What is the function of the retina, how to determine the most effective contraceptive, what is the acrosome, and why does vasectomy not prevent HIV transmission?

Here are the answers to your questions:

1.1.6 The retina contains the photoreceptors (rods and cones) that detect light.

• C

1.1.7 To determine the most effective contraceptive, one would look at the number of women who did not become pregnant.

• B

1.1.8 The acrosome is a cap-like organelle at the head of the sperm that contains enzymes to break down the outer layers of the ovum, allowing fertilization.

• A

1.1.9 A vasectomy prevents sperm from being ejaculated, but the seminal fluid produced by the accessory glands (which can carry HIV) is still ejaculated.

• B