Teeth in frog are:

In frogs,mucus helps to keep the skin ..........

Acoustic spots in a frog are present in:

The sinus venosus of the frog is located on

Match each item in Column $I$ with one in Column $II$ and select the correct match from the codes given:

Column $I$	Column $II$
$A$. Vocal Sac	$P$. Sexual dimorphism
$B$. In hibernation, frog respires	$R$. Through skin
$C$. Renal portal system	$U$. Joins kidneys and lower parts of body
$D$. Bidder's canal	$X$. Receives sperm from vasa efferentia

Choose the correct sentences for a female frog.
$1$. Vocal sacs are absent in female frogs.
$2$. $A$ mature female can lay $2500$ to $3000$ ova at a time.
$3$. In female frogs,fertilized eggs are encased in oothecae and it is a dark reddish to blackish brown.