Question

Copper-T prevents pregnancy mainly by

• A. Inhibiting ovulation
• B. Killing spermatozoa and reducing sperm motility
• C. Blocking implantation by destroying the zygote
• D. Preventing fertilization by hormone secretion

Hint:

Examples of IUDs: \[ \boxed{\text{Copper-T}} \] \[ \boxed{\text{Cu-7}} \] \[ \boxed{\text{Multiload-375}} \] Copper ions: \[ \boxed{\text{Decrease sperm motility and fertilizing capacity}} \] A very important NCERT fact for CUET Biology.

Answer 1

The Correct Option is B

Step 1: Recall what Copper-T is. Copper-T is an intrauterine contraceptive device (IUD) placed inside the uterus.

Step 2: Understand the role of copper ions. Copper ions released from the device:
• Increase phagocytosis of sperms
• Reduce sperm motility
• Reduce sperm fertilizing capacity

Step 3: Determine the correct mechanism. Thus Copper-T mainly prevents fertilization by adversely affecting sperm activity. \[ \boxed{\text{Kills spermatozoa and reduces sperm motility}} \] Hence, \[ \boxed{\text{(B)}} \] is the correct answer.