Question 1

In which class of Coelenterate, the polyp and medusa both are found in one animal?

Accepted Answer

Hydrozoa Cnidarians exhibit two basic body forms called polyp and medusa. The former is a sessile and cylindrical form like Hydra, Adamsia, etc. whereas, the latter is umbrella-shaped and free-swimming like Aurelia or jellyfish. These Cnidarians, which exist in both forms exhibit alternation of generation (Metagenesis), i.e., polyps produce medusae asexually and medusae form the polyps sexually (e.g., Obelia).

Question 2

The blind sac body plan is applicable to

Accepted Answer

The blind sac body plan is the body plan where the there is a single opening of the digestive system. The tube-like digestive system starts with a single opening through which the food is taken inside and the digested food is expelled through the same opening. The gut is lined with a single layer of endodermal cells that absorb and digest food. Cnidaria and Platyhelminthes exhibit this type of body plan.So, the correct answer is option C.

Question 3

Which of the following exhibits metagenesis?

Accepted Answer

Life History of Obelia includes both asexual and sexual generations that alternate with each other to complete the life cycle. Such alternation of generation in which the asexual polypoid generation appears to alternate regularly with the sexual medusoid generation but both forms are diploid, is called Metagenesis.So the correct answer is 'Obelia'.

Question 4

In molluscs, feather-like gills are present in mantle cavity.

Accepted Answer

These gills have respiratory and excretory functions.

Question 5

Water vascular system is the characteristic of which group among the following:(a) Porifera (b) Ctenophora (c) Echinodermata (d) Chordata

Accepted Answer

Echinoderms have a water-driven tube system that the members of this phylum use for their locomotion. This system is also known as the water vascular system. It also helps in food capturing. So, the correct answer is option C.

Question 6

Between ectoderm and endoderm an undifferentiated layer mesoglea is not present in ________.

Accepted Answer

Mesoglea is the undifferentiated layer which is present between the ectoderm and endoderm. Coelenterata and Ctenophora show the scattered pouches in between ectoderm and endoderm. These groups have true body cavity. They are Pseudocoelomates. However, this layer is not present in Platyhelminthes. In these animals, the body cavity is absent. They are also called as acoelomates.Thus, the correct answer is 'Platyhelminthes.'

Question 7

Match the following and select the correct option from the codes given below.Column IColumn IIA.Physalia(i)Sea anemoneB.Meandrina(ii)Brain coralC.Gorgonia(iii)Sea fanD.Adamsia(iv)Portuguese man-of-war

Accepted Answer

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Question 8

Match the following and choose the correct option(i)Physalia(a)Sea Anemone(ii)Meandrina(b)Brain Coral(iii)Gorgonia(c)Sea Fan(iv)Adamsia(d)Portuguese Man of War

Accepted Answer

(i) Physalia is also know as Portugues manof war is a marine hydrozoan found in the Athantic, Indian and Pacific oceans.(ii) Meandrina is a genus of colonial stony croalsin the family meadrinidae.(iii) Gorgonia is a genus of soft corals, sea fansin the family Gorgoniidae.(iv) Adamsia is a genus of sea anemones in the family tlormathiidae.$ i-d,ii-b,iii-c,iv-a $

Question 9

Select the taxon mentioned that represents both marine and fresh water species

Accepted Answer

Cnidararians are aquatic, mostly marine , solitary or colonial sessile or free swimming radially symmetry animals while members of Ctenophora, Cephalochordata, Echinodermata are found exclusively in the marine environment.So the correct answer is 'Cnidaria'.

Question 10

Animal of which phylum have hooks and suckers and are endoparasite on other animals?

Accepted Answer

Platyhelminthes or flatworms are dorsoventrally flattened and bilaterally symmetrical worms. They are endoparasites and have parasitic adaptations like hooks and suckers.So the correct option is A.

Ctenophora

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