CBSE Class 9 Answered
(a) List four characteristic features of chordates.
(b) State reason for the following :
Arthropods have open circulatory system.
Asked by Topperlearning User | 31 Mar, 2016, 11:41: AM
Expert Answer
(a)Characteristic features of chordates:
i.Chordates have a dorsal, hollow, tubular nerve cord.
ii.They have a pliable rod called notochord that occurs ventral to nerve cord and is replaced by a bone or cartilage to form a vertebral column in vertebrates.
iii.They have paired gill-slits in the pharynx.
(b)Blood does not flow in well defined blood vessels.
Answered by | 31 Mar, 2016, 01:41: PM
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