Select the incorrect statements with respect to Cyclostomes:
(a) They lack scales and paired fins.
(b) They have circular mouth with jaws.
(c) They bear 6-15 pairs of gills.
(d) They migrate to deep sea for spawning.
Choose the most appropriate answer from the options given below:
Exoskeleton of arthropods is composed of:
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : All vertebrates are chordates but all chordates are not vertebrates.
Reason (R) : Notochord is replaced by vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the option given below:
| List-I | List-II | ||
|---|---|---|---|
| (a) | Physalia | (i) | Pearl oyster |
| (b) | Limulus | (ii) | Portuguese Man of War |
| (c) | Ancylostoma | (iii) | Living fossil |
| (d) | Pinctada | (iv) | Hookworm |
Choose the correct answer from the options given below.
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