(B) The phenomenon of embryonic induction,specifically the theory of the organizer (inductor) in amphibia,was first described by Hans Spemann in $1938

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(B) The phenomenon of embryonic induction,specifically the theory of the organizer (inductor) in amphibia,was first described by Hans Spemann in $1938$.He was awarded the Nobel Prize in Physiology or Medicine in $1935$ for his discovery of the organizer effect in embryonic development.

Class 12 Biology Human Reproduction Pregnancy and Embryonic development

Easy

$A$ phenomenon of embryonic induction was first described in amphibia by

A
Aristotle
B
Spemann
C
Von Baer
D
Spallanzani

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Class 12

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Chapter

Human Reproduction

Subtopic

Pregnancy and Embryonic development

In humans,the foetal membrane which forms the intimate connection with the uterine tissue is:

Medium

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Match the following:

Column-$I$ Column-$II$

$A$. $1^{st}$ month $i$. First movement of foetus

$B$. $2^{nd}$ month $ii$. Major organ system

$C$. $3^{rd}$ month $iii$. Foetal heart

$D$. $5^{th}$ month $iv$. Limbs $\&$ digits

Column-$I$	Column-$II$
$A$. $1^{st}$ month	$i$. First movement of foetus
$B$. $2^{nd}$ month	$ii$. Major organ system
$C$. $3^{rd}$ month	$iii$. Foetal heart
$D$. $5^{th}$ month	$iv$. Limbs $\&$ digits