Digital SAT: Main Idea 2

1. In the nineteenth century, many naturalists classified insects largely by comparing visible features such as wing shape, body color, and antenna length. Later scientists began studying insect behavior more closely, including how different species communicated, selected food sources, and cared for their young. This shift revealed that insects that looked similar could have very different habits, while insects that looked different sometimes played similar roles in their environments.

Which choice best states the main idea of the text?

1.A) Nineteenth-century naturalists were unable to classify insects accurately because they lacked modern laboratory equipment.

2.B) Scientists eventually discovered that insects with similar body colors usually communicate in the same way.

3.C) Studying insect behavior helped scientists develop a more complete understanding of insect differences and ecological roles.

4.D) Insect classification is now based entirely on behavior rather than physical appearance.

Question 1 of 10

2. For many years, historians of navigation emphasized the role of improved instruments, such as more accurate clocks and better compasses, in making long ocean voyages safer. More recently, however, some scholars have focused on sailors’ handwritten logs, which often recorded wind patterns, currents, and weather conditions from repeated journeys. These records show that practical experience, shared across voyages, also played an important role in helping crews travel more predictably across long distances.

Which choice best describes the overall structure of the text?

1.A) It explains how several navigation tools were invented and then compares their accuracy in different ocean regions.

2.B) It argues that sailors’ logs were more reliable than clocks and compasses because instruments frequently failed.

3.C) It describes a problem faced by sailors, presents several unsuccessful attempts to solve it, and then identifies a successful solution.

4.D) It presents one traditional explanation for safer ocean travel, introduces a newer focus of historical research, and explains what that newer focus reveals.

Question 2 of 10

3. In the early twentieth century, many botanists studying forests focused on mature trees, treating seedlings and saplings mainly as future replacements for older growth. Later ecologists began examining young plants more closely and found that their survival often depended on subtle factors such as soil moisture, shade patterns, and competition from nearby roots. This research showed that the future composition of a forest could be shaped long before its largest trees began to decline.

Which choice best states the main idea of the text?

1.A) Botanists once believed that mature trees had little effect on the survival of seedlings and saplings.

2.B) Research on young plants has helped ecologists better understand how forests change over time.

3.C) Seedlings and saplings usually grow best in forests where older trees have already disappeared.

4.D) Soil moisture is more important than shade or root competition in determining which trees survive.

Question 3 of 10

4. For many years, historians studying ancient cities relied heavily on monumental buildings, such as temples, palaces, and defensive walls, to understand urban life. More recently, archaeologists have turned greater attention to ordinary houses, workshops, and storage areas. These less imposing structures can reveal how people cooked, worked, traded, and organized daily routines. By studying them, researchers have developed a fuller picture of ancient cities, one that includes not only rulers and ceremonies but also the activities of everyday residents.

Which choice best describes the overall structure of the text?

1.A) It identifies a traditional focus of historical research, introduces a broader source of evidence, and explains how that source has expanded scholars’ understanding.

2.B) It compares several ancient cities and argues that those with larger monuments were more politically powerful.

3.C) It explains why temples and palaces were difficult to excavate and then describes new tools used to study them.

4.D) It presents a debate about whether ancient cities had organized trade and concludes that the question remains unresolved.

Question 4 of 10

5. In the late nineteenth century, many engineers viewed elevators mainly as practical devices that allowed people to move more easily between floors. As taller office buildings became common, however, architects began to see elevators as shaping the design of buildings themselves. Because elevators made upper floors more accessible and desirable, building layouts changed: offices no longer needed to be concentrated near stairways, and height became a more valuable feature of urban construction.

Which choice best states the main idea of the text?

1.A) Elevators were originally developed because architects wanted to make upper floors more expensive than lower floors.

2.B) The rise of taller office buildings caused engineers to abandon earlier concerns about elevator safety.

3.C) Elevators influenced urban architecture by making taller buildings more practical and changing how interior space was organized.

4.D) Architects in the nineteenth century believed stairways should be removed from most office buildings.

Question 5 of 10

6. For many years, scholars studying early photography emphasized the technical challenges photographers faced, such as long exposure times and fragile equipment. More recently, historians have examined how photographers chose their subjects, arranged scenes, and circulated images in newspapers and exhibitions. This newer focus has shown that early photographs were not merely mechanical records of reality but carefully shaped works that influenced how viewers understood people, places, and events.

Which choice best describes the overall structure of the text?

1.A) It compares early photography with painting and argues that painting had a stronger influence on public opinion.

2.B) It presents an older scholarly focus, introduces a newer line of inquiry, and explains how that newer focus changed historians’ understanding.

3.C) It describes several technical problems in early photography and explains how inventors eventually solved them.

4.D) It argues that newspapers were more important than exhibitions in making early photographs widely available.

Question 6 of 10

7. For many years, historians of food focused mainly on cookbooks written for wealthy households, since these texts were often well preserved and carefully organized. More recently, researchers have studied market records, household inventories, and handwritten recipe notes to learn about the meals prepared by ordinary families. This broader evidence has shown that everyday cooking was often more varied and adaptive than published cookbooks alone would suggest.

Which choice best states the main idea of the text?

1.A) Published cookbooks were usually written by ordinary families rather than by cooks working in wealthy households.

2.B) Historians have found that handwritten recipe notes are less reliable than published cookbooks for studying food history.

3.C) Wealthy households generally prepared simpler meals than ordinary families did.

4.D) By examining sources beyond elite cookbooks, historians have gained a fuller understanding of everyday cooking practices.

Question 7 of 10

8. In the early study of glaciers, scientists often concentrated on how ice carved valleys and transported rocks across long distances. Later researchers began examining the sediments left behind after glaciers retreated, including layers of sand, gravel, and clay. These deposits helped scientists reconstruct past climates by revealing when glaciers advanced, how quickly they melted, and what conditions existed in the surrounding landscape. As a result, glacial remains came to be understood not only as evidence of geological movement but also as records of environmental change.

Which choice best states the main idea of the text?

1.A) The study of glacial deposits has helped scientists use glaciers’ remains to understand past environmental conditions.

2.B) Scientists now believe that glaciers mainly affect landscapes by transporting rocks across long distances.

3.C) Layers of sand, gravel, and clay are useful because they show that glaciers always melt at the same rate.

4.D) Early glacier research was inaccurate because scientists ignored the role of valleys in shaping climate.

Question 8 of 10

9. For many years, historians studying clothing in ancient societies focused mainly on garments preserved in tombs or depicted in art. These sources often emphasized formal or ceremonial dress, especially clothing worn by elites. More recently, researchers have examined tools such as spindle whorls, loom weights, and dye residues to better understand how textiles were produced and used in everyday life. This evidence has helped scholars see clothing not only as a marker of status but also as the result of daily labor, local resources, and practical needs.

Which choice best states the main idea of the text?

1.A) Ancient clothing was primarily ceremonial because most preserved garments have been found in tombs.

2.B) Researchers have learned that elite clothing was usually made with different tools than everyday clothing.

3.C) Studying textile tools and materials has broadened historians’ understanding of clothing in ancient societies.

4.D) Ancient artists often exaggerated the importance of clothing in order to emphasize social status.

Question 9 of 10

10. For many years, researchers studying ancient agriculture relied heavily on written records, such as tax documents and land surveys, to understand which crops were grown. However, these records often emphasized crops that were economically important to governments rather than everything farmers actually cultivated. More recently, archaeologists have analyzed charred seeds, pollen, and plant residues found at settlement sites. This evidence has revealed that ancient farming was often more diverse than official records alone suggest.

Which choice best describes the overall structure of the text?

1.A) It explains why ancient governments collected agricultural taxes and then describes how farmers avoided paying them.

2.B) It compares two ancient farming regions and argues that one produced a wider variety of crops than the other.

3.C) It identifies a limitation of one type of historical evidence, introduces another type of evidence, and explains what the newer evidence has shown.

4.D) It presents a debate about whether written records or plant remains are easier for researchers to interpret.

Question 10 of 10