datavorous/entrance-exam-dataset huggingface dataset:
Which of the following structural order of ganglions are correctly represented in cockroaches?

Options:
A Supra-pharyngeal ganglion, supra-oesophageal ganglion, sub-oesophageal, pro-thoracic ganglion, meta-thoracic ganglion, meso-thoracic ganglion, 1-6 abdominal ganglion.
B Sub-pharyngeal ganglion, supra-oesophageal ganglion, meta-thoracic ganglion, meso-thoracic ganglion, pro-thoracic ganglion, 1-6 abdominal ganglion.
C Sub-oesophageal ganglion, supra-oesophageal ganglion, sub-oesophageal, meso-thoracic ganglion, pro-thoracic ganglion, meta-thoracic ganglion, 1-6 abdominal ganglion.
D Supra-oesophageal ganglion, sub-oesophageal, pro-thoracic ganglion, meso-thoracic ganglion, meta-thoracic ganglion, 1-6 abdominal ganglion.

The correct answer is:
Supra-oesophageal ganglion, sub-oesophageal, pro-thoracic ganglion, meso-thoracic ganglion, meta-thoracic ganglion, 1-6 abdominal ganglion.

Solution:
Cockroach's brain or the central nervous system consists of the supra-oesophageal or cerebral ganglia, sub-oesophageal ganglia and circum oesophageal connectives in the head and a double ganglionated ventral nerve cord in the thorax and abdomen. The brain or supra-oesophageal ganglia are a pair of large, closely apposed ganglia in the head.

Looking for more such questions to practice?

Download the MARKS App - The ultimate prep app for IIT JEE &
NEET with chapter-wise PYQs, revision notes, formula sheets,
custom tests & much more.

Use on iOS or Desktop Download from Google Play

Topic: Biology, Structural Organisation in Animals, NEET
Which of the following structure contains sp-hybridized carbon atoms?

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

The correct answer is:
I, II and IV

Solution:

Topic: Chemistry, General Organic Chemistry, JEE Main
Which of the following structure in the normal human heart generates action potential to initiate a cardiac cycle?

Options:
A AV node
B SA node
C Purkinjefibres
D Bundle ofHis

The correct answer is:
SA node

Solution:
The SA node (sino-atrial node) is a specialised nodal cardiac tissue which is present in the right upper corner of right atrium. It can generate the maximum number of actionpotentials i.e.70-75 per min, and is responsible for initiating and maintaining rhythmic contractile activity of the heart.

Topic: Biology, Body Fluids and Circulation, NEET
Which of the following structure is having maximum autorhythmicity in the normal human heart?

Options:
A Purkinje fibres
B Bundle of His
C AV node
D SA node

The correct answer is:
SA node

Solution:
The SA node (sino-atrial node) is a specialised nodal cardiac tissue which is present in the right upper corner of right atrium. It can generate the maximum number of action potentials i.e.70-75 per min, and is responsible for initiating and maintaining rhythmic contractile activity of the heart.

Topic: Biology, Body Fluids and Circulation, NEET
Which of the following structure is homologous to penis?

Options:
A mons pubis
B labia majora
C labia minora
D clitoris

The correct answer is:
clitoris

Solution:
Penis in males is the main copulatory organ. It carries sperms and urine. It delivers sperms into the female body so that the sperms can fertilize the ovum. Penis is able to enter the female vagina because it is made up of three erectile tissues. These are two corpora cavernosa and one corpora spongiosum through which urethra passes. This erectile tissue becomes engorged with blood and thus the penis becomes hard and stiff. Such erectile tissue is seen in females too and is known as clitoris. The erectile tissue present is corpora cavernosa. Clitoris is present at the anterior junction of labia minora. Hence clitoris is homologous to the penis. Homologous organs are those organs that are similar in embryonic origin but different in function.

Topic: Biology, Human Reproduction, NEET
Which of the following structures is composed of cuboidal epithelium and contains microvilli?

Options:
A Glomerulus
B Ducts of glands
C Proximal convoluted tubule of nephron
D Distal convoluted tubule of nephron

The correct answer is:
Proximal convoluted tubule of nephron

Solution:
The cuboidal epithelium is composed of a single layer of cube-like cells. This is commonly found in ducts of glands and tubular parts of nephrons in kidneys and its main functions are secretion and absorption. The epithelium of proximal convoluted tubule (PCT) of the nephron in the kidney has microvilli.

Topic: Biology, Excretory Products and their Elimination, NEET
Which of the following structures is the correct Haworth representation of D-aldose?

Options:
A
B
C
D

The correct answer is:

Solution:
The Haworth representation of D-aldose can be given as

Topic: Chemistry, Biomolecules, JEE Main
Which of the following structures is the most preferred and hence of lowest energy for $\mathrm{SO}_3$ ?

Options:
A

B

C

D

The correct answer is:

Solution:
Formal charges help in the selection of the lowest energy structure from a number of possible Lewis structures for a given species. Generally the lowest energy structure is the one with the smallest formal charges on the atoms.
Formal charge on an atom :
$=$ total no. of valence electrons-non-bonding electrons $-\frac{1}{2} \times$ bonding electrons.
For Lewis structure of $\mathrm{SO}_3$
Formal charge on $\mathrm{S}$ atom $=6-0-\frac{1}{2} \times 12=0$ Formal charge on three $\mathrm{O}$ atoms
$$
=6-4-\frac{1}{2} \times 4=0
$$

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2011 (Mains)
Which of the following structures play a significant role in maintaining osmolarity in mammals?

Options:
A Henle's loop and vasa recta
B Vasa recta and renal pelvis
C Vasa recta and glomerulus
D Renal pelvis and collecting duct

The correct answer is:
Henle's loop and vasa recta

Solution:
Mammals have the ability to produce concentrated urine. The Henleâs loop and vasa recta play a significant role in this. The flow of filtrate in the two limbs of Henleâs loop is in opposite directions and thus forms a counter current. The flow of blood through the two limbs of vasa recta is also in a counter current pattern. The proximity between the Henleâs loop and vasa recta, as well as the counter current in them help in maintaining an increasing osmolarity. transport of substances facilitated by the special arrangement of Henleâs loop and vasa recta is called the counter current mechanism. This mechanism helps to maintain a concentration gradient.

Topic: Biology, Excretory Products and their Elimination, NEET
Which of the following structures represents thymine ?

Options:
A

B

C

D

The correct answer is:

Solution:
The correct structure of thymine is

Topic: Chemistry, Biomolecules, JEE Main, JEE Main 2013 (22 Apr Online)
Which of the following substance is used as dehydrating agent in laboratory

Options:
A Calcium chloride
B Sodium chloride
C Sodium carbonate
D Potassium nitrate

The correct answer is:
Calcium chloride

Solution:
$\mathrm{CaCl}_2$ because it is hygroscopic

Topic: Chemistry, s Block Elements, JEE Main
Which of the following substance is used in making soap?

Options:
A Vegetable Oil
B Mobil Oil
C Kerosene Oil
D Cutting Oil

The correct answer is:
Vegetable Oil

Solution:
- The process involved in making soap is called Saponification.
- Saponification is the chemical reaction that occurs when a vegetable oil or animal fat is mixed with a strong alkali.
- The products of the Saponification reaction are soap and glycerin.

Topic: Chemistry, Chemistry in Everyday Life, JEE Main
Which of the following substances are secreted by tubular cells into the filtrate during urine formation?

Options:
A Glucose, aminoacids, Na+
B H+, K+ , aminoacids
C Na+, H+ , aminoacids
D K+, H+ , ammonia

The correct answer is:
K+, H+ , ammonia

Solution:
During urine formation, the tubular cells secrete substances like H+, K+ and ammonia into the filtrate. Tubular secretion is also an important step in urine formation as it helps in the maintenance of ionic and acid base balance of body fluids.

Topic: Biology, Excretory Products and their Elimination, NEET
Which of the following substances can be reabsorbed by the DCT?

Options:
A Na+ , Water and HCO3-
B Na+, H+, K+ , Water and HCO3-
C Na+, H+ , Water and HCO3-
D Na+, H+ , Water and HCO3-

The correct answer is:
Na+ , Water and HCO3-

Solution:
Reabsorption is the process where the renal tubules reabsorb a good volume of substances from the glomerular filtrate. DCT is the Distal Convoluted Tubule which does the role of reabsorption water, sodium and bicarbonate ions. It also secretes potassium and hydrogen ions to maintain the pH and balance of sodium-potassium in the blood.

Topic: Biology, Excretory Products and their Elimination, NEET
Which of the following substances consists of only one element

Options:
A Marble
B Sand
C Diamond
D Glass

The correct answer is:
Diamond

Solution:
Diamond made up of carbon only.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, JEE Main
Which of the following sugars is not found in plants?

Options:
A sucrose
B glucose
C lactose
D fructose

The correct answer is:
lactose

Solution:
Sucrose, glucose and fructose, all the three sugars are found in plants. Sucrose is the commercial sugar which is obtained from sugarcane. Glucose is the main respiratory substrate in plants and animals. Fructose can also function similarly. Moreover fructose is also the common fruit sugar.
Lactose or milk sugar is found naturally in milk. It is reducing sugar which is formed in the mammary glands of mammal through condensation of two hexose molecules.

Topic: Chemistry, Biomolecules, AIIMS, AIIMS 2009
Which of the following suggests the main role of bacteria in the carbon cycle?

Options:
A photo-oxidation
B photosynthesis
C carbon fixation
D decomposing

The correct answer is:
decomposing

Solution:
Bacteria are important decomposers in nature. Type play an important role in the recycling of nutrients by causing the breakdown of dead organic matter thus plays an important role in the carbon cycle. The most important bacteria involved in the carbon cycle is Pseudomonas denitrificans.

Topic: Biology, Ecosystem, NEET
Which of the following supports a dense population of plankton and littoral vegetation?

Options:
A Oligotrophic
B Eutrophic
C Lithotrophic
D Agroecotrophic

The correct answer is:
Eutrophic

Solution:
Eutrophication means nutrient enrichment. The main factor that caused eutrophication is the release of large amount of phosphate into water body.

Topic: Biology, Ecosystem, JIPMER, JIPMER 2014
Which of the following system of units is not based on units of mass, length and time alone

Options:
A SI
B MKS
C FPS
D CGS

The correct answer is:
SI

Solution:
Because in S.I. system there are seven fundamental quantities.

Topic: Physics, Units and Dimensions, JEE Main
Which of the following terms describe human dentition?

Options:
A Pleurodont, Monophydont, Homodont
B Thecodont, Diphyodont, Heterodont
C Thecodont, Diphyodont, Homodont
D Pleurodont, Diphyodont, Heterodont

The correct answer is:
Thecodont, Diphyodont, Heterodont

Solution:
Human dentition is thecodont, diphyodont and heterodont. In humans, two types of teeth are found: milk or deciduous teeth and permanent teeth. Thus, they have diphyodont teeth. The teeth are thecodont, i.e. they remain embedded in the sockets of the jaw bones. Men have four types of teeth; incisors, canines, premolars and molars, i.e., heterodont teeth.

Pleurodont teeth refers to the dentition where teeth are fused to the inner edge of the jawbone. This type of dentition is normally found in reptiles.
Homodont refers to only one or similar type of teeth. It is found in porpoise.

Topic: Biology, Digestion and Absorption, NEET, NEET 2018
Which of the following terms is not related with colloids

Options:
A Dialysis
B Ultrafiltration
C Wavelength
D Brownian movement

The correct answer is:
Wavelength

Solution:
Correct option is 3. Wavelength
Brownian motion is the random motion of particles suspended in a fluid resulting from their collision with the fast-moving molecules in the fluid.
Dialysis is the separation of colloids from dissolved ions or molecules of small dimensions, or crystalloid, in a solution.
Ultrafiltration is used to separate the larger colloidal particles from the fluid.
Wavelength is not associated with colloids.

Topic: Chemistry, Surface Chemistry, JEE Main
Which of the following tests cannot be used for identifying amino acids?

Options:
A Biuret test
B Xanthoproteic test
C Barfoed test
D Ninhydrin test

The correct answer is:
Barfoed test

Solution:
Barfoed’s test is used for distinguishing monosaccharides from reducing disaccharides. Monosaccharides usually react in about 1-2 minute while the reducing disaccharides take much longer time between 7-12 minutes to react with the reagent. Brick red color is obtained in this test which is due to formation of cuprous oxide

Barfoed's test is basically used for detecting the presence of monosaccharides.

Topic: Chemistry, Biomolecules, JEE Main, JEE Main 2019 (10 Jan Shift 2)
Which of the following tissue systems constitute bulk of the plant body?

Options:
A Epidermal tissue system
B Ground tissue system
C Vascular tissue system
D Both A and C

The correct answer is:
Ground tissue system

Solution:
The outermost covering of the whole plant body forms the epidermal tissue system that includes the epidermal cells and appendages with stomata. This system basically provides protection to the main plant body.
Vascular tissue system is made of complex tissues having more than one type of cells working together as one unit. Main function of the unit is transport.
All the tissues excluding epidermal and vascular come in the category of ground tissue system that forms the bulk of the plant body. Simple tissues like parenchyma, collenchyma and sclerenchyma form part of the ground tissue system.

Topic: Biology, Anatomy of Flowering Plants, NEET
Which of the following transformation least energy is required?

Options:
A F(g)-→F(g)+e-
B P(g)-→P(g)+e-
C Sg-→Sg+e-
D Clg-→Clg+e-

The correct answer is:
P(g)-→P(g)+e-

Solution:
If we consider the opposite process
AFg+e-→F(g)- ; ∆H1
BPg+e-→Pg- ; ∆H2
CSg+e-→Sg- ; ∆H3
DClg+e-→Clg- ; ∆H4
Order of energy releases is : ∆H4>∆H1>∆H3>∆2
So, P(g)-→P(g)+e- ; Requires least energy.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, JEE Main
Which of the following transitions have minimum wavelength

Options:
A $n_4 \rightarrow n_1$
B $n_2 \rightarrow n_1$
C $n_4 \rightarrow n_2$
D $n_3 \rightarrow n_1$

The correct answer is:
$n_4 \rightarrow n_1$

Solution:
For $n_4 \rightarrow n_1$, greater transition, greater the energy difference, lesser will be the wavelength.

Topic: Chemistry, Structure of Atom, JEE Main
Which of the following transitions in hydrogen atoms emit photons of highest frequency?

Options:
A
$n=2$ to $n=6$

B
$n=6$ to $n=2$

C
$n=2$ to $n=1$

D
$n=1$ to $n=2$

The correct answer is:
$n=2$ to $n=1$

Solution:
$h v=\operatorname{Rhcz}^2\left(\frac{1}{\mathrm{n}_1^2}-\frac{1}{\mathrm{n}_2^2}\right)$

Topic: Physics, Atomic Physics, JEE Main, JEE Main 2007
Which of the following treatment will convert starch directly into glucose?

Options:
A Heating with dilute H2SO4
B Fermentation by diastase
C Fermentation by zymase
D Heating with dilute NaOH

The correct answer is:
Heating with dilute H2SO4

Solution:
Fermentation by diastase will convert starch into maltose but not into glucose.
Zymase does not effect starch.
Further, dilute NaOH will not hydrolyse starch because the various glucose units in it are linked to each other by glycosidic (ether) linkage which are resistant to hydrolysis by NaOH. Thus only dilute H2SO4 will hydrolyse starch into glucose.
C6H10O5xStarch→ nH2O enzymesC6H12O6Glucose

Topic: Chemistry, Biomolecules, JEE Main
Which of the following trends is observed as you move down the group from Be to Ba in terms of electropositive character?

Options:
A Electropositive character decreases
B Electropositive character remains constant
C Electropositive character increases
D Electropositive character becomes negative

The correct answer is:
Electropositive character increases

Solution:
As you move down the group from Be to Ba, the electropositive character of the elements increases. This is because the ionization enthalpy decreases, making it easier for these elements to lose electrons and exhibit strong electropositive behavior.

Topic: Chemistry, s Block Elements, NEET
Which of the following trivalent ion has the largest atomic radii in the lanthanide series

Options:
A $La$
B $\mathrm{Ce}$
C $P m$
D $Lu$

The correct answer is:
$La$

Solution:
Lanthanum is the first element of Lanthanide series so size decreases with increase in atomic number so has the largest atomic radii.

Topic: Chemistry, d and f Block Elements, JEE Main
Which of the following trivalent ion has the largest atomic radii in the lanthanide series

Options:
A $La$
B $\mathrm{Ce}$
C $P m$
D $Lu$

The correct answer is:
$La$

Solution:
Lanthanum is the first element of Lanthanide series so size decreases with increase in atomic number so has the largest atomic radii

Topic: Chemistry, d and f Block Elements, JEE Main
Which of the following type of tissue is characterized by the following statements?

A. It is present in the dry surface of the skin and the moist surface of buccal cavity.
B. Its main function is to provide resistance to mechanical and chemical stress.

Options:
A Compound epithelium
B Simple squamous epithelium
C Simple Ciliated epithelium
D Glandular epithelium

The correct answer is:
Compound epithelium

Solution:
The compound epithelium is made of more than one layer (multi-layered) of cells and thus has a limited role in secretion and absorption. Their main function is to provide protection against chemical and mechanical stresses. They cover the dry surface of the skin, the moist surface of the buccal cavity, pharynx, the inner lining of ducts of salivary glands and of pancreatic ducts.

Topic: Biology, Structural Organisation in Animals, NEET
Which of the following undergoes nucleophilic substitution exclusively by \( \mathrm{S}_{\mathrm{N}} 1 \) mechanism?

Options:
A Benzyl chloride
B Ethyl chloride
C Chlorobenzene
D Isopropyl chloride

The correct answer is:
Benzyl chloride

Solution:
Benzyl chloride undergoes nucleophilic substitution reaction by SN1 mechanism because formation of carbocation is stabilised by resonance effect.

Ethyl chloride will show SN2 reaction.

Chlorobenzene cannot show SN1 and SN2 both because of partial double bond character due to resonance.

Isopropyl chloride is secondary chloride therefore it can show both SN1 and SN2.

Topic: Chemistry, Haloalkanes and Haloarenes, JEE Main
Which of the following undergoes reaction with $50 \%$ sodium hydroxide solution to give the corresponding alcohol and acid?

Options:
A
Phenol

B
Benzoic acid

C
Butanal

D
Benzaldehyde

The correct answer is:
Benzaldehyde

Solution:
Benzaldehyde does not contain $\alpha$ - hydrogen. Hence goes for cannizarro's reaction forming alcohol and acid

Topic: Chemistry, Carboxylic Acid Derivatives, JEE Main
Which of the following undergoes reaction with $50 \%$ sodium hydroxide solution to give the corresponding alcohol and acid?

Options:
A
Phenol

B
Benzoic acid

C
Butanal

D
Benzaldehyde

The correct answer is:
Benzaldehyde

Solution:
Benzaldehyde does not contain $\alpha$ - hydrogen. Hence goes for cannizarro's reaction forming alcohol and acid

Topic: Chemistry, Carboxylic Acid Derivatives, JEE Main, JEE Main 2004
Which of the following units denotes the dimensions $\mathrm{ML}^2 / \mathrm{Q}^2$, where $\mathrm{Q}$ denotes the electric charge?

Options:
A
Weber $(\mathrm{Wb})$

B
$\mathrm{Wb} / \mathrm{m}^2$

C
Henry $(\mathrm{H})$

D
$\mathrm{H} / \mathrm{m}^2$

The correct answer is:
Henry $(\mathrm{H})$

Solution:
Henry $(\mathrm{H})$

Topic: Physics, Units and Dimensions, JEE Main, JEE Main 2006
Which of the following, upon treatment with tert-BuONa followed by addition of bromine water, fails to decolourize the colour of bromine?

Options:
A
B
C
D

The correct answer is:

Solution:
In the options, they have acidic β−H so an elimination reaction takes place and alkene will be formed.

And the formed alkene decolourizes the bromine water {E⊕ addition reaction of an alkene by HOBr} while in 4 it does not have β−H so, there is no formation of alkene, hence does not decolourize Br2 water.

Topic: Chemistry, Haloalkanes and Haloarenes, JEE Main, JEE Main 2017 (02 Apr)
Which of the following used for the conversion of 2-hexyne into trans-2-hexane

Options:
A $\mathrm{H}_2 / \mathrm{Pd} / \mathrm{BaSO}_4$
B $\mathrm{H}_2, \mathrm{PtO}_2$
C $\mathrm{NaBH}_4$
D $\mathrm{Li}-\mathrm{NH}_3 / \mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}$

The correct answer is:
$\mathrm{Li}-\mathrm{NH}_3 / \mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}$

Solution:
The partial reduction of alkynes by active metal in liquid ammonia takes place through trans vinylic anion which ultimately produces trans alkene.

Topic: Chemistry, Hydrocarbons, JEE Main
Which of the following velocity-time graphs represent uniform motion

Options:
A

B

C

D

The correct answer is:

Solution:
In uniform motion, the speed of the body remains constant i.e, the magnitude of the velocity does not change as there is no tangential acceleration. Since, acceleration is the slope of the velocity-time graph, if it is zero, then the slope will also be zero. Therefore, the graph will be nothing but a straight horizontal line with zero slope.

Topic: Physics, Motion In One Dimension, JEE Main
Which of the following vitamin is helpful in the blood clotting?

Options:
A Vitamin C
B Vitamin E
C Vitamin K
D Vitamin B

The correct answer is:
Vitamin K

Solution:
Vitamin helpful in the blood clotting is Vitamin K.

Vitamin K is a fat soluble vitamin required for normal blood clotting. Its deficiency leads to slow or delayed blood clotting and haemorrhage (blood loss). Vitamin K is required for synthesis of prothrombin in the liver where the vitamin K-dependent carboxylation in prothrombin synthesis occurs.

Note: Question has been slightly modified for its correctness.

Topic: Chemistry, Biomolecules, JEE Main
Which of the following vitamin is helpful in the blood clotting?

Options:
A Vitamin C
B Vitamin E
C Vitamin K
D Vitamin B

The correct answer is:
Vitamin K

Solution:
Vitamin helpful in the blood clotting is Vitamin K.

Vitamin K is a fat soluble vitamin required for normal blood clotting. Its deficiency leads to slow or delayed blood clotting and haemorrhage (blood loss). Vitamin K is required for synthesis of prothrombin in the liver where the vitamin K-dependent carboxylation in prothrombin synthesis occurs.

Note: Question has been slightly modified for its correctness.

Topic: Chemistry, Biomolecules, JEE Main, JEE Main 2021 (26 Feb Shift 1)
Which of the following vitamins cannot be stored in the body?

Options:
A A
B C
C E
D K

The correct answer is:
C

Solution:
Vitamins are classified into two groups depending upon their solubility in water or fat.

Fat soluble vitamins: Vitamins which are soluble in fat and oils but insoluble in water are kept in this group. These are vitamins A, D, E and K. They are stored in liver and adipose (fat storing) tissues.

Water soluble vitamins: B group vitamins and vitamin C are soluble in water. Water soluble vitamins must be supplied regularly in diet because they are readily excreted in urine and cannot be stored (except vitamin B12) in our body.

Topic: Chemistry, Biomolecules, JEE Main