Skip to main content


Type study: Starfish (Complete topic)
Time: 2 hr.                                                                                                  Date: 05/10/14
Max Marks: 40

Q1. Answer the following in one to two sentences                          [10X1=10]
             i.      What is madreporite?
           ii.      Explain functions of coelom in starfish?
        iii.      What are the different larval forms seen during development of starfish?
        iv.      What are tube feet?
           v.      Explain the functions of Tiedemann’s Body.
        vi.      Enlist the structures present on aboral surface
      vii.      Write the systematic position of Asterias.
   viii.      Explain autotomy.
        ix.      What are the different types of enzymes produced by pyloric cecae?
           x.      Explain the symmetry in starfish.
Q2. Answer any two of the following                                             [5X2=10]
             i.      Describe the feeding mechanism in starfish.
           ii.      Explain the process of Autotomy and Regeneration in starfish
        iii.      Describe digestive system of Starfish

Q3. Answer any two of the following                                             [5X2=10]
             i.      Describe the Water vascular system in starfish
           ii.      Describe reproductive system in starfish.
        iii.      Explain the structure of Pedicellariae in starfish

Q4. Answer any one of the following                                             [10X1=10]
             i.      Explain the process of development in starfish

           ii.      Give an account of structures present on oral and aboral surface

Comments

Popular posts from this blog

Parthenogenesis When development of organism takes place without fertilization, the process is called as parthenogenesis. Parthenogenesis is of two types viz. 1.       Natural 2.       Artificial Natural parthenogenesis: ·          Eggs that develop without fertilization naturally, the process is called as natural parthenogenesis. ·          It is commonly seen in Aphids, Phyllopods and Rotifers at sometimes of the years not always ·          Whereas in case of bees and wasps males are always produced from unfertilized egg. Thus, males are always haploid and females are diploid because females are produced from fertilized egg. ·          In some species such as Tenthredinidae, reproduction is alays parthenogenetically and males of this species are not known. Artificial parthenogenesis: ·          In normal conditions some eggs do not develop unless they are fertilized. ·          In such conditions, when ripe egg is induced artificially the development start

Starfish: External Characteristics

STARFISH SYSTEMATIC POSITION Kingdom: Animalia    Phylum: Echinodermata       Class: Asteroidae          Order: Forcipulata             Family: Asteriidae               Genus:   Asterias                  Species:   rubens HABIT & HABITAT: 1.        Asterias is exclusively marine in nature 2.        It is mostly found on sea costs and in shore waters 3.        It generally prefers rocky areas where locomotion and concealment is easier 4.        It is bottom dwelling benthoic organism 5.        It clings to submerged objects by firmly attaching to them. 6.        It is solitary in nature in normal conditions 7.        Asterias is strongly positive towards light whereas other genus are negative towards light 8.        It is carnivorous and voracious feeder 9.        It is nocturnal in nature 10.   It shows remarkable power of autotomy and regeneration EXTERNAL CHARACTERISTICS: A.        SIZE & SHAPE: 1.        Body is star
Introduction to Cell Biology -          Cell was discovered by Robert hook -          He has observed compartment like structure in section of cork -          Cell Theory:  All organisms are made up of cells. This theory was proposed by Scheilden & Schwan -           Modified version o f Cell theory: All the organisms are made up of cell & cell products. -          Types o f Cells:  There are two types of cells viz. 1.      Prokaryotic cell 2.      Eukaryotic cell 1.      Characters of Prokaryotic Cell:                                i.             The cells in which nuclear membrane and cell organelles are absent are called as prokaryotic cell.                              ii.             The region in prokaryotic cell where DNA is present is called as nucleoid region/nuclear region .                           iii.             DNA is in the form of circular DNA.                           iv.             Different enzymes required for cellul