NEETBiologyAnimal KingdomMCQ+4 / −1
The following are the statements about non-chordates:
A. Pharynx is perforated by gill slits.
B. Notochord is absent.
C. Central nervous system is dorsal.
D. Heart is dorsal if present.
E. Post anal tail is absent.
Choose the most appropriate answer from the options given below:
- AA & C only
- BA, B & D only
- CB, D & E only
- DB, C & D only
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Correct answer: C
The correct answer is Option C: B, D & E only. Here's why:
- B. Notochord is absent: This is the defining characteristic of non-chordates. Chordates possess a notochord at some stage of their development, while non-chordates do not.
- D. Heart is dorsal if present: In non-chordates with a circulatory system, the heart is located on the dorsal (back) side of the body, unlike chordates where it's ventral (front).
- E. Post anal tail is absent: Non-chordates lack a post-anal tail, a feature present in chordates.
Why the other options are incorrect:
- A. Pharynx is perforated by gill slits: This is a characteristic of chordates, particularly in aquatic forms for respiration.
- C. Central nervous system is dorsal: While this is true for chordates, non-chordates have a ventral nerve cord.
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