Main Idea and Summarizing — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Coral reefs are home to thousands of fish species. They protect coastlines from storms and provide food for millions of people. What is the main idea?
A) Fish live in the ocean.
B) Coral reefs are valuable ecosystems.
C) Storms damage coastlines.
D) People enjoy eating seafood.
Both details (supporting fish species and protecting coastlines) support the umbrella idea that coral reefs are valuable ecosystems.
2. Which detail would NOT belong in a summary of a passage about the invention of the telephone?
A) Alexander Graham Bell invented the telephone.
B) The telephone changed how people communicate.
C) Bell enjoyed eating oatmeal for breakfast.
D) The first phone call was made in 1876.
Bell's breakfast preference is a trivial personal detail unrelated to the invention and its significance.
3. A paragraph says: "Bats use echolocation to find food in the dark. They send out sound waves that bounce off insects and return to their ears." What is the main idea?
A) Bats eat insects at night.
B) Sound waves travel through air.
C) Bats use echolocation to locate their prey.
D) Insects try to hide from bats.
Both sentences describe how echolocation works as a food-finding strategy — the main idea combines them.
4. Which is the best one-sentence summary of a passage about how recycling saves energy?
A) Recycling is nice.
B) People should recycle paper, plastic, and glass to use less energy and reduce waste.
C) Factories use machines that need electricity.
D) Glass bottles can be melted and reused.
This summary names specific materials, states the action, and explains the benefit — it is specific and complete.
Part B: Fill in the Blank
Write the correct answer on each line.
1. The main idea of a passage is the central message the author communicates.
The main idea is the central message or most important point the author wants readers to take away.
2. A detail about the color of a character's shirt is usually a minor detail, not a key one.
Clothing color is a descriptive detail that typically doesn't affect the main idea or story outcome.
3. When summarizing, you should keep the same order of events as the original text.
Maintaining chronological or logical order in a summary preserves the original structure and meaning.
4. A topic sentence often states the main idea at the beginning of a paragraph.
The topic sentence, which typically appears at the beginning, states the main idea directly.
5. An effective summary answers the question: What is this passage mainly about?
A summary answers "What is this mainly about?" by capturing the central focus in concise language.