datavorous/entrance-exam-dataset huggingface dataset:
Why were the bacteria infected with viruses that had radioactive protein not radioactive?

Options:
A Because the viral coats were not removed from the bacteria
B Because proteins did not enter the bacteria from the viruses
C Because RNA entered the bacteria from the viruses
D Because the viruses were not grown on radioactive sulfur

The correct answer is:
Because proteins did not enter the bacteria from the viruses

Solution:
Bacteria that were infected with viruses that had radioactive proteins were not radioactive. This indicates that proteins did not enter the bacteria from the viruses.

Topic: Biology, Molecular Basis of Inheritance, NEET
Why were the earliest systems of classification considered artificial?

Options:
A They were based on natural affinities among the organisms
B They gave equal weightage to vegetative and sexual characteristics
C They separated closely related species
D They used only gross superficial morphological characters

The correct answer is:
They gave equal weightage to vegetative and sexual characteristics

Solution:
The earliest systems of classification within angiosperms were considered artificial because they gave equal weightage to vegetative and sexual characteristics, which is not acceptable since vegetative characters are more easily affected by the environment.

Topic: Biology, Plant Kingdom, NEET
Why were transition metals originally named as such?

Options:
A Because they have full d subshells.
B Because their chemical properties are transitional.
C Because they belong to group 12.
D Because they are in the s-block of the periodic table.

The correct answer is:
Because their chemical properties are transitional.

Solution:
The paragraph explains that the name "transition metals" was originally derived from the fact that their chemical properties were transitional between those of s and p-block elements.

Topic: Chemistry, d and f Block Elements, NEET
Why were two species of sugarcane crossbred?

Options:
A To get high yield
B To get thick stems
C To get high sugar content
D To combine all the desirable qualities of high yield, thick stems, high sugar and ability to grow in the sugar cane areas of North India

The correct answer is:
To combine all the desirable qualities of high yield, thick stems, high sugar and ability to grow in the sugar cane areas of North India

Solution:
Two species of sugarcane, Saccharum barberi and Saccharum officinarum, were successfully crossbred to get sugarcane varieties combining all the desirable qualities.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
Why would a cation with a greater positive charge have a smaller radius?

Options:
A Because of greater electron repulsion
B Because of greater attraction of electrons to the nucleus
C Because of fewer electrons
D Because of fewer protons

The correct answer is:
Because of greater attraction of electrons to the nucleus

Solution:
A cation with a greater positive charge will have a smaller radius because of the greater attraction of the electrons to the nucleus.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Why would an anion with a greater negative charge have a larger radius?

Options:
A Because of greater electron repulsion
B Because of greater attraction of electrons to the nucleus
C Because of fewer electrons
D Because of fewer protons

The correct answer is:
Because of greater electron repulsion

Solution:
An anion with a greater negative charge will have a larger radius because the net repulsion of the electrons will outweigh the nuclear charge.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Why would the Earth be inhospitably cold without its atmosphere?

Options:
A Because the atmosphere traps heat radiation from the sun.
B Because the atmosphere contains greenhouse gases.
C Because the atmosphere reflects sunlight away.
D Because the atmosphere contains oxygen.

The correct answer is:
Because the atmosphere traps heat radiation from the sun.

Solution:
Correct Option is : (A)
Because the atmosphere traps heat radiation from the sun.

Topic: Chemistry, Thermal Properties of Matter, NEET
Widal test is carried out to test

Options:
A malaria
B diabetes mellitus
C HIV/AIDS
D typhoid fever

The correct answer is:
typhoid fever

Solution:
Widal test is one of the most over utilized diagnostic tests for typhoid fever in developing countries ever since its introduction over 100 years ago. This test demonstrates the presence of somatic $(O)$ and flagellar $(\mathrm{H})$ agglutinins to Salmonella typhi in the patients serum using suspensions of $\mathrm{O}$ and $\mathrm{H}$ antigens. Antigens of S. paratyphi A and S. paratyphi B are included in most commercial kits.

Topic: Biology, Human Health and Diseases, NEET, NEET 2012 (Screening)
WIDAL test is used for the detection of

Options:
A Disease caused by a protozoan called Trichomonas
B Disease caused by a rod shaped bacterium called Salmonella typhi
C Disease caused by a spherical bacterium called N. gonorrhoea
D Disease caused by a spiral bacterium called Treponema pallidum

The correct answer is:
Disease caused by a rod shaped bacterium called Salmonella typhi

Solution:
WIDAL test is used for the detection of typhoid in humans, also known as enteric fever It is caused by a rod-shaped bacterium known as Salmonella typhi.

Topic: Biology, Human Health and Diseases, NEET
Widal test is used for the diagnosis of

Options:
A malaria
B pneumonia
C tuberculosis
D typhoid

The correct answer is:
typhoid

Solution:
Widal test is bacterial agglutination test, originally introduced by Widal for diagnosis of typhoid fever. Widal test is based upon antigen antibody serological interactions. Typhoid or enteric fever is caused by a Gram-negative bacterium Salmonella commonly found in human intestine. Infection of typhoid bacteria stimulates the production of immuno-specific agglutinins, which are released in blood plasma.

Topic: Biology, Human Health and Diseases, NEET, NEET 2010 (Screening)
Widal test is used for the susceptibility of:

Options:
A Malaria
B Cholera
C Yellow fever
D Typhoid

The correct answer is:
Typhoid

Solution:
The WIDAL test is one of the presumptive diagnostic methods of enteric fever/typhoid fever. WIDAL test detects the presence of agglutinins to O and H antigens of Salmonella typhi and Salmonella paratyphi in the serum of patients with suspected Salmonella infection.

Topic: Biology, Human Health and Diseases, NEET
Widespread infection of which of the following disease can't be controlled by the use of larvivorous fish like Gambusia?

Options:
A Malaria
B Chikungunya
C Ringworm
D Dengue

The correct answer is:
Ringworm

Solution:
Diseases such as malaria, dengue, chikungunya and filariasis that are transmitted through insect vectors, the most important measure is to control or eliminate the vectors and their breeding places. This can be achieved by introducing fishes like Gambusia in ponds that feed on mosquito larvae.

Topic: Biology, Human Health and Diseases, NEET
Will CCl4give white precipitate of AgCl on heating it with silver nitrate?

Options:
A Yes
B No
C Yes but it will give a precipitate of black colour
D Cannot be discussed without further information

The correct answer is:
No

Solution:
Correct Option is : (B)
No

Topic: Chemistry, General Organic Chemistry, NEET
Will microbes become acceptable as food?

Options:
A Yes
B No
C Partially
D Not sure

The correct answer is:
Yes

Solution:
The fact that mushrooms are eaten by many people and large scale mushroom culture is a growing industry makes it believable that microbes too would become acceptable as food.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
will respond to

Options:
A Only Fehling solution
B Only Tollen’s reagent
C Both Tollen’s reagent and Fehling solution
D none of these

The correct answer is:
Both Tollen’s reagent and Fehling solution

Solution:
Alpha hydroxy ketone can give test with both Tollen’s reagent and Fehling solution

Topic: Chemistry, Aldehydes and Ketones, NEET
Will the focal length of a lens for red light be more, same, or less than that for blue light?

Options:
A More
B Same
C Less
D Cannot be determined

The correct answer is:
Less

Solution:
Correct Option is : (C)
Less

Topic: Chemistry, Ray Optics, NEET
Will the reaction between the functional isomers of a carbonyl compound with molecular formula C3H6O and HCN lead to the completion with the conversion of whole reactant into product at reaction conditions? and If a strong acid is added to the reaction mixture what will be the effect on concentration of the product and why?

Options:
A No, It is a reversible reaction. Hence equilibrium is established. Addition of acid inhibits the reaction because the formation of –CN ions is prevented
B No, It is a reversible reaction. Hence equilibrium is established. Addition of acid enhances the reaction because the formation of –CN ions is accelerated.
C No, It is an irreversible reaction. Hence equilibrium is not established. Addition of acid inhibits the reaction because the formation of –CN ions is prevented
D Yes, It is an irreversible reaction. Hence equilibrium is established. Addition of acid enhances the reaction because the formation of –CN ions is accelerated.

The correct answer is:
No, It is a reversible reaction. Hence equilibrium is established. Addition of acid inhibits the reaction because the formation of –CN ions is prevented

Solution:
Correct Option is : (A)
No, It is a reversible reaction. Hence equilibrium is established. Addition of acid inhibits the reaction because the formation of –CN ions is prevented

Topic: Chemistry, Aldehydes and Ketones, NEET
Will use of liquefied carbon dioxide with detergent be completely safe from the point of view of pollution? Explain.

Options:
A Yes, because carbon dioxide is a natural and non-polluting substance.
B No, because most of the detergents are non-biodegradable and they cause water pollution. Moreover, liquefied CO2will ultimately enter the atmosphere and contributed to the greenhouse effect.
C Yes, because the use of liquefied carbon dioxide eliminates the need for other polluting chemicals in detergents.
D No, because liquefied carbon dioxide cannot contaminate groundwater when used in conjunction with detergents.

The correct answer is:
No, because most of the detergents are non-biodegradable and they cause water pollution. Moreover, liquefied CO2will ultimately enter the atmosphere and contributed to the greenhouse effect.

Solution:
Correct Option is : (B)
No, because most of the detergents are non-biodegradable and they cause water pollution. Moreover, liquefied CO2will ultimately enter the atmosphere and contributed to the greenhouse effect.

Topic: Chemistry, Environmental Chemistry, NEET
Wilting occurs in plants irrigated in soil having excessive salts due to

Options:
A endosmosis.
B exosmosis.
C imbibition.
D None of these

The correct answer is:
exosmosis.

Solution:
Excessive use of fertilizers causes exosmosis as the outer medium will become hypertonic. In such a condition, osmotic withdrawal of water from all parts of plant takes place. This kind of loss of water causes wilting in plants.

Topic: Biology, Transport in Plants, NEET
Wind pollination is common in

Options:
A lilies
B grasses
C orchids
D legumes

The correct answer is:
grasses

Solution:
Pollination by wind (anemophily) is more common amongst abiotic pollinations. Wind pollination is quite common in grasses.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET, NEET 2011 (Screening)
Wind pollination or anemophily is found in

Options:
A Salvia
B orchids
C coconuts
D Vallisneria

The correct answer is:
coconuts

Solution:
Pollination by wind is called wind pollination or anemophily where wind helps in dispersal of pollen grains.
Common anemophilous plants are oaks, coconut, sweet chestnuts and all members of Gymnosperms.
Salvia is pollinated by insects and bottle brush by bees and moths. Vallisneria is pollinated by water.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Wine is prepared by fermentation of grape juice by

Options:
A Bacillus liquifaciens
B Penicillium roqueforti
C Saccharomyces cerevisiae
D Streptococcus aureus

The correct answer is:
Saccharomyces cerevisiae

Solution:
Saccharomyces cerevisiae is a species of yeast. It has been instrumental to winemaking, baking, and brewing since ancient times. It is believed to have been originally isolated from the skin of grapes.

Topic: Biology, Microbes in Human Welfare, NEET
Wine turns sour because of

Options:
A Heat
B Aerobic bacteria
C Anaerobic bacteria
D Exposure to light

The correct answer is:
Aerobic bacteria

Solution:
When the wine is exposed to air, the contamination by aerobic bacteria Acetobacter aceti results in the production of acetic acid and wine turns sour.

Topic: Biology, Microbes in Human Welfare, NEET
Winged pollen grains are present in

Options:
A Mango
B Cycas
C Mustard
D Pinus

The correct answer is:
Pinus

Solution:
In Pinus, winged pollen grains are present. It is extended outer exine on two lateral sides to form the wings of pollen. It is the characteristic feature, only in Pinus. Pollen grains of mustard, Cycas & mango are not winged shaped.

Topic: Biology, Plant Kingdom, NEET, NEET 2018
Wings of pigeon, bat and mosquito shows

Options:
A atavism.
B convergent evolution.
C divergent evolution.
D mutation.

The correct answer is:
convergent evolution.

Solution:
Wings of pigeon, bat and mosquito perform same function (flying) but have evolved from separate ancestral populations. This similarity developed in distantly related groups as an adaptation for same function is called convergent evolution.

Topic: Biology, Evolution, NEET
Wings of the bat, locust and pigeon are an example of

Options:
A Vestigeal organs
B Exoskeletal structures
C Homologous organs
D Analogous organs

The correct answer is:
Analogous organs

Solution:
The wings of bat, locust and pigeon perform the same function but have different origin and histology.

Topic: Biology, Evolution, NEET
Wires 1 and 2 carrying currents i1 and i2 respectively are inclined at an angle Î¸ to each other. What is the force on a small element dl of wire 2 at a distance of r from wire 1 (as shown in the figure) due to the magnetic field of wire 1?

Options:
A μ02πri1i2 dltan⁡θ
B μ02πri1i2 dlsin⁡θ
C μ02πr i1i2 dlcos⁡θ
D μ04πr i1i2 dlsin⁡θ

The correct answer is:
μ02πr i1i2 dlcos⁡θ

Solution:
Length of the component dl which is parallel to wire [1] is dlcos⁡θ, so force on it.
F=μ02πi1i2rdlcos⁡θ

Topic: Physics, Magnetic Effects of Current, NEET
With forward bias mode, the p-n junction diode

Options:
A is one in which width of depletion layer increases
B is one in which potential barrier increases
C acts as closed switch
D acts as open switch

The correct answer is:
acts as closed switch

Solution:
âWhen a p-n junction is in forward bias, it allows current to flow through it with minimal resistance, hence we can say, it acts like a closed switch

Topic: Physics, Semiconductors, NEET
With forward bias mode, the p-n junction diode

Options:
A is one in which width of depletion layer increases
B is one in which potential barrier increases
C acts as closed switch
D acts as open switch

The correct answer is:
acts as closed switch

Solution:
âWhen a p-n junction is in forward bias, it allows current to flow through it with minimal resistance.
Hence we can say, it acts like a closed switch

Topic: Physics, Semiconductors, NEET
With reference to different structures of the human brain, which one is an incorrect match?

Options:
A Thalamus : Major co-ordinating centre for sensory and motor signalling.
B Association area :Resp onsible for complex functions like intersensory associations, memory and communication.
C Medulla oblongata : Controls respiration, cardiovascular reflexes, excitement and urge for eating and drinking.
D Limbic system : Alongwith the hypothalamus, it is involved in the regulation of sexual behaviour and expression of emotions.

The correct answer is:
Medulla oblongata : Controls respiration, cardiovascular reflexes, excitement and urge for eating and drinking.

Solution:
Medulla oblongata of hind brain contains centres which control respiration, cardiovascular reflexes, gastric secretion and vomiting. Hypothalamus of fire brain contains a number of centres which control body temperature, urge for eating and drinking.

Topic: Biology, Neural Control and Coordination, NEET
With reference to enzymes, turn over number means

Options:
A The number of substrate molecules that a molecule of an enzyme converts into products per hour
B The number of substrate molecules that a molecule of an enzyme converts into products per second
C The number of substrate molecules that a molecule of an enzyme convert into products per minute
D The number of substrate molecules that a molecule of an enzyme converts into products per day

The correct answer is:
The number of substrate molecules that a molecule of an enzyme convert into products per minute

Solution:
The number of substrate molecules changed per minute by a molecule or enzyme is called turn over number. The higher the turn-over number, the more efficient an enzyme is. It depends upon the number of active points present over an enzyme, precise collisions between reactants and the rate of removal of end products.

Topic: Chemistry, Biomolecules, NEET
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

Options:
A Light saturation for CO2 fixation occurs at 10% of full sunlight
B Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate
C C3 plants respond to higher temperatures with enhanced photosynthesis, while C4 plants have a much lower temperature optimum
D Tomato is a greenhouse crop that can be grown in CO2 - enriched atmosphere for a higher yield

The correct answer is:
C3 plants respond to higher temperatures with enhanced photosynthesis, while C4 plants have a much lower temperature optimum

Solution:
In C3 plants, photosynthesis is decreased at higher temperatures due to increased photorespiration. C4 Plants have a higher temperature optimum because of the presence of pyruvate phosphate dikinase enzyme, which is sensitive to low temperature.

Topic: Biology, Photosynthesis in Higher Plants, NEET, NEET 2017
With reference to Hershey and Chase experiments. Select the correct statements.
(A) Viruses grown in the presence of radioactive phosphorus contained radioactive DNA.
(B) Viruses grown on radioactive sulphur contained radioactive proteins.
(C) Viruses grown on radioactive phosphorus contained radioactive protein.
(D) Viruses grown on radioactive sulphur contained radioactive DNA.
(E) Viruses grown on radioactive protein contained radioactive DNA.
Choose the most appropriate answer from the options given below :

Options:
A $(A)$ and $(C)$ only
B $(B)$ and $(D)$ only
C $(D)$ and $(E)$ only
D $(A)$ and $(B)$ only

The correct answer is:
$(A)$ and $(B)$ only

Solution:
In Hershey and Chase experiment, after centrifugation the bacterial cells showed the presence of a radioactive DNA labelled with $\mathrm{P}^{32}$ while radioactive protein labelled with $\mathrm{S}^{35}$ appeared outside the bacterial cell i.e. in the medium.
Labelled DNA was also found in the next generation of phage. Bacteria that were infected with viruses that had radioactive protein were not radioactive.
Statement A and B are correct.
Hence option (4) is correct.

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2023 (Manipur)
With reference to taxonomical aids, correct statements are

A. Each statement in the key is called a couplet.
B. Herbarium is a storehouse of collected plant and animal specimens.
C. Separate taxonomic keys are required for each taxonomic category.
D. Keys are used for identification purposes.

Options:
A A and B
B A and D
C A and C
D C and D

The correct answer is:
C and D

Solution:
Key is a type of taxonomical aid that is used for the identification of both plants and animals based on the similarities and dissimilarities. Usually, for each taxonomic category like species, genus, family, etc., separate taxonomic keys are required.
Each statement in the key is called Lead while a pair of keys based on contrasting characters is called a couplet. The herbarium is a store house of collected plant specimens that are dried, pressed and preserved on sheets.

Topic: Biology, The Living World, NEET
With reference to which classification has the statement, “ranitidine is an antacid” been given?

Options:
A Based on chemical composition.
B Based on the mechanism of action.
C Based on the brand name.
D Based on the availability.

The correct answer is:
Based on the mechanism of action.

Solution:
Correct Option is : (B)
Based on the mechanism of action.

Topic: Chemistry, Chemistry in Everyday Life, NEET
With regard to insulin choose correct options.

(a) C-peptide is not present in mature insulin.

(b) The insulin produced by rDNA technology has C-peptide.

(c) The pro-insulin has C-peptide.

(d) A-peptide and B-peptide of insulin are interconnected by disulphide bridges.

Options:
A (b) and (d) only
B (b) and (c) only
C (a), (c) and (d) only
D (a) and (d) only

The correct answer is:
(a), (c) and (d) only

Solution:
Insulin is a protein hormone that is composed of two chains, an A-chain having 21 amino acids and a B-chain having 30 amino acids, linked together by disulphide bonds (S-S). Insulin is derived from a 74-amino acid prohormone molecule called proinsulin having C-peptide and this is removed before the processing of mature insulin and during the production of recombinant insulin, the two chains were separately produced and then linked with each other. C-peptide is absent in mature insulin.

Topic: Biology, Biotechnology and Its Applications, NEET, NEET 2021
With regard to mature mRNA in eukaryotes:

Options:
A exons and introns do not appear in the mature RNA
B exons appear but introns do not appear in the mature RNA
C introns appear but exons do not appear in the mature RNA
D both exons and introns appear in the mature RNA

The correct answer is:
exons appear but introns do not appear in the mature RNA

Solution:
Exons appear but introns do not appear in the mature RNA due to splicing of the introns.

Topic: Biology, Molecular Basis of Inheritance, NEET
With respect to atomic spectrum, each line in the Lyman series is due to electrons returning

Options:
A from a particular higher energy lever to n = 3
B from a particular higher energy level to n = 2
C from a particular higher energy level to n = 1
D from a particular higher energy level to n = 4

The correct answer is:
from a particular higher energy level to n = 1

Solution:
Lyman series: From n = 2, 3, 4, 5 ..... to n = 1.
In case of Balmer series, Paschen series, Bracket series the value of ground states are 2, 3, 4 respectively.

Topic: Chemistry, Structure of Atom, NEET
With respect to bacterial pilus, which of the following statements is not true?

Options:
A They are made up of pilin protein.
B They are shorter than flagella.
C They help in genetic recombination.
D They play an important role in movement.

The correct answer is:
They play an important role in movement.

Solution:
Pilus or pili are surface structures of the bacteria but do not play a role in motility. The pili are elongated tubular structures made up of a special protein. In some bacteria, they are known to help attach the bacteria to rocks in streams and also to the host tissues.

Topic: Biology, Cell - The Unit of Life, NEET
With respect to blood groups, the person having ______ blood group is definitely heterozygous.

Options:
A A
B B
C AB
D O

The correct answer is:
AB

Solution:
ABO blood group system is controlled by 3 different alleles IA, IB and i. A person with blood group A may have genotypes IAIA or IAi . The person with blood group B may have genotypes IBIB or IBi . The person with blood group O has genotype ii. Person with blood group AB has genotype IAIB, so the person is definitely heterozygous.

Topic: Biology, Principles of Inheritance and Variation, NEET