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Match the following and choose correct combination.

Column I Column II
i) Cellular grade level a) Pheretima
ii) Tissue grade level b) Schistosoma
iii) Organ level c) Obelia
iv) Organ system level d) Sycon

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Important Questions on Structural Organization in Animals

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True symmetry found in an animal which can be divided into two similar halves by one plane only is ____.
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Radial symmetry is often exhibited by animals having        
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Study the following statements
A) Compound epithelium forms the lining of the larger pancreatic ducts as stratified cuboidal epithelium
B) Cartilage is a vascular tissue surrounded by fibrous connective tissue sheath called perichondrium
C) Gap junctions in cardiac muscles permit electrical impulses to be conducted rapidly
D) Myelinated nerve fibres are found in grey matter of the central nervous system

Among the above, identify incorrect statements

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Study the following statements and identify the correct statements-
I) Microglial cells keep the cerebrospinal fluid in the ventricles of brain in constant circulation
II) Arrector pili muscles are unstriated muscles
III) Basophils remove antigen-antibody complexes from the blood
IV) Perichondrium is absent in fibrous cartilage

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Assertion (A) : Skeletal muscle fibre is in syncytial state
Reason (R):  It is formed by fusion of cells
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Label the parts corresponding to the alphabets in the given diagram given?

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In the abdomen of Cockroach, the ventral nerve cord is absent in the following segments