Identify the incorrect statement regarding Class Cyclostomata?

(1) All are ecto-parasites on some fishes

(2) They have sucking and circular mouth without jaws

(3) Their body is devoid of scaled and paired fins

(4) The circulatory system is of open type

 

Cartilaginous fishes differ from bony fishes by :

1. presence of gill slits   

2. absence of operculum

3. presence of pectoral fins

4. presence of scales

In contrast to Annelids the Platyhelminths show

1. Absence of body cavity

2. Presence of pseudocoel

3. Radial symmetry

4. Bilateral symmetry

The number of correct statements, regarding cockroach, amongst the given statements is:

I. Dorsal sclerites are called as sternites and the ventral sclerites are called tergites.

II. While labrum is the upper lip and labium is the lower lip, the hypopharynx acts as tongue.

III. Anal cerci are seen in both sexes but anal styles are found in male cockroaches only.

IV. Each thoracic segment bears a pair of walking legs.

V. Forewings called tegmina are use in flight while the hind wings are opaque, dark and leathery.

 1.  2       

 2.  3

 3.  4     

 4.  5

Which of the following would be a characteristic of the animal shown in the given diagram?

1. Excretory organ is the proboscis gland.

2. They migrate for spawning to fresh water.

3. Notochord is present only in the larval tail.

4. Parapodia are present for swimming.

All cyclostomes are ___________ on some fishes; paired fins are _________, cranium is ________ and circulation is _______ type.

1. Ectoparasites, Absent, Cartilaginous, Open

2. Endoparasites, Present, Bony, Closed

3. Ectoparasites, Absent, Cartilaginous, Closed

4. Ectoparasites, Present, Cartilaginous, Open

Which of the following animals exhibit all these characters – bilateral symmetry, triploblastic, segmented and eucoelomate?

1.  Echinoderms

2.  Roundworms

3.  Molluscs

4.  Annelids

What is incorrect regarding cyclostomes?

1.  They are ectoparasites on some fishes

2.  They have a circular mouth without jaws

3.  Circulation is of open type

4.  They are marine but migrate to fresh water for spawning

Which of the following is not true about Porifera

1.Cellular level of organisation

2.Radial symmetry

3.Tissue is absent

4.Canal system is present

The central cavity of the sponges is known as

1.spongocoel

2.Ostia

3.Osculum

4.Gastro-vascular cavity