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Thursday, December 10, 2020

Class XII SCI Class Test Sub: Biology

 

 

                                                            SECTION (A)

Q.1: Select & rewrite correct sentence from the given alternatives.   3marks


 1) griffith worked on _______

            a)bacteriophage                      b) Drosophila

c)frog egg          d) streptoccocus pnemonia                          

2)      unique chemical substance which cell realease nuclei___________
a) nuclein        
b) inferon gamma
c) tumor necrotic factor                     
d) non of above

      3) _______is a transforming principle
            a) griffith experiment b) aswald avery & maccarthy macloid

            c) hershy chase experiment           d) urey miller experiment                         

 

                                                                       

Q2 )  Answer the fallowing                                                                                                   02 Marks                                                                                                                                                       

1)      Define- transforming principle

2)      explain -genetic material

SECTION(B)

 Attempt any 4 Short Answer                                                                      2marks

Q3) Enlist the characteritcs of genetic code


 

                                    SECTION  (C)

Attempt any 4                                                                                   3 marks

Q4) explain griffith experiment