Reading Comprehension

PT156 · S3 · P4 · Q24 Koskan's Oyster Discovery

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Organic chemist Larry Koskan's inspiration arrived in the mid-1980s, when he read a report by marine biologists describing how oyster shells grow.

Topic

How a biodegradable chemical inspired by oysters (polyaspartate) offered a greener alternative to common industrial chemicals, but faced challenges in adoption.

Framework

Old / New

Main Point

Koskan discovered that polyaspartate, a biodegradable compound inspired by oysters, could replace persistent, polluting polyacrylates, but adoption is limited by higher costs—even as specialty uses prove its value. *(The main point is captured most fully in the final paragraph, especially in the sentences: )*

P1: Origin of Inspiration

Koskan got the idea for a new biodegradable chemical after reading how oysters use a unique protein to shape their shells.

P2: Connecting the Dots—Oyster Proteins vs. Industrial Chemicals

Koskan, already studying polyacrylates (common industrial chemicals), realized the oyster compound (polyaspartate) could perform similar functions (preventing mineral buildup) but, being biodegradable, would be safer for the environment.

P3: Problems with the Old Way—Polyacrylates Everywhere, and They Don’t Break Down

Polyacrylates are everywhere (detergents, diapers, etc.), cheap, and effective, but they’re not biodegradable, so they end up accumulating in landfills.

24.

Which one of the following most accurately captures the meaning of the phrase "on its own merits" as it is used in the third-to-last sentence of the passage?

  1. without funding from government agencies

    Trap

    9% picked this

  2. without reference to its chemical

    Trap

    3% picked this

  3. once its newest industrial uses

    Trap

    6% picked this

  4. Correct

    not merely as a general

    Why this is right

    Answer D is correct.

    Skill tested: Meaning in Context · how this choice captures the passage's function is the move to repeat next time.

    67% picked this

  5. because of its unsurpassed ability

    Trap

    16% picked this

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