datavorous/entrance-exam-dataset huggingface dataset:
Cuboidal epithelium with brush border of microvilli is found in

Options:
A Ducts of salivary glands
B Proximal convoluted tubule of nephron
C Eustachian tube
D Lining of intestine

The correct answer is:
Proximal convoluted tubule of nephron

Solution:
SIMPLE CILIATED EPITHELIUM:

Structure: The simple ciliated epithelium comprises cells bearing fine, vibratile cilia on their free surface. Mixed with the ciliated cells, mucus-secreting goblet cells are found at intervals. It is of two types:

* Cuboidal ciliated epithelium: It comprises cuboidal cells bearing cilia on their free surface. It is found in the nephrons and facilitates urine formation.

* Columnar ciliated epithelium: It comprises columnar cells that bear cilia on the free surface. It forms the lining of the ventricles of the brain, oviducts, central canal of the spinal cord, nasal passages, and terminal bronchioles. It is also present in the lining of the alimentary canal.

Topic: Biology, Structural Organisation in Animals, NEET, NEET 2020 (Phase 1)
CuCO3.Cu(OH)2is also known as:

Options:
A Copper pyrites
B Malachite
C Cuprite
D Siderite

The correct answer is:
Malachite

Solution:
Correct Option is : 2
Malachite

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
CuFeS2is primarily an ore of:

Options:
A Iron
B Copper
C Sulphur
D None of the above

The correct answer is:
Copper

Solution:
Correct Option is : 2
Copper

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Curie temperatures is the temperature above which

Options:
A ferromagnetic material becomes paramagnetic material
B paramagnetic material becomes diamagnetic material
C paramagnetic materíal becomes ferromagnetic material
D ferromagnetic material becomes diamagnetic material

The correct answer is:
ferromagnetic material becomes paramagnetic material

Solution:
Ferromagnetism decreases with rise in temperature. If we heat a ferromagnetic substance, then at a definite temperature the ferromagnetic property of the substance suddenly disappears and the substance becomes paramagnetic. The temperature above which a ferromagnetic substance becomes paramagnetic is called the Curie temperature of the substance.
Note: The Curie temperature of iron is $770^{\circ} \mathrm{C}$ and that of nickle in $358^{\circ} \mathrm{C}$.

Topic: Physics, Magnetic Properties of Matter, NEET, NEET 2008 (Screening)
Curing of tea leaves is brought about by the activity of:

Options:
A fungi
B bacteria
C mycorrhiza
D viruses

The correct answer is:
bacteria

Solution:
The curing of tea leaves is done by gram positive aerobic bacterium Mycrococcus candidans, Bacillus megaterium.
Related Theory
Curing is a process done to add special flavour and taste in tea leaves and remove its bitterness. It is also done for tobacco. In this process after harvesting the cured leaves are hung in shade and are permitted for the action of bacteria. It is essentially an oxidation dry fermentation process, during which, water is driven off, the green colour is lost and the leaves assume a tougher texture and undergo chemical changes.

Topic: Biology, Biological Classification, NEET, NEET 2006
Current I is flowing in a conductor as shown in the figure. The radius of the curved part is R. The length of straight portions is very long. The value of the magnetic field at the centre O will be

Options:
A μ0I4πR3π2+1
B μ0I4πR3π2-1
C μ0I4πRπ2+1
D μ0I4πRπ2-1

The correct answer is:
μ0I4πR3π2+1

Solution:
From the figure, the circular part subtended angle at the centre of the circle =3Ï/2
â´Â Magnetic field at O due to the circular part,
B1=Î¼02⋅IR⋅Î¸2Ï
=Î¼02⋅IR⋅3Ï/22Ï=Î¼08⋅3IR ...(i)
âµÂ Point O at the axial position of wire CD
â´Â It will not produce magnetic field at O.
âµ Point O is at the end of the wire AE.
â´Â Magnetic field due to wire AE,
B2=Î¼04Ï⋅IR ...(ii)
Thus, Bnet=B1+B2
Putting the value of B1 and B1 from equations (i) and (ii), we get
=3Î¼0I8R+Î¼0I4ÏR=Î¼04Ï⋅IR3Ï2+1

Topic: Physics, Magnetic Effects of Current, NEET
Current in the given circuit will be

Options:
A 540 A
B 550 A
C 510 A
D 520 A

The correct answer is:
550 A

Solution:
The diode in the lower branch is forward and diode in the upper branch is reversed biased, so
i=520+30=550 A

Topic: Physics, Semiconductors, NEET
Current passing through 1 Î© resistance is zero. Then the emf E is

Options:
A 8 V
B 6 V
C 4 V
D 12 V

The correct answer is:
6 V

Solution:
Potential difference across 2 Ω resistance from left side is 6 V. Therefore, potential difference across 2 Ω resistance from right side should also be 6 V. This is possible only if E=6 V as the current passing through 1 Ω resistance is zero.

Topic: Physics, Current Electricity, NEET
Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is

Options:
A 250  Ω
B 25  Ω
C 40  Ω
D 500  Ω

The correct answer is:
250  Ω

Solution:
Î¸i=5010-3=5000,Î¸V=20
â Î¸/iÎ¸/V=500010=250âVi=R=250 Î©
(âµâVoltage sensitivity = current sensitivity Resistance)

Topic: Physics, Current Electricity, NEET, NEET 2018
Current through the ideal diode is

Options:
A zero
B 20 A
C 120 A
D 150 A

The correct answer is:
zero

Solution:
PN Junction is in reverse bias therefore current is zero.

Topic: Physics, Semiconductors, NEET
Currently, more than 15,500 species worldwide are facing the threat of extinction. Out of these, what is the percentage of threatened mammalian species

Options:
A 12%
B 32%
C 31%
D 23%

The correct answer is:
23%

Solution:
Adding to the grim scenario of extinctions is the fact that more than 15,500 species world-wide are facing the threat of extinction. Presently, 12 per cent of all bird species, 23 per cent of all mammal species, 32 per cent of all amphibian species and 31per cent of all gymnosperm species in the world face the threat of extinction.

Topic: Biology, Biodiversity and its Conservation, NEET
Currently we are experiencing the ________ episode of mass extinction of species

Options:
A Fifth
B Sixth
C Seventh
D Tenth

The correct answer is:
Sixth

Solution:
There have been five episodes of mass extinctions of species since the origin and diversification of life on Earth. Currently, we are experiencing the sixth episode of mass extinction of species in which species extinction rates are estimated to be 100 to 1,000 times faster than in the pre-human times.

Topic: Biology, Biodiversity and its Conservation, NEET
Currents flowing in each of the following circuits A and B respectively are

Options:
A 1âA,ââ2 A
B 2âA,ââ1 A
C 4âA,ââ2âA
D 2âA,ââ4âA

The correct answer is:
4 A,  2 A

Solution:
In circuit A, both (p-n) junction diode act as forward biasing.
Hence, current flow in circuit A.

Total resistance R is given by

1R=14+14

Or 1R=24

Or R=2  Ω

According to Ohm's law

IA=82=4 A
In circuit B , lower p-n-junction diode is reverse biased. Hence, no current will flow but upper diode is forward biased so current, can flow through it
IB=84=2 A

Topic: Physics, Semiconductors, NEET
CuSO4.5H2O is blue in color while CuSO4is colorless. Why?

Options:
A Presence of water molecules in CuSO4.5H2O induces ligand field splitting.
B CuSO4undergoes decomposition in the absence of water, leading to loss of color.
C The crystal field stabilization energy of CuSO4.5H2O results in a color change.
D CuSO4has a lower coordination number, preventing the manifestation of color.

The correct answer is:
Presence of water molecules in CuSO4.5H2O induces ligand field splitting.

Solution:
Correct Option is : (A)
Presence of water molecules in CuSO4.5H2O induces ligand field splitting.

Topic: Chemistry, Coordination Compounds, NEET
Cut-pieces of a Bryophyllum leaf, when put into wet soil, produce new plants. This phenomenon is called as

Options:
A

Vegetative propagation

B

Tissue culture

C

Leaf primordial culture

D

Meristem culture

The correct answer is:

Vegetative propagation

Solution:
Vegetative propagation is a form of asexual reproduction of a plant. Only one plant is involved and the offspring is the result of one parent. The new plant is genetically identical to the parent. The plants arise from the nodes present in the modified stems of the plants. When the nodes come in contact with the damp soil or water, they produce roots. Similarly, adventitious buds arise from the notches present at the margins of leaves of Bryophyllum. This ability is fully exploited for commercial propagation of such plants.

Topic: Biology, Reproduction in Organisms, NEET
Cyanide ion acts as an ambident nucleophile. From which end it acts as a stronger nucleophile in aqueous medium? Give reason for your answer.

Options:
A Cyanide ion (CN-) acts as a stronger nucleophile from the carbon end (C-end) in aqueous medium.
B Cyanide ion (CN-) acts as a stronger nucleophile from the nitrogen end (N-end) in aqueous medium.
C Cyanide ion (CN-) acts as an equally strong nucleophile from both ends in aqueous medium.
D Cyanide ion (CN-) does not act as a nucleophile in aqueous medium.

The correct answer is:
Cyanide ion (CN-) acts as a stronger nucleophile from the carbon end (C-end) in aqueous medium.

Solution:
Correct Option is : (A)
Cyanide ion (CN-) acts as a stronger nucleophile from the carbon end (C-end) in aqueous medium.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Cyanobacteria are classified under kingdom

Options:
A Monera.
B Protista.
C Algae.
D Plantae.

The correct answer is:
Monera.

Solution:
In the five-kingdom classification system, the kingdom Monera includes all the prokaryotic celled organisms. Prokaryotes are organisms whose cells lack a well-defined nucleus. All the bacterial groups are included in Monera as well since bacteria have a prokaryotic cell structure. Cyanobacteria are a group of free-living photosynthetic bacteria that perform oxygenic photosynthetic process. Due to their bluish-green color and photosynthetic process, cyanobacteria were called as blue-green algae (BGA) but later changed to the current name as they appear bluish. Algae are a group of organisms that come in eukaryotic groups.

Topic: Biology, Biological Classification, NEET
Cyanobacteria is found in association with:

Options:
A Coralloid roots of Pinus
B Mycorrhizal roots of Pinus
C Coralloid roots of Cycas
D Mycorrhizal roots of Cycas

The correct answer is:
Coralloid roots of Cycas

Solution:
The coralloid root is developed in Cycas. It is produced in clusters at the base of the stem and protrudes out over the ground. It is dichotomously branched and greenish-brown in colour. It contains an algal zone in the cortex. This algal zone contains blue-green like Nostoc and Anabaena, which grow in symbiotic association with coralloid roots.

Topic: Biology, Plant Kingdom, NEET
Cyanobacteria or blue-green algae contain some specialized cells, known as ________.

Options:
A Akinetes
B Heterocyst
C Aplanospore
D Zoospores

The correct answer is:
Heterocyst

Solution:
Heterocysts are specialised cells for N2 fixation while akinetes, aplanospores and zoospores are asexual spores. In blue green algae, no sexual reproduction is observed.

Topic: Biology, Biological Classification, NEET
Cyanohydrin of which compound on hydrolysis will give lactic acid?

Options:
A C6H5CHO
B HCHO
C CH3CHO
D CH3-CH2-CHO

The correct answer is:
CH3CHO

Solution:
Cynohydrin of acetaldehyde on hydrolysis gives Lactic acid as follows

Topic: Chemistry, Aldehydes and Ketones, NEET
Cyanohydrin of which of the following compound can form lactic acid?

Options:
A CH3CH2CHO
B CH3CHO
C HCHO
D CH3COCH3

The correct answer is:
CH3CHO

Solution:
We know that carbonyl compound react with cyanide ion to form cyanohydrin. This on further hydrolysis gives carboxylic acid.

Topic: Chemistry, Aldehydes and Ketones, NEET
Cyanophycean granules and glycogen granules are examples of

Options:
A Microbodies
B Inclusion bodies
C SER
D Lysosomes

The correct answer is:
Inclusion bodies

Solution:
Reserve material in prokaryotic cells is stored in the cytoplasm in the form of inclusion bodies. These are not bound by any membrane system and lie free in the cytoplasm, e.g., phosphate granules, cyanophycean granules, and glycogen granules. Gas vacuoles are found in blue-green and purple and green photosynthetic bacteria.

Topic: Biology, Cell - The Unit of Life, NEET
Cycas and Adiantum resemble each other in having

Options:
A seeds
B motile sperms
C cambium
D vessels

The correct answer is:
motile sperms

Solution:
Multiciliated motile sperms are found in both Cycas (gymnosperm) and Adiantum or walking fern (pteridophyte).
Seeds and cambium are present in Cycas (quite common in gymnosperms) but absent in pteridophytes. Vessels are absent in both.

Topic: Biology, Plant Kingdom, NEET, NEET 2012 (Screening)
Cycas have two cotyledons but not included in angiosperms because of

Options:
A Naked ovules
B Seems like monocot
C Circinate venation
D Compound leaves

The correct answer is:
Naked ovules

Solution:
In Cycas (gymnosperm) the seed does not occur inside a fruit but lies naked or exposed on the surface of megasporophyll.

Topic: Biology, Plant Kingdom, NEET
Cyclic menstruation is an indicator of the ____________ and extends between ________ and ____________.

Options:
A a-normal reproductive phase; b-menopause; c-menarche
B a-normal reproductive phase; b-menarche; c-menopause
C a-degenerative reproductive phase; b-menarche; c-menopause
D a-abnormal reproductive phase; b-menopause; c-menarche

The correct answer is:
a-normal reproductive phase; b-menarche; c-menopause

Solution:
Cyclic menstruation is an indicator of the normal reproductive phase and extends between menarche and menopause. In human beings, menarche starts at puberty and menstrual cycle ceases around 50 years of age; that is termed as menopause.

Topic: Biology, Human Reproduction, NEET
Cyclic photophosphorylation results in the formation of:

Options:
A ATP and NADPH
B ATP, NADPH and O2
C ATP
D NADPH

The correct answer is:
ATP

Solution:
Photosynthesis is the method in which, the phosphorylation of ADP to generate ATP occur with the help of the energy in form of sunlight is known photophosphorylation.

Topic: Biology, Photosynthesis in Higher Plants, NEET
Cyclic-photophosphorylation results in the formation of

Options:
A $\mathrm{NADPH}$
B ATP and NADPH
C ATP, NADPH and $\mathrm{O}_2$
D $\mathrm{ATP}$

The correct answer is:
$\mathrm{ATP}$

Solution:
Cyclic-photophosphorylation involves only pigment system-I. When the photons activate PS-I, a pair of electrons are raised to a higher energy level. They are captured by primary acceptor, which passes them on to ferredoxin, plastoquinone, cytochrome complex, plastocyanin and finallyback to reaction centre of PS-I, ie, $\mathbf{P}_{700}$. At each step of electron transfer, the electrons lose potential energy. Their trip down hill is caused by the transport chain to pump $\mathrm{H}^{+}$across the thylakoid membrane. The proton gradient thus established is responsible for forming ATP (2 molecules). No reduction of NADP to NADPH $+\mathbf{H}^{+}$.

Topic: Biology, Respiration in Plants, NEET, NEET 2009 (Screening)
Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E and compound E on further treatment with aqueous KOH yields compound F. Then compound F is

Options:
A
B
C
D

The correct answer is:

Solution:

Topic: Chemistry, Aldehydes and Ketones, NEET
Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E. Compound E on further treatment with aqueous KOH yields compound F. Compound F is

Options:
A
B
C
D

The correct answer is:

Solution:
Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E which is hexa-1,6-di-al. It on further reaction with KOH undergoes Aldol condensation to give cyclopentene-1 carbaldehyde (F).

Topic: Chemistry, Aldehydes and Ketones, NEET
Cyclosporin A is commercially produced by the action of

Options:
A Trichoderma - Fungus
B Trichoderma - Bacteria
C Monascus - Fungus
D Monascus - Bacteria.

The correct answer is:
Trichoderma - Fungus

Solution:
Trichoderma is a genus of fungi in the family Hypocreaceae, that is present in all soils, where they are the most prevalent culturable fungi. Many species in this genus can be characterized as opportunistic avirulent plant symbionts. Trichoderma spp. are the most widely used fungal biocontrol agents against fungal diseases of pulses, grapes, cotton, onion, carrot, peas, plums, maize, apple, etc.

Topic: Biology, Microbes in Human Welfare, NEET
Cyclosporin A, used as an immuno-suppression agent, is produced from:

Options:
A Monascus purpureus
B Saccharomyces cerevisiae
C Penicillium notatum
D Trichoderma polysporum

The correct answer is:
Trichoderma polysporum

Solution:
Monascus purpureus, yeast is used for the industrial production of statins, that are used to lower blood cholesterol.

Saccharomyces cerevisiae, yeast is used for the industrial production of alcohol.

Penicillium notatum is a fungus used for the production of the antibiotic penicillin.

Trichoderma polysporum is used for the production of cyclosporin A is used as an immuno-suppressing agent and is given to patients after transplant surgeries.

Topic: Biology, Microbes in Human Welfare, NEET, NEET 2020 (Phase 2)
Cyclosporin is used

Options:
A As anti-allergic agent
B As immunosuppressant
C As clot buster
D As an inhibitor of cholesterol synthesis

The correct answer is:
As immunosuppressant

Solution:
Cyclosporine is used to prevent organ rejection in people who have received a liver, kidney, or heart transplant. It is usually taken along with other medications to allow your new organ to function normally. Cyclosporine belongs to a class of drugs known as immunosuppressants.

Topic: Biology, Microbes in Human Welfare, NEET
Cyclosporine-A an immunosuppressive agent is produced by:

Options:
A Clostridium butylicum
B Trichoderma polysporum
C Aspergillus niger
D Monascus purpureus

The correct answer is:
Trichoderma polysporum

Solution:
Trichoderma polysporum, a type of fungus, produces cyclosporin A (an immunosuppressive agent).
Aspergillus niger is utilized in the production of citric acid.
Clostridium butylicum is is used to produce butyric acid.
Monascus purpureus is used to produce statins.

Topic: Biology, Microbes in Human Welfare, NEET
Cymose inflorescence is present in

Options:
A Solanum
B Sesbania
C Trifolium
D Brassica

The correct answer is:
Solanum

Solution:
Cymose inflorescence is also called definite or determinate inflorescence because the growing point of the peduncle is used up in the formation of a flower. Further growth of the flowering axis is continued by ove or more lateral branches (peduncles) which also end in flowers. This type of inflorescence is found in family-Solanaceae.

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2012 (Screening)
Cystic fibrosis is an autosomal recessive disease. In an island having a population of 200 people, 98 people suffer from cystic fibrosis. How many people are carriers of this disease?

Options:
A 42
B 84
C 18
D 64

The correct answer is:
84

Solution:
Cystic fibrosis is caused due to a recessive gene. Individuals suffering from this disease are homozygous recessive. Applying Hardy Weinberg's equation here, q2=98200 =0.49. Hence, q=0.7. Thus p=1 -q=0.3.
If the carrier of this disease is heterozygous individuals. Their proportion will be 2pq = 2Ã 0.7Ã 0.3 = 0.42 . In this population, carriers will be 0.42Ã200 = 84.

Topic: Biology, Evolution, NEET
Cytochrome c is a small protein attached to the

Options:
A outer surface of the outer mitochondrial membrane and acts as a mobile carrier for transfer of electrons between complex II and III
B inner surface of the outer mitochondrial membrane and acts as a mobile carrier for transfer of electrons between complex III and IV
C outer surface of the inner mitochondrial membrane and acts as a mobile carrier for transfer of electrons between complex III and IV
D inner surface of the inner mitochondrial membrane and acts as a mobile carrier for transfer of electrons between complex III and IV

The correct answer is:
outer surface of the inner mitochondrial membrane and acts as a mobile carrier for transfer of electrons between complex III and IV

Solution:
The ETS contains various cytochromes. Cytochrome bc1 complex (complex III) and cytochrome aa3 complex (complex IV) are attached to the inner mitochondrial membrane. Cytochrome c is a small protein attached to the outer surface of the inner membrane and acts as a mobile carrier for transfer of electrons between complex III and IV.

Topic: Biology, Respiration in Plants, NEET
Cytochrome is a

Options:
A Mg pyrole ring
B Fe porphyrin ring
C Nucleotide
D Alloy of nichrome

The correct answer is:
Fe porphyrin ring

Solution:
Cytochromes are iron-containing heme prosthetic groups. They are most important electron carries of the respiratory chain, which are related with each other by the presence of a bound heme group whose iron atom changes from ferric (Fe+3) state to ferrous (Fe+2) state when it accepts an electron. The heme group of cytochromes consists of a porphyrin ring holding an iron atom its four nitrogens.

Topic: Biology, Mineral Nutrition, NEET
Cytochromes are found in:

Options:
A Matrix of mitochondria
B Outer wall of mitochondria
C Cristae of mitochondria
D Lysosomes

The correct answer is:
Cristae of mitochondria

Solution:
Cytochromes are the iron-containing electron acceptors, which are present on the inner mitochondrial membrane, called cristae, helpful in ETS. They are miniature biochemical factories where foodstuff is oxidised to CO2 and H2O.

Topic: Biology, Respiration in Plants, NEET, NEET 2015 (Phase 1)
Cytochromes are found in:

Options:
A Matrix of mitochondria
B Outer wall of mitochondria
C Cristae of mitochondria
D Lysosomes

The correct answer is:
Cristae of mitochondria

Solution:
Cytochromes are the Iron-containing electron acceptors, which are present on the inner mitochondrial membrane, called cristae, helpful in ETS.

Topic: Biology, Respiration in Plants, NEET
Cytokinins were discovered as

Options:
A Ethylene
B Abscisic acid
C Ethanol
D Kinetin

The correct answer is:
Kinetin

Solution:
Kinetin (a modified form of adenine, a purine) is obtained from the autoclaved herring sperm DNA. Kinetin does not occur naturally in plants. Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn-kernels and coconut milk. Since the discovery of zeatin, several naturally occurring cytokinins and some synthetic compounds with cell division promoting activity have been identified. Natural cytokinins are synthesized in regions where rapid cell division occurs, for example, root apices, developing shoot buds, young fruits, etc.

Topic: Biology, Plant - Growth and Development, NEET
Cytoplasmic streaming could be seen in ?

Options:
A Hydrilla Leaf due to movement of mitochondria
B Hydrilla Leaf due to movement of chromoplast
C Hydrilla Stem due to movement of Chloroplast
D Hydrilla Leaf due to movement of chloroplast

The correct answer is:
Hydrilla Leaf due to movement of chloroplast

Solution:
Cytoplasmic streaming could be seen in Hydrilla leaf due to movement of Chloroplast.

Topic: Biology, Transport in Plants, NEET
Cytoskeleton is made up of

Options:
A calcium carbonate granules
B callose deposits
C cellulosic microfibrils
D proteinaceous filaments

The correct answer is:
proteinaceous filaments

Solution:
The cytoplasm of all eukaryotic cells is criss-crossed by a network of protein fibres that support the shape of the cell and anchor organelles to fixed locations. It is a dynamic system with three types of fibres-actin filaments, microtubule and intermediate filament.

Topic: Biology, Cell - The Unit of Life, NEET, NEET 2009 (Screening)