A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
Hemichordata or Adelochordata are tongue worms which have been included for long as a subphylum or class of phylum chordata in the lower chordates or protochordata, but now they are placed as an independent phylum of invertebrates, since their supposed affinities with chordates are doubtful. In most forms one to several pairs of gill clefts lead from the pharynx to the exterior. They have no body tissue, but a buccal diverticulum is present in the pre-oral region, which is often regarded as notochord. These are the characters for which previously hemichordates were taken under chordata.
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