SAT Subject Biology Practice Question 396: Answer and Explanation

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Question: 396

6. Which of the following could be reasons for infertility in a woman who is ovulating normally?

I. Blocked uterine tube

II. Large amounts of FSH released just prior to ovulation

III. Large amounts of LH released just prior to ovulation

A. I only
B. II only
C. I and II only
D. II and III only
E. I, II, and III

Correct Answer: A

Explanation:

A Infertility can be caused by anything that prevents the meeting of sperm and egg, including things that prevent sperm or egg survival. Remember also that this is a I, II, III style question-eliminate answer choices as you work through the options. Option I is true. The egg must travel through the uterine tube toward the uterus, and the sperm must travel through the uterine tube toward the egg. If the tube is blocked, travel cannot occur and the sperm and egg would not meet. (You can now eliminate choices B and D.) Options II and III are false. Large amounts of FSH and LH are normally released prior to ovulation; the LH surge is, in fact, what triggers ovulation. These could not be reasons for infertility. (Eliminate choices C and E.)

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