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Exchange of Gases in Fishes

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Question

Write relevant phylum/class for each of the following.
(A) A blood fluke that has two suckers and no body cavity.
(B) A terrestrial organism with three pairs of jointed appendages attached to each of its spires through the trachea.
(C) Soft-bodied animals enclosed in bivalves calcareous shell.

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Solution

(A) Cestoda is a class of parasitic worms in the flatworm phylum (Platyhelminthes).
(B) Insects or Insecta (from Latin insectum) are hexapod invertebrates and the largest group within the arthropod phylum.
(C) The mollusc (or mollusk) shell is typically a calcareous exoskeleton which encloses, supports and protects the soft parts of an animal in the phylum Mollusca, which includes snails, clams, tusk shells, and several other classes.

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Q. Match the terms given in column 'A' with those in column 'B'.

	Column A		Column B
a)	Nematoda	i.	an organism with a 4- chambered heart, a body covering of hair, external ears and suckles its young.
(b)	Mammalia	ii.	shelled organism with a large flat foot and one or more pairs of tentacles.
(c)	Echinodermata	iii.	a roundworm which has a 3-lipped mouth, is parasitic in the intestine of man.
(d)	Arthropoda	iv	a terrestrial organism with two pairs of jointed appendages attached to each of its many body segments and respires through tracheae.
(e)	Mollusca	v.	a spiny- skinned marine organism with calcareous exoskeleton, with radial symmetry, body parts occurring in fives and a water vascular system.
(f)	Agnatha	vi.	a jawless, parasitic vertebrate which attaches to, and sucks blood from fishes.
(g)	Reptilia	vii.	a limbless land animal without external ears but with forked tongue.

In phylum ______, the animals have a soft, unsegmented body, with a hard, calcareous shell to protect the soft body.

Q. Column II below consists of brief description of organisms in column I. Which of the following is incorrect match between column I and column II

	Column I	Column II
A	Millipede	A terrestrial organism with two pairs of jointed appendages attached to each of its many body segments and respires through trachea.
B	Nerels	Numerous setae on leteral appendage called parapodia.
c	Taenia sollum	Body is covered with cuticle, alimentary canal absent.
d	Ctenophores	Radially symmetrical, devoid of cnidoblasts, polpy stage present in their life cycle.

Q. 'X' is a phylum which has organisms with jointed appendages, and a segmented body.
'Y' is a phylum which has organisms with a notochord present at some stages of their life.
Identify 'X' and 'Y'.

Q. On the basis of characteristics given below name the phyIum or class for each:
Body segmented-with jointed appendages and compound eyes ____.

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