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Characteristic Features of Animal Groups
Concepts tested here
- Matching animals with their features
All Questions
2007 AIPMT-PRE 1 question
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Which of the following pairs are correctly matched?
Animals - Morphological features
(i) Crocodile - 4-chambered heart
(ii) Sea urchin - Parapodia
(iii) Obelia - Metagenesis
(iv) Lemur - Thecodont(i) Crocodile belongs to class Reptilia. Most reptiles have a three-chambered heart, but crocodiles have a four-chambered heart. Correct.
(ii) Sea urchin is an echinoderm; it moves by tube feet of the water vascular system. Parapodia are the lateral appendages of polychaete annelids such as Nereis. Incorrect.
(iii) In Obelia, the polyps produce medusae asexually and the medusae form the polyps sexually. Such alternation of asexual and sexual phases in the life cycle is called metagenesis. Correct.
(iv) Lemur is a mammal (a primate). In mammals the teeth are embedded in the sockets of the jaw bones, a condition known as thecodont. Correct.
So the correctly matched pairs are (i), (iii) and (iv).