(A) In the digestive system of an earthworm $(Pheretima)$: $1$. $P$ points to the gizzard,which is a muscular organ located in the $8^{th}-9^{th}$ seg

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Gizzard $\quad\quad$ Intestinal caeca

(A) In the digestive system of an earthworm $(Pheretima)$: $1$. $P$ points to the gizzard,which is a muscular organ located in the $8^{th}-9^{th}$ segments,responsible for grinding food particles. $2$. $Q$ points to the intestinal caeca,which are paired,conical,glandular structures arising from the intestine in the $26^{th}$ segment. Therefore,$P$ is the gizzard and $Q$ is the intestinal caeca.

Class 11 Biology Structural Organisation In Animals Anatomy of Earthworm

Easy

The figure below shows the digestive system of an earthworm. What are $P$ and $Q$?

A
Gizzard $\quad\quad$ Intestinal caeca
B
Intestinal caeca $\quad\quad$ Gizzard
C
Gizzard $\quad\quad$ Typhlosole
D
Typhlosole $\quad\quad$ Gizzard

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Class 11

Biology Questions

Chapter

Structural Organisation In Animals

Subtopic

Anatomy of Earthworm

Study the following in $Pheretima$.
$I.$ Dorso-intestinal blood vessels
$II.$ External intestinal plexus
$III.$ Internal intestinal plexus
$IV.$ Ventro-intestinal blood vessel
Arrange the blood vessels in the correct sequence of blood flow from the ventral blood vessel to the dorsal blood vessel.
The correct sequence is:

Medium

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Match the following and select the correct option:

Column-$I$ Column-$II$

$P$. Testes $I$. $18^{th}$ segment

$Q$. Accessory glands $II$. $17^{th}$ and $19^{th}$ segments

$R$. Male genital pore $III$. $6^{th}$ to $9^{th}$ segments

$S$. Spermathecae $IV$. $13^{th}$ segment

$T$. Ovaries $V$. $10^{th}$ and $11^{th}$ segments

Column-$I$	Column-$II$
$P$. Testes	$I$. $18^{th}$ segment
$Q$. Accessory glands	$II$. $17^{th}$ and $19^{th}$ segments
$R$. Male genital pore	$III$. $6^{th}$ to $9^{th}$ segments
$S$. Spermathecae	$IV$. $13^{th}$ segment
$T$. Ovaries	$V$. $10^{th}$ and $11^{th}$ segments