CBSE Class 12 Biology (Theory) Previous Year Question Paper 2015 Set-1
This is the CBSE Class 12 Biology (Theory) Previous Year Question Paper from the 2015 Main Exams, Delhi Set-1. The paper is divided into five sections: Section A (Very Short Answer Type, 1 mark each), Section B (Short Answer Type I, 2 marks each), Section C (Short Answer Type II, 3 marks each), Section D (Value Based Question, 4 marks), and Section E (Long Answer Type, 5 marks each). All 26 questions are compulsory, with internal choices provided in one 2-mark question, one 3-mark question, and all three 5-mark questions. The total marks for the paper are 70, and the allotted time is 3 hours. Solving this authentic board question paper is crucial for students to understand the exam pattern, difficulty level, and important topics, thereby enhancing their preparation and performance in the final board examinations.
Quick info
| Board | CBSE |
|---|---|
| Class | 12 |
| Subject | Biology |
| Session | 2015 |
| Language | Hindi |
| Type | Previous Year Question Paper |
| Exam type | Board Exam |
Paper pattern
The question paper contains 26 questions divided into five sections (A, B, C, D, E) with a total of 70 marks and a duration of 3 hours.
Topics covered
Paper topics
- Genetics
- Inheritance
- Chromatin
- Transcription
- Industrial Melanism
- Pollution Indicators
- Diagnostic Practices
- X-rays
Important topics
- Variations and patterns of inheritance
- Transcriptionally active chromatin
- Industrial melanism and moths
- Risks of indiscriminate diagnostic practices
PDF preview
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Question paper text
SET - 1
Series: SSO/1
कोड नं.
Code No. 57/1/1
रोल नं.
परीक्षार्थी कोड को उत्तर-पुस्तिका के मुख-पृष्ट
पर अवश्य लिखें ।
Candidates must write the Code on
the title page of the answer-book.
Roll No.
कृपया जाँच कर लें कि इस प्रश्न-पत्र में मृद्रित पृष्ठ 8 हैं ।
प्रश्न-पत्र में दाहिने हाथ की ओर दिए गए कोड नम्बर को छात्र उत्तर-पुस्तिका के मुख-पृष्ट पर लिखें ।
कृपया जाँच कर लें कि इस प्रश्न-पत्र में 26 प्रश्न हैं।
कृपया प्रश्न का उत्तर लिखना शुरू करने से पहले, प्रश्न का क्रमांक अवश्य लिखें।
इस प्रश्न-पत्र को पढ़ने के लिए 15 मिनट का समय दिया गया है । प्रश्न-पत्र का वितरण पूर्वाहन में 10.15 बजे किया जायेगा । 10.15 बजे से 10.30 बजे तक छात्र केवल प्रश्न-पत्र को पढ़ेंगे और इस अवधि के दौरान वे उत्तर-पुस्तिका पर कोई उत्तर नहीं लिखेंगे ।
Please check that this question paper contains 8 printed pages.
Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate.
Please check that this question paper contains 26 questions.
Please write down the Serial Number of the question before attempting it.
15 minutes time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period.
जीव विज्ञान (सैद्धान्तिक)
BIOLOGY (Theory)
निर्धारित समय :3 घंटे ]
[ अधिकतम अंक :70
Time allowed: 3 hours ]
[ Maximum Marks : 70
सामान्य निर्देश:
(i) प्रश्न-पत्र में पाँच खण्डों में 26 प्रश्न दिए गए हैं । सभी प्रश्न अनिवार्य हैं ।
- खण्ड – क में प्रश्न संख्या 1 से 5 अति लघुत्तर प्रश्न हैं । प्रत्येक प्रश्न एक अंक का है ।
- खण्ड – ख में प्रश्न संख्या 6 से 10 लघुत्तर प्रश्न I प्रकार के हैं । प्रत्येक प्रश्न दो अंक का हैं ।
- खण्ड – ग में प्रश्न संख्या 11 से 22 लघुत्तर प्रश्न II प्रकार के हैं । प्रत्येक प्रश्न तीन अंक का हैं ।
- खण्ड – घ में प्रश्न संख्या 23 मूल्याधारित प्रश्न चार अंकों का हैं।
- खण्ड – ङ में प्रश्न संख्या 24 से 26 दीर्घ उत्तर प्रश्न हैं, प्रत्येक प्रश्न पाँच अंक का है ।
- प्रश्न-पत्र में कोई समग्र पर विकल्प नहीं है, फिर भी दो अंक के एक प्रश्न, तीन अंक के एक प्रश्न और पाँच अंकों के तीन प्रश्नों के भीतरी विकल्प दिए गए हैं । प्रत्येक परीक्षार्थी को ऐसे प्रश्नों के दो विकल्पों में से एक प्रश्न हल करना है ।
57/1/1 1 [P.T.O.
General Instructions:
- There are a total of 26 questions and five sections in the question paper. All questions are compulsory.
- Section A contains question number 1 to 5, Very Short Answer type questions of one mark each.
- Section B contains question number 6 to 10, Short Answer type I questions of two marks each.
- Section C contains question number 11 to 22, Short Answer type II questions of three marks each.
- Section D contains question number 23, Value Based Question of four marks.
- Section E contains question number 24 to 26, Long Answer type questions of five marks each.
- There is no overall choice in the question paper, however, an internal choice is provided in one question of two marks, one question 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.
खण्ड – क
SECTION - A
- जीवधारियों में पाए जाने वाली विविधताओं और वंशागित के प्रतिमानों के अध्ययन में दिलचस्पी रखने वाला एक आनुवंशिकीविद् अपने प्रयोगों के लिए ऐसे जीवों को वरीयता देता है जिनका जीवन-चक्र अपेक्षाकृत कम अविध में पूरा हो जाता है । कारण बताइए ।
1 A geneticist interested in studying variations and patterns of inheritance in living beings prefers to choose organisms for experiments with shorter life cycle. Provide a reason.
- केन्द्रक में क्रोमैटिन के अनुलेखन रूप से सिक्रय क्षेत्र का नाम बताइए ।
1 Name the transcriptionally active region of chromatin in a nucleus.
- इंग्लैंड में औद्योगिकीकरण काल के दौरान वृक्षों के तने पर पाए लाइकेनों की कमी होने के फलस्वरूप गहरे रंग के शलभों की समष्टि में वृद्धि हो जाने का कारण बताइए ।
1 State a reason for the increased population of dark coloured moths coinciding with the loss of lichens (on tree barks) during industrialization period in England.
- X-रे आदि का प्रयोग करते हुए बिना सोचे-विचारे की जाने वाली नैदानिक पद्धतियों से बचना चाहिए । कोई एक
कारण बताइए । 1
Indiscrimate diagnostic practices using X-rays etc., should be avoided. Give one reason.
57/1/1 2
Frequently asked questions
What is this document?
This is the CBSE Class 12 Biology (Theory) Previous Year Question Paper from the 2015 Main Exams, Delhi Set-1.
What is the structure of the Biology 2015 question paper?
The paper has 5 sections (A-E) with 26 questions in total, including very short, short, long answer, and value-based questions, carrying a total of 70 marks.
Are there any choices in the question paper?
Yes, internal choices are provided in one question of two marks, one question of three marks, and all three questions of five marks.
How does solving previous year papers help?
Solving previous year question papers helps students understand the board pattern, marking scheme, and important topics, improving their confidence and exam scores.
What is the time duration and maximum marks for the exam?
The exam is for a maximum of 70 marks and has a duration of 3 hours.
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