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
Application Videos
Concept Videos
CBSE 9 - Biology
What is the difference between the heart structure of cold blooded animals and warm blooded animlas?
Asked by is00331 | 24 Apr, 2021, 08:24: PM
ANSWERED BY EXPERT
CBSE 9 - Biology
Asked by nikhilshukla.464 | 14 Dec, 2020, 11:18: PM
ANSWERED BY EXPERT
CBSE 9 - Biology
Asked by Prachi9.gangrade | 09 Feb, 2020, 09:44: PM
ANSWERED BY EXPERT
CBSE 9 - Biology
Asked by deepali.09deshmukh | 17 Sep, 2019, 07:00: PM
ANSWERED BY EXPERT
CBSE 9 - Biology
Asked by deepali.09deshmukh | 13 Sep, 2019, 07:41: PM
ANSWERED BY EXPERT
CBSE 9 - Biology
Asked by abhagupta7880 | 17 Feb, 2019, 10:23: AM
ANSWERED BY EXPERT
CBSE 9 - Biology
Asked by anvithachoudary10 | 17 Aug, 2018, 10:48: AM
ANSWERED BY EXPERT
CBSE 9 - Biology
Asked by Topperlearning User | 09 May, 2016, 07:24: AM
ANSWERED BY EXPERT
CBSE 9 - Biology
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT
CBSE 9 - Biology
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT