‘Cephalization’ in animals was facilitated by evolution of:
1. Radial symmetry
2. Tissue grade organization
3. Bilateral symmetry
4. True coelom
Identify the correct statement:
1. All pseudocoelomates are protostomes
2. All bilaterally symmetrical animals have a coelom
3. All animals have at least a tissue grade organization
4. All radially symmetrical animals are diploblastic
Animals with bilateral symmetry have all the following except:
1. Anterior and posterior end
2. Right and left half
3. Dorsal and ventral surface
4. Oral and aboral surface
Biradial symmetry is seen in members of:
1. Cnidaria
2. Ctenophora
3. Molluska
4. Hemichordata
A cell isolated from a four-cell stage larva can develop into a complete animal in:
1. Snail
2. Earthworm
3. Sea urchin
4. Drosophila
Triploblastic organization, bilateral symmetry but lack of coelom will be seen in:
1. Planaria
2. Pheretima
3. Periplaneta
4. Pinctada
All the following are feature of non chordates except:
1. A dorsal heart, if present
2. Ventral, solid and double central nervous system
3. Absence of gill slits
4. Post anal tail
Identify the incorrectly matched pair:
Phylum |
Characteristic |
|
1. |
Porifera |
Water vascular system |
2. |
Ctenophora |
Bioluminiscence |
3. |
Molluska |
Radula |
4. |
Annelida |
Closed circulatory system |
Cyclostomes:
1. are fresh water organisms that move to marine water for spawning
2. have an open circulatory system
3. have a sucking and circular mouth without jaws
4. have scales on body and paired fins
Identify the number of animals that do not have homoiothermy from the list given in the box below:
Aptenodytes, Hemidactylus, Pteropus, Icthyophis, Pterophyllum, Carcharodon, Neophron, Myxine
1. 3
2. 4
3. 5
4. 6
The animals belonging to all the following groups are exclusively marine except:
1. Ctenophora
2. Porifera
3. Protochordata
4. Echinodermata
All the following would be characteristics of a general reptile except:
1. Dermal scales or scutes
2. Poikilothermy
3. Direct development
4. Heart usually three chambered
Which of the following statements regarding Chondrichthyes may not be true for majority of members of the class?
1. Notochord is persistent throughout life.
2. Skin has placoid scales.
3. Fertilization is internal.
4. Mouth is located ventrally.
In having external fertilization and indirect development, amphibians differ from all other:
I. Tetrapods
II. Gnathostamatans
III. Vertebrates
1. Only I
2. Both I and II
3. Only II
4. I, II and III