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Which one of the following phyla is correctly matched with its two general characteristics?
A
Echinodermata - Pentamerous radial symmetry and mostly internal fertilization
B
Mollusca - Normally oviparous and development through a trochophore or veliger larva
C
Arthropoda - Body divided into head, thorax and abdomen and respiration by tracheae
D
Chordata - Notochord at some stage and separate anal and urinary openings to the outside
Detailed Solution
Mollusca: molluscs are usually dioecious and oviparous, with indirect development through a larval stage, the trochophore or the veliger larva. Both characters are correct as general features of the phylum.
Echinodermata: the adults do show pentamerous radial symmetry, but fertilisation is usually external, not internal.
Arthropoda: the body is divided into head, thorax and abdomen, but respiration by tracheae is not a general character; arthropods respire by gills, book gills, book lungs or the tracheal system in different groups.
Chordata: a notochord is present at some stage, but separate anal and urinary openings to the outside are not a general character; many chordates have a common opening, the cloaca.
So the phylum correctly matched with both its general characteristics is Mollusca.
Echinodermata: the adults do show pentamerous radial symmetry, but fertilisation is usually external, not internal.
Arthropoda: the body is divided into head, thorax and abdomen, but respiration by tracheae is not a general character; arthropods respire by gills, book gills, book lungs or the tracheal system in different groups.
Chordata: a notochord is present at some stage, but separate anal and urinary openings to the outside are not a general character; many chordates have a common opening, the cloaca.
So the phylum correctly matched with both its general characteristics is Mollusca.