datavorous/entrance-exam-dataset huggingface dataset:
Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example.

Options:
A colour change in chameleon
B enlargement of body size by swallowing air in puffer fish
C poison fangs in snakes
D melanism in moths.

The correct answer is:
poison fangs in snakes

Solution:
Colour change in chameleon and melanism in moths are examples of camouflage in animals adapted to prevent predation from prey. As a defence mechanism puffers have the ability to inflate rapidly, filling their extremely elastic stomach with water (or air) until they are almost spherical. This prevents them from being identified by the predator. But poison fangs in snakes are a method adopted for preying and not escaping predation.
Related Theory
Prey species have defense adaptations that help them escape predation. These defenses may be mechanical, chemical, physical, or behavioural. Camouflage is the ability of an organism to blend in with its surroundings.
It can be as simple as being the predominant colour of surrounding vegetation, or it can define an organism's complete morphology, like this walking stick. It is considered as a great defensive strategy, as evidenced by its widespread use in nature.

Topic: Biology, Organisms and Populations, NEET, NEET 2005
Animals that can tolerate a narrow range of salinity are

Options:
A Stenohaline
B Euryhaline
C Exohaline
D Endohaline

The correct answer is:
Stenohaline

Solution:
Stenohaline: Steno means narrow, and haline means salt. A fish cannot handle a wide fluctuation in salt content in water. Many fresh water fishes tend to be stenohaline and die in environments of high salinity, such as oceans. Fish living in coastal estuaries and tide pools are often euryhaline (tolerant to changes in salinity) as they have life cycle requiring tolerance for both freshwater and seawater environments, e.g., Salmon.

Topic: Biology, Organisms and Populations, NEET
Animals which possess collar cells and an osculum as characteristic features belong to phylum:

Options:
A Cnidaria
B Echinodermata
C Ctenophora
D Porifera

The correct answer is:
Porifera

Solution:
Members of phylum Porifera are commonly known as sponges. Sponges have a water transport or canal system. Water enters through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the osculum. Choanocytes or collar cells line the spongocoel and the canals.

Topic: Biology, Animal Kingdom, NEET
Anisogamous condition is seen in

Options:
A Spirogyra
B Volvox
C Fucus
D Chlamydomonas

The correct answer is:
Chlamydomonas

Solution:
Sexual reproduction takes place through the fusion of two gametes. These gametes can be flagellated and similar in size (as in Ulothrix) or non-flagellated (non-motile) but similar in size (as in Spirogyra). Such reproduction is called isogamous. The fusion of two gametes dissimilar in size, as in species of Chlamydomonas is termed as anisogamous. The fusion between one large, nonmotile (static) female gamete and a smaller, motile male gamete is termed oogamous, e.g., Volvox, Fucus.

Topic: Biology, Plant Kingdom, NEET
Anisole on cleavage with HI gives

Options:
A
B
C
D

The correct answer is:

Solution:
Anisole is methoxy benzene. Anisole reacts with protons from hydroiodic acid to form methyl(phenyl) oxonium ion.
In the methyl(phenyl)oxonium ion, the oxygen atom has a positive charge. This positive charge is delocalised through resonance with the benzene ring. Due to this, the bond between the oxygen atom and the aromatic carbon atom of benzene has a partial double bond character. This bond is difficult to break. Hence, the iodide ion does not attack the aromatic carbon atom of the benzene ring. On the other hand, the bond between the oxygen atom and the carbon atom of the methyl group is a single bond. This bond can be easily broken.
Hence, the iodide ion attacks the carbon atom of the methyl group to form phenol and iodomethane.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET, NEET 2020 (Phase 1)
Anisole on reaction with chloromethane in presence of anhydrous AlCl3 gives

Options:
A o-methyl anisole and p-methoxy anisole
B p-methyl anisole and p-methoxy anisole
C o-methyl anisole and p-methyl anisole
D o-methoxy acetophenone and p-methoxy acetophenone

The correct answer is:
o-methyl anisole and p-methyl anisole

Solution:
Anisole on reaction with chloromethane in presence of anhydrous AlCl3 gives o-methyl anisole and p-methyl anisole.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Anisole reacts with HI to give

Options:
A phenol and methyl iodide
B iodobenzene and methanol
C iodobenzene and methyl iodide
D phenol and methanol

The correct answer is:
phenol and methyl iodide

Solution:
Anisole reacts with HI to give phenol and methyl iodide.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Annual migration does not occur in the case of:

Options:
A arctic tern
B salmon
C siberian crane
D salamander

The correct answer is:
salamander

Solution:
Migration can be defined as the relatively long-distance movement of individuals, usually on a seasonal basis. It is found in all major groups and in the case of aquatic animals, it is generally found in marine animals and amphibians (like Salamander) don't live in sea water and hence don't migrate.

Topic: Biology, Animal Kingdom, NEET, NEET 2006
Another name for the wrist bones is

Options:
A metacarpals
B carpals
C phalanges
D tarsals

The correct answer is:
carpals

Solution:
The bones of the hand are arranged in groups. The carpals, or the bones which enter into the formation of the wrist, are short bones. The metacarpals form the skeleton of the' palm of the hand and are long bones. The phalanges, or bones of the fingers, are long bones.

Topic: Biology, Locomotion and Movement, NEET
Anoxygenic photosynthesis is characteristic of:

Options:
A Rhodospirillum
B Spirogyra
C Chlamydomonas
D Ulva

The correct answer is:
Rhodospirillum

Solution:
The photosynthetic bacteria respire without oxygen. No oxygen is evolved in bacterial photosynthesis. Water is not used as a source of reducing power. Instead, hydrogen is obtained either directly or from various types of inorganic and organic compounds, e.g., H2âS, aliphatic compounds. Anoxygenic photosynthesis is characteristic of Rhodospirillum. It is a non-oxygenic photosynthetic bacteria.

Topic: Biology, Biological Classification, NEET, NEET 2014
Antennary glands of crustaceans are meant for

Options:
A Excretion
B Respiration
C Digestion
D Circulation

The correct answer is:
Excretion

Solution:
The excretory system of crustacean (like prawns) consists of a pair of antennary or green glands, a pair of lateral ducts, and an unpaired renal or nephroperitoneal sac.

Topic: Biology, Excretory Products and their Elimination, NEET
Antherozoids in the given figure E represent

Options:
A Male gametophyte
B Photosynthetic sporophyte
C Female gametophyte
D Motile male gametes

The correct answer is:
Motile male gametes

Solution:
An antheridium is a haploid structure or organ producing and containing male gametes (called antherozoids or sperm). The plural form is antheridia, and a structure containing one or more antheridia is called an androecium. "Androecium" is also used as the collective term for the stamens of flowering.

Topic: Biology, Plant Kingdom, NEET
Antherozoids of both Funaria and Pteris were released together near the archegonia of Pteris. Only its sperms enter the archegonia as

Options:
A Pteris archegonia repel Funaria sperms
B Funaria sperms get killed by Pteris sperms
C Funaria sperms are less mobile
D Pteris archegonia release chemical to attract its sperms

The correct answer is:
Pteris archegonia release chemical to attract its sperms

Solution:
Archegonia of a particular species recognize antherozoids (sperms) of the same species through the release of chemicals. In Pteris, archegonia produce malic acid which attracts sperms of Pteris only for fertilization.

Topic: Biology, Plant Kingdom, NEET
Anthesis is a phenomenon which refers to:

Options:
A reception of pollen by stigma
B formation of pollen
C development of anther
D opening of flower bud.

The correct answer is:
opening of flower bud.

Solution:
Anthesis is the period during which a flower is fully open and functional. It is also called efflorescence.
Related Theory
In emasculation technique the stamens are removed before anthesis to obtain female parent and pollen from the desired male parent is transferred on to its stigma.

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2004
Antibiotics are usually not given for an ______ infection, as they may worsen the disease process.

Options:
A Escherichia coli
B Streptococcus
C Pseudomonas aeruginosa
D Salmonella typhii

The correct answer is:
Escherichia coli

Solution:
E.coli is a prokaryote as it is a bacterium. Escherichia coli, is a type of bacteria that normally lives in the intestines. Itâs also found in the gut of some animals. Most types of E. coli are harmless and even help keep your digestive tract healthy. But some strains can cause diarrhea if you eat contaminated food or drink fouled water. The treatment for the infection is to drink plenty of fluids to avoid dehydration and to get as much rest as possible. Antibiotics are usually not given for this infection, as they may worsen the disease process.

Topic: Biology, Cell - The Unit of Life, NEET
Antibiotics have greatly improved our capacity to treat deadly diseases such as

Options:
A plague, whooping cough, polio
B plague, polio, AIDS, whooping cough, diphtheria and leprosy
C plague, AIDS, whooping cough, diphtheria
D whooping cough, diphtheria and leprosy

The correct answer is:
whooping cough, diphtheria and leprosy

Solution:
Whooping cough is also called pertussis. It is a contagious bacterial disease that is caused by bacteria.e.Bordetella pertussis. Diphtheria is caused by bacteria i.e. Corynebacterium diphtheriae and that is also contagious. This bacteria usually affects the throat and nose mucous membrane. Leprosy is caused by bacteria i.e. Mycobacterium leprae and it is also a communicable disease. There is a substance derived from microorganisms that destroy the growth of microorganisms. So the correct answer is D. In others options viral disease is present like AIDS and Polio.

Topic: Biology, Microbes in Human Welfare, NEET
Antibodies in our body are complex:

Options:
A glycoproteins
B lipoproteins
C steroids
D prostaglandins

The correct answer is:
glycoproteins

Solution:
Antibodies, also referred to as immunoglobulins, are glycoproteins naturally produced in response to invading foreign particles (antigens) such as microorganisms and viruses. They play a critical role in the immune system's defense against infection and disease.

Topic: Biology, Human Health and Diseases, NEET, NEET 2006
Antibody molecule is represented as:

Options:
A H1L3
B H3L1
C H2L2
D H2L1

The correct answer is:
H2L2

Solution:
Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Hence, an antibody is represented as H2 L2 .

Topic: Biology, Human Health and Diseases, NEET
Antibody molecule is Y shaped. The two tips of this Y shaped molecule bind to antigen through which type of interaction/bond?

Options:
A Non-covalent interaction
B Disulfide bonds
C Covalent interaction
D Peptide bond

The correct answer is:
Non-covalent interaction

Solution:
The typical structure of immunoglobulin or antibody is Y shaped and is represented as H2L2. This means it consists of two heavy chains and two light chains. These chains are polypeptide chains and because of difference in weights one is termed as heavy and other is termed as light. Both these chains are linked by disulphide bonds. Each chain consists of two regions: constant region or FC i.e. fragment crystallizable and variable region or Fab i.e. fragment for antigen-binding region. Thus the variable region consists of antigen-binding site that is a part of heavy and light chains. Antigens are attached to antibodies through non-covalent bonds.

Topic: Biology, Human Health and Diseases, NEET
Anticeptic chloroxylenol is

Options:
A 4-chloro-3, 5-dimethylphenol
B 3-chloro-4, 5-dimethylphenol
C 4-chloro-2, 5-dimethylphenol
D 5-chloro-3, 4-dimethylphenol

The correct answer is:
4-chloro-3, 5-dimethylphenol

Solution:

Topic: Chemistry, Chemistry in Everyday Life, NEET
Antigenic determinant sites bind to which portions of an antibody molecule?

Options:
A Light chains
B Heavy chains
C Intermediate chains
D Both light chains and heavy chains

The correct answer is:
Both light chains and heavy chains

Solution:
Antigenic determinant sites bind to both Light chains and Heavy chains portions of an antibody molecule, at the variable regions.

Topic: Biology, Human Health and Diseases, NEET
Antihistamine pills are to nullify

Options:
A Allergic reaction
B Malaria
C Typhoid
D None of above

The correct answer is:
Allergic reaction

Solution:
The exaggerated response of the immune system to certain allergens present in the environment is called allergy. The IgE antibodies are produced by the release of chemicals like histamine and serotonin from the mast cells. The use of drugs like anti-histamine, adrenalin, and steroids quickly reduces the symptoms of allergy.

Topic: Biology, Human Health and Diseases, NEET
Anti-Markownikov addition of HBr is not observed in

Options:
A propane
B but-1-ene
C but-2-ene
D pent-2-ene

The correct answer is:
but-2-ene

Solution:
Both carbons of double bond have equal number of hydrogens and thus, it is a symmetrical alkene.
Hence, anti-Markownikov rule cannot be applied in but-2-ene..

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Antiparallel strands in DNA is due to

Options:
A Disulphide linkage
B Hydrogen bond
C Phosphodiester bond
D Glycosidic bond

The correct answer is:
Phosphodiester bond

Solution:
A single DNA strand has two ends: one end has 5’-phosphate group and other has 3’-OH group. The DNA chains are arranged in such a way that you can never have two 5’ (five prime) or 3’ (three prime) at one end. This arrangement is called antiparallel because the strands run in opposite directions to each other.
The backbone of each polynucleotide strand consists of deoxyribose sugar alternating with phosphate groups that links the 3' carbon of one sugar to 5' carbon of next.

Topic: Biology, Molecular Basis of Inheritance, NEET
Antiparallel strands of a DNA molecule means that:

Options:
A one strand turns clockwise
B one strand turns anti-clockwise
C the phosphate groups of two DNA strands, at their ends, share the same position
D the phosphate groups at the start of two DNA strands are in opposite position (pole)

The correct answer is:
the phosphate groups at the start of two DNA strands are in opposite position (pole)

Solution:
The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in the opposite directions. One polynucleotide chain grows in the $5^{\prime} \rightarrow 3^{\prime}$-direction and the other chain grows in the $3^{\prime} \rightarrow 5^{\prime}$ direction.

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2006
Antiretroviral drugs are useful in the treatment of

Options:
A an RNA-containing viral-borne disease
B IgE mediated allergy
C autoimmune disorders which affect joints
D deficiency disease

The correct answer is:
an RNA-containing viral-borne disease

Solution:
Antiretroviral treatment (also known as antiretroviral therapy or ART) consists of drugs that treat HIV. Taking ART, people with HIV can live long and healthy lives.

Topic: Biology, Human Health and Diseases, NEET
Antiseptic chloroxylenol is

Options:
A 4-chloro-3,5-dimethylphenol
B 3-chloro-4,5-dimethylphenol
C 4-chloro-2,5-dimethylphenol
D 5-chloro-3,4-dimethylphenol

The correct answer is:
4-chloro-3,5-dimethylphenol

Solution:
Antiseptic chloroxylenol is 4-chloro-3, 5-dimethylphenol

Topic: Chemistry, Chemistry in Everyday Life, NEET
Antiseptic chloroxylenol is

Options:
A 4-chloro-3, 5-dimethylphenol
B 3-chloro-4, 5-dimethylphenol
C 4-chloro-2, 5-dimethylphenol
D 5-chloro-3, 4-dimethylphenol

The correct answer is:
4-chloro-3, 5-dimethylphenol

Solution:

Topic: Chemistry, Chemistry in Everyday Life, NEET
Antiseptics and disinfectants either kill or prevent growth of microganisms. Identify which of the following statements is not true?

Options:
A Chlorine and iodine are used as strong disinfectants.
B Dilute solutions of Boric acid and hydrogen Peroxide are strong antiseptics.
C Disinfectants harm the living tissues.
D A 0.2 % solution of phenol is an antiseptic while 1% solution acts as a disinfectant.

The correct answer is:
Dilute solutions of Boric acid and hydrogen Peroxide are strong antiseptics.

Solution:
As dilute solutions of boric acid and hydrogen peroxide are mild antiseptics so option (B) is wrong. Rest options are correct.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Antivenom against snake poison contains:

Options:
A Antigens
B Antigen-antibody complexes
C Antibodies
D Enzymes

The correct answer is:
Antibodies

Solution:
In cases of snakebites, the injection which is given to the patients, contain preformed antibodies against the snake venom.

Topic: Biology, Human Health and Diseases, NEET
Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain

Options:
A Activated pathogens
B Harvested antibodies
C Gamma globulins
D Attenuated pathogens

The correct answer is:
Attenuated pathogens

Solution:
OPV sabin - Live attenuated vaccine.

Polio (also known as Poliomyelitis) is a highly contagious disease caused by a virus that results in muscular weakness. Polio vaccines are vaccines used to prevent poliomyelitis. Two types are used: an inactivated Polio virus given by injection and a weakened Polio virus given by mouth.

Topic: Biology, Human Health and Diseases, NEET, NEET 2016 (Phase 1)
Anxiety and eating spicy food together in an otherwise normal human, may lead to

Options:
A indigestion
B jaundice
C diarrhoea
D vomiting

The correct answer is:
indigestion

Solution:
Anxiety and eating spicy food together in an otherwise normal human, may lead to indigestion. In this condition, the food is not properly digested leading to a feeling of fullness. The causes of indigestion are inadequate enzyme secretion, anxiety, food poisoning, over eating and spicy food.

Topic: Biology, Human Health and Diseases, NEET, NEET 2012 (Screening)
Anxiety and eating spicy food together in an otherwise normal human may lead to

Options:
A Indigestion
B Jaundice
C Diarrhoea
D Vomiting

The correct answer is:
Indigestion

Solution:
Anxiety and eating spicy food together in a normal healthy man can lead to indigestion, which is a difficulty in digesting food properly.

Topic: Biology, Digestion and Absorption, NEET
Apart from tetrahedral geometry, another possible geometry for CH4is square planar with the four H atoms at the corners of the square and the C atom at its centre.Why CH4does not have square planar geometry?

Options:
A CH4is not square planar because carbon cannot form square planar geometry due to its atomic structure.
B CH4is not square planar because square planar geometry requires the presence of two lone pairs of electrons on the central atom, and carbon in CH4does not have any lone pairs.
C CH4is not square planar because square planar geometry would result in high repulsion between the four hydrogen atoms.
D CH4is not square planar because square planar geometry is not energetically favorable for the molecule.

The correct answer is:
CH4is not square planar because square planar geometry requires the presence of two lone pairs of electrons on the central atom, and carbon in CH4does not have any lone pairs.

Solution:
Correct Option is : (B)
CH4is not square planar because square planar geometry requires the presence of two lone pairs of electrons on the central atom, and carbon in CH4does not have any lone pairs.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Apart from water, what other proton donors can alkali metals react with?

Options:
A Gaseous ammonia and alkynes
B Acids and bases
C Alcohols and aldehydes
D Ketones and esters

The correct answer is:
Gaseous ammonia and alkynes

Solution:
Alkali metals can react not only with water but also with other proton donors such as gaseous ammonia and alkynes.

Topic: Chemistry, s Block Elements, NEET
Apical dominance can be overcome by:

Options:
A GA
B Cytokinin
C Ethylene
D Auxin

The correct answer is:
Cytokinin

Solution:
In higher plants, the growing apical bud inhibits the growth of the lateral (axillary) buds, a phenomenon called apical dominance. Removal of shoot tips (decapitation) usually results in the growth of lateral buds. Cytokinins help overcome the apical dominance. They promote nutrient mobilisation which helps in the delay of leaf senescence.

Topic: Biology, Plant - Growth and Development, NEET
Apical dominance can be removed by

Options:
A Apexotomy
B Decapitation
C Deapexation
D Capitation

The correct answer is:
Decapitation

Solution:
Apical dominance is the phenomenon where the new shoot is developed at the apex and inhibits the growth of lateral buds. Decapitation is a process where the shoot tip is cut to inhibit apical dominance and promote the lateral growth of buds.

Topic: Biology, Plant - Growth and Development, NEET
Apical dominance in higher plants is due to

Options:
A Auxin
B Gibberellins
C Ethylene
D ABA

The correct answer is:
Auxin

Solution:
Presence of auxin causes apical dominance in plants and cytokinins are responsible for breaking of apical dominance.

Topic: Biology, Plant - Growth and Development, NEET
Apical dominance is caused by

Options:
A Abscisic acid in lateral bud
B Cytokinin in leaf tip
C Gibberellin in lateral buds
D Auxin in shoot tip

The correct answer is:
Auxin in shoot tip

Solution:
The phenomenon where the later stems are suppressed in growth by the growth of the central stem is referred to as apical dominance. This occurs at the shoot tip due to the production of plant hormones. Plant hormones are chemicals that regulate the growth and development of the plant. The hormone that induces apical dominance is auxins and the hormone that break apical dominance is cytokinin.

Topic: Biology, Plant - Growth and Development, NEET
Aplysia shows all of these properties, except

Options:
A Organ system level of organization
B Segmentation
C Bilateral symmetry
D Triploblastic coelomate

The correct answer is:
Segmentation

Solution:
Aplysia belongs to Phylum Mollusca which is the second largest animal phylum. The organization seen in molluscs is of organ system level and they can be terrestrial or aquatic. Features of molluscs are that they are bilaterally symmetrical, triploblastic and coelomate animals. In molluscs the body is covered by calcareous shell and is unsegmented with distinct head, visceral hump and muscular foot. The mantle over the visceral hump is formed by soft and spongy layer of skin. There are feather like gills present in the mantle cavity (space between the hump and the mantle). Examples are Cuttle fish, Squid, Octopus, etc.

Topic: Biology, Animal Kingdom, NEET
Apogeotropic roots forming an association with BGA are observed in

Options:
A Cycas
B Pinus
C Banyan
D Peepal

The correct answer is:
Cycas

Solution:
Cycas shows presence of specialized roots called coralloid roots which are associated with the nitrogen fixing cyanobacteria. They are also called as apogeotrophic as they grow upwards.

Topic: Biology, Plant Kingdom, NEET