(Download) CBSE Class-12 Sample Paper And Marking Scheme 2019-20 : Biology

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(Download) CBSE Class-12 Sample Paper And Marking Scheme 2019-20 : Biology

Time allowed: 3 hrs 

Maximum Marks: 70

General Instructions:

1  There are a total of 27 questions and five sections in the question paper  All questions are compulsory 
2  Section A contains question numbers 1 to 5, multiple choice questions of one mark each 
Section B contains question numbers 6 to 12, short answer type I questions of two marks each 
Section C contains question numbers 13 to 21, short answer type II questions of three marks each 
Section D contains question number 22 to 24, case-based short answer type questions of three marks each 
Section E contains question numbers 25 to 27, long answer type questions of five marks each 
3  There is no overall choice in the question paper  However, internal choices are provided in two questions of one mark, one question of two marks, two questions of three marks and all three  questions of five marks  An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number  

SECTION – A

1  Androgens are synthesized by:
(a) Sertoli Cells
(b) Leydig cells
(c) Seminal vesicles
(d) Bulbourethral gland
OR
A procedure that finds use in testing for genetic disorders, but is also misused for female foeticide is:
(a) Lactational amenorrhea
(b) Amniocentesis
(c) Artificial insemination
(d) Parturition

2  Which type of immune response is responsible for the rejection of tissues/organs in the patient’s body post transplantation?
(a) auto-immune response
(b) humoral immune response
(c) physiological immune response
(d) cell-mediated immune response
OR
Rheumatoid arthritis is caused when      
(i) Lymphocytes become more active
(ii) Body attacks self cells
(iii) More antibodies are produced in the body
(iv) The ability to differentiate pathogens or foreign molecules from self-cells is lost
Choose the correct answer from the options given below:
(a) i and ii
(b) iii and iv
(c) i and iii
(d) ii and iv

 

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