Q. What is the role of a capacitor in an AC circuit? (2023)
A.
Stores energy
B.
Dissipates energy
C.
Generates energy
D.
None of the above
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Solution
A capacitor stores energy in an AC circuit.
Correct Answer:
A
— Stores energy
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Q. What is the role of a diode in a rectifier circuit? (2022)
A.
To amplify signals
B.
To store charge
C.
To allow current in one direction
D.
To increase voltage
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Solution
In a rectifier circuit, a diode allows current to flow in one direction, converting AC to DC.
Correct Answer:
C
— To allow current in one direction
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Q. What is the role of a doping element in a semiconductor? (2020)
A.
To increase resistance
B.
To decrease temperature
C.
To change the conductivity
D.
To create a magnetic field
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Solution
Doping elements are added to semiconductors to change their conductivity by introducing additional charge carriers.
Correct Answer:
C
— To change the conductivity
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Q. What is the role of a Punnett square? (2023)
A.
To determine the phenotype of an organism
B.
To predict the genotypes of offspring
C.
To identify mutations
D.
To analyze genetic disorders
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Solution
A Punnett square is used to predict the genotypes of offspring from a genetic cross.
Correct Answer:
B
— To predict the genotypes of offspring
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Q. What is the role of a resistor in a semiconductor circuit? (2023)
A.
Increase current
B.
Limit current
C.
Store charge
D.
Amplify signal
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Solution
A resistor is used to limit the current flowing through a semiconductor circuit to prevent damage.
Correct Answer:
B
— Limit current
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Q. What is the role of a transformer in an AC circuit? (2023)
A.
To convert AC to DC
B.
To increase or decrease voltage
C.
To store energy
D.
To measure current
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Solution
A transformer is used to increase or decrease voltage in an AC circuit.
Correct Answer:
B
— To increase or decrease voltage
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Q. What is the role of Agrobacterium tumefaciens in biotechnology? (2021)
A.
Gene delivery
B.
Protein synthesis
C.
Cell division
D.
DNA replication
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Solution
Agrobacterium tumefaciens is used as a vector for gene delivery in plant biotechnology.
Correct Answer:
A
— Gene delivery
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Q. What is the role of Agrobacterium tumefaciens in genetic engineering? (2022)
A.
It acts as a vector
B.
It is a source of restriction enzymes
C.
It is used for DNA sequencing
D.
It helps in protein synthesis
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Solution
Agrobacterium tumefaciens is used as a vector to transfer genes into plant cells.
Correct Answer:
A
— It acts as a vector
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Q. What is the role of aldosterone in the body? (2021)
A.
Increase blood glucose
B.
Regulate sodium and potassium levels
C.
Stimulate milk production
D.
Enhance immune response
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Solution
Aldosterone is a hormone produced by the adrenal cortex that helps regulate sodium and potassium levels, thus influencing blood pressure.
Correct Answer:
B
— Regulate sodium and potassium levels
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Q. What is the role of an oxidizing agent in a redox reaction? (2020)
A.
It gains electrons
B.
It loses electrons
C.
It remains unchanged
D.
It increases the temperature
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Solution
An oxidizing agent gains electrons during a redox reaction, causing another species to be oxidized.
Correct Answer:
A
— It gains electrons
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Q. What is the role of biopesticides in agriculture? (2021)
A.
Increase soil fertility
B.
Control pest populations
C.
Enhance crop yield
D.
Improve water retention
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Solution
Biopesticides are used to control pest populations in an environmentally friendly manner, reducing the reliance on chemical pesticides.
Correct Answer:
B
— Control pest populations
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Q. What is the role of Bt toxin in genetically modified crops? (2022)
A.
Enhances growth rate
B.
Provides resistance to herbivores
C.
Increases photosynthesis
D.
Improves soil quality
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Solution
Bt toxin is produced by Bacillus thuringiensis and provides resistance to certain insect pests.
Correct Answer:
B
— Provides resistance to herbivores
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Q. What is the role of calcium ions in muscle contraction? (2022)
A.
To provide energy
B.
To bind to troponin
C.
To stimulate nerve impulses
D.
To form cross-bridges
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Solution
Calcium ions bind to troponin, causing a conformational change that allows myosin to bind to actin.
Correct Answer:
B
— To bind to troponin
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Q. What is the role of chlorophyll in leaves? (2023)
A.
Water storage
B.
Nutrient absorption
C.
Photosynthesis
D.
Gas exchange
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Solution
Chlorophyll is essential for photosynthesis as it captures light energy to convert carbon dioxide and water into glucose.
Correct Answer:
C
— Photosynthesis
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Q. What is the role of chloroplasts in plant cells? (2021)
A.
Respiration
B.
Photosynthesis
C.
Digestion
D.
Reproduction
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Solution
Chloroplasts are responsible for photosynthesis, converting light energy into chemical energy.
Correct Answer:
B
— Photosynthesis
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Q. What is the role of condoms in reproductive health? (2021)
A.
To enhance pleasure
B.
To prevent pregnancy and STIs
C.
To increase fertility
D.
To promote sexual activity
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Solution
Condoms are used to prevent both pregnancy and the transmission of sexually transmitted infections (STIs).
Correct Answer:
B
— To prevent pregnancy and STIs
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Q. What is the role of cyclins in the cell cycle? (2019)
A.
To inhibit cell division
B.
To promote apoptosis
C.
To regulate the cell cycle
D.
To repair DNA
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Solution
Cyclins are proteins that regulate the progression of the cell cycle by activating cyclin-dependent kinases (CDKs).
Correct Answer:
C
— To regulate the cell cycle
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Q. What is the role of dietary fiber in human health? (2021)
A.
Increase cholesterol
B.
Aid digestion
C.
Provide energy
D.
Enhance taste
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Solution
Dietary fiber aids digestion by promoting regular bowel movements and preventing constipation.
Correct Answer:
B
— Aid digestion
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Q. What is the role of DNA ligase in recombinant DNA technology? (2021)
A.
To cut DNA
B.
To join DNA fragments
C.
To replicate DNA
D.
To transcribe RNA
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Solution
DNA ligase is an enzyme that joins DNA fragments together, which is crucial for creating recombinant DNA molecules.
Correct Answer:
B
— To join DNA fragments
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Q. What is the role of DNA polymerase? (2021)
A.
Transcription
B.
Replication
C.
Translation
D.
Repair
Show solution
Solution
DNA polymerase is an enzyme that synthesizes new DNA strands during replication.
Correct Answer:
B
— Replication
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Q. What is the role of doping in semiconductors? (2022)
A.
To increase resistance
B.
To decrease conductivity
C.
To introduce charge carriers
D.
To create a magnetic field
Show solution
Solution
Doping introduces additional charge carriers (electrons or holes) into the semiconductor, enhancing its conductivity.
Correct Answer:
C
— To introduce charge carriers
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Q. What is the role of enzymes in the human body? (2021)
A.
Store energy
B.
Speed up chemical reactions
C.
Transport oxygen
D.
Regulate temperature
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Solution
Enzymes act as catalysts that speed up chemical reactions in the body, facilitating various metabolic processes.
Correct Answer:
B
— Speed up chemical reactions
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Q. What is the role of fossils in understanding evolution? (2020)
A.
They provide evidence of past life forms and their changes over time
B.
They are the only source of genetic information
C.
They show the exact lineage of species
D.
They have no role in evolution
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Solution
Fossils provide crucial evidence of past life forms and their changes over time, helping scientists understand the process of evolution and the history of life on Earth.
Correct Answer:
A
— They provide evidence of past life forms and their changes over time
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Q. What is the role of genetic drift in evolution? (1930)
A.
It increases genetic variation
B.
It leads to random changes in allele frequencies
C.
It promotes adaptation to the environment
D.
It is a form of natural selection
Show solution
Solution
Genetic drift is a mechanism of evolution that leads to random changes in allele frequencies in a population, particularly in small populations.
Correct Answer:
B
— It leads to random changes in allele frequencies
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Q. What is the role of genetically modified organisms (GMOs) in agriculture? (2022)
A.
Increase biodiversity
B.
Reduce crop yield
C.
Enhance resistance to pests
D.
Decrease nutritional value
Show solution
Solution
GMOs are engineered to enhance resistance to pests, thereby increasing crop yield.
Correct Answer:
C
— Enhance resistance to pests
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Q. What is the role of genetically modified organisms (GMOs) in food production? (2021)
A.
Increase in food safety
B.
Reduction of food waste
C.
Enhancement of food quality
D.
All of the above
Show solution
Solution
GMOs are designed to enhance food quality, safety, and reduce waste, thus all options are correct.
Correct Answer:
D
— All of the above
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Q. What is the role of glucagon in the body? (2021)
A.
Increase blood sugar levels
B.
Decrease blood sugar levels
C.
Stimulate growth
D.
Regulate metabolism
Show solution
Solution
Glucagon is a hormone produced by the pancreas that raises blood sugar levels by promoting the conversion of glycogen to glucose in the liver.
Correct Answer:
A
— Increase blood sugar levels
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Q. What is the role of helicase in DNA replication? (2022)
A.
To synthesize RNA
B.
To unwind the DNA double helix
C.
To join Okazaki fragments
D.
To add nucleotides
Show solution
Solution
Helicase unwinds the DNA double helix during DNA replication.
Correct Answer:
B
— To unwind the DNA double helix
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Q. What is the role of hemoglobin in respiration? (2019)
A.
Transporting oxygen
B.
Filtering air
C.
Regulating pH
D.
Producing carbon dioxide
Show solution
Solution
Hemoglobin in red blood cells binds to oxygen in the lungs and transports it to tissues throughout the body.
Correct Answer:
A
— Transporting oxygen
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Q. What is the role of iron in plants? (2022)
A.
Oxygen transport
B.
Chlorophyll synthesis
C.
Water uptake
D.
Sugar transport
Show solution
Solution
Iron is essential for chlorophyll synthesis and plays a role in various enzymatic reactions.
Correct Answer:
B
— Chlorophyll synthesis
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NEET MCQ & Objective Questions
The National Eligibility cum Entrance Test (NEET) is a crucial examination for aspiring medical students in India. Scoring well in NEET can open doors to prestigious medical colleges, making it essential for students to prepare effectively. Practicing NEET MCQs and objective questions not only enhances understanding but also boosts confidence, ensuring you are well-prepared for the exam. Engaging with practice questions helps identify important topics and improves your ability to tackle various question formats.
What You Will Practise Here
Human Anatomy and Physiology
Biochemistry and Molecular Biology
Genetics and Evolution
Plant and Animal Physiology
Ecology and Environment
Physics Concepts Relevant to Biology
Important NEET questions on Chemical Bonding and Reactions
Exam Relevance
NEET is aligned with the syllabus of CBSE and various State Boards, ensuring that the topics covered are relevant for both school exams and competitive tests like JEE. Common question patterns include multiple-choice questions that assess conceptual understanding and application of knowledge. By focusing on NEET objective questions, students can familiarize themselves with the exam format and improve their time management skills during the actual test.
Common Mistakes Students Make
Misinterpreting questions due to lack of careful reading.
Overlooking the importance of diagrams and visual aids in biology.
Neglecting to review basic concepts that are foundational for advanced topics.
Confusing similar terms and definitions, especially in biochemistry.
FAQs
Question: How can I improve my NEET MCQ solving skills?Answer: Regular practice with NEET MCQ questions and reviewing explanations for both correct and incorrect answers can significantly enhance your skills.
Question: Are there specific topics I should focus on for NEET preparation?Answer: Yes, focus on high-weightage topics like Human Physiology, Genetics, and Ecology, as they frequently appear in exams.
Start your journey towards success by solving NEET practice MCQs today! Test your understanding, identify your strengths and weaknesses, and prepare effectively for your upcoming exams.
