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Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6]
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Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] Answer: B Explanation: SPR detects alterations in light refraction caused by collective electron oscillations at the metal-dielectric interface when a target binds. Question 4. A major advantage of using gold nanoparticle-based colorimetric assays for plant disease detection is: A) Requirement of sophisticated spectrophotometers B) Visible color change that can be interpreted by the naked eye C) Need for high-temperature incubation steps D) Inability to detect low-concentration analytes Answer: B Explanation: Gold nanoparticles exhibit size-dependent color shifts, allowing simple visual read-outs without instrumentation. Question 5. Which gas is most commonly monitored by nanomaterial-based gas sensors to assess fertilizer-derived ammonia emissions in fields? A) Carbon dioxide (CO )₂ B) Nitrogen dioxide (NO )₂ C) Ammonia (NH )₃ D) Methane (CH )₄ Answer: C Explanation: Ammonia is a direct volatilization product of nitrogenous fertilizers; its detection helps manage nitrogen use efficiency. Question 6. The electronic nose (e-nose) technology primarily relies on which detection mechanism for volatile organic compounds (VOCs) emitted by stressed crops?
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] A) Mass spectrometry B) Conductivity change of metal-oxide semiconductors C) Radioactive decay measurement D) Thermal imaging Answer: B Explanation: Metal-oxide semiconductor arrays change resistance when VOCs adsorb, forming the basis of e-nose pattern recognition. Question 7. In the context of climate-smart organic agriculture, biosensors contribute to carbon sequestration verification by: A) Measuring soil bulk density B) Quantifying soil organic carbon content through electrochemical oxidation signals C) Recording ambient temperature fluctuations D) Detecting pesticide residues Answer: B Explanation: Electrochemical sensors can assess redox-active carbon compounds, providing data for carbon stock assessments. Question 8. Which nanocomposite is frequently integrated into flexible biosensor patches for real-time monitoring of plant hormone ethylene? A) Polyaniline/graphene oxide B) Silver nanowire/PDMS C) TiO /PMMA₂ D) Calcium carbonate/PLA Answer: B
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] B) Electrochemical impedance spectroscopy (EIS) C) Fluorescence microscopy D) Thermal gravimetric analysis Answer: B Explanation: EIS detects minute changes in charge transfer resistance when mycotoxins bind to immobilized antibodies, enabling quick field assays. Question 12. In lateral flow assays (LFAs) for food authentication, the test line typically contains: A) A magnetic bead cluster B) An immobilized capture antibody or antigen specific to the target C) A pH-sensitive dye D) A temperature sensor Answer: B Explanation: The capture reagent on the test line binds the target, producing a visible colored line. Question 13. Which of the following is a key challenge when deploying nanobiosensors for pathogen detection in open field conditions? A) Excessive power consumption B) Interference from soil moisture and organic matter C) Lack of available nanomaterials D) Inability to detect DNA sequences Answer: B Explanation: Soil matrix components can impede analyte diffusion and cause nonspecific signals, affecting sensor accuracy.
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] Question 14. The term “point-of-care” in plant disease diagnostics most closely refers to: A) Laboratory-based polymerase chain reaction (PCR) analysis B) On-farm, immediate visual or instrumental read-out without centralized facilities C) Satellite-based remote sensing of canopy health D) Post-harvest laboratory testing of produce Answer: B Explanation: Point-of-care devices deliver rapid results directly in the field, enabling timely management decisions. Question 15. Which nanomaterial property is primarily exploited in quantum dot-based fluorescence biosensors for detecting fungal spores? A) High electrical conductivity B) Size-tunable emission wavelengths C) Magnetic susceptibility D) Thermal stability Answer: B Explanation: Quantum dots emit distinct colors depending on particle size, allowing multiplexed detection of different fungal markers. Question 16. In smart aquaculture, dissolved oxygen (DO) sensors commonly employ which transduction principle? A) Optical fluorescence quenching B) Electrochemical amperometry using a Clark-type electrode C) Piezoelectric resonance shift
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] Question 19. The primary function of a reference electrode in an electrochemical biosensor for soil nitrate detection is to: A) Catalyze nitrate reduction B) Maintain a stable potential against which the working electrode’s signal is measured C) Emit light for optical read-out D) Store nitrate ions for later analysis Answer: B Explanation: The reference electrode provides a constant potential, allowing accurate measurement of current changes at the working electrode. Question 20. Which analytical technique is often combined with nanobiosensors to achieve multiplexed detection of several pesticide residues simultaneously? A) Gas chromatography-mass spectrometry (GC-MS) B) Surface-enhanced Raman scattering (SERS) on nanostructured substrates C) Nuclear magnetic resonance (NMR) spectroscopy D) Infrared thermography Answer: B Explanation: SERS amplifies Raman signals of multiple analytes adsorbed on nanostructured metallic surfaces, enabling parallel detection. Question 21. In the context of biosensor evolution, the transition from conventional laboratory instruments to IoT-enabled nodes primarily addresses which limitation? A) Low analytical specificity B) Lack of data connectivity and real-time monitoring
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] C. High cost of nanomaterials D. Inability to detect gases Answer: B Explanation: IoT nodes transmit data instantly to cloud platforms, facilitating continuous field monitoring and decision support. Question 22. Which of the following nanostructures is most suitable for constructing a flexible, wearable sensor that monitors plant leaf moisture? A) Rigid silicon wafers B. Conductive polymer nanofibers embedded in elastomeric substrates C. Bulk copper plates D. Glass microspheres Answer: B Explanation: Conductive polymer nanofibers maintain electrical functionality while conforming to leaf curvature. Question 23. The detection limit of a biosensor for aflatoxin B1 in corn is typically expressed in: A) Parts per million (ppm) B) Parts per billion (ppb) C) Millimoles per liter (mM) D. Microliters per gram (μL/g) Answer: B Explanation: Aflatoxin regulations are set at ppb levels; sensors must achieve comparable sensitivity.
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] D. Strong magnetic response Answer: B Explanation: Sensors must retain structural and functional integrity at elevated temperatures; thermally stable nanomaterials meet this requirement. Question 27. The primary benefit of using a dual-recognition (enzyme + antibody) biosensor for pesticide detection is: A. Reduced production cost B. Simultaneous measurement of two unrelated analytes C. Enhanced selectivity and lower false-positive rates D. Ability to operate without power Answer: C Explanation: Combining two distinct biorecognition layers provides a verification step, improving specificity. Question 28. Which parameter is most directly measured by a nanobiosensor using amperometric transduction for soil potassium (K ) monitoring?⁺ A. pH shift B. Current generated by oxidation/reduction of K ⁺at the electrode surface C. Optical absorbance change D. Acoustic wave velocity Answer: B Explanation: Amperometric sensors record current proportional to ion flux during electrochemical reactions. Question 29. When integrating nanobiosensors into a precision-irrigation system, the sensor data most commonly triggers:
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] A. Automatic pesticide spraying B. Adjustments in irrigation schedule based on real-time soil moisture and nutrient status C. Harvest time prediction only D. Drone flight paths for pollination Answer: B Explanation: Real-time moisture and nutrient readings inform precise water delivery, conserving resources. Question 30. In the detection of insect pathogens on beneficial pollinators, a rapid diagnostic biosensor typically employs which type of recognition element? A. Synthetic polymer matrix B. Phage-displayed antibody fragments (scFv) C. Metallic foil D. Carbon black powder Answer: B Explanation: scFv fragments can be engineered for high affinity to specific insect pathogens and are amenable to sensor integration. Question 31. Which of the following best describes the role of a “smart” biosensor in organic farming certification? A. It replaces all manual soil testing required by certification bodies B. It provides traceable, real-time data on soil health and input usage to support compliance claims C. It automatically generates organic labels without farmer input D. It eliminates the need for crop rotation Answer: B
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] B. Using satellite imagery to locate pests C. Storing data on cloud servers only D. Sending data only after a full season of monitoring Answer: A Explanation: Edge computing reduces latency and bandwidth by processing data locally, enabling rapid pest alerts. Question 35. The main limitation of using DNA aptamers as biorecognition elements in field-deployed agricultural biosensors is: A. Their inability to bind small molecules B. Susceptibility to degradation by nucleases present in soil and water C. Requirement for high-temperature operation D. Lack of specificity Answer: B Explanation: Environmental nucleases can cleave aptamers, reducing sensor lifespan unless protected. Question 36. Which analytical signal is generated by a nanobiosensor employing a quartz crystal microbalance (QCM) for detecting fungal spores? A. Frequency shift due to mass loading on the crystal surface B. Voltage change across the crystal C. Color change of a dye layer D. Magnetic field variation Answer: A Explanation: QCM measures the decrease in resonant frequency proportional to the mass of bound spores.
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] Question 37. In a biosensor for detecting nitrate in irrigation water, the use of a nanostructured titanium dioxide (TiO ) electrode primarily enhances:₂ A. Light absorption for photo-electrochemical detection B. Magnetic attraction of nitrate ions C. Thermal conductivity of the sensor D. Mechanical rigidity only Answer: A Explanation: TiO ₂can act as a photoactive material, generating electrons upon illumination that participate in nitrate reduction detection. Question 38. Which of the following best explains why point-of-care colorimetric assays using gold nanoparticles are considered “label-free” for pathogen detection? A. They do not require any antibodies or enzymes B. The color change originates from the intrinsic plasmonic property of AuNPs upon aggregation induced by target binding C. They rely on radioisotope labeling D. They need external fluorescence tags Answer: B Explanation: Aggregation of AuNPs changes the plasmon resonance, producing a visible color shift without additional labels. Question 39. A key advantage of integrating nanobiosensors with machine-learning algorithms in precision agriculture is: A. Elimination of all hardware components
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] Answer: B Explanation: Biodegradable fibers break down naturally, aligning with sustainability goals for food packaging. Question 42. In a smart livestock health monitoring system, a nanobiosensor that tracks cortisol levels in saliva primarily indicates: A. Nutrient deficiency B. Acute stress or disease state in the animal C. Reproductive cycle stage D. Bone density Answer: B Explanation: Elevated cortisol is a biomarker of physiological stress, useful for early disease detection. Question 43. Which nanomaterial property is exploited in a magnetic bead-based biosensor for rapid separation of bacterial pathogens from milk samples? A. Electrical conductivity B. Superparamagnetism allowing external magnetic field-driven capture C. Optical transparency D. Thermal expansion Answer: B Explanation: Superparamagnetic beads bind target bacteria and can be quickly isolated using a magnet, streamlining sample preparation.
Namdeo PudakeUtkarsh JainChittaranjan Kole [ISBN : 978 3 030 66165 6] Question 44. The detection of which plant hormone is most commonly achieved using a nanobiosensor based on a field-effect transistor (FET) for monitoring fruit ripening? A. Gibberellin B. Auxin C. Ethylene D. Cytokinin Answer: C Explanation: Ethylene is a gaseous ripening hormone; FET sensors can detect its adsorption-induced charge changes. Question 45. In a nanobiosensor designed for detecting heavy metals (e.g., Cd² ) in irrigation water, the use of a DNAzyme as the recognition element⁺ provides: A. Photoluminescence without any target binding B. Catalytic cleavage of a substrate only in the presence of the specific metal ion, generating a measurable signal C. Magnetic resonance imaging contrast D. Thermal conductivity changes Answer: B Explanation: Metal-dependent DNAzymes undergo cleavage reactions when the target ion is present, producing a detectable output. Question 46. Which of the following best describes the “limit of detection” (LOD) for a nanobiosensor? A. The maximum concentration the sensor can measure accurately
