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Posted By: richa Member Level: Silver Posted Date: 05 Jul 2008
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2008 Benaras Hindu University Zoology b.sc (hons)part 3 examination 2008 Question paper
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functional anatomy of non chordates
time 3 hours full marks 75
answer 5 questions including question 1 which is compulsory
illustrate your answer with suitable diagram wherever necessary
coloured diagrams are permitted
1_(A) =state weather the following statement are true or false giving in 2-3 sentences ;[marks5*1]
(a)bilateral symmetry is changed in gastropods to radial symmetry after coiling and torsion.
(b)sea cucumber exhibits remarkable power of autotomy and regeneration.
(c)the coelomoduct and nephridium are completely fused to form a simple funnel shaped structure called myxonephridium.
(d)excretory organ in Peripatus are segmentally arranged and are called metanephridium.
(e) Eulamellibranchiates are characterized by plaited and basket like gills.
(B) =_define the following- [marks 2*1]
(a) Typholosole
(b) green gland
(C)=differentiate between the following- [marks4*2]
(a)gustatory and olfactory sensilla
(b)Mehlis' gland and Laurer's canal
(c) Pedipalpi and Chelicerae
(d) Enterocoelome and schizocoelome
2.- classify annelida giving their diagnostic characters and examples up to classes.[marks 15]
3.- what is polymorphism?discuss the significance of polymorphism in coelentrates[marks 15]
4.- what is the metamerism? discuss its significance in invertebrates.[marks 15]
5.- describe the water vascular system in Astarias.[marks 15]
6.- write short notes on the following;[marks 3*5]
(a) Palmella stage
(b) symmetry in Echinodermata
(c)coral reefs
7.-describe briefly the different larval forms of echinodermata. discuss their evolutionary significance. [marks 15]
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