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CBSE Class 12 Biology Sample Paper 2020 has been released

Nithya

Updated: Sep 27,2019 16:48 IST
CBSE Class 12 Biology Sample Paper 2020 has been released
CBSE Class 12 Biology Sample Paper 2020 has been released

Students are advised to download the CBSE Class 12 Biology Sample Paper 2020, which is more important for the preparation of CBSE Class 12 Biology Exam 2020. In order to help the students to prepare effectively for CBSE Class 12 Biology  Exam 2020, the CBSE exam board released the Sample Paper on 22nd August 2020 and complete information on CBSE Class 12 Biology Sample Paper 2020 is provided here.

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What is the exact latest CBSE Class 12 Biology Sample Paper 2020?

Central Board of Secondary Education (CBSE) is looking for young, committed and passionate workers various. Candidate can use this opportunity and prepare for the examination. Here, Students can get the Sample Paper for CBSE Class 12 Biology  Exam 2020. Example of some questions from sample paper has been given in the below table,

 

CBSE Class12 Biology Sample Papers 2020

Sample Question Paper

Class XII (2019-20)

Biology (044)

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.

3. Section B contains question numbers 6 to 12, short answer type I questions of two marks each.

4. Section C contains question numbers 13 to 21, short answer type II questions of three marks each.

5. Section D contains question number 22 to 24, case-based short answer type questions of three marks each.

6. Section E contains question numbers 25 to 27, long answer type questions of five marks each.

7. 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

Question 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

Question 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) The 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

Question3. Name the enzymes 'P' and 'Q' that are involved in the processes given below

(a) Enzyme P-Exonuclease and Enzyme Q-Permease

(b) Enzyme P-Exonuclease and Enzyme Q- Ligase

(c) Enzyme P-Endonuclease and Enzyme Q- Permease

(d) Enzyme P-Restriction endonuclease and Enzyme Q-Ligase

Question 4. A biotechnologist wanted to create a colony of E.coli possessing the plasmid pBR322, sensitive to Tetracycline. Which one of the following restriction sites would he use to ligate a foreign DNA?

(a) Sal I

(b) Pvu I

(c) EcoRI

(d) Hind III

Question 5. The most important cause of biodiversity loss is:

(a) Overexploitation of economic species

(b) Habitat loss and fragmentation

(c) Invasive species

(d) Breakdown of plant-pollinator relationships

6. How does an encysted Amoeba reproduce on the return of favorable conditions? OR What are gemmules and conidia? Name one organism each in which these are formed?                                                                           2

7. Name any two copper releasing IUDs. State how they act as a contraceptive.                                                                                                                                                                                                                                     2 

8. Why is it not possible to study the pattern of inheritance of traits in human beings, the same way as it is done in pea plant? Name the alternate method employed for such an analysis of human traits.                                                                                                                                                                                                                                                                                                                                                                                                             2 

9. Carefully examine structures A and B of pentose sugar given below. Which one of the two is more reactive? Give reasons.                                                                                                                                                             2


CBSE Class 12 Biology Sample Paper 2020 

For more questions in the Sample Paper for CBSE Class, 12 Biology is given subject wise in the PDF. Students are requested to prepare accordingly.

Download - CBSE Class 12 Biology Sample Paper 2020

                   CBSE Biology Marking Scheme 2020



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