Digital PSAT Reading and Writing Practice Question 240: Answer and Explanation

Question: 240

Parthenogenesis is not limited to lizards and sharks but is common in insects, crayfish, flatworms, snails, snakes, and even some birds. The exception is mammals. Although parthenogenesis can be artificially induced in a science laboratory, it has never been known to have occurred in mammals naturally.

Which choice best states the function of the underlined sentence in the text as a whole?

  • A. To transition to a clarification
  • B. To define an unfamiliar term
  • C. To give ethical reasoning
  • D. To analyze an economic impact

Correct Answer: A

Explanation:

A. The first part of the text makes a broad statement of parthenogenesis. The underlined sentence outlines an important exception to this, mammals, and transitions into a clarification about how parthenogenesis does not occur naturally in mammals. It is not B, because this short sentence does not give a definition. It is not C or D, because the focus is on science, not ethics and economics.

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