Bluebook SAT Test Central Ideas and Details

Question 1

Read the following passage: 'The monarch butterfly's annual migration spans thousands of miles, from Canada to central Mexico. Scientists have long marveled at how these insects navigate with such precision despite having brains the size of a pinhead. Recent research suggests they use a time-compensated sun compass, integrating light cues with their internal circadian clock.' What is the central idea of this passage?

Accepted Answer

Monarch butterflies possess a remarkable navigation system that scientists are still studying

Answer

The passage focuses on the surprising navigational ability of monarch butterflies and ongoing scientific investigation, not merely the migration route or a single finding.

Question 2

Read the following passage: 'Urban heat islands occur when cities replace natural land cover with dense concentrations of pavement, buildings, and other surfaces that absorb and retain heat. This effect can raise urban temperatures by 1–7°F compared to surrounding rural areas. The consequences include increased energy consumption, elevated emissions, and compromised human health and comfort.' Which statement best summarizes the author's central claim?

Accepted Answer

Urban heat islands are caused by natural land being replaced by heat-retaining surfaces, with significant negative consequences

Answer

The passage defines urban heat islands, explains their cause (replacing natural land), and lists multiple consequences — all captured in choice B.

Question 3

A passage states: 'The printing press, invented by Johannes Gutenberg around 1440, democratized knowledge by making books affordable and widely available. Before this invention, manuscripts were hand-copied by monks, limiting literacy to the elite. Within decades of the press's introduction, book production soared and literacy rates began climbing across Europe.' What detail best supports the central idea that the printing press expanded access to knowledge?

Accepted Answer

Book production soared and literacy rates climbed after the press was introduced

Answer

The rise in book production and literacy rates directly supports the claim that knowledge became more accessible after the printing press.

Question 4

Read this passage: 'Coral reefs cover less than one percent of the ocean floor but support approximately 25 percent of all marine species. They provide food and livelihoods for hundreds of millions of people and protect coastlines from storm damage. Despite their importance, reefs are threatened by warming oceans, ocean acidification, and pollution.' What is the main idea?

Accepted Answer

Coral reefs are extraordinarily valuable ecosystems that face serious threats

Answer

The passage establishes both the enormous value of coral reefs and the threats they face — choice B captures both aspects.

Question 5

A student reads: 'Sleep deprivation impairs cognitive function in ways that mirror alcohol intoxication. After 17–19 hours without sleep, performance on tests resembles that of someone with a blood alcohol level of 0.05%. After 24 hours awake, impairment equals a blood alcohol level of 0.10%, which is above the legal driving limit in most countries.' What supporting detail reinforces the central claim that sleep deprivation seriously impairs cognition?

Accepted Answer

After 24 hours awake, impairment equals illegal intoxication levels

Answer

The comparison to exceeding legal blood alcohol limits is a concrete detail that reinforces how severely sleep loss impairs cognitive function.

Bluebook SAT Practice Test Practice Test

Bluebook SAT Practice Test Practice Test

Bluebook SAT Test Central Ideas and Details