Craft and StructureEasyPurpose of a short science text
Craft and Structure practice question
An octopus can change color in under a second. Its skin holds thousands of tiny sacs of pigment, each ringed by muscles; when the muscles squeeze, the sac spreads wide and shows its color, and when they relax, the color shrinks to an invisible dot.
Which choice best describes the main purpose of the text?
- A. To explain how an octopus changes the look of its skinCorrect
- B. To argue that octopuses make poor aquarium animals
- C. To compare octopuses with squid
- D. To describe where octopuses live
Answer: A. To explain how an octopus changes the look of its skin
The text walks through the mechanism — pigment sacs opening and closing — so its purpose is to explain how the color change works.
Why the other answers are wrong
- B. To argue that octopuses make poor aquarium animals
- Aquariums are never mentioned.
- C. To compare octopuses with squid
- Squid are never mentioned in the text.
- D. To describe where octopuses live
- Habitat is never discussed; the text is about skin.
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