datavorous/entrance-exam-dataset huggingface dataset:
The capacity of an isolated sphere is increased n times when it is enclosed by an earthed concentric sphere. The ratio of their radii is

Options:
A n2n-1
B nn-1
C 2nn+1
D 2n+1n+1

The correct answer is:
nn-1

Solution:
Capacity of an isolated sphere C1=4πε0R1
and Capacity of a sphere when enclosed by an earthed concentric sphere
C2=4πε0R1R2R1+R2
Given that C2=nC1
or R2R1R2-R1=nR1
or R2R1R2R1-1=n
or R2R1=nn-1

Topic: Physics, Electrostatics, NEET
The capacity of an isolated sphere is increased n times when it is enclosed by an earthed concentric sphere. The ratio of their radii is

Options:
A n 2 n - 1
B n n - 1
C 2 n n + 1
D 2 n + 1 n + 1

The correct answer is:
n n - 1

Solution:
C 1 = 4 Ï Îµ 0 R 1
and C 2 = 4 Ï Îµ 0 R 1 R 2 R 2 - R 1
Given that C 2 = nC 1
â´ R 1 R 2 R 2 - R 1 = nR 1
or R 2 / R 1 R 2 / R 1 - 1 = n
or R 2 R 1 = n n - 1

Topic: Physics, Electrostatics, NEET
The capacity to generate a whole plant from any cell of the plant is called:

Options:
A Micropropagation
B Differentiation
C Somatic hybridization
D Totipotency

The correct answer is:
Totipotency

Solution:
Totipotency is defined as the capacity to generate a whole plant from any cell of the plant.

Topic: Biology, Biodiversity and its Conservation, NEET, NEET 2024
The carbon dioxide acceptor in the Calvin cycle is

Options:
A phosphoenol pyruvate.
B ribulose 1,5-diphosphate.
C phosphoglyceric acid.
D ribulose monophosphate.

The correct answer is:
ribulose 1,5-diphosphate.

Solution:
In the Calvin cycle, initial CO2 is accepted by Ribulose 1,5 diphosphate (RuBP) already present in the cells and a 6carbon addition compound is formed which is unstable. It soon gets converted into 2 molecules of 3 phosphoglyceric acid due to hydrolysis.

Topic: Biology, Photosynthesis in Higher Plants, NEET
The carbon-carbon bond distance in benzene is

Options:
A Longer than a C-C single bond
B Longer than a C=C double bond
C Shorter than a C=C double bond
D Shorter than a C≡C triple bond

The correct answer is:
Longer than a C=C double bond

Solution:
The bond length of carbon-carbon single bond is 1.54 A o and the carbon double bond carbon bond length is 1.32 A o . In benzene due to resonance all bond lengths are equal which is 1.4 A o .
Hence, C - C bond length in benzene is longer length C = C.

Topic: Chemistry, General Organic Chemistry, NEET
The carbon-chlorine bond length is shortest in

Options:
A CH2=CH–Cl
B CH3–Cl
C C6H5–CH2–Cl
D CH2=CH–CH2–Cl

The correct answer is:
CH2=CH–Cl

Solution:
The carbon-chlorine bond length is shortest in CH2=CH–Cl as lone pair of Cl is involved in delocallisation due to which a double bond character develops between C and Cl-atoms.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
The carbon-oxygen bond in phenol is slightly stronger than that in methanol. Why?

Options:
A Phenol has a more polarizable electron cloud, leading to stronger bonding.
B Phenol has a higher electronegativity difference between carbon and oxygen.
C Methanol has a greater steric hindrance around the carbon-oxygen bond.
D This is due to the fact that in phenol, conjugation of an unshared electron pair over oxygen with an aromatic ring results in partial double bond character in carbon-oxygen bond.

The correct answer is:
This is due to the fact that in phenol, conjugation of an unshared electron pair over oxygen with an aromatic ring results in partial double bond character in carbon-oxygen bond.

Solution:
Correct Option is : (D)
This is due to the fact that in phenol, conjugation of an unshared electron pair over oxygen with an aromatic ring results in partial double bond character in carbon-oxygen bond.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
The cardiac activity could be moderated by the autonomous neural system. Tick the correct answer.

Options:
A The parasympathetic system stimulates the heart rate and stroke volume
B The sympathetic system stimulates the heart rate and stroke volume
C The parasympathetic system decreases the heart rate but increases stroke volume
D The sympathetic system decreases the heart rate but increases stroke volume

The correct answer is:
The sympathetic system stimulates the heart rate and stroke volume

Solution:
The sympathetic system stimulates the heart rate and stroke volume. Due to this cardiac activity is moderated.

Topic: Biology, Body Fluids and Circulation, NEET
The cardiac impulse is initiated and conducted further up to the ventricle. The correct sequence of conduction of impulse is

Options:
A SA Node→ AV Node→ Purkinje fibre→ AV Bundle
B SA Node→ Purkinje fibre→ AV Node→ AV Bundle
C SA Node→ AV Node→ AV Bundle→ Purkinje fibre
D SA Node→ Purkinje fibre→ AV Bundle→ AV Node

The correct answer is:
SA Node→ AV Node→ AV Bundle→ Purkinje fibre

Solution:
The correct sequence of conduction of impulse is SA Node→ AV Node→ AV Bundle→ Purkinje fibre.

Topic: Biology, Body Fluids and Circulation, NEET
The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker has to be grafted in him. It is likely that it will be grafted at the site of

Options:
A

Atrioventricular bundle

B

Purkinje system

C

Sinuatrial node

D

Atrioventricular node

The correct answer is:

Sinuatrial node

Solution:
SA node is the natural pacemaker located in the right upper corner of the right atrium. SA node initiates the cardiac impulse. So, artificial pacemaker will be grafted at the site of SA node.

Topic: Biology, Body Fluids and Circulation, NEET
The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of:

Options:
A atroventricular bundle
B purkinje system
C sinoatrial node
D atrioventricular node.

The correct answer is:
sinoatrial node

Solution:
SA node is a specialised bundle of neurons located in the upper part

Topic: Biology, Body Fluids and Circulation, NEET, NEET 2004
The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of

Options:
A Atrioventricular bundle
B Purkinje system
C Sino-atrial node
D Atrio-ventricular node

The correct answer is:
Sino-atrial node

Solution:
SA node is the natural pacemaker located in the right atrium. SA node initiates the cardiac impulse. Hence, an artificial pacemaker will be grafted at the site of the SA node.

Topic: Biology, Body Fluids and Circulation, NEET
The Carnot cycle of a reversible heat engine consists of

Options:
A One isothermal and two adiabatic processes
B Two isothermal and one adiabatic processes
C Two isothermal and two adiabatic processes
D Two isobaric and two isothermal processes

The correct answer is:
Two isothermal and two adiabatic processes

Solution:
The Carnot cycle of a reversible heat engine consists of two isothermal and two adiabatic processes.

Topic: Physics, Thermodynamics, NEET
The carrier for amoebiasis is

Options:
A Entamoebia histolytica
B Mosquito
C Musca
D Plasmodium vivax

The correct answer is:
Musca

Solution:
Amoebiasis is commonly known as Amoebic dysentery. This is caused by Entamoebia histolytica. The symptoms include diarrhea and dysentery. Vectors such as flies, cockroaches and rodents act as carrier. Houseflies are known as Musca domestica. This is binomial nomenclature.

Topic: Biology, Human Health and Diseases, NEET
The carriers of the current in the cell: What serves as the carriers of the current in this cell?

Options:
A Electrons (e-)
B Zinc ions (Zn2+)
C Silver ions (Ag+)
D Protons (H+)

The correct answer is:
Electrons (e-)

Solution:
Correct Option is : (A)
Electrons (e-)

Topic: Chemistry, Redox Reactions, NEET
The carriers of the current in the cell.

Options:
A Electrons in the wire
B Zinc ions
C Silver ions
D Protons in the solution

The correct answer is:
Electrons in the wire

Solution:
Correct Option is : (A)
Electrons in the wire

Topic: Chemistry, Electrochemistry, NEET
The cartilaginous structure/s, lined with mucous membrane is/are

Options:
A Larynx
B Pharynx
C Trachea
D Both (a) and (c)

The correct answer is:
Both (a) and (c)

Solution:
The larynx is a cartilaginous box which helps in sound production, and hence, it is called the soundbox. During swallowing, glottis can be covered by a thin elastic cartilaginous flap called epiglottis to prevent the entry of food into the larynx. This muscular and cartilaginous structure is lined with a mucous membrane. This structure is situated at the top of the trachea and below the root of the tongue and the hyoid bone.
The trachea or windpipe is lined with ciliated pseudostratified columnar epithelium with mucous secretion. In the trachea, there are cartilaginous tracheal rings for flexibility. The pharynx is a muscular tissue without cartilages.

Topic: Biology, Breathing and Exchange of Gases, NEET
The catalyst for Ostwald’s process for manufacture of HNO3 is

Options:
A Platinised asbestos
B Finely divided iron
C Vanadium Pentoxide
D Mo

The correct answer is:
Platinised asbestos

Solution:
Correct Option is : 1
Platinised asbestos

Topic: Chemistry, Surface Chemistry, NEET
The catalyst used in the manufacture of polyethylene by Ziegler-Natta's method is:

Options:
A Titanium tetrachloride and triphenyl aluminium
B Titanium tetrachloride and triethyl aluminium
C Titanium dioxide
D Titanium isoperoxide

The correct answer is:
Titanium tetrachloride and triethyl aluminium

Solution:
Ziegler - Natta's catalyst which is used in polymerisation of ethene is (C2H5)3 Al + TiCl4.

Topic: Chemistry, Polymers, NEET
The catalyst used in the manufacture of polyethylene Ziegler method is

Options:
A titanium tetrachloride and triphenyl aluminium
B titanium tetrachloride and triethyl aluminium
C titanium dioxide
D titanium isopropoxide

The correct answer is:
titanium tetrachloride and triethyl aluminium

Solution:
The catalyst used in the manufacture of polyethylene Ziegler method is
TiCl4+(C2H5)3Al (Ziegler-Natta catalyst.)

Topic: Chemistry, Surface Chemistry, NEET
The catalytic efficiency of two different enzymes can be compared by the:

Options:
A formation of the product
B the $\mathrm{pH}$ of optimum value
C the $\mathrm{K}_{\mathrm{m}}$ value
D molecular size of the enzyme.

The correct answer is:
the $\mathrm{K}_{\mathrm{m}}$ value

Solution:
The catalytic efficiency of two different enzymes can be compared by comparing their $\mathrm{K}_{\mathrm{m}}$ value or Michaelis Menten constant. The Michaelis constant is the substrate concentration at which the reaction rate is at half-maximum. The $\mathrm{K}_{\mathrm{m}}$ describes the affinity of enzyme for a substrate molecule. Greater the affinity lower is the $\mathrm{K}_{\mathrm{m}}$ value and sooner the $\mathrm{V}_{\max }$ can be attained and vice versa.
Related Theory
$K_m$ is the concentration of substrate which permits the enzyme to achieve half Vmax. An enzyme with a high $K_m$ has a low affinity for its substrate, and requires a greater concentration of substrate to achieve Vmax. The relationship is defined by the MichaelisMenten equation:
$$
v=V_{\max } /\left(I+\left(K_m /[S]\right)\right)
$$
The Lineweaver-Burk double reciprocal plot rearranges the Michaelis-Menten equation as:
$$
1 / v=1 / V_{\max }+K_m / V_{\max } \times 1 /[S]
$$
Plotting 1/v against 1/[S] give a straight line:
where: $y$ intercept $=1 / V_{\max }$
gradient $=K_m / V_{\max }$
$x$ intercept $=-1 / K_m$

Topic: Biology, Biomolecules (B), NEET, NEET 2005
The catalytic efficiency of two different enzymes can be compared by

Options:
A its Km value.
B its pH optimum value.
C the molecular size of the enzyme.
D the formation of the product.

The correct answer is:
its Km value.

Solution:
Km is the substrate concentration required to reach half the maximum velocity of the reaction. Lower value of Km indicates higher affinity between substrate and the enzyme, thus reaction is fast. The lower value of Km indicates lower affinity and the reaction is slow.

Topic: Chemistry, Biomolecules, NEET
The causal organism for African sleeping sickness is

Options:
A

T. gambiense

B

T. tangela

C

T. rhodesiense

D

Trypanosoma cruzi

The correct answer is:

T. gambiense

Solution:
African sleeping sickness disease also called trypanosomiasis common in Africa is caused by parasite Trypanosoma gambiense. The parasite is transmitted by Tes-Tse fly (Glossina palpalis).

Topic: Biology, Biological Classification, NEET
The causative agent for mad cow disease is:

Options:
A Viroid
B Mycoplasma
C Prions
D Virus

The correct answer is:
Prions

Solution:
Prions: In modern medicine certain infectious neurological diseases were found to be transmitted by an agent consisting of abnormally folded protein. The agent was similar in size to viruses. These agents were called prions. The most notable diseases caused by prions are bovine spongiform encephalopathy (BSE) commonly called mad cow disease in cattle and its analogous variant Cr–Jacob disease (CJD) in humans.

Topic: Biology, Biological Classification, NEET
The causative agent of dysentery is/are:

Options:
A Virus
B Fungi
C Protozoa
D Both (A) and (C)

The correct answer is:
Protozoa

Solution:
Entamoeba histolytica is a protozoan parasite in the large intestine of human which causes amoebiasis (amoebic dysentery). Symptoms of this disease include constipation, abdominal pain and cramps, stools with excess mucous and blood clots. Houseflies act as mechanical carriers and serve to transmit the parasite from faeces of an infected person to food and food products, thereby contaminating them. Drinking water and food contaminated by the faecal matter are the primary sources of infection.

Topic: Biology, Human Health and Diseases, NEET
The causative agent of mad-cow disease:

Options:
A virus
B bacterium
C prion
D worm

The correct answer is:
prion

Solution:
$\mathrm{M}$ a d c o w d ise a se, or bovine spongiform encephalopathy (BSE), is a disease that was first found in cattle is caused by a prion.
Related Theory
Prions are the infectious agents responsible for several neurodegenerative diseases in mammals. This happens due to the abnormal folding of the proteins in the brain. It refers to the hypothesis that the infectious agents causing the diseases contain only proteins. It explained why the infectious agents are resistant to ultraviolet radiations. They can break down the nucleic acids, but are receptive to substances that denature proteins.

Topic: Biology, Biological Classification, NEET, NEET 2006
The causative organism for brown rust of wheat is?

Options:
A Aspergillus
B Collectotrichum
C Xanthomonas
D Puccinia

The correct answer is:
Puccinia

Solution:
The brown rust in wheat is one of the devastating seasonal diseases in India. Leaf, stripe, and stem rust are caused by Puccinia fungi. The pathogenic fungi are also called rust fungi because in the infected area an orange-colored powdery mass is observed.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
The cavity present in the Graafian follicle is called

Options:
A Amniotic cavity
B Archenteron
C Antrum
D Ostium

The correct answer is:
Antrum

Solution:
The cavity of Graafian follicle is an antrum or follicular cavity having liquor folliculi and an eccentrically placed oocyte.

Topic: Biology, Human Reproduction, NEET
The cell division of cytoplasm that occurs during the M phase of the cell cycle is called ___.

Options:
A Cytokinesis
B Karyokinesis
C Photolysis
D None of the above

The correct answer is:
Cytokinesis

Solution:
The cell division of cytoplasm that occurs during the M phase of the cell cycle is called Cytokinesis

Topic: Biology, Cell Cycle and Cell Division, NEET
The cell junction responsible for the beating of cardiac muscle as an unit is:

Options:
A Intercalated disc
B Interdigitations
C Desmosomes
D Skeletal muscles

The correct answer is:
Intercalated disc

Solution:
Gap junction forms channels between adjacent cardiac muscle fibres. Intercalated discs are part of the sarcolemma and contain two structures important in cardiac muscle contraction: gap junctions and desmosomes.

Topic: Biology, Structural Organisation in Animals, NEET
The cell junctions called as tight, adhering and gap junctions are found in

Options:
A Muscular tissue
B Connective tissue
C Epithelial tissue
D Neural tissue

The correct answer is:
Epithelial tissue

Solution:
In epithelial tissue, at place the adjacent cells form ion-rich gap or cell junctions for intercellular communication and chemical exchange. These junctions probably do not provide physical support.

Topic: Biology, Structural Organisation in Animals, NEET
The cell junctions called tight, adhering and gap junctions are found in

Options:
A muscular tissue
B connective tissue
C epithelial tissue
D neural tissue

The correct answer is:
epithelial tissue

Solution:
In epithelial tissue, at place the adjacent cells form ion-rich gap or cell junctions for intercellular communication and chemical exchange. These junctions probably do not provide physical support.

Topic: Biology, Structural Organisation in Animals, NEET, NEET 2009 (Screening)
The cell junctions called tight, adhering and gap junctions are found in

Options:
A Muscular tissue
B Connective tissue
C Epithelial tissue
D Neural tissue

The correct answer is:
Epithelial tissue

Solution:
All cells in the epithelium are held together with little intercellular material. In nearly all animal tissues, specialised junctions provide both structural and functional links between their individual cells. Three types of cell junctions are found in the epithelium and other tissues. These are called tight, adhering and gap junctions. Tight junctions help to stop substances from leaking across a tissue. Adhering junctions perform cementing to keep neighbouring cells together. Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules.

Topic: Biology, Structural Organisation in Animals, NEET
The cell organelle associated with photorespiration is

Options:
A Mesosome
B Ribosome
C Peroxisome
D Lysosome

The correct answer is:
Peroxisome

Solution:
Photorespiration is a wasteful process which occurs in C-3 plants at high temperature and high light intensity. It occurs by glycolate cycle which occurs in chloroplasts, mitochondria and peroxisomes.

Topic: Biology, Photosynthesis in Higher Plants, NEET
The cell organelle showing extensive polymorphism is

Options:
A Ribosomes
B Chloroplast
C Lysosomes
D Golgi bodies

The correct answer is:
Lysosomes

Solution:
Lysosomes are membrane-bound organelles. These are formed by the Golgi apparatus and contain many hydrolytic enzymes. These enzymes become active in acidic pH and bring about the process of phagocytosis and hence are regarded as suicidal bags. Thus, by forming pseudopodia they also show extensive polymorphism.

Topic: Biology, Cell - The Unit of Life, NEET
The cell organelle that is in close proximity to the cis face of Golgi bodies is

Options:
A lysosomes.
B mitochondria.
C peroxisomes.
D endoplasmic reticulum.

The correct answer is:
endoplasmic reticulum.

Solution:
A dense network of tubular structures distributed in the cytoplasm of eukaryotic cell is called as endoplasmic reticulum. It is part of the endomembrane system of the cell. The organelles involved in the synthesis of protein, lipids and steroids.
The Golgi apparatus principally performs the function of packaging materials, to be delivered either to the intracellular targets or secreted outside the cell. Materials to be packaged in the form of vesicles from the ER fuse with the cis face of the Golgi apparatus and move towards the maturing face.

Topic: Biology, Cell - The Unit of Life, NEET
The cell that divides to form two male nuclei in angiosperms is

Options:
A	Vegetative cell
B Generative cell
C Tube cell
D Antheridial cell

The correct answer is:
Generative cell

Solution:
Generative cell divides into two male gametes, If it has not divided already.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
The cell wall consists of

Options:
A Lignin, hemicellulose, protein and lipid
B Hemicellulose, cellulose, tubulin and lignin
C Lignin, hemicellulose, pectin and lipid cellulose
D Lignin, hemicellulose, pectin and cellulose

The correct answer is:
Lignin, hemicellulose, pectin and cellulose

Solution:
Cell wall consists of lignin, hemicellulose, pectin and cellulose.

Topic: Biology, Cell - The Unit of Life, NEET
The cell wall of the diatom is made up of:

Options:
A CaCO3
B Silica
C Magnesium carbonate
D Calcium phosphate

The correct answer is:
Silica

Solution:
Cell wall of diatom is deposited with silica. After the death of diatoms, cell wall is resistant to decomposition, piles up at the floor of water body and forms diatomaceous earth.

Topic: Biology, Biological Classification, NEET
The cell wall thickening material in collenchyma is

Options:
A Pectin, cellulose, hemicellulose
B Lignin, cellulose, hemicelluloses
C Hemicellulose, suberin, cellulose
D Suberin, pectin, cellulose

The correct answer is:
Pectin, cellulose, hemicellulose

Solution:
Collenchyma cells have thickenings on the cell wall and in corners of intercellular spaces. They are not found in roots and monocots. These cells form hypodermis in stem and petiole. It is living mechanical tissue with a high refractive index. The thickening material in the cell wall contains pectin, cellulose, hemicelluloses.

Topic: Biology, Anatomy of Flowering Plants, NEET
The cell-derived from meristems differentiates and regain the capacity to divide by a phenomenon called

Options:
A Differentiation
B Dedifferentiation
C Redifferentiation
D Totipotency

The correct answer is:
Dedifferentiation

Solution:
The cells derived from root apical and shoot-apical meristems and cambium differentiate and mature to perform specific functions. This act leading to maturation is termed as differentiation.
The living differentiated cells, that by now have lost the capacity to divide can regain the capacity of division under certain conditions. This phenomenon is termed as dedifferentiation.
While doing so, such meristems/tissues are able to divide and produce cells that once again lose the capacity to divide but mature to perform specific functions, i.e., get redifferentiated.

Topic: Biology, Plant - Growth and Development, NEET
The cell-mediated immunity inside the human body is carried out by

Options:
A T-lymphocytes
B B-lymphocytes
C thrombocytes
D erythrocytes

The correct answer is:
T-lymphocytes

Solution:
T-lymphocyte receptors can recognise only antigen that bound to cell membrane proteins. These lymphocytes mediate CMI (cell mediated immunity). B-lymphocytes are the major effector molecules of humoral immunity. Erythrocytes are red blood cells. Thrombocytes or platelets secrete factors that are involved in vascular repair.

Topic: Biology, Human Health and Diseases, NEET, NEET 2013 (All India)
The cells in the embryo sac located at the micropylar end are:

Options:
A Synergids only
B Antipodals
C Egg apparatus
D Funicle

The correct answer is:
Egg apparatus

Solution:
There is a characteristic distribution of the cells within the embryosac. Three cells are grouped together at the micropylar end and constitutethe egg apparatus. The egg apparatus, in turn, consists of two synergidsand one egg cell.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
The cells involved in inflammatory reactions are

Options:
A Basophils
B Neutrophils
C Eosinophils
D Lymphocytes

The correct answer is:
Lymphocytes

Solution:
Lymphocytes are involved in inflammatory reactions.

Topic: Biology, Body Fluids and Circulation, NEET
The cells of the embryo sac in the chalazal end are called as

Options:
A Antipodal cells
B Synergids
C Egg and synergids
D Antipodals and synergids

The correct answer is:
Antipodal cells

Solution:
The embryo sac in plants is 7–celled and 8–nucleated structure called polygonum type. Three cells are at the chalazal end and are called the antipodals. The three cells degenerate soon after the process of double fertilization.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET