Question

please help me with these questions. they are very short. i know, but i cant post anymore questions after this. please can you answer all. thank you so much in advance.

Which of the following is only found in rotifera? Blue blood Chelipeds Flame cells O Mastax Complete digestive system

Answer 1

1.Correct Answer: d, Mastax. Rotifers are microscopic, aquatic invertebrates that has circular arrangement of moving cilia at the front and resembles a rotating wheel. Mastax is muscular pharynx containing masticatory jaws and its function is to grind the food particles.

2.Correct Answer: b, Cnidaria. Cnidaria are acquatic, mostly marine organisms. A planula is the free-swimming, flatened, ciliated, bilaterally symmetric larvae found in Cnidaria.

3.Correct Answer: a, Cnidocytes. Cnidocytes are the specilized cells of Cnidaria that are located around the mouth and on the tentacles and serves to capture prey or repel predators.

4.Correct Answer: e, Bivalves and Gastropods. A veliger larva is the planktonic larva of many kinds of sea-snails. It is the characteristic larva of Bivalves and Gastropods. It develops from trochophore larva and has large ciliated lobes.

5.Correct Answer: c, Iophophore. Marine invertebrates have a structure with the shape of a Horseshoe and bears ciliated tentacles around mouth known as Iophophore. Cilia in Iophophore grooves bring food particles that are often trapped in mucus to the mouth.

6.Correct Answer: a, Multicellularity. Apomorphy is a novel evolutionary trait that is unique to a particular species and all its descendants and which can be used as a defining charecter for a species or group in phylogenetic terms. Metazoa is a group of multicellular animals excluding Porifera (Sponges) .

7.Correct Answer: d, Mantle. In shelled Molluscs, the mantle is the organ that forms the shell. The epithelial cells in the mantle releases liquid shell materials which harden on contact with water or air.

8.Correct Answer: a, Gastropods. Tortion in gastropods synapomorphy which occurs in all gastropods during larval development. Tortion is the rotation of the visceral mask, mantle and shell 180 degrees with respect to the head and foot of the gastropods.

9.Correct Answer: c, Parthenogeneticaly. Some species of rotifers consist only of females that produce their daughters from unfertilized eggs, a type of reproduction called Parthenogenesis.

10.Correct Answer: b, Anthozoa. The class Anthozoa includes all Cnidarians that exhibit a polyp body plants only i.e. there is no medusa stage within their life cycle.

11.Correct Answer: e, None of the Above. The Radula is the toothed chitinous ribbon in the mouth of most molluscs . It is used for cutting and chewing food. Before it enters the Esophagus.