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NTA Abhyas NEET2020BotanyAnimal KingdomPractice

Select the incorrect statement.

Options

  1. AJawless fishes have 6-15 pairs of gill slits.
  2. BReptiles have three-chambered heart except crocodile and cleidoic eggs
  3. CChordates have a solid dorsal nerve cord & notochord.
  4. DUrochordata and Cephalochordata are often referred to as protochordates.

Correct answer

C. Chordates have a solid dorsal nerve cord & notochord.

Step-by-step solution

Animals belonging to phylum Chordata are fundamentally characterized by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits. These are bilaterally symmetrical, triploblastic, coelomate with organ-system level of organization. They possess a post-anal tail and a closed circulatory system. All chordates possess this character at certain stage of their life cycle.

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