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Select the incorrect statement about chordata:
    a) Post anal tail present
    b) A notochord present
    c) CIrculatory system open type
    d) Radially symmetrical
Choose from the following:
Option: 1
A and C

Option: 2
A and D

Option: 3
C and D

Option: 4
B and C

Answers (1)

best_answer

Phylum Chordata -

The phylum chordata is characterized by the following:

Notochord:

The name ‘Chordata’ is based on the presence of notochord at some stage or throughout the life cycle.
It is a rod-like structure placed dorsally between the alimentary canal and nerve cord.
It is derived from the mesoderm.
In vertebrates, it is present during the embryonic development.
It is then replaced by the vertebral column (spine) in the postnatal stage.

Dorsal Hollow Nerve Cord:

It is placed dorsally to the notochord.
It is hollow rod and is derived from the ectoderm.
It develops into the brain and spinal cord and forms the central nervous system.

Pharyngeal Gill Slits:

These are the openings present in the pharynx.
They allow the entry and exit of water in aquatic animals.
In vertebrate fishes, these develop into gills. In tetrapods, these are modified into tonsils and components of ears.

Post-anal Tail:

It is the posterior elongation of the body that goes beyond the anus.
It consists of skeletal elements and muscles.
It helps in locomotion in fishes and in balancing, courting etc. in terrestrial vertebrates.
In is reduced and non-functional in man.

-

Chordates have a closed circulatory system and are bilaterally symmetrical.

Posted by

Deependra Verma

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