Q18 / 200 · NEET 2007 · Botany
Which one of the following is a matching pair of a body feature and the animal possessing it?
- AVentral heart-scorpion
- BPost-anal tail-octopus
- Correct answerCVentral central nervous system-leech
- DPharyngeal gill slits absent in embryo-Chameleon
Solution
Scorpions belong to the phylum Arthropoda, which are non-chordates. In non-chordates, the heart, if present, is located dorsally. Therefore, a ventral heart is an incorrect match.
Octopuses belong to the phylum Mollusca, which are also non-chordates. A post-anal tail is a characteristic feature of chordates, so it is absent in octopuses.
Leeches belong to the phylum Annelida, which are non-chordates. The central nervous system in non-chordates is typically ventral, solid, and double. Therefore, a ventral central nervous system in a leech is a correct match.
Chameleons belong to the class Reptilia, which falls under the phylum Chordata. All chordates possess pharyngeal gill slits at some stage in their embryonic development. Therefore, the statement that they are absent in a chameleon embryo is incorrect.
Octopuses belong to the phylum Mollusca, which are also non-chordates. A post-anal tail is a characteristic feature of chordates, so it is absent in octopuses.
Leeches belong to the phylum Annelida, which are non-chordates. The central nervous system in non-chordates is typically ventral, solid, and double. Therefore, a ventral central nervous system in a leech is a correct match.
Chameleons belong to the class Reptilia, which falls under the phylum Chordata. All chordates possess pharyngeal gill slits at some stage in their embryonic development. Therefore, the statement that they are absent in a chameleon embryo is incorrect.
Hence, the correct answer is option: 'C'.