Pick the odd pair out.

(1) Porifera : choanoflagellates

(2) Cnidaria : nematocysts

(3) Nematoda : pseudocoelom

(4) Mollusca : torsion

Subtopic:  Phylum Porifera |
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Chitin is a polysaccharide found in the exoskeleton of

(1) prawn

(2) insects

(3) crabs

(4) all of these

Subtopic:  Phylum Arthropoda |
 89%
From NCERT
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Which of these is not a coelenterate?

(1) Sea pen

(2) Sea fur

(3) Sea anemone

(4) Sea lily

Subtopic:  Phylum Echinodermata |
 72%
From NCERT
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Protonephridia are the excretory structures present in

(1) Planaria

(2) roundworm

(3) tapeworm

(4) Both 1 and 3

Subtopic:  Phylum Ctenophora & Platyhelminthes |
 75%
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Carapace is present can be observed in

(1) Hemidactylus

(2) Testudo

(3) Naja

(4) Bufo

Subtopic:  Study of Reptilia |
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Closed circulatory system is not found in

(1) octopus

(2) tunicates

(3) echinoderms

(4) squids

Subtopic:  Phylum Echinodermata |
 55%
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Polyp phase is absent in the life cycle of:

(1) Hydra

(2) Hormiphora

(3) Pennatula

(4) Physalia

Subtopic:  Phylum Coelenterata |
 50%
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Which of the following is a fish?

(1) Flying fish

(2) Jelly fish

(3) Devil fish

(4) Star fish

Subtopic:  Comparative study of Cartilagenous & Bony Fishes |
 74%
From NCERT
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Which of the following is not an annelid?

1. Leech

2. Earhtworm

3. Sea mouse

4. Sea cucumber

Subtopic:  Phylum Echinodermata |
 81%
From NCERT
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Buoyancy in a bony fish is maintained with the help of

(1) streamlined body

(2) paired fins

(3) swim bladder

(4) all the above

Subtopic:  Comparative study of Cartilagenous & Bony Fishes |
 62%
From NCERT
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