Question
Which of the following pairs are correctly matched? [CBSE AIPMT 2007]
Animals Morphological features
(i) Crocodile – Four-chambered heart
(ii) Sea urchin – Parapodia
(iii) Obelia – Metagenesis
(iv) Lemur – Thecodont
(a) (i) (iii) and (iv)
(b)(ii) (iii) and (iv)
(c) Only (i) and (iv)
(d) Only (i) and (ii)
Answer/Explanation
Ans. (a)
Exceptionally, crocodile has
four-chambered heart. In Obelia the alternation of generation is called metagenesis in which an asexual polypoid generation appears to alternate regularly with a sexual medusoid generation.
Thecodont dentition is found in mammals.
Question
In which of the following animal, post-anal tail is found? [CBSE AIPMT 2001]
(a) Earthworm
(b) Lower invertebrate
(c) Scorpion
(d) Snake
Answer/Explanation
Ans. (d)
In snakes, post-anal tail is found. Snakes belong to class-Reptilia. Jurassic period (Mesozoic era) is known as Golden age of reptiles. The study of snake is known as serpentology.