(B) In the provided diagram of a developing human fetus within the uterus,the label $X$ points to the finger-like projections that extend from the cho

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(B) In the provided diagram of a developing human fetus within the uterus,the label $X$ points to the finger-like projections that extend from the chorion into the uterine tissue. These structures are known as placental villi. They are essential for the exchange of nutrients,gases,and waste products between the maternal blood and the fetal circulation. Therefore,the correct identification for $X$ is placental villi.

Class 12 Biology Human Reproduction Pregnancy and Embryonic development

Medium

Identify $X$ from the figure:

A
Cavity of uterus
B
Placental villi
C
Yolk sac
D
Umbilical cord with its vessels

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Class 12 Questions

Class 12

Biology Questions

Chapter

Human Reproduction

Subtopic

Pregnancy and Embryonic development

The number of foetal membranes in humans is

Easy

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During pregnancy,which of the following is secreted through the urine of the mother?

MediumAIEEE 2003

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Identify the structure shown in the process of human embryonic development.

Easy

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Match List-$I$ with List-$II$ related to embryonic development at various months of pregnancy:
List-$I$ List-$II$
$A$. The foetus movement starts and hair appears on the head $I$. $24$ weeks of pregnancy
$B$. The foetus develops limbs and digits $II$. $20$ weeks of pregnancy
$C$. The foetus develops external genital organs $III$. $8$ weeks of pregnancy
$D$. The foetus body is covered with fine hair; eyelids separate and eyelashes are formed $IV$. $12$ weeks of pregnancy
Choose the correct answer from the options given below:

List-$I$	List-$II$
$A$. The foetus movement starts and hair appears on the head	$I$. $24$ weeks of pregnancy
$B$. The foetus develops limbs and digits	$II$. $20$ weeks of pregnancy
$C$. The foetus develops external genital organs	$III$. $8$ weeks of pregnancy
$D$. The foetus body is covered with fine hair; eyelids separate and eyelashes are formed	$IV$. $12$ weeks of pregnancy

MediumNEET 2026

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