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NEET Chapter PYQs with Solutions

733 previous year questions from Chapter (NEET UG Biology) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

733 questionsBiology2005–2026Answers + solutions

About Chapter PYQs

Chapter has 733 previous year questions in the Quantrex Academy NEET UG Biology bank. The 220 questions in this list come from NEET (220), spanning 2005 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

Questions by year (this list)

  • 2026: 218
  • 2014: 1
  • 2005: 1

Chapter questions with solutions

1

Consider the following three biomolecules: X: Uridine Y: Cytidylic acid Z: Guanine Choose the option that correctly categorizes X, Y, and Z.

NEET 2026 Solution View → 2

The complete, catalytically active enzyme together with its bound non-protein constituent is known as:

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During a laboratory experiment, a student accidentally boils a sample of salivary amylase before adding it to a starch solution. Which of the following best explains the most

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During a biological survey, a researcher discovers a new organism. To classify it properly, she examines its external and internal structure, cellular organization, developmental

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Given below are the stages in the sexual reproduction of higher fungi. Arrange the following stages in the correct sequence. A. Fusion of parental nuclei (Karyogamy) B. Meiosis in

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Read the given statements regarding the general characteristics of bryophytes and select the incorrect statement.

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Arrange the following male reproductive structures of gymnosperms in descending order of their physical hierarchy (macroscopic to microscopic). A. Microsporangium B. Microspore C.

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Which of the following sets of plants is correctly paired with the nature of its dominant plant body and the status of its vascular tissues?

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Members of class Chondrichthyes have to swim constantly to avoid sinking. This is primarily due to the:

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In a typical dicotyledonous seed, the distinct scar on the seed coat through which the developing seed was attached to the fruit is referred to as the:

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In which of the following plants can the flower be divided into two equal radial halves in any radial plane passing through the centre?

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Which of the following anatomical features is characteristic of the vascular bundles in a monocotyledonous stem?

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The small disc-shaped structures at the surface of the centromeres, which serve as the sites of attachment for spindle fibres during karyokinesis, are known as:

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In a bacterial cell, the plasma membrane often extends into the cytoplasm to form a specialised structure. These membranous extensions are typically found in the form of:

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Internode elongation just prior to flowering in plants with a rosette habit, such as cabbage and beet, is specifically promoted by the application of:

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During the electron transport system (ETS) in mitochondria, which of the following enzyme complexes contains cytochromes a and a_3 along with two copper centres?

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Carboxylation is considered the most crucial step of the Calvin cycle. Which of the following events specifically characterizes this stage?

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A botanist is studying microsporogenesis and microgametogenesis in an angiosperm species that sheds its pollen at the 3-celled stage. To generate exactly 100 such mature pollen

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In recent years, conservation strategies for threatened species have advanced significantly. Which of the following is considered an advanced method of ex-situ conservation?

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The 'Evil Quartet' describes the four major causes of biodiversity loss. Which of the following examples is incorrectly matched with its corresponding cause?

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Most ecosystems on Earth rely on a continuous and strictly unidirectional flow of solar energy. Which of the following statements correctly explains the necessity of this

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In Rana tigrina , which of the following external morphological features is exclusively present in males and helps in distinguishing them from females?

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In the anatomy of a frog's heart, the single ventricle opens into a specialized sac-like structure located on the ventral side. Identify this structure from the given options.

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During a "fight or flight" response, the adrenal medulla rapidly releases catecholamines into the bloodstream. Which of the following sets of physiological and metabolic changes

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Given below is a schematic representation of a mammalian nephron with certain parts labeled as A, B, C, and D. Select the correct statement regarding the physiological functions

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Mechanisms of breathing vary among different groups of animals depending mainly on their habitats and levels of organisation. Identify the incorrect match between the animal group

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In the human menstrual cycle, the remaining parts of the Graafian follicle transform into the corpus luteum during the :

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A couple is expecting monozygotic twins. Which of the following correctly represents the number of ova and sperms that participated in the fertilization process to form these

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According to the accepted principles of molecular biology, which of the following criteria must be fulfilled by a molecule to act as a suitable genetic material? (a) It should be

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One of the major observations derived from the Human Genome Project was regarding the proportion of DNA that actually translates into functional products. According to the salient

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The basic nature of histone proteins allows them to tightly pack the DNA helix. This property is due to the presence of positive charges on which specific part of their

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In a bacterial cell, if the σ (sigma) factor becomes non-functional, which specific event during transcription will be directly prevented?

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In a Mendelian dihybrid cross, a true-breeding pea plant with inflated green pods is crossed with a true-breeding plant having constricted yellow pods. The F_ 1 offspring are then

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Study the given pedigree chart showing the inheritance of a genetic disorder in a family. What is the probability that the first child (III-1) born to the couple II-2 and II-3

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Which of the following features accurately describes a typical antibody molecule?

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Observe the given list of lymphoid organs and tissues: Spleen, Thymus, Tonsils, Bone marrow, Peyer's patches, Appendix How many of these structures provide the micro-environments

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A human child is born with certain non-specific defense mechanisms that prevent the entry of pathogens. Which of the following represents a physical barrier of this innate immune

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Which of the following microbes are commercially exploited for the production of enzymes and bioactive molecules used specifically in medical therapies? A. Streptococcus B.

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During the artificial synthesis of human insulin by Eli Lilly, the A and B chains were produced separately and extracted. Which type of linkage was artificially created between

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In the development of transgenic tobacco plants resistant to the nematode Meloidogyne incognita , Agrobacterium vectors are used to introduce nematode-specific genes into the

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During the amplification of a gene of interest using PCR, a researcher sets the thermocycler for 5 continuous cycles. Assuming perfect efficiency, how many copies of the target

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Observe the schematic representation of the cloning vector pBR322 given below. If a foreign DNA fragment is successfully ligated at the PvuI restriction site, which of the

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Observe the given diagram of a specific type of bioreactor. Identify the correct statement regarding the component/feature labeled 'A'.

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A clown fish lives among the stinging tentacles of a sea anemone and gets protection from predators, while the anemone does not appear to derive any benefit nor is it harmed. This

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According to the principles of biological organisation, ecology at the organismic level is essentially:

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In a habitat with limited resources, a population exhibits Verhulst-Pearl logistic growth. The growth curve reaches an asymptote when:

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The division of Kingdom Fungi into various classes (such as Phycomycetes, Ascomycetes, etc.) is primarily based on which of the following sets of features?

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Observe the given figure illustrating a specific arrangement of floral parts on the thalamus. Identify the type of flower, the relative position of the ovary, and a correct

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At which stage of mitosis do the chromosomes reach their respective poles, decondense, and lose their individuality?

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Which of the following structural modifications in a simple triglyceride molecule leads to the formation of a compound lipid such as lecithin?

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A chemical compound 'X' closely resembles a normal substrate 'S' in its molecular structure. When 'X' is introduced into a biological system, it competes with 'S' for the

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Catalase and peroxidase are enzymes that catalyse the breakdown of hydrogen peroxide into water and oxygen. Which of the following acts as a tightly bound prosthetic group for

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In the given diagram of the outermost layers of a dicot stem, which labelled structure represents a typically multicellular epidermal appendage that helps in preventing water loss

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A mutant strain of E. coli is grown in a culture medium containing lactose as the sole carbon source. It is observed that lactose efficiently enters the bacterial cells, but the

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Observe the given diagram of a genetic cross and match the labels (P, Q, R, S) in List I with their correct genetic terms or values in List II. List I List II A Process P 1

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While analyzing a monohybrid cross between homozygous tall and dwarf pea plants, a student notes several genetic phenomena. Which of the following can be specifically explained on

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In Mirabilis jalapa , flower colour exhibits incomplete dominance. If a breeder wishes to obtain a progeny containing only pink and white flowers in a 1:1 phenotypic ratio, which

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In garden pea, violet flower colour (V) is dominant over white flower colour (v). A researcher wishes to determine the exact genotype of a plant bearing violet flowers. Which of

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During recombinant DNA procedures, the restriction endonuclease EcoRI is widely used to cut DNA molecules. Which of the following correctly represents the specific palindromic

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As per the records of the IUCN Red List, which of the following recently extinct species was native to Russia?

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Read the following events and identify which of them represent the components of the 'Evil Quartet' responsible for the loss of biodiversity: A. Extinction of Steller's sea cow

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Given below is a diagram showing four different types of placentation labeled A, B, C, and D. Match the figures in List I with their corresponding examples in List II. List I List

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Observe the given graph showing the concept of activation energy for a chemical reaction. Which of the following options correctly identifies the labels A, B, and C?

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Leucoplasts are colourless plastids of varied shapes and sizes that store different types of nutrients. Which of the following types of leucoplasts is specifically responsible for

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To prepare a weed-free lawn, gardeners extensively use a specific plant growth regulator that selectively kills dicotyledonous weeds but does not affect mature monocotyledonous

NEET 2026 Solution View → 66

During the continuous operation of the Krebs cycle, carbon is lost in the form of CO_2 . Which of the following intermediate conversions represents one of these decarboxylation

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Observe the given graph representing the species-area relationship proposed by Alexander von Humboldt. Match the labels (A, B, C, D) in List I with their correct descriptions or

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In a terrestrial ecosystem, the Gross Primary Productivity (GPP) of the producers is 20,000 kcal m^ -2 yr^ -1 . If the producers utilize 20\% of this energy for their own

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Observe the given diagrammatic representation of a specific muscle tissue. Identify the structure labeled 'X' and select the option that correctly pairs it with the primary

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Dog fish and Angel fish are respectively known as

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Observe the given diagram showing a specific stage of meiotic cell division. Match List I (relative stages of this division) with List II (characteristic features) based on the

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Given below are two cross-sectional diagrams labeled as Figure X and Figure Y, representing specific cell organelles. Match the items in List I with their corresponding

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Which of the following hormones acts principally on hepatocytes to stimulate both glycogenolysis and gluconeogenesis, thereby leading to hyperglycemia?

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Following is a list of structures through which a red blood cell passes as it travels from the right atrium to the systemic aorta: A. Bicuspid valve B. Aortic semilunar valve C.

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Observe the given spirogram where specific respiratory capacities and volumes are indicated by brackets labeled A, B, C, and D. Match the labels in List I with their corresponding

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The oxygen dissociation curve is a sigmoid curve that illustrates the relationship between the partial pressure of oxygen and the percentage saturation of haemoglobin. Under which

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Observe the given diagram of the human skeleton where four specific joints are labeled as A, B, C, and D. Match the labeled joints in List I with their corresponding types in List

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All of the following structures are included in the female external genitalia, except:

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During transcription, the sequence of the template strand of a transcription unit is given as: 5' - C G A T A G C C G T A T G C A - 3' Which of the following represents the

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Given below are some key features of different stages in human evolution. Arrange the hominids possessing these features in the correct chronological sequence of their appearance

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According to the Hardy-Weinberg principle, allele frequencies in a population are stable and remain constant from generation to generation. Which of the following conditions is

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In the E. coli cloning vector pBR322, the rop gene is responsible for:

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In a simple stirred-tank bioreactor, what is the primary function of its cylindrical shape or curved base?

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A foreign DNA fragment was ligated at the BamH I restriction site of the pBR322 cloning vector. The resulting recombinant plasmids were introduced into host E.\ coli cells. The

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Regarding the mechanism of competitive inhibition of an enzyme, arrange the following events in the correct logical sequence of cause and effect : A. The inhibitor competes with

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During a blood typing test, a man's blood sample shows agglutination with both anti-A and anti-B sera. He marries a woman whose blood shows no agglutination with either sera.

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Given below is a reference to a diagrammatic representation of the evolutionary history of vertebrates through geological periods. Match the labels A, B, C, and D in List I with

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According to the classification of pteridophytes, which of the following represents an incorrect match between the class and its corresponding example?

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In a typical angiospermic flower, the calyx, corolla, androecium, and gynoecium are successively arranged on the swollen terminal end of the pedicel. This swollen structure is

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Assertion (A) : In a monocotyledonous stem, the vascular bundles are surrounded by a sclerenchymatous bundle sheath. Reason (R) : The ground tissue in a monocotyledonous stem is

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Identify the key difference between Anaphase I and Anaphase II during meiotic cell division.

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Which of the following stages of prophase I is characterised by the terminalisation of chiasmata?

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Which plant growth regulator is widely recognized as a stress hormone because it stimulates the closure of stomata and increases plant tolerance to various environmental stresses?

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In agricultural and horticultural practices, which of the following plant growth regulators is extensively used to initiate rooting in stem cuttings and induce parthenocarpy in

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During secondary growth in dicotyledonous stems, the fully differentiated parenchymatous cells of medullary rays regain the capacity to divide and form the interfascicular

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Farmers often face the economic burden of purchasing hybrid seeds every year because the seeds collected from hybrid plants lose their hybrid vigour in subsequent generations due

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In 1953, S.L. Miller successfully simulated the conditions of primitive Earth in a laboratory setup to test the theory of chemical evolution. Which of the following was utilized

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According to the widely accepted scheme of cellular respiration, which of the following pathways serves as the only process of respiration in anaerobic organisms?

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To fix 5 molecules of CO_2 during the Calvin cycle, what is the total number of ATP and NADPH molecules consumed respectively?

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The leaf mesophyll cells of an angiosperm contain 24 chromosomes. What will be the number of chromosomes in the synergid, zygote, and primary endosperm nucleus (PEN) of this

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A plant species possesses well-exposed stamens, large feathery stigmas, and a single ovule in each ovary. The most likely agent of pollination for this plant is:

NEET 2026 Solution View → 102

In the methodology of the Human Genome Project, the blind approach of sequencing the whole set of genome that contained all the coding and non-coding sequences, and later

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In eukaryotes, the primary transcript that acts as a precursor of mRNA, known as heterogeneous nuclear RNA (hnRNA), is synthesized by which of the following enzymes?

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During the biochemical characterization of Griffith's transforming principle, it was observed that the transformation of non-virulent R strain bacteria into virulent S strain was

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Based on T.H. Morgan's experimental observations in Drosophila , which of the following statements correctly defines the term 'linkage'?

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A genetic disorder in humans is caused by a mutation in the gene that codes for the enzyme phenylalanine hydroxylase. This single gene mutation manifests in multiple phenotypic

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A mixture containing DNA fragments of sizes 150 bp , 450 bp , 900 bp , and 2500 bp is subjected to agarose gel electrophoresis. Which of these fragments will be found closest to

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In the process of isolating DNA for recombinant DNA technology, which of the following enzymes is specifically used to break open fungal cells?

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Which of the following techniques involves the direct introduction of recombinant DNA into the nucleus of an animal cell?

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A genetic engineer isolates an autonomously replicating, extrachromosomal genetic element from a bacterial cell to use as a cloning vector. Which of the following represents the

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The extinction of the Passenger pigeon and Steller's sea cow in the last 500 years is a classic example of biodiversity loss primarily due to:

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A considerable amount of gross primary productivity is utilized by plants for their own metabolic needs. The remaining biomass, which is available for consumption to heterotrophs

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Given below are some statements related to the process of decomposition in an ecosystem: A. Humification leads to the accumulation of a dark coloured amorphous substance which is

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What is the net outcome of the photorespiratory pathway in C_3 plants?

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During the light reaction of photosynthesis, the chemiosmotic hypothesis explains the mechanism of ATP synthesis. According to this hypothesis, what directly provides the energy

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Given below are the key steps involved in the isolation of genetic material from a fungal cell. Arrange these steps in the correct sequence. A. Addition of chilled ethanol to the

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Observe the ecological pyramid given below, which includes specific quantitative data for each trophic level. Which of the following ecosystems and parameters does this pyramid

NEET 2026 Solution View → 118

A physician using a stethoscope hears two prominent sounds during each cardiac cycle of a healthy individual. The second heart sound is produced primarily due to the:

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When an artificial electrical stimulus is applied to the middle of an axon, the action potential propagates in both directions along the membrane. However, at a chemical synapse

NEET 2026 Solution View → 120

After a normal expiration, a certain volume of air remains in the human lungs. Which of the following correctly represents this volume?

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Related NEET Biology chapters

Principles of Inheritance and Variation (58)Molecular Basis of Inheritance (54)Respiration in Plants (54)Sexual Reproduction in Flowering Plants (52)Evolution (47)Human Health and Diseases (47)Biomolecules (B) (45)Ecosystem (43)Transport in Plants (43)Human Reproduction (42)Breathing and Exchange of Gases (36)Plant - Growth and Development (35)