Option (B) is correct: Forensic science is formally defined as the application of scientific principles, methods, and techniques to matters of law and legal proceedings (criminal and civil).

Option (C) is correct: Dr. Edmond Locard (1877–1966) was a pioneering French criminologist and forensic scientist who established the first police crime laboratory in Lyon, France, and formulated Locard's Exchange Principle.

Option (B) is correct: The standard operational protocol for crime scene investigation is: (ii) Protection of the scene of crime (securing the perimeter) -> (iv) Sketching and photographing (documentation) -> (i) Collection of clue material -> (iii) Packing and labelling.

Option (A) is correct: Crime scene photography must record the scene and physical evidence in an unaltered condition before any item is moved, touched, or collected.

Option (C) is correct: Corroborative evidence is supplementary evidence that confirms, supports, or validates existing evidence or witness testimony.

Option (B) is correct (as the untrue statement): A class characteristic associates an item with a group or class, whereas individual characteristics uniquely identify a specific source to the exclusion of all others.

Option (B) is correct: Minimizing the number of individuals who physically handle the evidence directly minimizes contamination risk, cross-transfer, and evidence degradation.

Option (C) is correct: A primary pitfall in crime scene reconstruction is staged crime scenes, where perpetrators deliberately manipulate physical evidence to mislead investigators.

Option (C) is correct: Scales provide accurate dimensional reference for 1:1 photographic comparisons and demonstrate true object dimensions clearly in courtroom exhibits.

Option (C) is correct: A cryptographic hash function (e.g., MD5, SHA-256) takes variable-length input data and generates a unique fixed-length hash value; modifying even a single bit completely changes the hash value (avalanche effect).

Option (C) is correct: Mass Spectrometry (MS) breaks molecules into characteristic ionic fragments to produce a mass spectrum that serves as a definitive 'chemical fingerprint' for confirmatory drug identification.

Option (A) is correct: The Infrared (IR) spectrum, specifically the fingerprint region (1500–500 cm⁻¹), is uniquely characteristic of a compound's molecular structure, serving as a molecular fingerprint.

Option (C) is correct: In Selvi v. State of Karnataka (2010), the Supreme Court ruled that involuntary narco-analysis, polygraph, and brain fingerprinting violate Article 20(3) (protection against self-incrimination) and Article 21 (right to privacy and bodily integrity).

Option (A) is correct: Lenses with extreme ultra wide angles and focal lengths typically between 8 mm and 15 mm that produce strong hemispherical visual distortion are called fish-eye lenses.

Option (D) is correct: Atomic Absorption Spectroscopy (AAS) is an analytical technique specifically designed for quantitative determination of trace metallic elements (e.g., lead, antimony, arsenic, barium in gunshot residue and poisons).

Option (A) is correct: FTIR stands for Fourier Transform Infrared Spectroscopy, an analytical method utilizing mathematical Fourier transformation to convert raw interferogram data into an infrared spectrum.

Option (A) is correct: An Electroencephalograph is the physical instrument/device that records electrical brain activity (detecting the P300/MERMER brainwave response). The tracing itself is the electroencephalogram.

Option (D) is correct: Electrophoretic mobility is directly proportional to electric field strength and net charge, and inversely proportional to molecular size, frictional drag (shape), buffer viscosity, and ionic strength.

Option (C) is correct: The Refractive Index (RI) detector is called a universal detector in HPLC because it measures changes in the refractive index of the mobile phase and responds to nearly all solutes.

Option (D) is correct: The Retardation Factor (Rf) is a dimensionless ratio (distance moved by solute / distance moved by solvent front). Therefore, the absolute development distance cancels out and is the least critical factor compared to phase compositions and temperature.

Option (C) is correct: Birefringence is the optical property of anisotropic materials having a refractive index that depends on the polarization and propagation direction of light (numerical difference between extraordinary and ordinary rays: B = n_e - n_o).

Option (A) is correct: Microspectrophotometers (MSP) utilized in forensic trace evidence analysis of single fibers and microscopic paint chips combine a microscope with a UV-Visible spectrophotometer.

Option (C) is correct: Russian-Italian botanist Mikhail Tswett invented chromatography in 1900–1906 while separating plant pigments (chlorophylls and carotenoids) using a calcium carbonate column.

Option (B) is correct: Forensic entomologists determine the minimum Post-Mortem Interval (PMI) by analyzing the succession and developmental stages (instars) of necrophagous insects (such as blowfly Calliphoridae larvae).

Option (D) is correct: The chiru or Tibetan antelope (source of shahtoosh wool, heavily protected under CITES Appendix I and Wildlife Protection Act Schedule I) has the scientific name Pantholops hodgsonii.

Option (C) is correct: Mass Spectrometry (MS) coupled with chromatography (GC-MS or LC-MS) is the most versatile and definitive detector because it provides both quantification and unequivocal structural identification.

Option (D) is correct: Derivative spectrophotometry (first, second, or higher-order mathematical derivatives of absorbance with respect to wavelength) resolves overlapping absorption bands with very close λmax values.

Option (A) is correct: Beer-Lambert's Law states A = ε·b·c, where Absorbance (A) is directly and linearly proportional to solute concentration (c), producing a straight-line calibration curve with slope ε·b.

Option (A) is correct: LASER (Light Amplification by Stimulated Emission of Radiation) produces spatially and temporally coherent, monochromatic light where all photons are in phase (pulsating in unison).

Option (C) is correct: The Hot Stage Microscope (GRIM - Glass Refractive Index Measurement) precisely heats a calibrated silicone oil immersion medium until the glass particle's Becke line disappears at the match temperature.

Option (B) is correct: Dr. Lawrence A. Farwell patented and developed Brain Fingerprinting (Brain Electrical Oscillation Signature / P300-MERMER wave analysis) in the 1990s.

Option (B) is correct: In the electromagnetic spectrum, as wavelength increases from visible light (400–700 nm) to infrared, microwaves, and radio waves (meters to kilometers), frequency (ν = c/λ) and photon energy decrease.

Option (A) is correct: In a Polarized Light Microscope, the Polarizer is positioned below the stage (between light source and specimen), while the Analyzer is positioned above the objective lens.

Option (A) is correct: The universal defining foundation of all chromatographic separations is the differential distribution of analyte molecules between a stationary phase and a mobile phase.

Option (A) is correct: Gas Chromatography (GC) requires samples to be thermally stable and volatile at temperatures up to ~300–350°C to be carried by the carrier gas through the column.

Option (D) is correct: Pyrolysis-GC thermally degrades solid, non-volatile, insoluble polymeric materials—including paints, synthetic fibers, plastics, and rubbers—into characteristic volatile pyrolysates for GC analysis.

Option (B) is correct: A stereoscopic microscope offers low magnification (10x–125x), upright 3D viewing, and large working distance, making it ideal for micro-sorting and manual physical separation of trace evidence.

Option (D) is correct: According to de Broglie's hypothesis and Abbe's limit of resolution, high-velocity electron beams have wavelengths (~0.005 nm) thousands of times shorter than visible light photons (~400–700 nm), yielding vastly superior resolving power.

Option (C) is correct: Mass spectrometers separate and detect gas-phase ions based strictly on their mass-to-charge ratio (m/z) in magnetic, electrostatic, or quadrupole fields.

Option (D) is correct: In Neutron Activation Analysis (NAA), non-destructive trace element analysis is accomplished by bombarding the sample with thermal neutrons inside a nuclear reactor, creating radioactive isotopes that emit characteristic gamma rays.

Option (B) is correct: Thermal expansion reduces liquid density (dn/dT is negative, typically ~ -4×10⁻⁴ per °C for liquids and silicone oils), causing its refractive index to decrease.

Option (C) is correct: The DC Circuit Court in Frye v. United States (1923) established the landmark 'Frye standard' requiring that scientific evidence must have achieved general acceptance in its relevant scientific discipline to be admissible.

Option (A) is correct: Resolution (resolving power) is defined as the minimum distance between two points at which they can still be distinguished as separate entities.

Option (D) is correct: Xenon arc lamps emit continuous radiation across the ultraviolet and visible regions (200–800 nm), and photocells/photomultiplier tubes detect photons in the UV-Vis range.

Option (B) is correct: Electron Ionization (EI) mass spectrometry utilizes energetic electrons (typically 70 eV) to bombard volatilized analyte molecules, ionizing and fragmenting them.

Option (D) is correct: The parent peak represents the intact molecular ion (M⁺·), which corresponds to the unfragmented molecule that has lost a single electron and reveals the compound's nominal molecular weight.

Option (B) is correct: The optical comparison bridge combines the light paths from two separate compound microscope objectives into a single split-view ocular eyepiece.

Option (C) is correct: Secondary electrons are low-energy electrons ejected from conduction or valence bands of specimen atoms near the surface as a result of inelastic collisions with the primary incident electron beam.

Option (C) is correct: GC requires an oven to heat the column (often with programmed temperature ramps up to 300°C) to maintain analytes in the vapor phase, whereas HPLC operates primarily with liquid solvents at ambient or modest temperatures.

Option (D) is correct: Potentiometry is an electrochemical analytical technique (measuring cell potential under zero current), whereas colorimetry is an optical absorption technique (measuring light attenuation according to Beer's law).

Option (A) is correct: Meta-analysis is a quantitative, statistical technique that combines and synthesizes the findings and results from multiple independent scientific studies on the same topic.

Option (A) is correct: Karl Pearson's coefficient of correlation (Pearson's r) measures the statistical strength and direction of a linear relationship between two continuous variables.

Option (C) is correct: A fair coin has 2 equally likely outcomes (Head or Tail). The probability of obtaining a Head is 1/2, which in decimal form equals 0.5. Hence both statements (a) and (c) are correct.

Option (C) is correct: The Wildlife (Protection) Act, 1972 (Act No. 53 of 1972) was enacted by the Parliament of India on 9 September 1972 to provide protection to wild animal species and plants.

Option (D) is correct: India signed the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) in July 1976 and ratified it in October 1976.

Option (B) is correct: In wildlife tracking and census, Pugmark Length (PML) is defined as the maximum length from the tip of the farthest digit (toe) to the posterior base of the main pad along the walk line.

Option (C) is correct: The landmark NAS report concluded that physiological responses measured by polygraphs do not reliably correlate with deception, rendering polygraph evidence unscientific, unreliable, and biased.

Option (C) is correct: Dr. Robert Ernest House, a Texas obstetrician, pioneered the criminological use of scopolamine ('truth serum') in 1922 and is regarded as the father of narco-analysis.

Option (C) is correct: In polygraph examinations (such as CQT), irrelevant questions (e.g., 'Is your name X?') are completely neutral and serve to establish a baseline physiological response in a guilt-free, unstressed state.

Option (D) is correct: Standard forensic crime scene search patterns include strip/line search, spiral search (inward/outward), grid search, and quadrant/zone search.

Option (B) is correct: The Cytochrome b (Cyt b) gene in mitochondrial DNA has sufficient inter-species sequence divergence and conserved flanking primers, making it the universal marker for species identification in wildlife forensics.

Option (C) is correct: In forensic science, laboratory examination of physical evidence has two primary scientific objectives: identification of unknown substances and comparison of questioned items with known exemplars.

Option (A) is correct: Digital forensics strictly adheres to evidence integrity. Manipulating or altering digital data violates forensic ethics and the chain of custody; examiners must extract, interpret, and present evidence without altering it.

Option (B) is correct: Media forensics specifically focuses on analyzing static, dormant data stored on physical storage media (hard drives, optical discs, solid-state drives) as opposed to live volatile memory.

Option (C) is correct: The foundational best practice in digital forensics (ISO/IEC 27037) is never to examine or alter original digital media directly; examiners must first create a bit-stream forensic duplicate/image and verify its cryptographic hash.

Option (D) is correct: Digital evidence handling comprises rigorous documentation throughout the chain of custody, data recovery of deleted/hidden artifacts, and data reduction and extraction.

Option (D) is correct: Unlike traditional chemical or biological disciplines where unknown samples are calibrated against known chemical standards and reference controls, digital forensics relies on validation of algorithms, hash matches, and tool testing rather than physical control comparisons.

Option (A) is correct: The chronological development of chromatography is: (iii) Adsorption chromatography (Tswett, 1906) -> (ii) Partition chromatography (Martin & Synge, 1941) -> (iv) Gas chromatography (James & Martin, 1952) -> (i) Reverse phase chromatography (Howard & Martin, 1950s/1960s).

Option (D) is correct: David A. Garvin identified five fundamental approaches to defining quality: Transcendent, Product-based, User-based, Manufacturing-based, and Value-based. 'Minimum specification approach' is not one of Garvin's definitions.

Option (A) is correct: Under ISO/IEC 17000, accreditation is formally defined as 'third-party attestation related to a conformity assessment body conveying formal demonstration of its competence to carry out specific conformity assessment tasks'.

Option (B) is correct: Central Forensic Science Laboratory (CFSL), Kolkata became the first forensic laboratory in India to be accredited by NABL (under ISO/IEC 17025) in the year 2001.

Option (B) is correct: The National Accreditation Board for Testing and Calibration Laboratories (NABL) was established as an autonomous body under the aegis of the Department of Science and Technology (DST), Government of India (later placed under QCI).

Option (C) is correct: The International Organization for Standardization (ISO) first published the ISO 9000 series of quality management standards in 1987.

Option (A) is correct: The isoelectric point (pI) is defined as the specific pH of a solution at which a zwitterionic molecule (such as an amino acid or protein) carries zero net electrical charge.

Option (D) is correct: SDS denatures proteins and confers a uniform negative charge-to-mass ratio, allowing proteins in SDS-PAGE to be separated exclusively according to their molecular weight.

Option (D) is correct: Human seminal plasma is exceptionally rich in zinc, acid phosphatase, spermine, and choline, all of which are diagnostic forensic biochemical markers of seminal fluid.

Option (D) is correct: Normal human semen is slightly alkaline with a physiological pH typically ranging between 7.2 and 8.0 (standard reference 7.5–8.0), neutralizing the acidic vaginal environment.

Option (D) is correct: Christmas tree stain utilizes Nuclear Fast Red to stain spermatozoal heads bright red and Picroindigocarmine to stain acrosomal caps pink and tails/midpieces green-blue, providing definitive microscopic confirmation of human spermatozoa.

Option (A) is correct: PGM stands for Phosphoglucomutase, an important polymorphic glycolytic enzyme widely utilized as a genetic marker in forensic serology prior to DNA profiling.

Option (B) is correct: The benzidine catalytic test detects blood at dilutions up to 1:300,000 to 1:1,000,000 (extremely sensitive), but it is not specific because chemical oxidants and plant peroxidases produce false-positive reactions.

Option (C) is correct: Prolonged or excessive heating denatures the protein globin and degrades heme catalytic function, destroying the pseudoperoxidase activity used in presumptive blood tests.

Option (B) is correct: The Florence test is a microcrystalline presumptive test for seminal stains; Florence reagent (potassium triiodide) reacts with choline in seminal fluid to form rhombic, brown choline periodide crystals.

Option (B) is correct: The average shaft diameter of human scalp hair generally ranges between 50 and 120 µm (microns), falling squarely within the standard forensic range of 51–150 µm.

Option (A) is correct: In human adult males, total physiological circulating blood volume is approximately 70–75 ml/kg of body weight (averaging about 71 ml/kg body weight, representing roughly 5 liters in a 70 kg male).

Option (D) is correct: Diatoms are microscopic photosynthetic algae ubiquitously present across virtually all natural aquatic ecosystems, including freshwater lakes, ponds, rivers, streams, and oceans.

Option (A) is correct: Diatoms (class Bacillariophyceae) are single-celled, photosynthetic eukaryotic microscopic algae featuring rigid silica-based cell walls (frustules), used in forensic drowning diagnosis.

Option (B) is correct: Mature mammalian red blood cells and platelets lack nuclei and contain no nuclear DNA. Nuclear DNA in human blood is extracted specifically from nucleated White Blood Cells (leukocytes).

Option (C) is correct: According to Watson-Crick complementary base-pairing rules in double-stranded DNA, Adenine (A) always pairs with Thymine (T) via two hydrogen bonds, and Guanine (G) pairs with Cytosine (C) via three hydrogen bonds.

Option (C) is correct: Both the Amelogenin gene (which yields 106 bp and 112 bp amplicons on the X and Y chromosomes respectively) and Y-chromosome short tandem repeats (Y-STRs) are established genetic markers for forensic sex determination.

Option (B) is correct: CODIS stands for Combined DNA Index System, the automated DNA database and software system developed and maintained by the FBI for storing and matching forensic DNA profiles.

Option (A) is correct: A picogram (pg) is 10^-12 grams, which equals one trillionth of a gram (one millionth of a microgram).

Option (B) is correct: Mitochondrial DNA (mtDNA) exhibits strictly maternal inheritance in humans because the ovum contributes virtually all organelles and cytoplasm to the zygote, while sperm mitochondria are degraded.

Option (A) is correct: In the Landsteiner ABO blood group system, red blood cells of individuals with blood group AB possess both A and B antigens on their surface, and their serum contains neither anti-A nor anti-B antibodies.

Option (C) is correct: Salivary alpha-amylase (ptyalin) is present at extremely high concentrations in human saliva compared to other body fluids, making the amylase test (e.g., Phadebas test) the standard presumptive test for saliva stains.

Option (A) is correct: DNA molecules possess a net negative electrical charge at physiological pH due to the negatively charged ionized oxygen atoms in the repeating phosphate groups of its sugar-phosphate backbone.

Option (A) is correct: DNA is a chemically exceptionally stable macromolecule because of its 2'-deoxyribose sugar and stable double-helical structure stabilized by hydrogen bonding and base stacking, enabling recovery from ancient and degraded forensic remains.

Option (A) is correct: In earlier standard examination references and official syllabus benchmarks (ISBT classical categorization at the time of paper drafting), 26 human blood group systems were formally recognized and utilized in forensic testing.

Option (A) is correct: A human diploid somatic cell contains approximately 6 pg of genomic DNA. A haploid spermatozoon (sperm cell) contains half this amount, precisely ~3 to 3.3 picograms (pg) of DNA.

Option (C) is correct: While a human somatic cell contains only two copies of nuclear DNA, it contains hundreds to thousands of mitochondria, each containing multiple copies of mtDNA (yielding hundreds to thousands of copies per cell), making mtDNA indispensable for degraded forensic samples.

Option (C) is correct: Human hair medulla patterns are classified as continuous, interrupted, fragmented, or absent. 'Stacked' (ladder-like or multiserial stack) is characteristic of certain animals (e.g., rodents and rabbits), not human hair.

Option (B) is correct: Hair shafts contain keratinized cells lacking viable cell nuclei, making nuclear DNA profiling impossible without the root/follicular tag. However, abundant mitochondrial DNA (mtDNA) persists along the hair shaft and is routinely typed.

Option (B) is correct: Enamel is the hardest biological substance in the human body (composed of ~96% mineral hydroxyapatite). Dentine lies beneath the enamel, contains ~70% inorganic mineral and ~20% organic collagen, and is softer and more resilient than enamel.

Option (A) is correct: Human saliva contains alpha-amylase (specifically salivary amylase, or ptyalin), an endoamylase that cleaves internal alpha-1,4-glycosidic bonds in starch. Beta-amylase is present in plants and microbes, not humans.

Option (D) is correct: The human axial skeleton comprises 80 bones along the central longitudinal axis: skull (22), auditory ossicles (6), hyoid bone (1), vertebral column (26), and thoracic cage (24 ribs and 1 sternum).

Option (B) is correct: The adult human skeletal system consists of 206 distinct articulated bones (80 axial bones and 126 appendicular bones).

Option (C) is correct: In forensic anthropology, the greater sciatic notch of the os coxae is wide and shallow in females (typically measuring >56° to ~60°–90°), whereas in males it is narrow and deep (measuring <56°).

Option (C) is correct: There are exactly 7 cervical vertebrae (designated C1 to C7) in the neck region of the human vertebral column.

Option (D) is correct: Among the given options, the sacrum (part of the pelvic girdle) exhibits marked sexual dimorphism (e.g., sacral index, curvature, and breadth of base) making it a primary bone for sex determination in forensic anthropology.

Option (C) is correct: The appendicular skeleton consists of 126 bones: pectoral girdles (4), upper limbs (60), pelvic girdle (2), and lower limbs (60). (Total 126 + 80 axial = 206).

Option (B) is correct: The five sacral vertebrae begin fusing during adolescence and are completely united/ossified into a single sacrum by approximately 23–25 years of age (standard forensic benchmark: 23 years).

Option (D) is correct: The glenoid cavity (or glenoid fossa) is a shallow piriform articular surface located on the lateral angle of the scapula (shoulder blade), where it articulates with the head of the humerus.

Option (C) is correct: The sacrum is a large, triangular bone situated at the inferior base of the vertebral column between the two hip bones, formed by the fusion of five sacral vertebrae (S1–S5).

Option (D) is correct: The acetabulum is the deep cup-shaped socket on the lateral surface of the hip bone (formed by the ilium, ischium, and pubis) that articulates with the head of the femur to form the hip joint.

Option (D) is correct: The human sternum consists of three parts from superior to inferior: the manubrium, the body (mesosternum), and the xiphoid process (the smallest and lowest portion).

Option (B) is correct: The net negative charge on DNA is specifically imparted by the repeating phosphate groups (PO4^3-) in the phosphodiester bonds forming its sugar-phosphate backbone.

Option (C) is correct: There are exactly 12 thoracic vertebrae (T1 to T12) in the human vertebral column, each articulating with a pair of ribs.

Option (D) is correct: The human lumbar spine consists of 5 large, weight-bearing lumbar vertebrae designated L1 to L5.

Option (D) is correct: Individuals with blood group O (specifically O negative) have red blood cells devoid of A and B surface antigens, allowing their RBCs to be transfused to any ABO blood recipient without provoking ABO hemolytic reactions.

Option (A) is correct: Formalin (aqueous formaldehyde) induces methylene cross-linking between DNA and proteins and hydrolyzes phosphodiester backbones, severely inhibiting enzymatic PCR amplification and serological testing.

Option (C) is correct: In human immunohematology, the Rh factor refers specifically to the highly immunogenic RhD polypeptide antigen (Antigen D). Individuals possessing Antigen D are Rh-positive, while those lacking it are Rh-negative.

Option (A) is correct: Dr. Kary B. Mullis invented the Polymerase Chain Reaction (PCR) technique in 1983 while working at Cetus Corporation, for which he was awarded the Nobel Prize in Chemistry in 1993.

Option (C) is correct: Dr. Edmond Locard formulated the foundational forensic tenet 'Every contact leaves a trace' (Locard's Exchange Principle), published comprehensively in his 1928 treatise 'L'Enquête criminelle et les méthodes scientifiques'.

Option (A) is correct: In gymnosperms and angiosperms (seed-bearing spermatophytes), pollen grains represent the immature microgametophyte (male gametophyte) containing the sperm-producing cells.

Option (D) is correct: The Rhesus (Rh) blood factor was discovered between 1937 and 1940 by Karl Landsteiner and Alexander S. Wiener, and published formally in 1940.

Option (A) is correct: Kell was discovered in 1946 (Coombs et al.), Duffy in 1950 (Cutbush et al.), and Kidd in 1951 (Allen et al.)—all discovered during the post-WWII blood group discovery era spanning 1945–1965.

Option (D) is correct: Human Leukocyte Antigen (HLA) serological typing was developed by Jean Dausset, Jon van Rood, and Paul Terasaki in the 1960s and widely introduced into forensic disputed paternity resolution between 1965 and 1975.

Option (D) is correct: In isoelectric focusing (IEF), a stable, continuous pH gradient across the electric field is established using synthetic polyamino polycarboxylic acid buffers known as carrier ampholytes.

Option (C) is correct: The human circular mitochondrial genome (16,569 base pairs) encodes precisely 37 genes: 13 for respiratory chain polypeptides, 22 for transfer RNAs (tRNAs), and 2 for ribosomal RNAs (rRNAs).

Option (C) is correct: DNA fingerprinting (profiling) detects polymorphic sequence and length variations (such as VNTRs and STRs) in hypervariable non-coding regions to differentiate individual human beings.

Option (A) is correct: Dr. John Augustus Larson, a medical student and police officer in Berkeley, California, constructed the first modern practical polygraph instrument in 1920–1921 capable of simultaneously and continuously recording changes in blood pressure, pulse rate, respiration, and galvanic skin response.

Option (C) is correct: Sir Alec Jeffreys invented DNA fingerprinting in September 1984 at the University of Leicester, UK, demonstrating that hypervariable minisatellites could produce unique individual-specific genetic barcodes.

Option (C) is correct: Multiplexing (specifically multiplex PCR amplification) allows multiple distinct primer pairs targeting different genomic STR loci to be amplified and detected in a single reaction tube simultaneously.

Option (C) is correct: In sexual assault investigations, differential DNA extraction separates non-sperm female epithelial cells (lysed with mild detergent and proteinase K) from sperm cells (which require DTT to break disulfide bonds in sperm heads), yielding distinct female and male DNA fractions.

Option (C) is correct: Ganja, Bhang, and Charas (hashish) are direct preparations derived from Cannabis sativa/indica. Heroin (diacetylmorphine) is a semi-synthetic opioid derived from the opium poppy (Papaver somniferum), not cannabis.

Option (A) is correct: The catalytic Adler benzidine test for hemoglobin detection is exceptionally sensitive, capable of detecting blood dilutions ranging from 1:50,000 to over 1:1,000,000 in aqueous solutions.

Option (D) is correct: Recognized standard protocols for systematically searching crime scenes include the grid method, zone/sector method, spiral/circular method, and strip/line method.

Option (C) is correct: The stapes (stirrup) is the innermost of the three auditory ossicles in the middle ear and is the smallest and lightest bone in the human body (measuring ~3 x 2.5 mm and weighing ~3 mg).

Option (B) is correct: At any given moment, approximately 85–90% (benchmark 80–85%) of human scalp hair follicles are in the active growth phase, known as the anagen stage.

Option (B) is correct: When whole blood clots, fibrinogen is converted into insoluble fibrin meshwork entrapping cellular elements; the remaining clear, amber supernatant liquid devoid of clotting factors is termed serum.

Option (B) is correct: The Giese test is a specialized forensic biochemical test utilized for detecting perspiration/sweat stains by demonstrating urea and amino acids.

Option (A) is correct: Taq DNA polymerase is a thermostable enzyme isolated from the thermophilic bacterium Thermus aquaticus, originally discovered in Lower Geyser Basin hot springs of Yellowstone National Park.

Option (A/D) is correct: In forensic science and molecular biology standards, ultra-low temperature storage at -80°C in an ultra-deep freezer is the internationally recommended standard for long-term preservation of purified DNA and tissue banks without degradation.

Option (C) is correct: A saturated DMSO-salt solution (dimethyl sulfoxide, EDTA, and NaCl) is recognized as the best chemical preservative for room-temperature preservation of forensic soft tissue biopsies for DNA profiling when cold storage is unavailable.

Option (C) is correct: Palynology is the scientific study of plant pollen grains, spores, and other microscopic palynomorphs, utilized in forensic science to link suspects or objects to crime scenes.

Option (B) is correct: Restriction Fragment Length Polymorphism (RFLP) analysis relies directly on sequence-specific bacterial restriction endonucleases (such as HaeIII) to digest genomic DNA into fragments at specific restriction sites.

Option (A) is correct: Gunzberg's test (utilizing phloroglucinol and vanillin in ethanol) detects free hydrochloric acid (HCl), a distinctive chemical constituent of gastric juice, thereby identifying suspected vomit stains.

Option (D) is correct: Phosphoglucomutase (PGM), erythrocyte Acid Phosphatase (EAP/ACP), and Esterase D (EsD) are classic genetically polymorphic enzyme systems exhibiting multiple genetic variants, whereas spermine is a constant aliphatic polyamine metabolite lacking genetic polymorphism.

Option (B) is correct: A standard PCR cycle consists of three discrete temperature steps: (1) Denaturation (94–95°C, strands separate), (2) Annealing (50–65°C, synthetic sequence-specific oligonucleotide primers bind/hybridize to complementary target sequences), and (3) Extension (72°C, Taq polymerase synthesizes new strands).

Option (C) is correct: Semen contains flavins, aromatic amino acids, and choline conjugates that naturally fluoresce with a characteristic bright bluish-white luminescence when illuminated with ultraviolet or alternate light sources (ALS 365–415 nm).

Option (C) is correct: Normal human arterial blood is tightly maintained at a slightly alkaline physiological pH of approximately 7.35 to 7.45, with a standard textbook mean value of exactly 7.4.