Ascaris and Cockroach resemble each other in

Among the following animals, which one produces the smallest egg?

State the location and function of the following:
$(i)$ Nephridia
$(ii)$ Mantle cavity

How many of the following characteristics are common to both Amphibians and Reptiles?
$a$ - Type of fertilization
$b$ - Cold-blooded (Poikilothermic)
$c$ - Development
$d$ - Oviparous
$e$ - Coelomate
$f$ - Bilateral symmetry

The infective stage of $Trypanosoma$ $gambiense$ is:

Match the following columns and select the correct option:

$(a)$ $6-15$ pairs of gill slits	$(i)$ $Trygon$
$(b)$ Heterocercal caudal fin	$(ii)$ $Petromyzon$
$(c)$ Air bladder	$(iii)$ $Chondrichthyes$
$(d)$ Poison sting	$(iv)$ $Osteichthyes$

$(a)\quad (b)\quad (c)\quad (d)$