NEET 2021
Paper was held on Sun, Sep 12, 2021 4:30 AM
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Biology

Which of the following is an incorrect statement?
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The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during polli
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The factor that leads to Founder effect in a population is :
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The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram c
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Diadelphous stamens are found in
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Gemmae are present in
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A typical angiosperm embryo sac at maturity is :
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Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survi
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During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out :
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DNA strands on a gel stained with ethidium bromide when viewed under UV radiation, appear as
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Which of the following algae produce Carrageen?
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Plants follow different pathways in response to environment of phases of life to form different kinds of structures. Thi
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The site of perception of light in plants during photoperiodism is
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The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is refe
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Match List-I with List-II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli
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Which of the following stages of meiosis involves division of centromere?
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The first stable product of CO2 fixation in Sorghum is
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Which of the following statements is not correct?
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Which of the following algae contains mannitol as reverse food material?
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When gene targetting involving gene amplification is attempted in an individual's tissue to treat disease, it is known a
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Match List-I with List-II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli
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Match List-I with List-II . .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:sol
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Complete the flow chart on central dogma.
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In the equation GPP - R = NPPR represents :
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When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as :
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The plant hormone used to destroy weeds in a field
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Which of the following are not secondary metabolites in plants?
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Amensalism can be represented as :
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Which of the following is not an application of PCR (Polymerase Chain Reaction)?
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Which of the following is a correct sequence of steps in a PCR (Polymerase Chain Reaction)?
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Match List-I with List-II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli
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Which of the following statements is correct?
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In the exponential growth equation Nt = N0ert, e represents
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In some members of which of the following pairs of families, pollen grains retain their viability for months after relea
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Match List-I with List-II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli
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Match List-I with List-II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli
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Match Column-I with Column-II Select the correct answer from the options given below.
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What is the role of RNA polymerase III in the process of transcription in eukaryotes?
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Which of the following statements is incorrect?
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Now-a-days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its compl
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DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as
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Which of the following statements is incorrect?
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Plasmid pBR322 has Pst I restriction enzyme site within gene ampR that confers ampicillin resistance. If this enzyme is
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Identify the correct statement.
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Select the correct pair.
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Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid
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Receptors for sperm binding in mammals are present on :
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The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G1 phase
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Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.
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Match the following : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;bor
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Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?
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If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?
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The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are :
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Read the following statements(1) Metagenesis is observed in Helminths.(2) Echinoderms are triploblastic and coelomate an
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In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny wil
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Which of the following statements wrongly represents the nature of smooth muscle?
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Which one of the following belongs to the family Muscidae?
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During the process of gene amplification using PCR, if very high temperature is not maintained in the beginning, then wh
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Match List-I with List-II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli
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Which one of the following is an example of Hormone releasing IUD?
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The centriole undergoes duplication during :
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Which of the following characteristics is incorrect with respect to cockroach?
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Veneral diseases can spread through :(1) Using sterile needles(2) Transfusion of blood from infected person(3) Infector
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Which one of the following organisms bears hollow and pneumatic long bones?
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Persons with 'AB' blood group are called as "Universal recipients". This is due to :
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The organelles that are included in the endomembrane system are
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A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is :
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Identify the incorrect pair
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With regard to insulin choose correct options.(1) C-peptide is not present in mature insulin.(2) The insulin produced by
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Chronic auto immune disorder affecting neuro muscular junction leading to fatigue, weakening and paralysis of skeletal m
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Which of the following RNAs is not required for the synthesis of protein?
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Erythropoietin hormone which stimulates R.B.C formation is produced by :
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Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?
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For effective treatment of the disease, early diagnosis and understanding its pathophysiology is very important. Which o
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Which is the "Only enzyme" that has "Capability" to catalyse Initiation, Elongation and Termination in the process of tr
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Match List-I with List-II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli
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Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid
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Following are the statements with reference to 'lipids'.(1) Lipids having only single bonds are called unsaturated fatty
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Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid
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During muscular contraction which of the following events occur?(1) 'H' zone disappears(2) 'A' band widens(3) 'I' band r
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Match List-I with List-II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli
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Assertion (A) : A person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficul
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Which of these is not an important component of initiation of parturition in humans?
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Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?
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Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid
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The Adenosine deaminase deficiency results into
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Which one of the following statements about histones is wrong?
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Statement I : The codon 'AUG' codes for methionine and phenylalanine.Statement II : 'AAA' and 'AAG' both codons code for
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Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of
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Following are the statements about prostomium of earthworm.(1) It serves as a covering for mouth.(2) It helps to open cr
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Chemistry

The incorrect statement among the following is :
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Given below are two statements :Statement I :Aspirin and Paracetamol belong to the class of narcotic analgesics.Statemen
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Statement I : Acid strength increases in the order given as HF << HCl << HBr << HI.Statement II : As t
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Which one among the following is the correct option for right relationship between CP and CV for one mole of ideal gas?
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BF3 is planar and electron deficient compound. Hybridization and number of elements around the central atom, respectivel
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The major product of the following chemical reaction is :
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The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol$$-$$1 respect
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A particular station of All India Radio, New Delhi broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of
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Which of the following reactions is the metal displacement reaction? Choose the right option.
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The compound which shows metamerism is :
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Match List - I with List - II : List - I List - II (a) $$PC{l_5}$$ (i) Squ
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Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.
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Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :
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Ethylene diaminetetraacetate (EDTA) ion is :
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The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is bas
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An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirica
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The pKb of dimethyl amine and pKa of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH
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The correct structure of 2, 6-dimethyl-dec-4-ene is
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The following solutions were prepared by dissolving 10 g of glucose (C6H12O6) in 250 ml of water (P1), 10 g of urea (CH4
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The correct sequence of bond enthalpy of 'C-X' bond is :
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Dihedral angle of least stable conformer of ethane is :
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Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.
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What is the IUPAC name of the organic compound formed in the following chemical reaction?
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For a reaction, A $$\to$$ B, enthalpy of reaction is $$-$$4.2 kJ mol$$-$$1 and enthalpy of activation is 9.6 kJ mol$$-$$
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Consider the above reaction and identify the missing reagent/chemical.
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The correct option for the value of vapour pressure of a solution at 45$$^\circ$$C with benzene to octane in molar ratio
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Match List-I with List-II Choose the correct answer from the options given below.
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The intermediate compound 'X' in the following chemical reaction is :
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The product formed in the following chemical reaction is :
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The slope of Arrhenius plot $$\left( {\ln \,k\,v/s{1 \over T}} \right)$$ of first order reactino is $$-$$5 $$\times$$ 10
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For irreversible expansion of an ideal gas under isothermal condition, the correct option is :
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From the following pairs of ions which one is not an iso-electronic pair?
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The molar conductivity of 0.007 M acetic acid is 20 S cm2 mol$$-$$1. What is the dissociation constant of acetic acid? C
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Which of the following molecules is non-polar in nature?
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Match List-I with List-II : List-I List-II (a) $${[Fe{(CN)_6}]^{3 - }}$$ (i)
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In which one of the following arrangements the given sequence is not strictly according to the properties indicted again
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Physics

The E and G respectively denote energy and gravitational constant, then $${E \over G}$$ has the dimensions of :
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An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance 'R' are connected in series to an
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A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is :
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A thick current carrying cable of radius 'R' carries current 'I' uniformly distributed across its cross section. The var
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A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding per nucleon of unfragmente
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A parallel plate capacitor has a uniform electric field $$\overrightarrow E $$ in the space between the plates. If the d
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The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600nm, when it
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Polar molecules are the molecules :
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A capacitor of capacitance 'C', is connected across an ac source of voltage V, given by V = V0sin$$\omega$$tThe displace
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A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : 0 mmCircular
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Find the value of the angle of emergence from the prism. Refractive index of the glass is $$\sqrt 3 $$
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In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V
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A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three time
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The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-secti
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Water falls from a height of 60m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10%
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An infinitely long straight conductor carries a current of 5A as shown. An electron is moving with a speed of 105 m/s pa
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Consider the following statements (A) and (B) and identify the correct answer.(A) A Zener diode is connected in reverse
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A spring is stretched by 5 cm by a force 10 N. The time period of the oscillations when a mass of 2 kg is suspended by i
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The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An ex
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A dipole is placed in an electric field as shown. In which direction will it move?
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A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a
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The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radiu
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An electromagnetic wave of wavelength '$$\lambda$$' is incident on a photosensitive surface of negligible work function.
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A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since :
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Two charged spherical conductors of radius R1 and R2 are connected by a wire. Then the ratio of surface charge densities
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For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct po
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A cup of coffee cools from 90$$^\circ$$C to 80$$^\circ$$C in t minutes, when the room temperature is 20$$^\circ$$C. The
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The equivalent capacitance of the combination shown in the figure is :
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If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of en
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A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled
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The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerin becomes constant
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Column - I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives so
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Match Column - I and Column - II and choose the correct match from the given choices. Column - I C
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In the product$$\overrightarrow F = q\left( {\overrightarrow v \times \overrightarrow B } \right)$$$$ = q\overrightarr
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From a circular ring of mass 'M' and radius 'R' an arc corresponding to a 90$$^\circ$$ sector is removed. The moment of
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Three resistors having resistances r1, r2 and r3 are connected as shown in the given circuit. The ratio $${{{i_3}} \over
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A ball of mass 0.15 kg is dropped from a height 10m, strikes the ground and rebounds to the same height. The magnitude o
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A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44W lamp. Ignoring power lo
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A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of ,(i) a
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A particle of mass 'm' is projected with a velocity $$\upsilon $$ = kVe = (k < 1) from the surface of the earth. (Ve
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A series LCR circuit containing 5.0 H inductor, 80$$\mu$$F capacitor and 40$$\Omega$$ resistor is connected to 230V vari
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A particle moving in a circle of radius R with a uniform speed takes a time T to complete one revolution. If this partic
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Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1 >&
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Twenty seven drops of same size are charged at 220V each. They combine to form a bigger drop. Calculate the potential of
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A uniform rod of length 200 cm and mass 500 g is balanced on a wedge placed at 40 cm mark. A mass of 2 kg is suspended f
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A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm. If a plane mirror were put per
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A car starts from rest and accelerates at 5m/s2. At t = 4 s, a ball is dropped out of a window by a person sitting in th
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For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at th
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