Subphylum: Urochordata
Subphylum: Urochordata: Overview
This topic covers the concept of Urochordata.
Important Questions on Subphylum: Urochordata
Assertion: Acraniata is a group of organisms which do not have distinct cranium.
Reason: It includes small marine forms.

Read the following and choose the correct combinations.
S.No. | Group | Character | Example |
I | Tunicata | Bioluminescence | Pyrosoma |
II | Osteichthyes | Pelvic fins with claspers | Echeneis |
III | Mammalia | Six cervical vertebrae | Bradypus |
IV | Caecilians | Amphicoelous vertebrae | Ichthyophis |

Identify the correct statements with reference to Urochordata.
A Circulatory system is closed type.
B. Atrial cavity is lined with ectoderm.
C. Notochord is confined to the tail only.
D. Burrowing mode of life.

Paired appendages are not found in

In which of the following animals notochord is not present?

During retrogressive metamorphosis of the ascidian tadpole, which one of the following does not regress?

Test (tunic) of Herdmania is a thick protective covering. The test is composed of tunicine which is a

At retrogressive metamorphosis the urochordate larva

Identify the wrong statement about the embryological evidence of evolution.

Cotyledons are also called-

In which among the following animals, retrogressive metamorphosis is found?

Given below are four matchings of an animal and its kind of respiratory organ :
(A) Silver fish - trachea
(B) Scorpion - book lung
(C) Sea squirt - pharyngeal gills
(D) Dolphin - skin
The correct matchings are
