Main Idea Quiz
Questions: 16 · 10 minutes
1. A draft paragraph originally focuses on the health benefits of walking. The writer then adds several sentences about how walking instead of driving can reduce fuel use and emissions. Which revised main idea best includes both parts?
Walking is the fastest way to travel through every community.
Choosing to walk can benefit personal health and the environment.
People should walk only when they are unable to drive.
Fuel use is the main cause of all personal health problems.
2. Which sentence is most likely a supporting detail for the main idea “Regular reading can expand a student’s vocabulary”?
Encountering unfamiliar words in context can help readers learn their meanings.
Reading has been part of human culture for centuries.
Vocabulary consists of the words a person knows and uses.
Some students prefer mysteries, while others choose biographies.
3. Read the passage: “The school cafeteria replaced disposable trays with washable ones. It also added clearly labeled recycling bins. By spring, the amount of cafeteria trash had dropped substantially.” Which implied main idea is best supported?
Spring is the most effective season for recycling.
Washable trays were cheaper than every disposable option.
Students preferred recycling bins to eating lunch.
Changes in cafeteria practices reduced the school’s waste.
4. A three-paragraph passage first explains why plastic waste reaches oceans, then describes its effects on wildlife, and finally presents ways communities can reduce it. Which main idea best covers the whole passage?
Ocean animals sometimes mistake plastic pieces for food.
Communities can organize cleanups on local beaches.
Plastic is one of many materials found in modern communities.
Ocean plastic has identifiable causes and effects that communities can help address.
5. How does a passage’s topic differ from its main idea?
The topic names the subject, while the main idea states the key point about it.
The topic gives evidence, while the main idea lists every supporting detail.
The topic appears only in the title, while the main idea appears only at the end.
The topic is always a complete sentence, while the main idea is one word.
6. A passage says that sleep helps the brain organize new information, improves attention, and supports memory. Which summary best captures the main idea?
Attention is more useful for learning than memory is.
The brain organizes information only while a person is asleep.
Adequate sleep supports several mental processes involved in learning.
Researchers study what happens to the brain at night.
7. A paragraph explains how a neighborhood garden supplies vegetables, gives residents a place to meet, and teaches children about plants. Which proposed main idea is too narrow?
Community projects can improve life in a neighborhood.
A neighborhood garden can offer food, social, and educational benefits.
The garden serves residents in several different ways.
Children learn how tomato plants grow in the neighborhood garden.
8. Read the notice: “Beginning Monday, the library will remain open until 8 p.m. on weekdays. The added hours will give students more time to use computers, receive research help, and study after activities.” What is the main idea?
All students must study in the library after activities.
Longer library hours will provide students with more access to its resources.
Research help is available only on Monday evenings.
The library’s computers will be replaced during the week.
9. A writer states a main idea and then gives statistics, examples, and expert observations. What do those additional elements primarily do?
Introduce unrelated topics for the reader to investigate
Replace the need for a central point
Support and develop the passage’s central point
Prove that every statement in the passage is a main idea
10. A paragraph notes that a bicycle lane separates riders from cars, gives cyclists a predictable route, and can make intersections easier to navigate. Which statement is supported by all three details?
Bicycle lanes eliminate every danger faced by cyclists.
Well-designed bicycle lanes can make cycling more orderly and manageable.
Intersections are the only places where cyclists need guidance.
Cars should never travel on streets that include bicycle lanes.
11. Read the passage: “Rain gardens are shallow planted areas that collect water from roofs and pavement. The soil and plants slow the water down, allowing more of it to soak into the ground. This can reduce runoff entering storm drains.” What is the main idea?
Roofs and pavement should be removed from rainy regions.
Rain gardens manage runoff by capturing and absorbing water.
All shallow gardens collect the same amount of rainfall.
Storm drains provide water for garden plants.
12. Read the passage: “Mina began setting out her clothes before bed. She also packed her school bag and prepared breakfast ingredients. Within a week, she was arriving at school on time and feeling less rushed.” What is the main idea?
Preparing the night before improved Mina’s morning routine.
Students who arrive late should pack lighter school bags.
Mina prefers preparing breakfast in the evening.
Mina needed exactly one week to learn how to organize.
13. Read the passage: “Each autumn, monarch butterflies travel south as temperatures fall and flowering plants become scarce. In spring, later generations move north as warmer conditions return.” Which implied main idea is best supported?
Seasonal conditions influence monarch butterfly migration.
Individual monarch butterflies complete every stage of the round trip.
Monarch butterflies migrate because they cannot eat flowering plants.
Spring temperatures are identical throughout the monarchs’ range.
14. A paragraph explains that bees pollinate crops, help wild plants reproduce, and support food webs. Which option is a supporting detail rather than the main idea?
Bees play several important roles in ecosystems and agriculture.
Bees contribute to both plant reproduction and wider food systems.
Healthy environments benefit from the work performed by bees.
Many crops depend on bees for pollination.
15. Which statement best defines the main idea of a passage?
The most surprising fact included by the author
The general subject named in one or two words
The central point that the passage develops or communicates
The final sentence, regardless of its role
16. A passage describes how trees shade city streets, absorb rainwater, and provide habitats for birds. Which title best expresses its main idea?
Bird Species Found in Large Forests
How Rain Falls on City Streets
How Trees Benefit Urban Communities
The Different Shapes of Tree Leaves