ICSE/ISC Guess Paper 2009

Biology

Class XII

 

Q.1.           

a)      Fill in the blanks with appropriate                                                                        2½

 

i)                    The era which is popularly known as age of mammals is _______________

ii)                  In the lacteals the fatty acids are absorbed in the form of fat droplets called  ________

iii)                The sixth cranial nerve is also known as __________________

iv)                 The head of the epididymis is also known as __________

v)                   The pigment present in urine which imparts yellow colour to it is _______________

 

b)      Explain the following briefly                                                                                   3

 

i)                    Autochory

ii)                  Compensation Point

iii)                Chelators

 

c)      Give the contributions of the following scientists                                                2½ 

 

i)                    S.G.Nawaschin

ii)                  K.C.Hamner and J.Bonner

iii)                T.D.Lysenko

iv)                Godfrey Hounsfield

v)                  Billhoyer and Davidkhone

 

 

 Q.2.

a)      What is counter current mechanism. Explain in brief .                             4

b)      Describe the path of ascent of sap due to transpiration pull. What were the objections raised against this theory and how was it rectified.                  6

 

Q.3.

a)      Describe cytochrome pump theory for active absorption of minerals.          5

b)      Describe the life cycle of filarial parasite.                                                    5

 

Q.4.

a)      Give an account of process of urine formation and its hormonal control.      5

b)      Describe the process of hybridization.                                                            5

 

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