datavorous/entrance-exam-dataset huggingface dataset:
Which of the following responses is taken up by some animals to avoid detection by predators?

Options:
A mutation
B anthropogenic action
C industrial pollution
D camouflage

The correct answer is:
camouflage

Solution:
If a predator is too efficient and overexploits its prey, then the prey might become extinct and following it, the predator will also become extinct for lack of food. This is the reason why predators in nature are âprudentâ. Prey species have evolved various defences to lessen the impact of predation. Some species of insects and frogs are cryptically-coloured (camouflaged) to avoid being detected easily by the predator.

Topic: Biology, Organisms and Populations, NEET
Which of the following restriction endonucleases cannot be used while using pBR322 as a cloning vector?

Options:
A PvuII
B BamHI
C SalI
D PstI

The correct answer is:
PvuII

Solution:
pBR322 has two restriction sites BamHI (from Bacillus amyloliquefaciens) and SalI (from Streptomyces albus) on the tetracycline-resistant gene (tetR), which acts as a selectable marker. It also has two restriction sites PstI (from Providenciastuartii) and PvuI (from Proteus vulgaris) on ampicillin-resistant gene (ampR), which also acts as a selectable marker. Hence, these four enzymes can be used. however, the restriction site for PvuII is present on rop (replication of plasmid) region. If used, it will interfere with the process of replication of plasmid.

Topic: Biology, Biotechnology - Principles and Processes, NEET
Which of the following results in high content of carboxyhemoglobin in blood?

Options:
A Smoking and alcohol
B Alcohol
C Cannabinoids
D Smoking but not alcohol

The correct answer is:
Smoking but not alcohol

Solution:
Cigarette smoke contains a high concentration of CO and smokers are exposed to an estimated 400-500 ppm CO while smoking and consequently have much higher COHb. A necessary consensus, given the variability level of COHb due to environmental CO, suggests an absolute upper limit of normal COHb of 3 % for non-smokers and 10 % for heavy smokers

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following reunites the exon segments after RNA splicing?

Options:
A RNA polymerase
B RNA primase
C RNA ligase
D RNA proteases

The correct answer is:
RNA ligase

Solution:
RNA polymerase enzyme catalyses the synthesis of RNA. It is single in prokaryotes. There are three types of RNA polymerases in eukaryotes-I for 28S, 18S and 5.8S RNA, II for mRNA and snRNA and III for tRNA, 5SRNA and ScRNA. Primase is an RNA polymerase that is used to initiate DNA synthesis. RNA ligase reunites the exon segment after RNA splicing.
So, correct answer is RNA ligase

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2002
Which of the following RNA is known as an adaptor molecule?

Options:
A All of these
B rRNA
C mRNA
D tRNA

The correct answer is:
tRNA

Solution:
tRNA has an anticodon loop that has bases complementary to the code present on mRNA. It also has an amino acid acceptor end to which amino acids bind. tRNA is specific for each amino acid. Hence, the specific tRNA is referred to as the adaptor molecule.

Topic: Biology, Molecular Basis of Inheritance, NEET
Which of the following RNAs is not required for the synthesis of protein?

Options:
A mRNA
B tRNA
C RNA
D siRNA

The correct answer is:
siRNA

Solution:
The process of synthesis of protein is called translation. It utilizes three types of RNA for the process:

(1) mRNA: It carries the message for a sequence of amino acids in the form of genetic codons.
(2) tRNA: It carries amino acids at its 3' end in charged form. Also, it has an anticodon loop to identify codons of mRNA.
(3) rRNA: It forms the ribosomal subunits and hence is called ribosomal RNA. Ribosomes are called protein factories of the cell.

siRNA or small interfering RNA is not used in the protein synthesis mechanism, it interferes with the synthesis of proteins.

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2021
Which of the following routes can be used to prepare beryllium hydride starting from lithium hydride?

Options:
A React lithium hydride with aluminium chloride then beryllium chloride
B React lithium hydride with aluminium chloride then beryllium bromide
C React lithium hydride with aluminium chloride then beryllium oxide
D React lithium hydride with aluminium chloride then beryllium sulfate

The correct answer is:
React lithium hydride with aluminium chloride then beryllium chloride

Solution:
Correct Option is : (A)
React lithium hydride with aluminium chloride then beryllium chloride

Topic: Chemistry, s Block Elements, NEET
Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria?

Options:
A 5S rRNA
B 18S rRNA
C 23S rRNA
D 5.8S rRNA

The correct answer is:
23S rRNA

Solution:
If two charged tRNAs are close enough the formation of peptide bond between them would be favored energetically. The presence of a catalyst would enhance the rate of peptide bond formation. It is catalysed by enzyme peptidyl transferase (a type of ribozyme — catalytic RNA i.e., 23S rRNA in bacteria and 28S rRNA in eukaryotes). The elongation factors are required in this process.

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2016 (Phase 2)
Which of the following salt on heating with conc. H2SO4 gives violet vapours?

Options:
A Iodide salt
B Nitrate salt
C Sulphate salt
D Bromide salt

The correct answer is:
Iodide salt

Solution:
I- ions are oxidised by H2SO4 to violet coloured I2.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following salts is the most basic in aqueous solution?

Options:
A Pb(CH3COO)2
B Al(CN)3
C CH3COOK
D FeCl3

The correct answer is:
CH3COOK

Solution:
CH3COOK is most basic among the given salts as its aqueous solution contains strong base KOH and weak acid CH3COOH so OH- concentration is more than H+ .

Topic: Chemistry, Ionic Equilibrium, NEET
Which of the following salts undergoes hydrolysis?

Options:
A Na2SO4
B CH3COOK
C KNO3
D NaBr

The correct answer is:
CH3COOK

Solution:
Na2SO4,NaBr and KNO3 are the salts of strong acids and strong bases, so they do not undergo hydrolysis. CH3COOK is salt of weak acid, CH3COOH and strong base KOH, so it hydrolyses to give basic solution (i.e., pH>7 )
CH3COO-K+HOH→CH3COOH(weak&nbspacid)+KOH(strong&nbspbase)

Topic: Chemistry, Ionic Equilibrium, NEET
Which of the following salts undergoes hydrolysis?

Options:
A K2SO4
B KCl
C NaNO3
D CH3COONa

The correct answer is:
CH3COONa

Solution:
K2SO4,KCl and NaNO3 are the salts of strong acids and strong basis, so they do not undergo hydrolysis. CH3COOK is salt of weak acid, CH3COOH and strong basic NaOH, so it hydrolyses to give basic solution (i.e., pH>7 )
CH 3 COO − K + HOH→ CH 3 COOH weak acid  +  KOH strong base

Topic: Chemistry, Ionic Equilibrium, NEET
Which of the following salts will give highest pH in water?

Options:
A KCl
B NaCl
C Na2CO3
D CuSO4

The correct answer is:
Na2CO3

Solution:
Na2CO3 is basic due to hydrolysis of CO32- ion
CO32-+H2O⇌HCO3-+OH-

Topic: Chemistry, Ionic Equilibrium, NEET, NEET 2014
Which of the following salts will give highest pH in water?

Options:
A CuSO4
B KCl
C Na2CO3
D NaCl

The correct answer is:
Na2CO3

Solution:
Na2CO3 will give highest pH in water because it is a salt of strong base and weak acid so aqueous solution is alkaline with pH more than 7. KCl, & NaCl are salts of strong acid & strong base so aqueous solution is neutral & pH is 7. CuSO4 is a salt of strong acid &weak base so aqueous solution is acidic with pH less than 7.

Topic: Chemistry, Ionic Equilibrium, NEET
Which of the following scientist conducted an experiment to explain the chemical evolution of life?

Options:
A Louis Pasteur
B J.B.S Haldane
C S.L Miller
D A.IOparin

The correct answer is:
S.L Miller

Solution:
The experimental proof of the chemical evolution of life was given by Stanley.L Miller in 1953 by designed an experiment that fulfilled all the conditions that were similar to primitive earth conditions.

Topic: Biology, Evolution, NEET
Which of the following scientist's contributions to viruses is correctly matched?

I. M.W. Beijerinek demonstrated that the extract of the infected plants of tobacco mosaic could cause infection in healthy plants and called the fluid as contagium vivum fluidum (infectious living fluid).
II. W.M. Stanley showed that viruses could be crystallized and crystals consist largely of proteins.
III. The name virus that means venom or poisonous fluid was given by Dmitri Ivanowsky.

Options:
A I and II
B I and III
C II and III
D I, II and III

The correct answer is:
I, II and III

Solution:
The name virus, that means venom or poisonous fluid, was given by Dmitri Ivanowsky (1892). He recognized certain microbes as the causal organisms of the mosaic disease of tobacco. These were found to be smaller than bacteria because they passed through bacteria-proof filters. M.W. Beijerinek (1898) demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants and called the fluid as contagium vivum fluidum (infectious living fluid). W.M. Stanley (1935) showed that viruses could be crystallized and crystals consist largely of proteins.

Topic: Biology, Biological Classification, NEET
Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?

Options:
A Graafian follicle
B Corpus luteum
C Foetus
D Uterus

The correct answer is:
Corpus luteum

Solution:
In the later phase of pregnancy, relaxin is secreted by the corpus luteum of the ovary and by the placenta. To facilitate childbirth, relaxin relaxes ligaments in the pelvis region and softens and widens the cervix.

Topic: Biology, Human Reproduction, NEET, NEET 2021
Which of the following secretes the hormone responsible for relaxing pubic symphysis during the childbirth?

Options:
A Pineal gland
B Macula
C Corpus albicans
D Placenta

The correct answer is:
Placenta

Solution:
Relaxin is secreted into the circulation by the corpus luteum in the ovary. During pregnancy it is also released from the placenta. There is also some evidence that relaxin can relax the ligaments at the front of the pelvis to ease delivery of the baby.

Topic: Biology, Human Reproduction, NEET
Which of the following secretes toxins during storage conditions of crop plants?

Options:
A Aspergillus
B Penicillium
C Fusarium
D Colletotrichum

The correct answer is:
Aspergillus

Solution:
Aspergillus flavus grows on stored cereal grains, groundnut and areca nut produce a carcinogenic toxin called aflatoxin.

Topic: Biology, Biotechnology and Its Applications, NEET, NEET 2002
Which of the following sectors receives high priority for development in India's economy?

Options:
A Technology and innovation
B Tourism and hospitality
C Agriculture, fisheries, and livestock
D Mining and natural resources

The correct answer is:
Agriculture, fisheries, and livestock

Solution:
India gives high priority to the development of agriculture, fisheries, and livestock sectors in its economy.

Topic: Chemistry, Environmental Chemistry, NEET
Which of the following seed characters of Pisum sativum were studied by Mendel in his hybridization experiments?

1. Seed shape
2. Seed weight
3. Seed coat colour
4. Seed starch grain size
5. Seed number

Options:
A 1 and 3
B 1, 2 and 3
C 2, 4 and 5
D 1,Â 3 and 4

The correct answer is:
1 and 3

Solution:
Mendel studied 2 seed character from the above. He studied seed shape in which round is dominant and recessive is wrinkled. In seed coat colour yellow is dominant and green is recessive.

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following selected chains is correct to name the given compound according to IUPAC system?

Options:
A The four carbon chain
B The five carbon chain
C The six carbon chain
D The seven carbon chain

The correct answer is:
The four carbon chain

Solution:
Correct Option is : (A)
The four carbon chain

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following sentences about vasa recta is correct?

Options:
A It is a part of the renal tubule.
B It is a U-shaped vessel running parallel to loop of Henle deep into the medulla in most of the nephrons.
C It originates from the afferent arteriole.
D During the counter-current mechanism, NaCl is transported back to the interstitium by the ascending portion of vasa recta.

The correct answer is:
During the counter-current mechanism, NaCl is transported back to the interstitium by the ascending portion of vasa recta.

Solution:
During the counter-current mechanism, NaCl is transported by the ascending limb of Henle’s loop which is exchanged with the descending limb of vasa recta. NaCl is returned to the interstitium by the ascending portion of vasa recta.
The efferent arteriole emerging from the glomerulus forms a fine capillary network around the renal tubule called the peritubular capillaries. A minute vessel of this network runs parallel to the Henle’s loop forming a ‘U’ shaped vasa recta. Vasa recta is absent or highly reduced in cortical nephrons.

Topic: Biology, Excretory Products and their Elimination, NEET
Which of the following sentences are true?

I. The cells of malignant tumours divide erratically.
II. More than a million Indians suffer from cancer and a large number of them die from it annually.
III. They show a property called contact inhibition.
IV. Metastasis is the most feared property of malignant tumours

Options:
A I, II and III
B II, III and IV
C I, II and IV
D I, III and IV

The correct answer is:
I, II and IV

Solution:
Cancer is one of the most dreaded diseases of human beings and is a major cause of death all over the globe. A tumour that spreads and eventually causes ill health and death are described as malignant, and this results from a breakdown of the regulatory mechanisms that govern normal cell behaviour. In the malignant tumours, the cells divide erratically and show the property of metastasis. Normal cells show a property called contact inhibition because of which, contact with other cells inhibits their uncontrolled growth. Cancer cells appear to have lost this property. As a result of this, cancerous cells just continue to divide giving rise to masses of cells called tumours.

Topic: Biology, Human Health and Diseases, NEET
Which of the following sequence is correct here?

Options:
A Tl<ln<Ga<Al (stability of +1 oxidation state)
B CO2<SiO2<SnO2<PbO2 (increasing oxidising power)
C BF3<BCl3<BBr3<Bl3 (the lewis acid strength)
D Both B and C

The correct answer is:
Both B and C

Solution:
Here both B and C are correct but A is incorrect as the correct order is
Al<Ga<ln<Tl (stability of +1 oxidation state)
As due to inert pair effect stability in lower oxidation state increases down the group.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which of the following sequence is correct with respect to the structure present in Gymnosperm?

Options:
A Strobili → Sporophylls → Sporangia → Spores
B Strobili → Sporangia → Sporophylls → Spores
C Sporophylls → Strobili → Sporangia → Spores
D Spores → Sporangia → Strobili → Cones

The correct answer is:
Strobili → Sporophylls → Sporangia → Spores

Solution:
Spore producing modified leaves are called sporophyll, which are organized around an axis is spirally to found a compact structure called strobili. Each sporophyll bears sac-like structure called sporangia and inside it spore mother cell undergoes meiosis to form haploid spores.

Topic: Biology, Plant Kingdom, NEET
Which of the following sequence is not correct for the property mentioned against it?

Options:
A BF3<BCl3<BBr3<Bl3 (the lewis acid strength)
B CO2<SiO2<SnO2<PbO2 (increasing oxidising power)
C Tlâ<âlnâ<âGaâ<âAl (stability of +1 oxidation state)
D Al < Ga < ln < Tl (stability of +1 oxidation state)

The correct answer is:
Tl < ln < Ga < Al (stability of +1 oxidation state)

Solution:
As due to inert pair effect stability of lower oxidation state increases down the group. So order given in option 3 is incorrect and the correct order is in given in option 4 here. Properties given in option 1 and 2 are in correct order.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following sequence of reactions is suitable to synthesise chlorobenzene?

Options:
A Phenol, NaNO2, HCl, CuCl
B

C

, HCI, Heating

D Benzene, Cl2, anhydrous FeCl3

The correct answer is:
Benzene, Cl2, anhydrous FeCl3

Solution:
The suitable reaction to synthesize chlorobenzene among the given options is option D.

This reaction is an example of aromatic electrophile substitution reaction.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET, NEET 2022 (Phase 1)
Which of the following sequences is correct in a hydrarch succession?

Options:
A Zooplankton, free-floating plants, reed swamp, scrub, forest
B Phytoplankton, rooted submerged plants, free-floating plants, marsh meadow, scrub, forest
C Phytoplankton, free-floating plants, marsh meadow, reed swamp, scrub, forest
D Phytoplankton, free-floating plants, rooted submerged plants, reed swamp, scrub, forest

The correct answer is:
Phytoplankton, rooted submerged plants, free-floating plants, marsh meadow, scrub, forest

Solution:
Both hydrarch and xerarch successions lead to medium water conditions (mesic): neither too dry (xeric) nor too wet (hydric).
In primary succession in water, the pioneers are the small phytoplanktons, they are replaced with time by rooted-submerged plants, rooted-floating angiosperms followed by free-floating plants, then reed swamp, marsh-meadow, scrub and finally the trees. The climax again would be a forest. With time the water body is converted into land.

Topic: Biology, Ecosystem, NEET
Which of the following sequences represent a possible pathway in the production of a secretory protein?

Options:
A Rough ER → Secretory vesicle → Ribosome → Golgi apparatus
B Ribosome → Rough ER → Golgi apparatus → Secretory vesicle
C Secretory vesicle → Golgi apparatus → Ribosomes → Rough ER
D Rough ER → Ribosomes → Secretory vesicles → Golgi apparatus

The correct answer is:
Ribosome → Rough ER → Golgi apparatus → Secretory vesicle

Solution:
Ribosome is the place where protein synthesis takes place â rough ER produces proteins and helps them fold properly â Golgi bodies does packaging of proteins â secretory vesicles does the transport of proteins.

Topic: Biology, Cell - The Unit of Life, NEET
Which of the following sequences represent the correct increasing order of bond angles in the given molecules?

Options:
A ClO2<OF2<OCl2<H2O
B OF2<H2O<OCl2<ClO2
C OCl2<ClO2<H2O<OF2
D H2O<OF2<OCl2<ClO2

The correct answer is:
OF2<H2O<OCl2<ClO2

Solution:
OF 2 =103°, H 2 O=104.5°, OCl 2 =110°, ClO 2– =111°

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following series contains electrophiles only?

Options:
A H2O,SO3,N+O2
B NH3,H2O,BI3
C AlCl3,SO3,Cl+
D ROH,NH3,N+O2

The correct answer is:
AlCl3,SO3,Cl+

Solution:
Electrophile accepts a pair of electrons. Al atom in AlCl3 has hextet; S atom in SO3 is positively charged, due to more electronegativity of O atom than S, Cl+ ion is positively charged. Hence, these species accept a pair of electron.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following series contains nucleophiles only?

Options:
A BF3,AlCl3,NH3
B RCH2-,C-N,CH3CH2OH
C BF3,N-H2,H2O
D RNH2,:CCl2,H-

The correct answer is:
RCH2-,C-N,CH3CH2OH

Solution:
As RCH2-,C-N and CH 3 CH 2 O .. .. H can donate an electron pair in a reaction so hence, all can act as nucleophiles.
BF3,AlCl3and:CCl2 all electrophiles

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following series does not falls in infrared region ?

Options:
A Balmer
B Paschen
C Brackett
D Pfund

The correct answer is:
Balmer

Solution:
Correct Option is : 1
Balmer

Topic: Chemistry, Structure of Atom, NEET
Which of the following series falls in the infrared region ?

Options:
A Lyman
B Pfund
C Balmer
D None of the above

The correct answer is:
Pfund

Solution:
Correct Option is : 2
Pfund

Topic: Chemistry, Structure of Atom, NEET
Which of the following series falls in ultra violet region ?

Options:
A Lyman
B Paschen
C Balmer
D Pfund

The correct answer is:
Lyman

Solution:
Correct Option is : 1
Lyman

Topic: Chemistry, Structure of Atom, NEET
Which of the following series falls in visible region ?

Options:
A Lyman
B Paschen
C Balmer
D Pfund

The correct answer is:
Balmer

Solution:
Correct Option is : 3
Balmer

Topic: Chemistry, Structure of Atom, NEET
Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

Options:
A Lyman series
B Balmer series
C Paschen series
D Brackett series

The correct answer is:
Balmer series

Solution:
Among the given series, lines of Balman series are the only lines in the hydrogen spectrum which appear in the visible spectrum lyman lies in the ultraviolet region while Paschen and Brackett series lie in the infrared region.

Topic: Chemistry, Structure of Atom, NEET, NEET 2019 (All India)
Which of the following set correctly represents charcateristics of family Liliaceae?

Options:
A Tricarpellary, trilocular, axile placentation, zygomorphic
B Tricarpellary, trilocular, parietal placentation, zygomorphic
C Tricarpellary, trilocular, axile placentation, actinomorphic
D Bicarpellary, trilocular, axile placentation, actinomorphic

The correct answer is:
Tricarpellary, trilocular, axile placentation, actinomorphic

Solution:
Liliaceae is a monocot family, and the flower is trimerous, thus it shows three carpels that are syncarpous and ovary is trilocular, with axile placentation.

Topic: Biology, Morphology of Flowering Plants, NEET
Which of the following set is a biopolymer of glucose?

Options:
A Glycogen, sucrose, maltose
B Glycogen, cellulose, starch
C Sucrose, inulin, pectin
D Glycogen, sucrose, lactose

The correct answer is:
Glycogen, cellulose, starch

Solution:
Glycogen, cellulose and starch are homopolymers made up of monomer glucose.

Topic: Chemistry, Biomolecules, NEET
Which of the following set is having correct statements?
1. Molecular crystals are hard in nature
2. Silicon carbide is a covalent crystal
3. Increase in radius ratio results in increase in coordination number
4. In calcium fluoride structure, coordination number of Ca2+ is 4

Options:
A 1, 2
B 2, 3
C 1, 2, 3
D 2, 3, 4

The correct answer is:
2, 3

Solution:
Molecular crystals are soft in nature so statement 1 is incorrect.
As coordination number of Ca2+ in CaF2 is 8 and that of F- is 4 so statement 4 is incorrect.
Here statement 2 and 3 are correct.
Silicon carbide (SiC) is a covalent crystaline solid.
Coordination number ∝ radius ratio.
Hint : Molecular crystals are soft.

Topic: Chemistry, Solid State, NEET
Which of the following set is not an example of divergent evolution?

Options:
A Vertebrate hearts or brains
B Marsupials and Darwin finches
C Sweet potato and potato
D Forelimbs of vertebrates

The correct answer is:
Sweet potato and potato

Solution:
Analogous structures are a result of convergent evolution - different structures evolving for the same function and hence having similarity. Sweet potato (root modification) and potato (stem modification) is an example for analogy, as their common function is storage of food.

Topic: Biology, Evolution, NEET
Which of the following set of animals are triploblastic, true coelomates with open type circulatory system?

Options:
A Earthworm, Cockroach, Nereis
B Cockroach, Octopus, Leech
C Mosquito, Pheretima, Nereis
D Cockroach, Leech, Pila

The correct answer is:
Cockroach, Leech, Pila

Solution:
Open circulatory system also called Haemocoel is present in Arthropoda- Cockroach, mosquito, honey bee, etc.
Hirudinaria of Annelida -Blood sucking Leeches.
Non-cephalopode Molluscs- Pila, Unio, Dentalium

Topic: Biology, Animal Kingdom, NEET