Which one among the following is not a phylum ?
(a) Protozoa
(b) Mammalia
(c) Echinodermata . (d) Chordata
Ant eaters are :
(a) Egg laying mammals (b) Flying mammals
(c) Gnawing mammals (d) Toothless mammals
One of the primary caracters of chordata is ::
(a) Ganglionated nerve cord
(b) Dorsal tubular nerve cord
(c) Solid ventral nerve cord
(d) Paired nerve cord
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Answer:
Mammalia, egg laying mammals,dorsal tubular nerve cord are the respective answers.
Explanation:
1.Mammalia is a class of Phylum Chordata while the other three are phyla.
2.Ant eaters are an exception to mammals because they lay eggs instead of giving birth to their offspring like other mammals.
3.Phylum Chordata is characterised by the presence of a dorsal tubular nerve cord. However, most chordates have a notochord in embryonic life.
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