Question

Which ion is known to suppress sperm motility?

• A. Copper
• B. Magnesium
• C. Mercury
• D. Calcium

Hint:

Copper-T and other copper-releasing IUDs work by increasing phagocytosis of sperms and suppressing sperm motility and fertilizing capacity.

Answer 1

The Correct Option is A

Concept: Certain contraceptive devices utilize the action of metallic ions to prevent fertilization. Copper-releasing intrauterine devices (IUDs) are widely used because copper ions affect sperm physiology and reduce the probability of fertilization. Copper ions interfere with sperm movement and viability within the female reproductive tract.

Step 1: Understand the action of copper ions. Copper-releasing IUDs such as Copper-T release copper ions continuously into the uterine cavity. These copper ions suppress sperm motility and decrease the fertilizing capacity of sperms.

Step 2: Analyze the options. Copper ions are specifically known for reducing sperm motility. Magnesium does not have this contraceptive role. Mercury is toxic but is not used for suppression of sperm motility in contraception. Calcium is important for several cellular functions and does not suppress sperm movement.

Step 3: Draw the conclusion. Therefore, the ion responsible for suppressing sperm motility is copper. \[ \boxed{\text{Copper}} \] Hence, the correct answer is \[ \boxed{(A)\ \text{Copper}} \]