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Question #45467
The Question
Which of the following statements regarding the physiological mechanisms of Intra Uterine Devices (IUDs) is INCORRECT?
Options
- A.
Cu-T and Multiload 375 release copper ions that suppress sperm motility and their fertilizing capacity.
- B.
All IUDs generally increase the phagocytosis of sperms within the uterus due to a localized foreign-body inflammatory response.
- C.
Hormone-releasing IUDs like LNG-20 act exclusively by exerting negative feedback on the hypothalamus to inhibit ovulation, lacking any localized phagocytic effect.
- D.
Progestasert makes the uterus unsuitable for implantation and renders the cervix hostile to sperms by altering cervical mucus.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Progesterone|Estrogen|IUD|Phagocytosis|Endometrium
Why This Question Is Tricky
Common Mistakes
The Conceptual Pivot lies in the NCERT phrase 'in addition'.
Students often compartmentalize Copper IUDs as 'phagocytic/spermicidal' and Hormonal IUDs as 'ovulation inhibitors'.
However, all IUDs cause a foreign-body reaction leading to sperm phagocytosis.
Furthermore, the primary contraceptive action of hormonal IUDs is local (cervical mucus thickening and endometrial alteration), not exclusively systemic HPG axis suppression.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Chemical Coordination and Integration - Class 11 |
| Concept | Progesterone/Estrogen Feedback |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |