datavorous/entrance-exam-dataset huggingface dataset:
Which of the following events does not take place after the degeneration of the generative cell in pollen grain?

Options:
A Entry of pollen tube inside the embryosac
B Fertilization
C Only triple fusion but not syngamy
D Neither entry of pollen-tube inside the embryosac nor fertilization

The correct answer is:
Fertilization

Solution:
Pollen grain is male gametophyte which consists of a vegetative cell and a generative cell. Vegetative cell is rich in reserve food and it controls the formation of pollen tube, while generative divides to form two male gametes. If generative cell is degenerated than male gametes are not formed hence fertilization cannot occur.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Which of the following events occur at a faster rate?

Options:
A The suction of water and minerals due to transpiration pull
B Cyclosis in cell cytoplasm
C Sugar transport in phloem
D Distribution of hormones from one part to other

The correct answer is:
The suction of water and minerals due to transpiration pull

Solution:
The water molecules have a great mutual attraction with each other, or in other words, they have tremendous cohesive power which is sometimes as much as 350 atmospheres.

Topic: Biology, Transport in Plants, NEET
Which of the following events take place during post-transcriptional modification in eukaryotes?

Options:
A Exons are removed from primary transcript.
B 7-methyl guanosine cap is added at 3' end of RNA transcript
C Addition of poly A segmant at 5' end of trnascript.
D In tailing, adenylated residues are added in a template independent manner.

The correct answer is:
In tailing, adenylated residues are added in a template independent manner.

Solution:
The second complexity is that the primary transcripts contain both the exons and the introns and are non-functional. Hence, it is subjected to a process called splicing where the introns are removed and exons are joined in a defined order. hnRNA undergoes additional processing called as capping and tailing. In capping an unusual nucleotide (methyl guanosine triphosphate) is added to the 5'-end of hnRNA. In tailing, adenylate residues (200-300) are added at 3'-end in a template independent manner. It is the fully processed hnRNA, now called mRNA, that is transported out of the nucleus for translation.

Topic: Biology, Molecular Basis of Inheritance, NEET
Which of the following evidences does not favour the Lamarckian concept of inheritance of acquired characters?

Options:
A Lack of pigments in cave-dwelling animals.
B Melanization in peppered moth
C Absence of limbs in snakes
D Presence of webbed toes in aquatic birds

The correct answer is:
Melanization in peppered moth

Solution:
Industrial melanism is an example which explains the phenomenon of natural selection explained by Darwin. In this, it was seen that the white moths survived before industralisation but after industrialisation this survival was seen among dark coloured moths. This example did not explain any acquired characters explained by Lamarck. In caves due to absence of light , the animals lack pigments. Snakes show presence of rudimentary pelvic girdle and also traces of hind limbs. Aquatic birds show presence of webbed toes. All these examples explain phenomenon of acquired characters that was explained by Lamarckism.

Topic: Biology, Evolution, NEET
Which of the following evolutionary stage of humans has a cranial capacity between 650â800cc?

Options:
A Australopithecus
B Homo habilis
C Homo erectus
D Homo sapiens

The correct answer is:
Homo habilis

Solution:
The first human-like being, the hominid, was Homo habilis. The brain capacities were between 650–800cc. They probably did not eat meat.

Topic: Biology, Evolution, NEET
Which of the following examples can be considered as homologous organs or examples of homology?

Options:
A Brain of vertebrates
B Heart of vertebrates
C forelimb of mammals
D All of the above

The correct answer is:
All of the above

Solution:
Organs or structures having similar or common origin but perform same or different functions in different organism are called homologous organs. Homology indicates common ancestory.
Examples: Fore limbs of mammals, heart of vertebrates and brain of vertebrates.

Topic: Biology, Evolution, NEET
Which of the following examples of intragenic inheritance was discovered by Mendel?

Options:
A Co-dominance
B Incomplete dominance
C Complete dominance
D None

The correct answer is:
None

Solution:
The intragenic inheritance was discovered after Mendel's death. Intragenic or inter-allelic gene interaction occurs between alleles of the same genes, e.g., incomplete dominance, co-dominance and multiple alleles.

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following examples represent periodic motion?

Options:
A A swimmer completing one (return) trip from one bank of a river to the other and back.
B Movement of particles in the air
C A hydrogen molecule rotating about its centre of mass.
D An arrow released from a bow.

The correct answer is:
A hydrogen molecule rotating about its centre of mass.

Solution:
Correct Option is : (C)
A hydrogen molecule rotating about its centre of mass.

Topic: Chemistry, Oscillations, NEET
Which of the following examples represents a central force and a non-central force, respectively?

Options:
A Gravitational force of a point mass, electrostatic force due to a point charge
B Electrostatic force due to a point charge, magnetic force between two current carrying loops
C spin-dependent nuclear forces, magnetic force between two current carrying loops
D magnetic force between two current carrying loops, spin-dependent nuclear forces

The correct answer is:
Electrostatic force due to a point charge, magnetic force between two current carrying loops

Solution:
Correct Option is : (B)
Electrostatic force due to a point charge, magnetic force between two current carrying loops

Topic: Chemistry, Gravitation, NEET
Which of the following examples represents a one-dimensional motion where a particle moving along the positive x-direction periodically comes to rest and moves forward?

Options:
A x(t) = t - sin(t)
B x(t) = tsin(t)
C x(t) = cos(t)
D x(t) = t² - sin(t)

The correct answer is:
x(t) = t - sin(t)

Solution:
Correct Option is : (A)
x(t) = t - sin(t)

Topic: Chemistry, Motion In One Dimension, NEET
Which of the following examples represents (nearly) simple harmonic motion and which represents periodic but not simple harmonic motion?

Options:
A the rotation of Earth about its axis.
B motion of an oscillating mercury column in a U-tube.
C motion of a ball bearing inside a smooth curved bowl, when released from the topmost point.
D general vibrations of a polyatomic molecule about its equilibrium position.

The correct answer is:
motion of an oscillating mercury column in a U-tube.

Solution:
Correct Option is : (B)
motion of an oscillating mercury column in a U-tube.

Topic: Chemistry, Oscillations, NEET
Which of the following examples show monocarpellary, unilocular ovary with many ovules?
A. Sesbania
B. Brinjal
C. Indigofera
D. Tobacco
E. Asparagus
Choose the correct answer from the options given below :

Options:
A B and E only
B C, D and E only
C A, B and D only
D A and C only

The correct answer is:
A and C only

Solution:
Monocarpellary, unilocular ovary with many ovules is the characteristic feature of the members of the family Fabaceae. Sesbania and Indigofera are the members of this family. Brinjal and tobacco belong to the family Solanaceae whereas Asparagus belongs to the family Liliaceae.

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2024 (Re-NEET)
Which of the following exhibits greater coagulation power towards a negative colloid?

Options:
A ZnSO4
B Na3PO4
C AlCl3
D K4FeCN6

The correct answer is:
AlCl3

Solution:
Negative colloid is coagulated by positive ion or vice-versa. Greater the valency of coagulating ion, greater will be coagulating power according to Hardy-Schulze rule.
a    ZnSO 4 → Zn 2+ + SO 4 2−
b    Na 3 PO 4 →3 Na + + PO 4 3−
c    AlCl 3 → Al 3+ +3 Cl −
d    K 4 Fe CN 6 →4 K + + Fe CN 6 4−
Since, in AlCl3, the valency of positive ion (coagulation ion) is highest, it is the most powerful coagulating agent among the given to coagulate the negative colloid.

Topic: Chemistry, Surface Chemistry, NEET
Which of the following exhibits only +3 oxidation state?

Options:
A U
B Th
C Ac
D Pa

The correct answer is:
Ac

Solution:
Here Ac shows only +3 oxidation state as electronic configuration of actinium is 6d17s2 so it has only 3 electrons available to lose.

Topic: Chemistry, d and f Block Elements, NEET
Which of the following exhibits tautomerism?

Options:
A CH32NH
B CH33CNO
C R3CNO2
D RCH2NO2

The correct answer is:
RCH2NO2

Solution:

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following exhibits the greatest freezing point lowering per mole of solute?

Options:
A 0.01 m NaCl
B 0.1 m NaCl
C 0.01 m C2H5OH
D 0.1 m C2H5OH

The correct answer is:
0.1 m NaCl

Solution:
Lowering in freezing point is a colligative property, colligative property depends on the number of molecule atom or ions and molality. In 0.1 m NaCl. Molality is maximum out of four and NaCl dissociates into Na+,Cl- (i = 2).
Colligative property ∝m×i
So, 0.1 m NaCl > 0.1 m C2H5OH > 0.01 m NaCl > 0.01 m C2H5OH

Topic: Chemistry, Solutions, NEET
Which of the following exist as bcc?

Options:
A W
B Fe
C Co
D Ni

The correct answer is:
W

Solution:
Correct Option is : 1
W

Topic: Chemistry, d and f Block Elements, NEET
Which of the following exist in+5 oxidation state?

Options:
A Actinium
B Americium
C Fermium
D Lawrencium

The correct answer is:
Americium

Solution:
Correct Option is : 2
Americium

Topic: Chemistry, d and f Block Elements, NEET
Which of the following exists as covalent crystals in the solid state ?

Options:
A Sulphur
B Phosphorus
C Iodine
D Silicon

The correct answer is:
Silicon

Solution:
Silicon is covalent network solid.
Each Si atom is in sp3 hybridisation.
Sulphur (S8) â molecular solid
phosphorus (P4) â molecular solid
Iodine (I2) â molecular solid

Topic: Chemistry, Solid State, NEET
Which of the following exists in +7 oxidation state?

Options:
A Plutonium
B Thorium
C Uranium
D Nobelium

The correct answer is:
Plutonium

Solution:
Correct Option is : 1
Plutonium

Topic: Chemistry, d and f Block Elements, NEET
Which of the following explains the formation of a chemical bond correctly?

Options:
A Chemical bonds are created when two atoms are brought together at high temperatures.
B Chemical bonds form through the sharing or transfer of electrons between two or more atoms, resulting in a stable arrangement of electrons in the outermost energy level.
C Chemical bonds are purely the result of electrostatic attraction between oppositely charged ions.
D Chemical bonds occur when atoms collide and release energy in the form of light or heat.

The correct answer is:
Chemical bonds form through the sharing or transfer of electrons between two or more atoms, resulting in a stable arrangement of electrons in the outermost energy level.

Solution:
Correct Option is : (B)
Chemical bonds form through the sharing or transfer of electrons between two or more atoms, resulting in a stable arrangement of electrons in the outermost energy level.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following explains the formation of the H2molecule on the basis of valence bond theory?

Options:
A The valence bond theory suggests that H2forms when two hydrogen atoms share a pair of electrons through the overlap of their 1s atomic orbitals, resulting in the formation of a sigma (σ) bond.
B According to the valence bond theory, H2forms when two hydrogen atoms transfer one electron each to create a strong ionic bond.
C In the valence bond theory, H2is formed when two hydrogen atoms collide and undergo a nuclear reaction, combining their nuclei to form a molecule.
D Valence bond theory does not provide an explanation for the formation of the H2molecule.

The correct answer is:
The valence bond theory suggests that H2forms when two hydrogen atoms share a pair of electrons through the overlap of their 1s atomic orbitals, resulting in the formation of a sigma (σ) bond.

Solution:
Correct Option is : (A)
The valence bond theory suggests that H2forms when two hydrogen atoms share a pair of electrons through the overlap of their 1s atomic orbitals, resulting in the formation of a sigma (σ) bond.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following explains the Lewis structure of CO32–ion in terms of resonance?

Options:
A The CO32–ion has a single, fixed Lewis structure with no resonance.
B The CO32–ion exhibits resonance, with alternating double bonds between each oxygen atom and the carbon atom.
C The CO32–ion has a linear structure with no possibility for resonance.
D The CO32–ion forms a trigonal planar structure with no resonance.

The correct answer is:
The CO32–ion exhibits resonance, with alternating double bonds between each oxygen atom and the carbon atom.

Solution:
Correct Option is : (B)
The CO32–ion exhibits resonance, with alternating double bonds between each oxygen atom and the carbon atom.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following explains the proportion of 3:1 obtained in the F₂ generation?

Options:
A Law of Segregation.
B Law of Independent Assortment.
C Law of Dominance.
D Law of Heredity.

The correct answer is:
Law of Dominance.

Solution:
The Law of Dominance explains the proportion of 3:1 obtained in the F₂ generation.

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following explains the structure of the CO2molecule?

Options:
A The CO2molecule has a linear structure with 2 sigma and 2 pi bonds between the carbon and oxygen atoms.
B The CO2molecule forms a trigonal planar structure with a double bond between the carbon atom and each oxygen atom.
C The CO2molecule has a bent or V-shaped structure with a single bond between the carbon atom and each oxygen atom.
D The CO2molecule exhibits resonance, with alternating single and double bonds between the carbon atom and each oxygen atom.

The correct answer is:
The CO2molecule has a linear structure with 2 sigma and 2 pi bonds between the carbon and oxygen atoms.

Solution:
Correct Option is : (A)
The CO2molecule has a linear structure with 2 sigma and 2 pi bonds between the carbon and oxygen atoms.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following expressions represents the value and unit of Van der Waal's constant 'a'?

Options:
A a=Vn,Lmol-1
B a=PVn,atmL2mol-1
C a=PV2n2,atmL2mol-2
D a=Pn,atmmol-1

The correct answer is:
a=PV2n2,atmL2mol-2

Solution:
a=PV2n2,
Unit: atm L2mol-2

Topic: Chemistry, States of Matter, NEET
Which of the following extra-embryonic membrane plays an important role in the formation of the placenta?

Options:
A Yolk sac
B Amnion
C Chorion
D Allantois

The correct answer is:
Chorion

Solution:
After implantation, chorionic villi (finger-like projections) develop on the trophoblast which is surrounded by the uterine tissue and maternal blood → Interdigitations between the chorionic villi and uterine tissue forms placenta (a structural and functional unit between developing embryo and maternal body).

Topic: Biology, Human Reproduction, NEET
Which of the following facilitates opening of stomatal aperture?

Options:
A Contraction of outer wall of guard cells
B Decrease in turgidity of guard cells
C Radial orientation of cellulose microfibrils in the cell wall of guard cells
D Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

The correct answer is:
Radial orientation of cellulose microfibrils in the cell wall of guard cells

Solution:
Cellulose microfibrils are oriented radially rather than longitudinally which makes easy for the stoma to open. Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells, decrease in turgidity of guard cells, contraction of the outer wall of guard cells affect the mechanism of opening and closing of stomata.

Topic: Biology, Transport in Plants, NEET, NEET 2017
Which of the following factors affect the rate of transpiration?

Options:
A Temperature, wind speed
B Humidity, stomatal density
C Both a and b
D Shape of subsidiary cells

The correct answer is:
Both a and b

Solution:
Rate of transpiration increases with increase in temperature, but at very high-temperature transpiration decreases due to closure of stomata. Light promotes the opening of stomata thus increases transpiration. Increases in humidity increases the opening of stomata but decrease diffusion of water vapors out of stomata. Increase in wind speed increase transpiration but very high wind velocity causes closure of stomata.

Topic: Biology, Transport in Plants, NEET
Which of the following factor/s are favourable for the binding of oxygen with haemoglobin to form oxyhaemoglobin?

A. High pO2, low pCO2
B. High pH, high temperature
C. Less H+ concentration, low temperature
D. Low pH, high temperature

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

The correct answer is:
A and C

Solution:
According to Bohr's effect, the favourable condition for binding of oxygen with haemoglobin to form oxyhaemoglobin are: high pO2, low pCO2 ,less H+ concentration or high pH and low temperature.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?

Options:
A High $\mathrm{pO}_2$ and Lesser $\mathrm{H}^{+}$concentration
B Low $\mathrm{pCO}_2$ and High $\mathrm{H}^{+}$concentration
C Low $\mathrm{pCO}_2$ and High temperature
D High $\mathrm{pO}_2$ and High $\mathrm{pCO}_2$

The correct answer is:
High $\mathrm{pO}_2$ and Lesser $\mathrm{H}^{+}$concentration

Solution:
The correct answer is option (1) as
Conditions favourable for formation of oxyhaemoglobin in alveoli are high $\mathrm{pO}_2$, less $\mathrm{H}^{+}$concentration low $\mathrm{pCO}_2$ and low temperature.
Option (2), (3) and (4) are not correct as they do not favour the formation of oxyhaemoglobin.

Topic: Biology, Breathing and Exchange of Gases, NEET, NEET 2024
Which of the following factors contribute to the reduction of the pulmonary volume?

Options:
A Relaxation of diaphragm
B Relaxation of the intercostal muscles
C Return of sternum to their normal positions
D All of the above

The correct answer is:
All of the above

Solution:
Inspiration occurs when lung pressure is decreased below atmospheric pressure, and that causes the air to move into the lungs. Expiration, on the other hand, occurs when lung pressure is increased above atmospheric pressure, and that pushes the air out of the lungs.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following factors contributes to the increase of the pulmonary volume?

Options:
A Relaxation of the external intercostal muscles
B Relaxation of the internal intercostal muscles
C Contraction of the internal intercostal muscles
D Relaxation of the diaphragm

The correct answer is:
Relaxation of the internal intercostal muscles

Solution:
Inspiration is initiated by the contraction of diaphragm which increases the volume of thoracic chamber in the antero-posterior axis. The contraction of external intercostal muscles and relaxation of the internal intercostal muscles, lifts up the ribs (upwards and outwards) and the sternum causing an increase in the volume of the thoracic chamber in the dorso-ventral axis. The overall increase in the thoracic volume causes a similar increase in pulmonary volume. An increase in pulmonary volume decreases the intra-pulmonary pressure to less than the atmospheric pressure which forces the air from outside to move into the lungs, i.e., inspiration. Relaxation of the diaphragm and the inter-costal muscles returns the diaphragm and sternum to their normal positions and reduce the thoracic volume and thereby the pulmonary volume. This leads to an increase in intra-pulmonary pressure to slightly above the atmospheric pressure causing the expulsion of air from the lungs, i.e., expiration.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following factors helps in the binding of oxygen with haemoglobin?

Options:
A Partial pressure of carbon dioxide
B Hydrogen ion concentration
C Partial pressure of oxygen
D All of the above

The correct answer is:
All of the above

Solution:
Rise in the partial pressure of CO2 and hydrogen ion concentration causes shifting of oxygen dissociation curve towards right. The right shift is also noticed when oxygen concentration is low.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following factors helps in the study of effects on the binding of oxygen with haemoglobin?

Options:
A Partial pressure of carbon dioxide
B Hydrogen ion concentration
C Partial pressure of oxygen
D All of the above

The correct answer is:
All of the above

Solution:
Rise in partial pressure of CO2 and hydrogen ion concentration causes shifting of oxygen dissociation curve towards right.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following factors is not favourable for the formation of oxyhaemoglobin in the alveoli?

Options:
A High pO₂
B Low pCO₂
C High H⁺ concentration
D Low temperature

The correct answer is:
High H⁺ concentration

Solution:
In the alveoli, where there is high pO₂, low pCO₂, lesser H⁺ concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following factors is not responsible for the solubility of alcohols in water?

Options:
A Hydrogen Bonding
B Temperature
C Size of aryl / alkyl group
D None of the above

The correct answer is:
Temperature

Solution:
Correct Option is : (B)
Temperature

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

Options:
A CO2 is more volatile than CS2
B Metal sulphides are thermodynamically more stable than CS2
C CO2 is thermodynamically more stable than CS2
D Metal sulphides are less stable than the corresponding oxides

The correct answer is:
Metal sulphides are thermodynamically more stable than CS2

Solution:
Metal sulphides are more stable than corresponding oxides and that is why they are more difficult to extract metal from sulphide ores. To make the extraction easy and economical , first these sulphides are converted into corresponding oxides and from these oxides metal is easily extracted by reducing them with carbon.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Which of the following factors may result in introduction of new variations?

Options:
A Gene mutation
B Genetic recombination
C Stabilizing natural selection
D Immigration of individuals

The correct answer is:
Gene mutation

Solution:
Mutation - Mutations help the organisms to form new phenotypes. This may lead to speciation over a few generations. Mutations are usually harmful and recessive.

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following factors play a role in primary productivity?

Options:
A Light and temperature
B Water and nutrients
C Photosynthetic capacity of producers
D All of these

The correct answer is:
All of these

Solution:
The primary productivity of an ecosystem is the rate at which biomass or organic matter is produced per unit area per unit time by plants (primary producers). Primary productivity depends upon plant species of the area, their photosynthetic capacity, availability of nutrients, solar radiations, precipitation, soil type and a number of other environmental factors.

Topic: Biology, Ecosystem, NEET