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In which one of the following are the genus name, its two characters and its class/phylum correctly matched?
A
$Aurelia$ – (a) Cnidoblasts, (b) Organ level of organization – Coelenterata
B
$Ascaris$ – (a) Body segmented, (b) Males and females distinct – Annelida
C
$Salamandra$ – (a) A tympanum represents ear, (b) Fertilization is external – Amphibia
D
$Pteropus$ – (a) Skin possesses hair, (b) Oviparous – Mammalia
Detailed Solution
$Aurelia$ is a coelenterate with cnidoblasts, but coelenterates have a tissue level of organisation, not organ level, so this row is wrong.
$Ascaris$ has separate sexes, but its body is unsegmented and it belongs to Aschelminthes (Nematoda), not Annelida, so this row is wrong.
$Pteropus$ (flying fox) is a mammal with hair, but it is viviparous, not oviparous, so this row is wrong.
$Salamandra$ belongs to class Amphibia; in amphibians a tympanum represents the ear and fertilisation is described as external (NCERT general characters of Amphibia), so this row is taken as correct.
Hence the correctly matched genus is $Salamandra$.
$Ascaris$ has separate sexes, but its body is unsegmented and it belongs to Aschelminthes (Nematoda), not Annelida, so this row is wrong.
$Pteropus$ (flying fox) is a mammal with hair, but it is viviparous, not oviparous, so this row is wrong.
$Salamandra$ belongs to class Amphibia; in amphibians a tympanum represents the ear and fertilisation is described as external (NCERT general characters of Amphibia), so this row is taken as correct.
Hence the correctly matched genus is $Salamandra$.