Exercises on subphylum Urochordata

The animals of subphylum Urochordata belong to phylum of chordates, can also be called tunicates and are mainly represented by sea squirts.

We prepared a list of exercises on subphylum Urochordata so you can test your knowledge about these protochordate animals.

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Exercises on the subphylum Urochordata

1) (UFRGS) Tunicates, such as ascidians, and cephalochordates, such as amphioxus, are examples of:

a) bony fish.
b) echinoderms.
c) non-vertebrate chordates.
d) cnidarians.
e) urodeles.

2) (UFSCar) Adult ascidians are typical tunicates. About these animals we can say that:

a) under no circumstances can they be classified as chordates, since when adults they do not have a notochord.
b) they are chordates, since in the larval stage they have a notochord, as well as gill slits and a dorsal nerve tube.

c) the presence of gill slits in the pharynx is not enough to classify them as chordates.
d) they are not chordates, because even in the larval stage they do not have a notochord.
e) in the larval stage, they have a well-developed dorsal nerve tube in the tail, which served to confuse them with true chordates.

3) (Unigranrio) Sea squirts are marine animals that can live isolated or forming colonies. One of the isolated forms often found on Brazilian beaches resembles, in adults, a piece of tar from approximately 8 cm high, attached by one of its ends to the substrate (rocks, ship hulls etc.). _{Adapted from Just Biology: .}

Within the classification of living beings, ascidians belong to the classification:

a) subphylum Urochordata.
b) subphylum Cephalochordata.
c) agnates.
d) subphylum Vertebrata.
e) gnathostomes.

4) Urochordates are marine animals found in both cold and warm regions. These beings are also called tunicates due to the presence of:

a) a substance similar to cellulose, which forms the so-called tunic.
b) a polysaccharide similar to keratin, which forms the tunica.
c) a starch-like substance that forms the tunic.
d) a polysaccharide similar to glycogen, which receives the name of tunicide.

5) (UFPR) Two Biology students found in the sea, near the beach, an organism they had never seen before. seen before, but who, based on their previous knowledge, assumed that it could be a porifera or a urochordate. How should they proceed to decide which group this organism belongs to?

a) Determine whether it is unicellular or multicellular.
b) Check if it is a prokaryote or a eukaryote.
c) Find out if it is sessile or if it moves on a substrate.
d) Find out if it is predominantly aquatic or terrestrial.
e) Check if it has a digestive tract.

6) Among the best known urochordates, we can mention the ascidians. These animals are characterized by having:

a) notochord only in the larval stage and located throughout the length of the body.
b) notochord throughout the animal's life and located throughout the length of the body.
c) notochord throughout the animal's life and restricted to the tail region.
d) notochord only in the larval stage and located in the tail region.
e) notochord, but without gill slits and nerve tube.

7) (UFES) Ascidians, marine animals with a body shape similar to that of Porifera, are considered closely related to vertebrates due to the fact that their larva presents, among other things, characteristics:

a) ventral heart and dorsal nerve tube.
b) notochord and gill slits.
c) bilateral symmetry and post-anal tail.
d) paired fins and notochord.
e) dorsal nervous tube and eye with retina.

8) Urochordates feed by filtration. Water enters through the ________________, then food is filtered through the ________________ and unused waste is eliminated through the ________________.

Mark the alternative that correctly completes the statement above:

a) exhalant siphon, stomach, inhalant siphon.
b) inhalant siphon, gill slits, exhalant siphon.
c) inhalant siphon, atrium, exhalant siphon.
d) inhaling siphon, exhaling siphon, tunic.
e) exhalant siphon, gill slits, inhalant siphon.

9) (FUVEST) In the development of chordates, three general characters stand out, distinguishing them from other animals. Tick ​​the alternative that includes these three characters:

a) notochord, three germ layers, dorsal nerve tube.
b) segmented body, complete digestive tube, dorsal nerve tube.
c) bilateral symmetry, segmented body.
d) bilateral symmetry, three germ layers, notochord.
e) dorsal nerve tube, notochord, gill slits in the pharynx.

10) The adult individual of the subphylum Urochordata differs from the individual in the larval phase, because:

a) has notochord only in the posterior region of the body.
b) is fixed to the substrate.
c) has a notochord along the entire length of the body.
d) is free and swimming.

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