CBSE Class 12 Biology Previous Year Question Paper 2022 (57/5/3) - Set-3
This is the CBSE Class 12 Biology Board Question Paper for Term-II, conducted in 2022. With a total of 35 marks and a duration of 2 hours, this paper is an essential resource for students preparing for their board examinations. The question paper is divided into three sections: Section-A, Section-B, and Section-C. Section-A comprises 6 questions, each carrying 2 marks. Section-B contains 6 questions, each worth 3 marks. Section-C features a case-based question carrying 5 marks. While there is no overall choice, some questions offer internal choices, allowing students to attempt only one alternative. Neat and properly labelled diagrams are required where necessary. Solving this previous year's question paper will help students understand the exam pattern, question types, and marking scheme, thereby enhancing their preparation and boosting confidence for the final exams.
Quick info
| Board | CBSE |
|---|---|
| Class | 12 |
| Subject | Biology |
| Session | 2022 |
| Language | English |
| Type | Previous Year Question Paper |
| Exam type | Board Exam |
Paper pattern
The question paper contains 13 questions divided into three sections: Section-A (6 questions, 2 marks each), Section-B (6 questions, 3 marks each), and Section-C (1 case-based question, 5 marks). The total marks are 35 and the time allotted is 2 hours.
Topics covered
Paper topics
- Mycorrhizal association
- Glomus
- Cocaine
- Drug and alcohol abuse
- Sewage Treatment Plant
Important topics
- Mycorrhizal association
- Cocaine
- Drug and alcohol abuse
- Sewage Treatment Plant
PDF preview
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Question paper text
Question Paper Code
Date: 30/05/2022
57/5/3
Class-XII
Time: 2 hours
Max. Marks: 35
BIOLOGY (Theory)
Term-II (CBSE-2022)
GENERAL INSTRUCTIONS
Read the following instructions very carefully and strictly follow them:
- This question paper contains 13 questions. All questions are compulsory.
- This question paper has three sections – Section-A, B and C.
- Section – A has 6 questions of 2 marks each. Section–B has 6 questions of 3 marks each; and Section–C has a case-based question of 5 marks.
- There is no overall choice. However, internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions.
- Wherever necessary, neat and properly labelled diagrams should be drawn.
SECTION-A
- Many members of genus Glomus form a mycorrhizal association with plants. Elaborate how is this association
beneficial to the plants. [2]
Sol. Many members of genus Glomus form symbiotic association with plants and show several benefits to them such as
- It absorbs phosphorus from soil and passes it to the plant.
- Plants show resistance to root-borne pathogens
- Plants show tolerance to salinity and drought.
- Helps in overall increase in plant growth and development.
[2]
- (a) State the mode of action of cocaine on human body. Write the scientific name of the source plant it is
obtained from. [2]
OR
- Enumerate four most common warning signs of drug and alcohol abuse amongst the youth.
[2] Sol. (a) The mode of action of cocaine on human body is as follows: (any 2)
- It interferes with the transport of the neuro-transmitter dopamine.
- It has potent stimulating action on central nervous system, producing a sense of euphoria and increased energy.
- Excessive dosage of cocaine causes hallucinations.
Coca alkaloid or cocaine is obtained from coca plant Erythroxylum coca.
OR
- Four most common warning signs of drug and alcohol amongst the youth are as follows:
- Drop in academic performance along with unexplained absence from school/college.
- Lack of interest in personal hygiene, withdrawal, isolation, depression, fatigue, aggressive and rebellious behaviour may also be seen.
- Deteriorating relationships with family and friends and loss of interest in hobbies is also observed.
- Change in sleeping and eating habits, fluctuations in weight, appetite etc. is seen.
- If unable to get money to buy drugs/alcohol, he/she may turn to stealing.
- At times, a drug/alcohol addict becomes the cause of mental and financial distress to his/her entire family and friends.
- Study the given diagram of Sewage Treatment Plant (S.T.P) and answer the questions that follow: [2]
Municipal Sewage (W) (X) BIOLOGICAL SEDIMENTATION River
TREATMENT AND FILTRATION ******
S.T.P. (Sewage Treatment Plant) (A)
Municipal Sewage (Y) (Z) SEQUENTIAL BIOLOGICAL River
FILTRATION TREATMENT
S.T.P. (Sewage Treatment Plant) (B)
Frequently asked questions
What is this document?
This is a CBSE Class 12 Biology Previous Year Question Paper from the Term-II examination held in 2022 (Set-3).
What is the subject and class?
The subject is Biology for Class 12.
What is the total mark and duration?
The paper carries a maximum of 35 marks and the allotted time is 2 hours.
How does solving this paper help students?
Solving this previous year question paper helps students understand the exam pattern, question difficulty, and marking scheme, improving their preparation and confidence.
What is the structure of the paper?
The paper has three sections: Section-A (2 marks questions), Section-B (3 marks questions), and Section-C (a 5-mark case-based question).
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