Which of the following are the features of chordates? (1)...

Which of the following are the features of chordates?
(1) Notrchord is present.
(2) CNS is dorsal, hollow and single.
(3) Pharynx is perforated by gill slits.
(4) Heart is ventral.
(5) A post-anal is present
(a) All except (4)
(b) All except (2)
(c) All of these
(d) All except (5)

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Key Concepts

Notochord

The notochord is a flexible, rod-shaped structure that provides support during early development. It is a defining characteristic of chordates and plays a crucial role in the development of the vertebral column in higher chordates.

Central Nervous System

In chordates, the central nervous system (CNS) is characterized by its dorsal, hollow configuration. The CNS develops into the brain and spinal cord, where the dorsal positioning is an important developmental and functional feature.

Pharyngeal Slits

Pharyngeal slits are openings in the pharynx that are present in chordates. These structures have roles in filter-feeding and respiration in various chordate groups and represent one of the key traits of the phylum.

Ventral Heart

In many chordates, especially vertebrates, the heart is located on the ventral side of the body. This ventral positioning is integral to the circulatory system layout and function, ensuring effective blood distribution.

Post-anal Tail

A post-anal tail is an extension of the body past the anal opening. This feature is significant in chordates as it may aid in locomotion and balance, and it is one of the hallmark characteristics of the phylum.

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