Solving the previous years’ question papers to revise for the board exams is one of the most successful mantras followed by the topper students. Actually, solving the previous years’ papers is considered to the best tool to get familiar with the structure of the exam and know the type will come across a number of complex questions. When you will learn the right technique to answer such complex problems, you will become efficient to solve other related problems asked in your board exams.
In this article, we are providing the Rajasthan Board Class 12 Biology Solved Question Paper 2017. All the solutions provided here are explained in a way to help students easily understand the concepts/theories used, thus making the exam preparations easy and effective.
Key features of Rajasthan Board Class 12 Biology Solved Question Paper 2017 are
- Simple and easy solutions are provided for the questions
- Appropriate concepts/theories have been used in solutions
- Neat and clean diagrams are used wherever required
Structure of Rajasthan Board Class 12 Biology Paper 2017 is as per the following table:
| Part |
Question Nos. |
Marks Per Question |
| A |
1 – 13 |
1 |
| B |
14 – 24 |
2 |
| C |
25 – 27 |
3 |
| D |
28 – 30 |
4 |
Question number 24, 27, 28, 29 and 30 have internal choices.
A few sample questions and their solutions are given below:
Q. Write the importance of colostrum.
Ans.
During the first few days after delivery, the breasts produce colostrum. It is rich in protein and antibodies that provide passive immunity to the baby (the baby's immune system is not fully developed at birth). Colostrum also helps the newborn's digestive system to grow and function properly.
Q. What is transcription? What are the different parts of a DNA transcription unit? What is their role in the process of transcription?
Ans.
The process of copying genetic information from one strand of the DNA into RNA is called as transcription.
Different parts of a DNA transcription unit are:
(i) A promoter: Start site of transcription.
(ii) The structural gene: Expressed as RNA
(iii) A Terminator: End site of transcription.
Rajasthan Board Class 12 Biology Solved Question Paper 2018
Q. What is adaptation? Explain physiological adaptation taking an example of altitude illness.
Answer.
Adaptation: Any attribute of the organism (morphological, physiological, behavioural) that enables the organisms to survive and reproduce in its habitat is called adaptation.
Physiological Adaptation: At high altitude places we can experience Altitude sickness. Its symptoms include nausea, fatigue and heart palpitations. This is because in the low atmospheric pressure of high altitudes, body does not get enough oxygen. But gradually body gets acclimatised and stops experiencing altitude sickness. The body compensates low oxygen availability by increasing red blood cell production, decreasing the binding capacity of haemoglobin and by increasing breathing rate.
Q. What is the importance of biotechnology application in medicine? How does biotechnology help in the production of human insulin?
Ans.
Biotechnology application is very important in healthcare because it allows for the mass production of safe and more effective medicines. It also prevents undesirable immune responses which are common with medical products from non-human sources. Biotechnology can be helpful in the production of α-1-antitrypsin protein to treat emphysema, human insulin, human growth hormone etc.
Genetically Engineered Insulin:
Insulin consists of two short, polypeptide chains – chain A and B, linked via disulfide bridges. Insulin is produced as a ‘prohormone’ in mammals (including humans). This prohormone has an extra peptide, the C peptide, which needs to be removed to give rise to mature insulin.
In 1983, Eli Lilly an American company prepared two DNA sequences corresponding to A and B chains of human insulin. Chains A and B were produced separately, extracted and combined by creating disulfide bonds to form human insulin.
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The solved Biology question paper 2017 given here will offer a variety of problems to solve and give you the practice to code and know what kind of questions might be asked in the board exam 2019.
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