Class Osteichthyes

Q.

What are the general characteristics of Osteichthyes?

Q.

Pseudocoelom occurs in

1. Fasciola hepatica

2. Planaria

3. Taenia solium

4. Ascaris

Q.

Which type of scales are present in Osteichthyes?

Q.

Write down four characters of Osteichthyes and give two examples.

Q. Assertion :Lancelets are jawless, primitive fish like vertebrates. Reason: In lancelets notochord, tubular nerve cord and pharyngeal gills slits arePresent throughout their life.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is incorrect and Reason is correct.
4. Both Assertion and Reason are incorrect.

Q. In cartilaginous fishes, gill slits are covered by an operculum.

1. True
2. False

Q. Tentacles of Sepia possess suckers

1. All along the inner surface.
2. All along the outer surface.
3. Both A and B.
4. At the tips.

Q. Which of the following belong to class osteichthyes?
A. Sea urchin B. Seahorse
C. Flying fish D. Sawfish
E. Dogfish

1. B & E
2. B & C
3. A, B & E
4. A, D & E

Q. Tube feet are locomotory organs of

1. Star Fish
2. Cockroach
3. Cuttle Fish
4. Cat Fish

Q.

An animal with lateral line.

Q.

________ is the class of fishes in which fins are supported with bony or horny spines which are directly attached to the body.

1. Chondrichthyes

2. Sarcopterygii

3. Osteichthyes

4. Actinopterygii

Q. Star fish is

1. Flat and radiate
2. Globular and radiate
3. Like a spiny ball
4. Cylindrical with repeatedly branched tentacles

Q. Which of the following are the distinguishing feature between betta & Carcharodon
a) Chambers in heart
b) Embryo development
c) No of gills
d) Endoskeleton

1. All of these
2. b, c, d
3. a, b, c
4. only c&d

Q. Number of tentacles in Octopus are

1. 4
2. 2
3. 10
4. 8

Q. Largest eyes are those of

1. Architeuthis
2. Sepia
3. Loligo
4. Octopus

Q. annelids and echinoderms are triploblastic but we know that notochord is formed from mesoderm. so why does they do not possess notochord?