NEET 2008 Biology question

Which one of the following phyla is correctly matched with its two general characteristics?

(1)Mollusca - Normally oviparous and development through a trochophore or veliger larvaCorrect
(2)Arthropoda - Body divided into head, thorax and abdomen and respiration by tracheae
(3)Chordata - Notochord at some stage and separate anal and urinary openings to the outside
(4)Echinodermata - Pentamerous radial symmetry and mostly internal fertilization

Answer: (1)

Solution

Molluscs are usually dioecious and oviparous, and their development is indirect through a trochophore or veliger larva. Hence option (1). (2) Arthropods do not all have a head, thorax and abdomen (e.g. spiders have a cephalothorax)

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Question ID VK-090040