CBSE 12th Biology Sample Paper Term-2 : PDF Download

Safalta expert Published by: Yashaswi More Updated Wed, 02 Feb 2022 06:04 PM IST

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Check out the CBSE 12th Biology Sample Paper Term-2 in PDF Format and download whenever required here at Safalta.com

CBSE Biology Sample Paper with Answers and Marking Scheme has been released by the Central Board of Secondary Education. Check out the marking scheme and the sample paper in PDF format below. Also, learn about the CBSE 12th Biology Paper's paper pattern. Students can download the sample paper and answers in PDF format from the link at the bottom of this post. Join Safalta School Online and prepare for Board Exams under the guidance of our expert faculty. Our online school aims to help students prepare for Board Exams by ensuring that students have conceptual clarity in all the subjects and are able to score their maximum in the exams.

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In addition, you can check out this free Biology E-book set in English for all government exams- download now.

 

CBSE Term 2 Class 12 Biology Sample Paper 2021-22: Paper Pattern & Marking Scheme

 

The sample question paper consists of three sections and 13 questions. It is expected the paper would be similar. All the questions would be compulsory.

Section–A consists of 6 questions of 2 marks each.

Section–B would consist of 6 questions of 3 marks each.

Section–C consists of a case-based question of 5 marks.

This paper unlike other many has no overall choice.

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However, internal choices have been provided in some questions. A student can attempt only one of the alternatives in such questions.


Also Check-
To check the preparation tips for CBSE Class 12 English , click here.
To check the preparation tips for CBSE Class 12 Math , click here.


 

CBSE Term 2 Class 12 Biology Sample Paper 2021-22: Questions & Answers

 

Q.1 Humans have innate immunity for protection against pathogens that may enter the gut along with food. What are the two barriers that protect the body from such pathogens? 

Ans. Microbial pathogens enter the gut of humans along with food:

Physical barriers: Mucus coating of the epithelium lining the gastrointestinal tract helps in trapping microbes entering our body.

Physiological barriers: Acid in the stomach, saliva in the mouth prevent microbial growth.
 

Q.2 A patient admitted to ICU was diagnosed to have suffered from myocardial infarction. 

Name two bioactive agents and their mode of action that can improve this condition.

Ans.

Streptokinase (produced by the bacterium Streptococcus) is used as a ‘clot buster’ for removing clots from the blood vessels of patients who have undergone myocardial infarction. Statins (produced by the yeast Monascus purpureus) act as blood cholesterol-lowering agents. 
 

Q.3 Substantiate by giving two reasons as to why a holistic understanding of the flora and fauna of the cropland is required before introducing an appropriate biocontrol method.

Ans: Eradication of pests will disrupt predator-prey relationships, where beneficial predatory and parasitic insects which depend upon flora and fauna as food or hosts, may not be able to survive. A holistic approach ensures that various life forms that inhabit the field, their life cycles, patterns of feeding and the habitats that they prefer are extensively studied and considered.


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Best Books for CBSE Class 12 Science: Check the complete list of best books for CBSE Class 12 Board Exam
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Best Books for CBSE Class 12 Humanities: Check the complete list of best books for CBSE Class 12 Board Exam

 

Q.4 Identify the compound chemical structure is shown below. State any three of its physical properties

CBSE biology

Ans. It is Morphine. Physically it appears as a white, odourless, crystalline compound.
 

Q.5 An ecologist study an area with population A, thriving on unlimited resources and showing exponential growth, introduced populations B and C to the same area. What will be the effect on the growth pattern of the population A, B and C when living together in the same habitat? 

Ans. This interaction will lead to competition between the individuals of populations A, B and C for resources. Eventually, the ‘fittest’ individuals will survive and reproduce. The resources for growth will become finite and limiting, and population growth will become realistic.


Also Check-
CBSE Class 10 Model Papers for Term 1 Exam : Download In PDF

CBSE results delayed for TERM-1 EXAMS 2021-22

 

Check out more questions and answers below:

CBSE Sample Paper 2021-22- Biology| Download PDF

CBSE Sample Paper 2021-22 Biology Answers with Marking Scheme PDF


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