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Read the following statements
I. The adult urochordates possess pharyngeal gill slits.
II. Urochordates are hermaphroditic animals.
III. The notochord, nerve cord and post-anal tail disappears in adult urochordates.
IV. Urochordates are also called tunicates
Choose the option with all correct statements
Option: 1
I, II and III only
Option: 2
II and IV only
Option: 3
I and IV only
Option: 4
All of the above
Answers (1)
Phylum Urochordata - Characteristics Features -
- These animals are also called tunicates because of the presence of cellulose-like carbohydrate material called tunic that covers the outer body surface of these animals.
- They possess notochord only during the larval stage. The notochord at this stage is confined to the tail region only.
- The adult tunicates have only one feature of chordates, i.e., pharyngeal gill slits. The notochord, nerve cord and post-anal tail disappears in adults.
- They are hermaphroditic animals. The larvae hatch from the eggs inside the body of adult tunicate.
- Most of the Urochordates are sessile.
- They feed on plankton and detritus.
- The following figure shows the comparative diagrams of larval and adult tunicate:
-
Hence, all of the above is correct
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