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NEET BIOLOGYReproductive HealthHard

Question

The drug RU-486 is taken after sexual intercourse. It blocks implantation, and in this sense it prevents pregnancy:

A

like spermicidal foam

B

in a manner similar to tubal ligation

C

like the familiar birth control pill used for the last 30 years

D

by blocking progesterone receptors in the uterus, thus preventing progesterone from maintaining pregnancy

Step-by-Step Solution

progesterone is essential for maintaining the endometrium required for implantation and pregnancy . RU-486 (Mifepristone) functions as an antiprogestin; it blocks progesterone receptors, thereby making the uterus unsuitable for implantation and maintaining pregnancy. While the specific drug name is not in the standard NCERT text, the physiological principle of progesterone's role in implantation is covered.

Exam Context & Concepts Covered

This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Reproductive Health. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

BIOLOGYReproductive Healthsexualintercourseblocksimplantationprevents

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What is the full form of IUDs?

A.Inter Uterine Devices
B.Intra Uterine Diseases
C.Intra Uterine Devices
D.Inter Uterine Diseases
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In the assisted reproductive technology where gametes have been fertilized in vitro, which of the following is practicable for embryo transplantation in fallopian tube?

A.Only embryo (up to 8 blastomeres if zygote is not transplanted)
B.Only zygote is transplanted, not embryo
C.Either embryo or zygote with up to 8 blastomere phase transplanted
D.Morulla with 8-24 celled stage is transplanted in fallopian tube
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MTP was legalised in India in:

A.1971
B.1951
C.1981
D.1923
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Match the contraceptive method 'Pill' with its primary mode of action: I. Pill

A.Prevents implantation
B.Prevents ovulation
C.Prevents sperms from reaching cervix
D.Semen contains no sperms
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MTP is:

A.Medical Termination of Pregnancy
B.Also called induced abortion
C.Both (1) and (2)
D.-2
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Which of the following cannot be detected in a developing foetus by amniocentesis?

A.Klinefelter's syndrome
B.Sex of the foetus
C.Down's syndrome
D.Jaundice
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Natural methods for contraception work on the principle of:

A.Preventing fertilization
B.Preventing implantation
C.Preventing ovulation
D.Preventing embryo development
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Which of the sets of diseases are completely curable if detected early?

A.Hepatitis - B, Gonorrhoea, Syphilis
B.Genital herpes, Chlamydiasis, Syphilis
C.HIV Infections, Chlamydiasis, Gonorrhoea
D.Chlamydiasis, Syphilis, Gonorrhoea
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