GSEB Class 11 Solutions Unit 6 Read 2 Suspect Identification

Comprehension

Question 1. State whether true or false:
Answer:
(1) DNA analysis is highly accurate for suspect identification because it matches the blood groups of the suspects. - True
(2) Generating a DNA fingerprint is as straightforward as creating a general fingerprint. - False
(3) When investigators discover bite marks, these can be utilized to identify the criminals. - True
In simple words: This question assesses your understanding of basic facts about DNA analysis, its comparison to traditional methods, and the utility of specific types of physical evidence like bite marks in forensic investigations.

🎯 Exam Tip: When evaluating True/False statements, pay close attention to the specific claims made, as even partially incorrect reasoning can render an otherwise plausible statement false. Ensure you understand the underlying scientific principles.

Question 2. Here are some sentences. Decide whether they apply to DNA analysis. Write (Y) if they do and (N) if they don't.
Answer:
(1) DNA fingerprints are matched using suspects' dental records. (Y)
(2) Mud found on a suspect's shoes could be used for DNA analysis. (N)
(3) If two individuals are very similar to each other, they might share the same DNA. (N)
(4) A photocomposite image may assist in DNA analysis. (N)
In simple words: This question tests your knowledge of what evidence types are directly suitable for DNA analysis and how DNA specificity works. Dental records are for bite marks, not DNA matching; mud generally doesn't contain usable human DNA; and each person has unique DNA.

🎯 Exam Tip: Differentiate between direct DNA sources (like blood, saliva, hair) and other physical evidence (like dental records for bite marks or shoe prints) to correctly identify applications of DNA analysis versus other forensic techniques.

Question 3. Would you prefer the detection techniques used by characters like Father Brown or Byomkesh Bakshi or would you prefer new techniques like DNA analysis? Why? Discuss in class.
Answer: Modern forensic methods such as DNA analysis are preferable to traditional detection techniques employed by fictional characters like Father Brown or Byomkesh Bakshi. The reason is that newer techniques are inherently more scientific and offer greater reliability, being impervious to falsification. Older methods often relied heavily on assumptions, which could lead to errors, potentially resulting in the wrongful punishment of an innocent individual. DNA analysis, conversely, provides undeniable scientific facts, eliminating room for doubt or denial.
In simple words: Modern scientific techniques like DNA analysis are better than old, assumption-based methods because they are accurate, reliable, cannot be faked, and reduce the chance of wrongly accusing someone.

🎯 Exam Tip: When comparing traditional and modern methods, emphasize scientific accuracy, reliability, and the reduction of human error or bias as key advantages of advanced techniques like DNA analysis.

Question 4. Read the text carefully and list the various types of suspect identification methods mentioned there. Also write their small descriptions in the given table:
Answer:

🎯 Exam Tip: When describing methods, ensure clarity and conciseness. For tables, accurately map each method to its corresponding description, highlighting the key characteristic of each technique.

Question 5. Read the cases below and suggest methods that are best suited for suspect Identification.
Answer:
**Case 1:** A sum of two lakh rupees was stolen from Mr. Sharma's office. Police found no clues after a search. The night duty officer, who had been asleep, awoke when the thief dropped their bag while escaping, but the thief managed to flee. The most suitable method for this particular case is fingerprint analysis. As the thief handled the bag, they would have left fingerprints, which can be cross-referenced with police records for identification and apprehension.

**Case 2:** A family of four was murdered during the night. While investigating, half-eaten sandwiches were discovered in the kitchen, suggesting the criminals consumed food before leaving. A hockey stick was also found in the living room. Physical evidence is the most appropriate approach here. Bite marks from the half-eaten sandwiches can be collected and compared with dental records to identify the perpetrators.

**Case 3:** Eventually, investigators determined the shooter committed the crime from a nearby building's terrace. In their haste, the perpetrator left behind a partially empty water bottle and a used napkin. DNA fingerprinting is the ideal method for this scenario. Saliva traces can be collected from the half-empty bottle and the used napkin. Matching these traces with the criminal's DNA would greatly facilitate identification.
In simple words: For stolen money with a dropped bag, fingerprints are best. For murder with half-eaten food and a weapon, bite marks and physical evidence are key. For a shooter leaving a bottle and napkin, DNA from saliva is the most effective identification method.

🎯 Exam Tip: Analyze each case thoroughly to identify the most relevant piece of evidence and match it with the appropriate forensic technique. Justify your chosen method based on the specifics of the crime scene.

6. Answer the following questions in three to four sentences each:

Question 1. Name the various methods of suspect identification mentioned in the passage.
Answer: The passage outlines several methods for identifying suspects:
(i) DNA analysis.
(ii) Fingerprint examination.
(iii) DNA fingerprinting using biological samples such as blood, saliva, or hair.
(iv) Photocomposites.
(v) Physical evidence, including bite marks.
In simple words: The text mentions DNA analysis, fingerprints, DNA from blood/saliva/hair, photocomposites, and bite marks as ways to identify suspects.

🎯 Exam Tip: When listing methods, ensure you cover all distinct techniques mentioned in the passage, categorizing them clearly for a comprehensive answer.

Question 2. Which method is considered the most accurate in suspect Identification? Why?
Answer: In suspect identification, DNA analysis is regarded as the most accurate method. This is due to its unfalsifiable nature, as each individual possesses a unique DNA sequence. Every human cell contains thousands of DNA strands, enabling DNA fingerprinting to be performed using various biological evidence, such as blood, saliva, or hair.
In simple words: DNA analysis is the most accurate method for suspect identification because DNA is unique to each person, cannot be faked, and can be found in various body samples.

🎯 Exam Tip: Emphasize the uniqueness and unfalsifiable nature of DNA as the primary reasons for its superior accuracy, linking it to the scientific basis of identification.

Question 3. What kind of evidence from the site of crime would become useful for identifying the criminal?
Answer: Various types of evidence found at a crime scene can be valuable for identifying a criminal:
(i) Objects touched by the criminal, which could yield fingerprints, such as glasses, door handles, bags, or furniture.
(ii) Any leftover food consumed by the perpetrator.
(iii) Bloodstains, particularly in cases of murder or physical altercations.
(iv) Hair strands shed during a struggle.
(v) Saliva or vomit deposited at the crime scene.
(vi) Items left behind, such as a handkerchief or footwear, which may contain sweat traces.
In simple words: Useful crime scene evidence includes fingerprints on objects, leftover food, blood, hair, saliva, vomit, or items like handkerchiefs and footwear left behind.

🎯 Exam Tip: Provide a diverse list of evidence types, connecting each to how it can specifically help in identifying a criminal (e.g., fingerprints, DNA, dental records).

Question 4. What do you think, would be the advantages of using some of the scientific methods mentioned in the passage?
Answer: The scientific identification methods discussed in the passage offer significant benefits. Primarily, they are highly reliable and immune to falsification, unlike methods based on assumptions. Utilizing advanced technology, these methods ensure that evidence analyses are consistently accurate and beyond dispute. Secondly, their application reduces reliance on individual testimonies, thus preventing bias or partiality in identification, making the results genuinely trustworthy and dependable.
In simple words: Scientific methods are highly advantageous because they are foolproof, accurate, cannot be faked, and are not based on assumptions. They use advanced technology to provide reliable results without personal bias.

🎯 Exam Tip: Focus on the core benefits: accuracy, reliability, immunity to falsification, and reduction of human bias, as these are the main reasons scientific methods are preferred.

Reading Comprehension

Read the extract and answer the questions:

Question. (1) How does advanced technology help us to find DNA fingerprint?
(2) What are the other effective methods used in suspect Identification?
Answer:
(1) Advanced technology assists in DNA fingerprint identification by converting DNA profiles into barcode patterns on sheets, which law enforcement then uses for suspect matching.
(2) Other valuable methods for suspect identification include creating photo composites, especially with witness input, and utilizing physical evidence such as bite marks for dental record comparisons.
In simple words: Advanced technology helps find DNA fingerprints by creating barcode patterns for matching, and other methods include photo composites from witnesses and using bite marks from physical evidence.

🎯 Exam Tip: Break down multi-part questions into individual components. For each part, extract relevant information directly from the provided text to ensure accuracy and completeness.