Can a disease be detected before its sym | Class 12 Biology Chapter Biotechnology and its Application, Biotechnology and its Application NCERT Solutions

Current NCERT chapter

Academic session 2026-27, Chapter 10 in the current curriculum.

Welcome to the NCERT Solutions for Class 12 Biology - Chapter Biotechnology and its Application. This page offers a step-by-step solution to the specific question from Exercise 0, Question 5:

Can a disease be detected before its symptoms appear? Explain the principle involved.

. With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 5:

Can a disease be detected before its symptoms appear? Explain the principle involved.

Answer:

DNA technology helps in to identify the individuals with genetic disorders before the appearance of symptoms. All diseases involves the changes in gene expression in the affected cell. Presence of pathogens are suspected when they are in high concentration, which produced disease symptom but when they are in low concentration, this can be detected by amplification of their nucleic acid by the PCR. Like in the PCR (polymerase chain reaction) is used to amplify the nucleic acid (single copy of DNA into multiple) without using cells. When the source of DNA is impure, can be amplified by PCR technique. And when the sequence of HIV DNA is known, PCR will help in the detection of HIV DNA in the blood or the tissues.  

Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

  • Read the question carefully and focus on the core concept being asked.
  • Reference examples and data from the chapter when answering questions about Biotechnology and its Application.
  • Review previous year question papers to get an idea of how such questions may be framed in exams.
  • Practice answering questions within the time limit to improve your speed and accuracy.
  • Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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Welcome to the NCERT Solutions for Class 12 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 5: Can a disease be detected before its symptoms appear? Explain the principle involved.....

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