Official NTA NEET-UG 2020 question paper, set HAKAN-H4. 174 questions across Physics, Chemistry, and Biology with worked solutions and the official answer key.
The average thermal energy for a mono-atomic gas is : (k B is Boltzmann constant and T, absolute temperature)
B 7 k T 2
B 1 k T 2
B 3 k T 2
B 5 k T 2
Which of the following graph represents the variation of resistivity ( ρ ) with temperature (T) for copper ?
For which one of the following, Bohr model is not valid ?
Singly ionised neon atom (Ne + )
Hydrogen atom
Singly ionised helium atom (He + )
Deuteron atom
The quantities of heat required to raise the temperature of two solid copper spheres of radii r 1 and r 2 (r 1 = 1.5 r 2 ) through 1 K are in the ratio :
5 3
27 8
9 4
3 2
A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is :
20.0 g
5 g
5.0 g
10.0 g
Two particles of mass 5 kg and 10 kg respectively are attached to the two ends of a rigid rod of length 1 m with negligible mass. The centre of mass of the system from the 5 kg particle is nearly at a distance of :
80 cm
33 cm
50 cm
67 cm
An iron rod of susceptibility 599 is subjected to a magnetising field of 1200 A m − 1 . The permeability of the material of the rod is : ( μ 0 = 4 π× 10 − 7 T m A − 1 )
4 π× 10 − 7 T m A − 1
4 π× 10 − 4 T m A − 1
8.0 × 10 − 5 T m A − 1
4 π× 10 − 5 T m A − 1
When a uranium isotope 235 92 U is bombarded with a neutron, it generates 89 36 Kr , three neutrons and :
103 36 Kr
144 56 Ba
91 40 Zr
1 10 36 Kr
A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27 8 C. Its density is : (R = 8.3 J mol − 1 K − 1 )
0.02 kg/m 3
0.5 kg/m 3
0.2 kg/m 3
0.1 kg/m 3
A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth ?
24 N
48 N
32 N
30 N
An electron is accelerated from rest through a potential difference of V volt. If the de Broglie wavelength of the electron is 1.227 × 10 − 2 nm, the potential difference is :
10 4 V
10 V
10 2 V
10 3 V
A short electric dipole has a dipole moment of 16 × 10 − 9 C m. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of 60 8 with the dipole axis is : 9 2 2 0 1 9 10 N m /C 4 = × πȏ
zero
50 V
200 V
400 V
A ball is thrown vertically downward with a velocity of 20 m/s from the top of a tower. It hits the ground after some time with a velocity of 80 m/s. The height of the tower is : (g = 10 m/s 2 )
300 m
360 m
340 m
320 m
A spherical conductor of radius 10 cm has a charge of 3.2 × 10 − 7 C distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere ? 9 2 2 0 1 9 10 N m /C 4 = × πȏ
28 × 10 7 N/C
28 × 10 4 N/C
28 × 10 5 N/C
28 × 10 6 N/C
The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is : (c = speed of electromagnetic waves)
1 : c 2
c : 1
1 : 1
1 : c
In Young’s double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :
one-fourth
double
half
four times
In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency increases to 7 Hz. If the frequency of A is 530 Hz, the original frequency of B will be :
537 Hz
523 Hz
524 Hz
536 Hz
The increase in the width of the depletion region in a p-n junction diode is due to :
increase in forward current
forward bias only
reverse bias only
both forward bias and reverse bias
A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to L 1 when mass M is suspended from its free end. The expression for Young’s modulus is :
1 MgL A(L L) −
1 MgL AL
1 Mg(L L) AL −
1 MgL AL
The energy required to break one bond in DNA is 10 − 20 J. This value in eV is nearly :
0.006
6
0.6
0.06
Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled ?
zero
doubled
four times
one-fourth
Dimensions of stress are :
[ M L − 1 T − 2 ]
[ M L T − 2 ]
[ M L 2 T − 2 ]
[ M L 0 T − 2 ]
A charged particle having drift velocity of 7.5 × 10 − 4 m s − 1 in an electric field of 3 × 10 − 10 Vm − 1 , has a mobility in m 2 V − 1 s − 1 of :
25 × 10 − 15
25 × 10 15
5 × 10 6
5 × 10 − 6
A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is :
0 mm
0.01 mm
0.25 mm
0.5 mm
A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ , then the angle of incidence is nearly equal to :
A 2 μ
A 2 μ
2A μ
μ A
A 40 μ F capacitor is connected to a 200 V, 50 Hz ac supply. The rms value of the current in the circuit is, nearly :
25.1 A
7 A
05 A
5 A
For transistor action, which of the following statements is correct ?
The base region must be very thin and lightly doped.
Base, emitter and collector regions should have same doping concentrations.
Base, emitter and collector regions should have same size.
Both emitter junction as well as the collector junction are forward biased.
The energy equivalent of 0.5 g of a substance is :
0.5 × 10 13 J
5 × 10 16 J
5 × 10 13 J
5 × 10 13 J
Taking into account of the significant figures, what is the value of 9.99 m − 0.0099 m ?
9.9 m
9.9801 m
9.98 m
9.980 m
Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (g) is :
g/10
g
g/2
g/5
Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is :
isobaric
isothermal
adiabatic
isochoric
For the logic circuit shown, the truth table is :
A B Y 0 0 1 0 1 0 1 0 0 1 1 0 - o 0 o -
A B Y 0 0 0 0 1 0 1 0 0 1 1 1
A B Y 0 0 0 0 1 1 1 0 1 1 1 1
A B Y 0 0 1 0 1 1 1 0 1 1 1 0
Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is :
6.00 × 10 − 7 rad
66 × 10 − 7 rad
83 × 10 − 7 rad
7.32 × 10 − 7 rad
The capacitance of a parallel plate capacitor with air as medium is 6 μ F. With the introduction of a dielectric medium, the capacitance becomes 30 μ F. The permittivity of the medium is : ( ȏ 0 = 8.85 × 10 − 12 C 2 N − 1 m − 2 )
5.00 C 2 N − 1 m − 2
0.44 × 10 − 13 C 2 N − 1 m − 2
77 × 10 − 12 C 2 N − 1 m − 2
0.44 × 10 − 10 C 2 N − 1 m − 2
The color code of a resistance is given below : The values of resistance and tolerance, respectively, are :
470 Ω , 5%
470 k Ω , 5%
47 k Ω , 10%
7 k Ω , 5%
In a certain region of space with volume 0.2 m 3 , the electric potential is found to be 5 V throughout. The magnitude of electric field in this region is :
5 N/C
zero
0.5 N/C
1 N/C
The solids which have the negative temperature coefficient of resistance are :
insulators and semiconductors
metals
insulators only
semiconductors only
Light with an average flux of 20 W/cm 2 falls on a non-reflecting surface at normal incidence having surface area 20 cm 2 . The energy received by the surface during time span of 1 minute is :
48 × 10 3 J
10 × 10 3 J
12 × 10 3 J
24 × 10 3 J
The Brewsters angle i b for an interface should be :
i b = 90 8
0 8 < i b < 30 8
30 8 < i b < 45 8
45 8 < i b < 90 8
A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is : ( μ 0 = 4 π× 10 − 7 T m A − 1 )
14 × 10 − 5 T
6.28 × 10 − 4 T
14 × 10 − 4 T
6.28 × 10 − 5 T
A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is 3 π . If instead C is removed from the circuit, the phase difference is again 3 π between current and voltage. The power factor of the circuit is :
0
zero
0.5
− 1.0
The phase difference between displacement and acceleration of a particle in a simple harmonic motion is :
zero
π rad
3 rad 2 π
rad 2 π
Find the torque about the origin when a force of ∧ 3 N j acts on a particle whose position vector is 2 m k ∧ .
6 N m k ∧
6 N m i ∧
6 N m j ∧
6 N m i ∧ −
Which of the following alkane cannot be made in good yield by Wurtz reaction ?
n-Butane
n-Hexane
2,3-Dimethylbutane
n-Heptane
What is the change in oxidation number of carbon in the following reaction ? CH 4 (g) + 4Cl 2 (g) → CCl 4 (l) + 4HCl(g)
0 to + 4
+ 4 to + 4
0 to − 4
− 4 to + 4
An alkene on ozonolysis gives methanal as one of the product. Its structure is :
Urea reacts with water to form A which will decompose to form B . B when passed through Cu 2 + (aq), deep blue colour solution C is formed. What is the formula of C from the following ?
CuCO 3 ⋅ Cu(OH) 2
CuSO 4
[Cu(NH 3 ) 4 ] 2 +
Cu(OH) 2
Identify the incorrect match. Name IUPAC Official Name
| Column - I | Column - II |
| (a) Unnilunium | (i) Mendelevium |
| (b) Unniltrium | (ii) Lawrencium |
| (c) Unnilhexium | (iii) Seaborgium |
| (d) Unununnium | (iv) Darmstadtium |
(d), (iv)
(a), (i)
(b), (ii)
(c), (iii)
Elimination reaction of 2-Bromo-pentane to form pent-2-ene is : (a) β -Elimination reaction (b) Follows Zaitsev rule (c) Dehydrohalogenation reaction (d) Dehydration reaction
(a), (b), (d)
(a), (b), (c)
(a), (c), (d)
(b), (c), (d)
Which one of the followings has maximum number of atoms ?
1 g of Li(s) [Atomic mass of Li = 7]
1 g of Ag(s) [Atomic mass of Ag = 108]
1 g of Mg(s) [Atomic mass of Mg = 24]
1 g of O 2 (g) [Atomic mass of O = 16]
Identify the correct statement from the following :
Pig iron can be moulded into a variety of shapes.
Wrought iron is impure iron with 4% carbon.
Blister copper has blistered appearance due to evolution of CO 2 .
Vapour phase refining is carried out for Nickel by Van Arkel method.
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following ?
Hyperconjugation
− I effect of − CH 3 groups
− R effect of − CH 3 groups
+ R effect of − CH 3 groups
A mixture of N 2 and Ar gases in a cylinder contains 7 g of N 2 and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N 2 is : [Use atomic masses (in g mol − 1 ) : N = 14, Ar = 40]
18 bar
9 bar
12 bar
15 bar
Which of the following set of molecules will have zero dipole moment ?
Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene
Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene
Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene
Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene
Match the following : Oxide Nature
| Column - I | Column - II |
| (a) CO | (i) Basic |
| (b) BaO | (ii) Neutral |
| (c) Al 2 O 3 | (iii) Acidic |
| (d) Cl 2 O 7 | (iv) Amphoteric Which of the following is correct option ? |
(iv) (iii) (ii) (i)
(i) (ii) (iii) (iv)
(ii) (i) (iv) (iii)
(iii) (iv) (i) (ii)
The rate constant for a first order reaction is 4.606 × 10 − 3 s − 1 . The time required to reduce 2.0 g of the reactant to 0.2 g is :
1000 s
100 s
200 s
500 s
Which of the following amine will give the carbylamine test ?
Measuring Zeta potential is useful in determining which property of colloidal solution ?
Size of the colloidal particles
Viscosity
Solubility
Stability of the colloidal particles
An increase in the concentration of the reactants of a reaction leads to change in :
collision frequency
activation energy
heat of reaction
threshold energy
The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.
Potassium
Iron
Copper
Calcium
On electrolysis of dil.sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be :
SO 2 gas
Hydrogen gas
Oxygen gas
H 2 S gas
Which of the following is a basic amino acid ?
Lysine
Serine
Alanine
Tyrosine
Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as :
Cross Aldol condensation
Aldol condensation
Cannizzaro’s reaction
Cross Cannizzaro’s reaction
The calculated spin only magnetic moment of Cr 2 + ion is :
84 BM
87 BM
90 BM
5.92 BM
Hydrolysis of sucrose is given by the following reaction. Sucrose + H 2 O ⇌ Glucose + Fructose If the equilibrium constant (K c ) is 2 × 10 13 at 300 K, the value of ∆ r G s at the same temperature will be :
− 8.314 J mol − 1 K − 1 × 300 K × ln(4 × 10 13 )
− 8.314 J mol − 1 K − 1 × 300 K × ln(2 × 10 13 )
8.314 J mol − 1 K − 1 × 300 K × ln(2 × 10 13 )
8.314 J mol − 1 K − 1 × 300 K × ln(3 × 10 13 )
The mixture which shows positive deviation from Raoult’s law is :
Chloroethane + Bromoethane
Ethanol + Acetone
Benzene + Toluene
Acetone + Chloroform
Sucrose on hydrolysis gives :
α -D-Fructose +β -D-Fructose
β -D-Glucose +α -D-Fructose
α -D-Glucose +β -D-Glucose
α -D-Glucose +β -D-Fructose
Paper chromatography is an example of :
Column chromatography
Adsorption chromatography
Partition chromatography
Thin layer chromatography
Which of the following is the correct order of increasing field strength of ligands to form coordination compounds ?
− − − − 2 2 4 CN < C O < SCN < F
− − − − 2 2 4 SCN < F < C O < CN
− − − − 2 2 4 SCN < F < CN < C O
− − − − 2 2 4 F < SCN < C O < CN
The correct option for free expansion of an ideal gas under adiabatic condition is :
q = 0, ∆ T = 0 and w = 0
q = 0, ∆ T < 0 and w > 0
q < 0, ∆ T = 0 and w = 0
q > 0, ∆ T > 0 and w > 0
For the reaction, 2Cl(g) → Cl 2 (g), the correct option is :
∆ r H > 0 and ∆ r S > 0
∆ r H > 0 and ∆ r S < 0
∆ r H < 0 and ∆ r S > 0
∆ r H < 0 and ∆ r S < 0
Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give :
Isobutyl alcohol
Isopropyl alcohol
Sec. butyl alcohol
Tert. butyl alcohol
Identify compound X in the following sequence of reactions :
The number of Faradays(F) required to produce 20 g of calcium from molten CaCl 2 (Atomic mass of Ca = 40 g mol − 1 ) is :
4
1
2
3
Which of the following is a cationic detergent ?
Sodium dodecylbenzene sulphonate
Sodium lauryl sulphate
Sodium stearate
Cetyltrimethyl ammonium bromide
Which of the following is a natural polymer ?
poly (Butadiene-acrylonitrile)
cis -1,4-polyisoprene
poly (Butadiene-styrene)
polybutadiene
Which of the following oxoacid of sulphur has − O − O − linkage ?
H 2 S 2 O 7 , pyrosulphuric acid
H 2 SO 3 , sulphurous acid
H 2 SO 4 , sulphuric acid
H 2 S 2 O 8 , peroxodisulphuric acid
Find out the solubility of Ni(OH) 2 in 0.1 M NaOH. Given that the ionic product of Ni(OH) 2 is 2 × 10 − 15 .
1 × 10 8 M
2 × 10 − 13 M
2 × 10 − 8 M
1 × 10 − 13 M
Identify a molecule which does not exist.
O 2
He 2
Li 2
C 2
The freezing point depression constant (K f ) of benzene is 5.12 K kg mol − 1 . The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places) :
0.60 K
0.20 K
0.80 K
0.40 K
HCl was passed through a solution of CaCl 2 , MgCl 2 and NaCl. Which of the following compound(s) crystallise(s) ?
NaCl, MgCl 2 and CaCl 2
Both MgCl 2 and CaCl 2
Only NaCl
Only MgCl 2
The number of protons, neutrons and electrons in 175 71 Lu , respectively, are :
175, 104 and 71
71, 104 and 71
104, 71 and 71
71, 71 and 104
Which of the following is not correct about carbon monoxide ?
It is produced due to incomplete combustion.
It forms carboxyhaemoglobin.
It reduces oxygen carrying ability of blood.
The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.
Match the following and identify the correct option.
| Column - I | Column - II |
| (a) CO(g) + H 2 (g) | (i) Mg(HCO 3 ) 2 + Ca(HCO 3 ) 2 |
| (b) Temporary | (ii) An electron hardness of deficient hydride water |
| (c) B 2 H 6 | (iii) Synthesis gas |
| (d) H 2 O 2 | (iv) Non-planar structure |
(i) (iii) (ii) (iv)
(iii) (i) (ii) (iv)
(iii) (ii) (i) (iv)
(iii) (iv) (ii) (i)
Identify the incorrect statement.
Sapwood is involved in conduction of water and minerals from root to leaf.
Heart wood does not conduct water but gives mechanical support.
Due to deposition of tannins, resins, oils etc., heart wood is dark in colour.
Sapwood is the innermost secondary xylem and is lighter in colour.
An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is :
× 4 288 pm 2
× 3 288 pm 4
× 2 288 pm 4
× 4 288 pm 3
Identify the correct statements from the following : (a) CO 2 (g) is used as refrigerant for ice-cream and frozen food. (b) The structure of C 60 contains twelve six carbon rings and twenty five carbon rings. (c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline. (d) CO is colorless and odourless gas.
(c) and (d) only
(a), (b) and (c) only
(a) and (c) only
(b) and (c) only
Match the following concerning essential elements and their functions in plants :
| Column - I | Column - II |
| (a) Iron | (i) Photolysis of water |
| (b) Zinc | (ii) Pollen germination |
| (c) Boron | (iii) Required for chlorophyll biosynthesis |
| (d) Manganese | (iv) IAA biosynthesis |
(iv) (i) (ii) (iii)
(ii) (i) (iv) (iii)
(iv) (iii) (ii) (i)
(iii) (iv) (ii) (i)
Which of the following is not an attribute of a population ?
Species interaction
Sex ratio
Natality
Mortality
Which of the following is put into Anaerobic sludge digester for further sewage treatment ?
Activated sludge
Primary sludge
Floating debris
Effluents of primary treatment
The roots that originate from the base of the stem are :
Lateral roots
Fibrous roots
Primary roots
Prop roots
Floridean starch has structure similar to :
Laminarin and cellulose
Starch and cellulose
Amylopectin and glycogen
Mannitol and algin
Dissolution of the synaptonemal complex occurs during :
Leptotene
Pachytene
Zygotene
Diplotene
Identify the correct statement with reference to human digestive system.
Vermiform appendix arises from duodenum.
Ileum opens into small intestine.
Serosa is the innermost layer of the alimentary canal.
Ileum is a highly coiled part.
The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is :
Plasmolysis
Transpiration
Root pressure
Imbibition
The body of the ovule is fused within the funicle at :
Chalaza
Hilum
Micropyle
Nucellus
How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits ?
8
4
2
14
Which of the following statements are true for the phylum-Chordata ? (a) In Urochordata notochord extends from head to tail and it is present throughout their life. (b) In Vertebrata notochord is present during the embryonic period only. (c) Central nervous system is dorsal and hollow. (d) Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata.
(b) and (c)
(d) and (c)
(c) and (a)
(a) and (b)
The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are :
Ammonia and hydrogen
Ammonia alone
Nitrate alone
Ammonia and oxygen
The number of substrate level phosphorylations in one turn of citric acid cycle is :
Three
Zero
One
Two
Which of the following regions of the globe exhibits highest species diversity ?
Amazon forests
Western Ghats of India
Madagascar
Himalayas
The specific palindromic sequence which is recognized by EcoRI is :
5' - GGATCC - 3' 3' - CCTAGG - 5'
5' - GAATTC - 3' 3' - CTTAAG - 5'
5' - GGAACC - 3' 3' - CCTTGG - 5'
5' - CTTAAG - 3' 3' - GAATTC - 5'
Match the following columns and select the correct option.
| Column - I | Column - II |
| (a) Eosinophils | (i) Immune response |
| (b) Basophils | (ii) Phagocytosis |
| (c) Neutrophils | (iii) Release histaminase, destructive enzymes |
| (d) Lymphocytes | (iv) Release granules containing histamine |
(iv) (i) (ii) (iii)
(i) (ii) (iv) (iii)
(ii) (i) (iii) (iv)
(iii) (iv) (ii) (i)
Match the following columns and select the correct option.
| Column - I | Column - II |
| (a) 6 - 15 pairs of gill slits | (i) Trygon |
| (b) Heterocercal caudal fin | (ii) Cyclostomes |
| (c) Air Bladder | (iii) Chondrichthyes |
| (d) Poison sting | (iv) Osteichthyes |
(iv) (ii) (iii) (i)
(ii) (iii) (iv) (i)
(i) (iv) (iii) (ii)
(iii) (iv) (i) (ii)
Match the following columns:
| Column - I | Column - II |
| (a) Bt cotton | (i) Gene therapy |
| (b) Adenosine | (ii) Cellular defence deaminase deficiency |
| (c) RNAi | (iii) Detection of HIV infection |
| (d) PCR | (iv) Bacillus thuringiensis |
(i) (ii) (iii) (iv)
(iv) (i) (ii) (iii)
(iii) (ii) (i) (iv)
(ii) (iii) (iv) (i)
Identify the substances having glycosidic bond and peptide bond, respectively in their structure :
Inulin, insulin
Chitin, cholesterol
Glycerol, trypsin
Cellulose, lecithin
Select the option including all sexually transmitted diseases.
Cancer, AIDS, Syphilis
Gonorrhoea, Syphilis, Genital herpes
Gonorrhoea, Malaria, Genital herpes
AIDS, Malaria, Filaria
Name the enzyme that facilitates opening of DNA helix during transcription.
RNA polymerase
DNA ligase
DNA helicase
DNA polymerase
Which of the following is correct about viroids ?
They have free DNA without protein coat.
They have RNA with protein coat.
They have free RNA without protein coat.
They have DNA with protein coat.
Match the following :
| Column - I | Column - II |
| (a) Inhibitor of catalytic | (i) Ricin activity |
| (b) Possess peptide bonds | (ii) Malonate |
| (c) Cell wall material in | (iii) Chitin fungi |
| (d) Secondary metabolite | (iv) Collagen |
(ii) (iii) (i) (iv)
(ii) (iv) (iii) (i)
(iii) (i) (iv) (ii)
(iii) (iv) (i) (ii)
In which of the following techniques, the embryos are transferred to assist those females who cannot conceive ?
GIFT and ICSI
ZIFT and IUT
GIFT and ZIFT
ICSI and ZIFT
Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G 0 ). This process occurs at the end of :
G 2 phase
M phase
G 1 phase
S phase
Match the organism with its use in biotechnology.
| Column - I | Column - II |
| (a) Bacillus | (i) Cloning vector thuringiensis |
| (b) Thermus | (ii) Construction of aquaticus first rDNA molecule |
| (c) Agrobacterium | (iii) DNA polymerase tumefaciens |
| (d) Salmonella | (iv) Cry proteins typhimurium |
(iii) (iv) (i) (ii)
(ii) (iv) (iii) (i)
(iv) (iii) (i) (ii)
(iii) (ii) (iv) (i)
Strobili or cones are found in :
Equisetum
Salvinia
Pteris
Marchantia
Identify the correct statement with regard to G 1 phase (Gap 1) of interphase.
Nuclear Division takes place.
DNA synthesis or replication takes place.
Reorganisation of all cell components takes place.
Cell is metabolically active, grows but does not replicate its DNA.
The first phase of translation is :
Recognition of an anti-codon
Binding of mRNA to ribosome
Recognition of DNA molecule
Aminoacylation of tRNA
Match the following columns:
| Column - I | Column - II |
| (a) Gregarious, polyphagous | (i) Asterias pest |
| (b) Adult with radial symmetry and larva with bilateral symmetry | (ii) Scorpion |
| (c) Book lungs | (iii) Ctenoplana |
| (d) Bioluminescence | (iv) Locusta |
(ii) (i) (iii) (iv)
(i) (iii) (ii) (iv)
(iv) (i) (ii) (iii)
(iii) (ii) (i) (iv)
The enzyme enterokinase helps in conversion of :
pepsinogen into pepsin
protein into polypeptides
trypsinogen into trypsin
caseinogen into casein
Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their :
Effect on reproduction
Nutritive value
Growth response
Defence action
Match the following diseases with the causative organism:
| Column - I | Column - II |
| (a) Typhoid | (i) Wuchereria |
| (b) Pneumonia | (ii) Plasmodium |
| (c) Filariasis | (iii) Salmonella |
| (d) Malaria | (iv) Haemophilus |
(iv) (i) (ii) (iii)
(i) (iii) (ii) (iv)
(iii) (iv) (i) (ii)
(ii) (i) (iii) (iv)
Ray florets have :
Half inferior ovary
Inferior ovary
Superior ovary
Hypogynous ovary
The QRS complex in a standard ECG represents :
Repolarisation of ventricles
Repolarisation of auricles
Depolarisation of auricles
Depolarisation of ventricles
Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.
Abscisic acid
Cytokinin
Gibberellin
Ethylene
Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action ? (a) Darwin’s Finches of Galapagos islands. (b) Herbicide resistant weeds. (c) Drug resistant eukaryotes. (d) Man-created breeds of domesticated animals like dogs.
only (d)
only (a)
(a) and (c)
(b), (c) and (d)
Embryological support for evolution was disapproved by :
Oparin
Karl Ernst von Baer
Alfred Wallace
Charles Darwin
Which of the following pairs is of unicellular algae ?
Chlorella and Spirulina
Laminaria and Sargassum
Gelidium and Gracilaria
Anabaena and Volvox
Which of the following statements about inclusion bodies is incorrect ?
These represent reserve material in cytoplasm.
They are not bound by any membrane.
These are involved in ingestion of food particles.
They lie free in the cytoplasm.
Which of the following would help in prevention of diuresis ?
Decrease in secretion of renin by JG cells
More water reabsorption due to undersecretion of ADH
Reabsorption of Na + and water from renal tubules due to aldosterone
Atrial natriuretic factor causes vasoconstriction
Select the correct match.
Thalassemia - X linked
Haemophilia - Y linked
Phenylketonuria - Autosomal dominant trait
Sickle cell anaemia - Autosomal recessive trait, chromosome-11
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct ?
There is no relationship between Gross primary productivity and Net primary productivity.
Gross primary productivity is always less than net primary productivity.
Gross primary productivity is always more than net primary productivity.
Gross primary productivity and Net primary productivity are one and same.
Identify the wrong statement with reference to transport of oxygen.
Low pCO 2 in alveoli favours the formation of oxyhaemoglobin.
Binding of oxygen with haemoglobin is mainly related to partial pressure of O 2 .
Partial pressure of CO 2 can interfere with O 2 binding with haemoglobin.
Higher H + conc. in alveoli favours the formation of oxyhaemoglobin.
The infectious stage of Plasmodium that enters the human body is :
Male gametocytes
Trophozoites
Sporozoites
Female gametocytes
Presence of which of the following conditions in urine are indicative of Diabetes Mellitus ?
Renal calculi and Hyperglycaemia
Uremia and Ketonuria
Uremia and Renal Calculi
Ketonuria and Glycosuria
In light reaction, plastoquinone facilitates the transfer of electrons from :
PS-I to ATP synthase
PS-II to Cytb 6 f complex
Cytb 6 f complex to PS-I
PS-I to NADP +
Match the following columns:
| Column - I | Column - II |
| (a) Organ of Corti | (i) Located on the basilar membrane |
| (b) Cochlea | (ii) Coiled part of the labyrinth |
| (c) Eustachian tube | (iii) Connects middle ear and pharynx |
| (d) Stapes | (iv) Attached to the oval window |
(iii) (i) (iv) (ii)
(ii) (iii) (i) (iv)
(i) (ii) (iv) (iii)
(iv) (ii) (i) (iii)
Flippers of Penguins and Dolphins are examples of :
Natural selection
Adaptive radiation
Convergent evolution
Industrial melanism
Snow-blindness in Antarctic region is due to :
Damage to retina caused by infra-red rays
Freezing of fluids in the eye by low temperature
Inflammation of cornea due to high dose of UV-B radiation
High reflection of light from snow
The ovary is half inferior in :
Plum
Brinjal
Mustard
Sunflower
The process of growth is maximum during :
Dormancy
Log phase
Lag phase
Senescence
Which of the following is not an inhibitory substance governing seed dormancy ?
Para-ascorbic acid
Gibberellic acid
Abscisic acid
Phenolic acid
The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of :
1 molecule of 4-C compound and 1 molecule of 2-C compound
2 molecules of 3-C compound
1 molecule of 3-C compound
1 molecule of 6-C compound
In water hyacinth and water lily, pollination takes place by :
insects and water
insects or wind
water currents only
wind and water
According to Robert May, the global species diversity is about :
7 million
5 million
20 million
50 million
Identify the wrong statement with regard to Restriction Enzymes.
Sticky ends can be joined by using DNA ligases.
Each restriction enzyme functions by inspecting the length of a DNA sequence.
They cut the strand of DNA at palindromic sites.
They are useful in genetic engineering.
In gel electrophoresis, separated DNA fragments can be visualized with the help of :
Ethidium bromide in infrared radiation
Acetocarmine in bright blue light
Ethidium bromide in UV radiation
Acetocarmine in UV radiation
By which method was a new breed ‘Hisardale’ of sheep formed by using Bikaneri ewes and Marino rams ?
Inbreeding
Out crossing
Mutational breeding
Cross breeding
Bilaterally symmetrical and acoelomate animals are exemplified by :
Annelida
Ctenophora
Platyhelminthes
Aschelminthes
If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 10 9 bp, then the length of the DNA is approximately :
7 meters
0 meters
5 meters
2 meters
Experimental verification of the chromosomal theory of inheritance was done by :
Morgan
Mendel
Sutton
Boveri
Choose the correct pair from the following :
Exonucleases - Make cuts at specific positions within DNA
Ligases - Join the two DNA molecules
Polymerases - Break the DNA into fragments
Nucleases - Separate the two strands of DNA
Identify the wrong statement with reference to immunity.
Foetus receives some antibodies from mother, it is an example for passive immunity.
When exposed to antigen (living or dead) antibodies are produced in the host’s body. It is called “Active immunity”.
When ready-made antibodies are directly given, it is called “Passive immunity”.
Active immunity is quick and gives full response.
Select the correct events that occur during inspiration. (a) Contraction of diaphragm (b) Contraction of external inter-costal muscles (c) Pulmonary volume decreases (d) Intra pulmonary pressure increases
only (d)
(a) and (b)
(c) and (d)
(a), (b) and (d)
Which of the following statements is not correct ?
Genetically engineered insulin is produced in E-Coli.
In man insulin is synthesised as a proinsulin.
The proinsulin has an extra peptide called C-peptide.
The functional insulin has A and B chains linked together by hydrogen bonds.
Match the trophic levels with their correct species examples in grassland ecosystem.
| Column - I | Column - II |
| (a) Fourth trophic level | (i) Crow |
| (b) Second trophic level | (ii) Vulture |
| (c) First trophic level | (iii) Rabbit |
| (d) Third trophic level | (iv) Grass |
(i) (ii) (iii) (iv)
(ii) (iii) (iv) (i)
(iii) (ii) (i) (iv)
(iv) (iii) (ii) (i)
Match the following columns:
| Column - I | Column - II |
| (a) Pituitary gland | (i) Grave’s disease |
| (b) Thyroid gland | (ii) Diabetes mellitus |
| (c) Adrenal gland | (iii) Diabetes insipidus |
| (d) Pancreas | (iv) Addison’s disease |
(ii) (i) (iv) (iii)
(iv) (iii) (i) (ii)
(iii) (ii) (i) (iv)
(iii) (i) (iv) (ii)
If the head of cockroach is removed, it may live for few days because :
the head holds a 1/3 rd of a nervous system while the rest is situated along the dorsal part of its body.
the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.
the cockroach does not have nervous system.
the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.
Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.
Allele ‘i’ does not produce any sugar.
The gene (I) has three alleles.
A person will have only two of the three alleles.
When I A and I B are present together, they express same type of sugar.
Which of the following statements is correct ?
Adenine does not pair with thymine.
Adenine pairs with thymine through two H-bonds.
Adenine pairs with thymine through one H-bond.
Adenine pairs with thymine through three H-bonds.
Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells ?
Polysomes
Endoplasmic reticulum
Peroxisomes
Golgi bodies
Which one of the following is the most abundant protein in the animals ?
Insulin
Haemoglobin
Collagen
Lectin
The plant parts which consist of two generations - one within the other : (a) Pollen grains inside the anther (b) Germinated pollen grain with two male gametes (c) Seed inside the fruit (d) Embryo sac inside the ovule
(a) and (d)
(a) only
(a), (b) and (c)
(c) and (d)
Meiotic division of the secondary oocyte is completed :
At the time of fusion of a sperm with an ovum
Prior to ovulation
At the time of copulation
After zygote formation
The transverse section of a plant shows following anatomical features : (a) Large number of scattered vascular bundles surrounded by bundle sheath. (b) Large conspicuous parenchymatous ground tissue. (c) Vascular bundles conjoint and closed. (d) Phloem parenchyma absent. Identify the category of plant and its part :
Dicotyledonous root
Monocotyledonous stem
Monocotyledonous root
Dicotyledonous stem
Goblet cells of alimentary canal are modified from :
Compound epithelial cells
Squamous epithelial cells
Columnar epithelial cells
Chondrocytes
The sequence that controls the copy number of the linked DNA in the vector, is termed :
Recognition site
Selectable marker
Ori site
Palindromic sequence
Identify the basic amino acid from the following.
Valine
Tyrosine
Glutamic Acid
Lysine
Match the following with respect to meiosis :
| Column - I | Column - II |
| (a) Zygotene | (i) Terminalization |
| (b) Pachytene | (ii) Chiasmata |
| (c) Diplotene | (iii) Crossing over |
| (d) Diakinesis | (iv) Synapsis |
(ii) (iv) (iii) (i)
(iii) (iv) (i) (ii)
(iv) (iii) (ii) (i)
(i) (ii) (iv) (iii)
From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask :
CH 3 , H 2 , NH 3 and water vapor at 600 8 C
CH 4 , H 2 , NH 3 and water vapor at 800 8 C
CH 3 , H 2 , NH 4 and water vapor at 800 8 C
CH 4 , H 2 , NH 3 and water vapor at 600 8 C
Select the correct statement.
Insulin is associated with hyperglycemia.
Glucocorticoids stimulate gluconeogenesis.
Glucagon is associated with hypoglycemia.
Insulin acts on pancreatic cells and adipocytes.
Montreal protocol was signed in 1987 for control of :
Disposal of e-wastes
Transport of Genetically modified organisms from one country to another
Emission of ozone depleting substances
Release of Green House gases
Cuboidal epithelium with brush border of microvilli is found in :
eustachian tube
lining of intestine
ducts of salivary glands
proximal convoluted tubule of nephron
Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to :
Insect predators
Insect pests
Fungal diseases
Plant nematodes
Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle ?
Low concentration of FSH
High concentration of Estrogen
High concentration of Progesterone
Low concentration of LH
Identify the incorrect statement.
Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
Cr 2 + (d 4 ) is a stronger reducing agent than Fe 2 + (d 6 ) in water.
The oxidation states of chromium in − 2 4 CrO and − 2 2 7 Cr O are not the same.
The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
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Source: National Testing Agency (NTA), NEET-UG 2020 Question Paper, Code HAKAN-H4. Solutions written for educational use, NCERT-aligned. Verify your answers against the official NTA answer key.