothesis in scope. A hypothesis is a specific testable prediction for a limited set of conditions. A theory is a generally accepted principle that has been highly tested and that helps explain many observations.

SKILL: READING EFFECTIVELYRead each question, and write your answer in the space provided.1. What causes a hypothesis to be rejected?

________________________________________________________________________________________________________________________________________________________________________________________________

2. What do scientists do after they reject a hypothesis?________________________________________________________________________________________________________________________________________________________________________________________________

3. What is the main difference between a hypothesis and a theory?________________________________________________________________________________________________________________________________________________________________________________________________

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Biology 16 Biology and You

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Active Reading continued

SKILL: ORGANIZING INFORMATIONIn the spaces provided, write the term or phrase from the Word Box that best completes each statement.4. The graphic organizer below illustrates the making of a theory.

In the space provided, write the letter of the term or phrase that best answers the question.

______ 5. Why might a scientist rerun an experiment if the experiment is shown to support a hypothesis?a. to support a related hypothesisb. to check to see if the experiment continues to support the hypothesis c. to see if the results of his/her experiments are supported by the work

of other scientistsd. to prove a theory to other scientists

Skills Worksheet

1.3 Active Reading

Section: Tools and TechniquesRead the passage below. Then answer the questions that follow.

Measurements taken by scientists are expressed in metric units. The official name of the metric system is the International System

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Biology 17 Biology and You

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of Measurements, abbreviated as SI. SI is a decimal system, so all relationships between SI units are based on powers of 10. For example, scientists measure the dimensions of objects using the SI unit for length, which is the meter. One meter (1 m), which is about 3.28 ft (a little more than a yard), equals 100 centimeters (cm), or 1,000 millimeters (mm). A meter also equals 0.001 kilometer (km). Note that the units have a prefix that indicates the relationship of that unit to the base unit. For example, a micrometer is a unit of linear measurement equal to one-millionth (0.000001) of a meter, or one-thousandth of a millimeter.

SKILL: READING EFFECTIVELYRead each question, and write your answer in the space provided.1. How are the metric system and SI related?

________________________________________________________________________________________________________________________________

2. Why are all relationships between SI units based on powers of 10?________________________________________________________________________________________________________________________________

3. Which SI unit is used to measure the length of objects? ________________________________________________________________

4. Based on the passage, what do you infer a base unit is?________________________________________________________________________________________________________________________________

5. Why do many SI units contain a prefix?________________________________________________________________________________________________________________________________

Active Reading continued

SKILL: ORGANIZING INFORMATIONUse information contained in the passage to complete the table.

Unit Prefix 1 meter equals

kilometer (km) 6. 7.

centimeter (cm) 8. 9.

millimeter (mm) 10. 11.

micrometer (µm) 12. 13.

In the space provided, write the letter of the term or phrase that best completes the statement.

______14. A person who is 2 m tall is

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Holt Biology 18 Biology and You

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a. a little more than 3 ft tall.b. less than 5 ft tall.c. exactly 6 ft tall.d. a little more than 6 ft tall.

Skills Worksheet

1.4 Active Reading

Section: What Is Biology?Read the passage below. Then answer the questions that follow.

All organisms show the seven properties of living things at one or more stages of their lives. The seven properties of living things are cellular organization, homeostasis, metabolism, responsiveness, reproduction, heredity, and growth. Nonliving things sometimes seem to show some of these properties. For example, some chemical substances change color when exposed to heat or light. They seem to be responsive. But these substances do not show all seven properties of living things. The seven properties give a clear method for determining what is living and what is nonliving.

Living things can reproduce. Reproduction is the process living organisms use to produce offspring. All living things are able to pass on their characteristics to their offspring. The process of passing of traits from parents to offspring is called heredity. Children tend to resemble their parents because of heredity.

SKILL: READING EFFECTIVELYRead each question, and write your answer in the space provided.1. List the seven properties of living things.

________________________________________________________________________________________________________________________________________________________________________________________________

2. Does every living thing always show each one of these properties? Explain your answer.________________________________________________________________________________________________________________________________________________________________________________________________

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Biology 19 Biology and You

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Active Reading continued

3. Do nonliving things ever show properties of living things? Explain your answer.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

4. What is reproduction?________________________________________________________________________________________________________________________________

5. What is heredity?________________________________________________________________________________________________________________________________

6. How are reproduction and heredity similar? How are they different?________________________________________________________________________________________________________________________________

In the space provided, write the letter of the term or phrase that best answers the question.

______ 7. Which of these is an example of reproduction?a. A bacterium splits into two bacteria.b. A cell in your cheek makes a copy of the genetic information in its

nucleus.c. The bud on a tree branch swells in the spring.d. A salamander has its tail cut off and grows a new tail.

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Biology 20 Biology and You