Fill in the blanks:

The connecting link between invertebrates and chordates is the (i)__ that belongs to the phylum (ii)_ and has a larval form called (iii)_ which resembles the larval form of (iv)_____.

(i) Asterias, (ii) Echinodermata, (iii) Tornaria, (iv) Hemichordata

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(i) Acorn worm, (ii) Hemichordata, (iii) Trochophore, (iv) Echinodermata

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(i) Acorn worm, (ii) Hemichordata, (iii) Tornaria, (iv) Echinodermata

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(i) Asterias, (ii) Echinodermata, (iii) Bipinnaria, (iv) Hemichordata

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Solution

The correct option is C
(i) Acorn worm, (ii) Hemichordata, (iii) Tornaria, (iv) Echinodermata

Acorn worm (Balanoglossus), belonging to the Phylum Hemichordata, is said to be the connecting link between the non-chordates and chordates. This is because it possesses certain characters found in chordates, in addition to many of its invertebrate features. The larval form of hemichordates is called tornaria, which resembles the bipinnaria larva of echinoderms.

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