The difference between male and female $Anopheles$ occurs in:

Match the animals listed under Column-$I$ with their respective zoological names given under Column-$II$; choose the answer that provides the correct combination of the alphabets of the two columns.
Column-$I$ (Common Name) | Column-$II$ (Zoological Name)
$A$. Starfish | $p$. Sepia
$B$. Jellyfish | $q$. Astropecten
$C$. Devilfish | $r$. Aurelia
$D$. Cuttlefish | $s$. Octopus

Which of the following statements are true or false?
$(i)$ Suckers are found in liver fluke.
$(ii)$ In Arthropods,fertilization is external.
$(iii)$ Chordata is divided into $4$ subphyla.
$(iv)$ Water vascular system is present in Hemichordata.

Make the correct pair:

$1. \text{ Osculum}$	$p. \text{ Fasciola}$
$2. \text{ Hypostome}$	$q. \text{ Ctenoplana}$
$3. \text{ Comb jellies}$	$r. \text{ Spongilla}$
$4. \text{ Hook and sucker}$	$s. \text{ Meandrina}$

Which of the following animals does not belong to the phylum $Mollusca$?

What is common between the trichocysts of $Paramecium$ and the nematocysts of $Hydra$?