datavorous/entrance-exam-dataset huggingface dataset:
Phytophagous are

Options:
A the insects that feeds on plant sap
B the phagocytosing cells of plants that kills the plant pathogens
C the virus that eats plant cells
D none of these

The correct answer is:
the insects that feeds on plant sap

Solution:
The organisms that feed on plant sap and other parts of plants are termed as phytophagous. For plants, herbivores are the predators. Nearly 25% of all insects are known to be phytophagous (feeding on plant sap and other parts of plants). As plants cannot run away from their predators, they have evolved a variety of morphological and chemical defenses against herbivores. Thorns (Acacia, Cactus) are the most common morphological means of defense. Many plants produce and store chemicals that make the herbivore sick when they are eaten, inhibit feeding or digestion, disrupt its reproduction or even kill it.

Topic: Biology, Organisms and Populations, NEET
Pick out incorrect statement.

Options:
A NF3 molecule has trigonal pyramidal structure
B NF 3 is practically insoluble in water and is only hydrolyzed, when an electric spark is passed through a mixture with water vapour
C Dipole moment of NF3 is more than that of NH3
D Nitrogen (III) oxide (N2O3) is an acidic oxide

The correct answer is:
Dipole moment of NF3 is more than that of NH3

Solution:
Dipole moment of NH3 (0.49 Ã10-29 cm) is more than that of NF3(0.07Ã10-29cm) . This is due to the fact that the direction of the dipole moments of the bonding N-H and non-bonding electron pairs coincide in NH3 and therefore, vector addition of all dipole moments yield a large resultant dipole moment. In NF3 , on the contrary, the dipole moments of N-F bonds and of the non-bonding electron pair are in opposite directions, so that they are partially compensated when summated.
A. From the above figre, it is clear that NF3 has a trigonal pyramidal structure.
B. 2NF3+3H2O(vapour)âN2O3+6HF
D. N 2 O 3 l + H 2 O l → 2 HNO 2 l Acid

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Pick out the correct statement with respect to [Mn(CN)6]3-

Options:
A It is sp3d2 hybridised and tetrahedral
B It is d2sp3 hybridised and octahedral
C It is dsp2 hybridised and square planar
D It is sp3d2 hybridised and octahedral

The correct answer is:
It is d2sp3 hybridised and octahedral

Solution:
As in [Mn(CN)6]3- Coordination number is 6 and CN − being strong ligand paired up inner 3d e- so it is d2sp3 and octahedral complex.

Topic: Chemistry, Coordination Compounds, NEET
Pick out the correct statement with respect to [Mn(CN)6]3-.

Options:
A It is sp3d2 hybridised and octahedral.
B It is sp3d2 hybridised and tetrahedral.
C It is d2sp3 hybridised and octahedral.
D It is dsp2 hybridised and square planar.

The correct answer is:
It is d2sp3 hybridised and octahedral.

Solution:
MnCN63-
MnIII=Ar3d4
CN- being strong field ligand forces pairing of electrons.
This gives t2g4 eg0
∵ The coordination number of Mn=6
∴ Structure=octahedral
MnCN63-=

Topic: Chemistry, Coordination Compounds, NEET, NEET 2017
Pick out the correct statement w.r.t. the flagella found in a particular class of algae.

Options:
A In brown algae motile spores have 2-8, equal, lateral flagella
B In green algae motile cell, have 2 unequal, apical flagella
C In red algae motile cells have 2-8, equal and apical flagella, few are non-motile
D In brown algae motile spores are biflagellate and flagella are unequal and lateral.

The correct answer is:
In brown algae motile spores are biflagellate and flagella are unequal and lateral.

Solution:
In Chlorophyceae (green algae) motile cell has 2 - 8 equal apical flagella. In Rhodophyceae (red algae) flagella are absent. In Phaeophyceae (brown algae) motile spores are biflagellate and flagella are unequal and lateral.

Topic: Biology, Plant Kingdom, NEET
Pick out the correct statements.

1. Haemophilia is a sex-linked recessive disease.
2. Down's syndrome is due to aneuploidy.
3. Phenylketonuria is an autosomal dominant genetic disorder.
4. Thalassemia is an autosomal recessive gene disorder.
5. Sickle cell anaemia is an X-linked recessive gene disorder.

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

The correct answer is:
I , II and IV are correct

Solution:
Haemophilia or Bleeder's disease is a sex-linked (X-linked recessive) disease. Down's syndrome is caused due to trisomy of chromosome 21 (i.e., hyperdiploid type of aneuploidy). Phenylketonuria, Sickle-cell anemia, and Thalassemia is an autosomal recessive gene disorder.

Topic: Biology, Principles of Inheritance and Variation, NEET
Pick out the correct statements:

(i) Colour blindness is a sex-linked recessive gene disorder

(ii) Klinefelter's syndrome is 18th chromosomal trisomy

(iii) Phenylketonuria is an autosomal dominant gene disorder.

(iv) Downâs syndrome is due to aneuploidy

Options:
A i ,ii, and iii are correct
B i and ii are correct
C ii,iii,and iv are correct
D i,ii,and iv are correct

The correct answer is:
i,ii,and iv are correct

Solution:
Colour blindness is usually a genetic condition. Red/green and blue colour blindness is usually passed down from parents to offsprings. The gene which is responsible for the condition is carried on the X chromosome.

Edward syndrome is a genetic disorder caused by the presence of all or part of an extra 18th chromosome. The majority of people with the syndrome die during the fetal stage; infants who survive experience serious defects and commonly live for short periods of time

Aneuploidy is the presence of an abnormal number of chromosomes in a cell, for example, a human cell having 45 or 47 chromosomes instead of the usual 46. Downâs syndrome is due to aneuploidy with 47 chromosomes.

Phenylketonuria is an autosomal recessive gene disorder.

Topic: Biology, Principles of Inheritance and Variation, NEET
Pick out the correct statements:

(i) Haemophilia is a sex-linked recessive disease.
(ii) Down's syndrome is due to aneuploidy.
(iii) Phenylketonuria is an autosomal recessive gene disorder.
(iv) Sickle cell anaemia is an X-linked recessive gene disorder.

Options:
A (i) and (iv) are correct
B (ii) and (iv) are correct
C (i), (iii) and (iv) are correct
D (i), (ii) and (iii) are correct

The correct answer is:
(i), (ii) and (iii) are correct

Solution:
Haemophilia is a sex-linked recessive disease in which there is a problem in clotting of blood.
Down's syndrome (trisomy 21) is caused due to aneuploidy.
Phenylketonuria is an autosomal recessive gene disorder.
Sickle cell anaemia is autosomal recessive gene disorder.

Topic: Biology, Principles of Inheritance and Variation, NEET, NEET 2016 (Phase 1)
Pick out the correct statements:

(i) Haemophilia is a sex-linked recessive disease.
(ii) Down's syndrome is due to aneuploidy.
(iii) Phenylketonuria is an autosomal recessive gene disorder.
(iv) Sickle cell anaemia is an X-linked recessive gene disorder.

Options:
A (i) and (iv) are correct
B (ii) and (iv) are correct
C (i), (iii) and (iv) are correct
D (i), (ii) and (iii) are correct

The correct answer is:
(i), (ii) and (iii) are correct

Solution:
Haemophilia is a sex-linked recessive disease in which there is a problem in clotting of blood.
Down's syndrome (trisomy 21) is caused due to aneuploidy.
Phenylketonuria is an autosomal recessive gene disorder.
Sickle cell anaemia is autosomal recessive gene disorder.

Topic: Biology, Principles of Inheritance and Variation, NEET
Pick out the incorrect statement.

Options:
A Except nitrogen, all the elements of group 15 exist in allotropic modification
B Only at high temperatures, greater than 1,070 K, phosphorus vapours dissociates into P2 molecules
C Red phosphorus is obtained by heating white phosphorus at 540-570 K in the absence of air for several hours
D White phosphorus is more reactive, but less soluble in CS2 (and other organic solvents) than red phosphorus

The correct answer is:
White phosphorus is more reactive, but less soluble in CS2 (and other organic solvents) than red phosphorus

Solution:
White phosphorus is readily soluble in CS2 and other organic solvent, but red phosphorus is insoluble in these.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Pick out the incorrect statement

Options:
A In ferromagnetic material, all the magnetic moments are aligned in the same direction
B In anti-ferromagnetic material, magnetic moments are aligned in parallel and anti-parallel directions in equal numbers
C In ferrimagnetism, magnetic moments are aligned in parallel and anti-parallel direction in unequal numbers
D paramagnetism of a substance increases at elevated temperature

The correct answer is:
paramagnetism of a substance increases at elevated temperature

Solution:
The dipole alignment gets interrupted at elevated temperatures due to random motion of molecules. Hence paramagnetism decreases

Topic: Chemistry, Solid State, NEET
Pick out the incorrect statement about ATP.

Options:
A It is a nucelotide
B It contains the purine, adenine
C The enzyme-catalysed hydrolysis ATP to ADP and AMP is accompained by absorption of energy
D Energy is stored in the cell in form of ATP

The correct answer is:
The enzyme-catalysed hydrolysis ATP to ADP and AMP is accompained by absorption of energy

Solution:
Here statement in option C is incorrect while rest are correct as
ATP→ADP→AMP sequence of reactions is accompained by the evolution of energy.

Topic: Chemistry, Biomolecules, NEET
Pick out the incorrect statement about CO.

Options:
A In laboratory it is prepared by dehydrating HCOOH with conc. H2SO4
B CO is neutral oxide and acts as a fuel
C It reduces aqueous solution of PdCl2 to metallic Pd
D CO forms complex with haemoglobin and this complex is less stable than oxyhaemoglobin

The correct answer is:
CO forms complex with haemoglobin and this complex is less stable than oxyhaemoglobin

Solution:
Here option D is incorrect statement as the complex formed by CO with haemoglobin is more stable than oxyhaemoglobin. Rest other are correct.
HCOOH→H2SO4-H2OCO
2CO+O2→2CO2;ΔH°=-565 kJ mol-1
CO+PdCl2+H2O→Pd+CO2+2HCl

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Pick out the incorrect statement about glycolysis

Options:
A It is anaerobic respiration
B During glycolysis glucose is converted into pyruvate or lactate with generation of 38 molecules of ATP per molecule of glucose
C Glycolysis provides energy to those cells which live without oxygen
D It occurs in the cytoplasm of the cell

The correct answer is:
During glycolysis glucose is converted into pyruvate or lactate with generation of 38 molecules of ATP per molecule of glucose

Solution:
Here statement B is incorrect as glycolysis is accompanied by the generation of 2 ATP molecules per molecule of glucose. Rest all other statements are correct regarding glycolysis.

Topic: Chemistry, Biomolecules, NEET
Pick out the incorrect statement for HI.

Options:
A It reduces H2SO4 to SO2
B It reduces iodic acid to I2
C It does not decolourise acidified KMnO4
D It liberates I2 with CuSO4 solution

The correct answer is:
It does not decolourise acidified KMnO4

Solution:
It reduces and hence, decolourises acidified KMnO4 solution.
2KMnO4+3H2SO4+10HI→K2SO4+2MnSO4+8H2O+5I2
A. H2SO4+2HI→SO2+I2+2H2O
B. HIO3+5HI→3I2+3H2O
D. 2CuSO4+4HI→2CuI2+2H2SO4
2CuI2→Cu2I2+I2

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Pick out the incorrect statement for SO2 .

Options:
A It turns filter paper moistened with acidified K2Cr2O7 solution green
B It turns starch iodate paper blue
C It does not react with chlorine in presence of charcoal
D It decolourieses acidified KMnO4 solution

The correct answer is:
It does not react with chlorine in presence of charcoal

Solution:
It react with Cl2 in presence of charcoal (acting as a catalyst).
SO2+Cl2→CharcoalSO2Cl2
A. K2Cr2O7+3SO2+H2SO4→Cr2(SO4)3(Green)+K2SO4+H2O
B. 2KIO3+5SO2+4H2O→I2+2KHSO4+3H2SO4
I2 so formed reacts with starch to form a complex of blue colour.
D. 2KMnO4+5SO2+2H2O→K2SO4+2MnSO4(Colourless)+2H2SO4

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Pick out the incorrect statement for transition metals

Options:
A They have low melting and boiling points (or low enthalpies of atomization)
B 5d-elements have higher ionization energies than 3d or 4d-elements
C Zr and Hf have almost identical atomic and ionic radii
D They form interstitial compounds

The correct answer is:
They have low melting and boiling points (or low enthalpies of atomization)

Solution:
Transition metals have high enthalpies of atomization, because they form strong metallic bonds, due to participation of (n – 1) d-electrons along with ns-electrons in metallic bonding.
This due to the greater effective nuclear charge acting on outer valence electrons, because of weak shielding of nucleus by 4f-electrons
The normal size increase from Zr to Hf is almost exactly balanced by lanthanide contraction
Because of small size, atoms of H, He, C, N occupy the vacant spaces in the crystal lattice of transition metal.

Topic: Chemistry, d and f Block Elements, NEET
Pick out the incorrect statement for XeF4

Options:
A XeF4 disproportionates violently with water
B It is used as fluorinating agent
C It has octahedral shape
D It oxidizes I- or I2

The correct answer is:
It has octahedral shape

Solution:
According to VSEPR theory, six electron pairs form an octahedron with two positions occupied by lone pairs. This results in square planar shape of XeF4 .
A. 3XeF4(+4)+6H2O→2Xe(0)+XeO3(+6)+12HF+32O2
XeF4 is reduced to Xe and also oxidized to XeO3 .
B. (i) XeF4+2SF4→Xe+2SF6
(ii) 3XeF4+2Pt→3Xe+2PtF6
(iii) XeF4+C6H6→Xe+C6H5F+HF
D. XeF4+4KI→4KF+Xe+2I2

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Pick out the incorrect statement regarding H2O2 .

Options:
A H2O2 is kept in waxlined bottle
B H2O2 acts both as oxidizing and reducing agent
C It is not possible to determine its boiling point at atmospheric pressure
D H2O2 does not react with acidified KMnO4

The correct answer is:
H2O2 does not react with acidified KMnO4

Solution:
Here statement D is wrong as H2O2 is oxidized to O2 by acidified KMnO4 .
2MnO4-+5H2O2+6H+→2Mn2++8H2O+5O2
A. It is because rough surface catalyze decomposition of H2O2 .
B. Oxidation state of oxygen in H2O2 is -1. It can, therefore, be oxidized to O2 (zero oxidation state) or reduced to H2O or OH- (-2 oxidation state).
C. It decomposes vigorously above 413 K. Its boiling point (423.2 K) is an extrapolated value.

Topic: Chemistry, s Block Elements, NEET
Pick out the statement which is not true?

Options:
A Tetrazine is harmful edible colour
B Alitame is an artificial sweetner
C BHT is an antioxidant
D Sodium alkyl sulphate is a cationic detergent

The correct answer is:
Sodium alkyl sulphate is a cationic detergent

Solution:
Sodium alkyl sulphate is not a cationic detergent but it is an anionic detergent as it gives anion which acts as surfactant.
RCH 2 − SO 3 Na Sodium alkylsulphate → RCH 2 SO 3 − Anionicpart + Na +

Topic: Chemistry, Chemistry in Everyday Life, NEET
Pick up the CORRECT statement from the following:

a. The spindle formation is anastral in plant cell while amphiastral in an animal cell.
b. DNA replicates once in mitosis and twice in meiosis.
c. Equational division, as well as reduction division, occurs in both, sexually and asexually reproducing organisms.

Options:
A a only
B b only
C a and b only
D a and c only

The correct answer is:
a only

Solution:
The DNA replication takes place only once during the S phase of mitosis. The equational division also known as mitosis takes place in organisms having both modes of reproduction, asexual as well as sexual, both meiosis or reductional division involves the fusion of gametes and reduction of the chromosome by half, found only in sexual reproduction. In plant cells, the spindle formation is anastral (without asters) and in animal cells spindle has two asters, one at each pole of the spindle.

Topic: Biology, Cell Cycle and Cell Division, NEET
Pick up the wrong statement.

Options:
A Protista have photosynthetic and heterotrophic modes of nutrition
B Some fungi are edible
C Nuclear membrane is present in Monera
D Cell wall is absent in Animalia

The correct answer is:
Nuclear membrane is present in Monera

Solution:
The members of kingdom-Monera are prokaryotes. True nucleus is absent in a prokaryotic cell. Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double stranded DNA located in an area of the cell called the nucleoid.

Euglena perform photosynthesis in the presence of light, while they show heterotrophic nutrition in the absence of light. Mushrooms are edible fungus. Animals do not have any cell wall.

Topic: Biology, Biological Classification, NEET, NEET 2015 (Phase 2)
Pickles have a long shelf life and do not get spoiled for months, why?

Options:
A Pickles have plenty of salt and cover of oil which act as preservative. These do not allow bacteria to thrive on them.
B Pickles have a high sugar content, which acts as a natural preservative.
C Pickles are vacuum-sealed to prevent the entry of air and microorganisms.
D Pickles are stored at extremely low temperatures to extend their shelf life.

The correct answer is:
Pickles have plenty of salt and cover of oil which act as preservative. These do not allow bacteria to thrive on them.

Solution:
Correct Option is : (A)
Pickles have plenty of salt and cover of oil which act as preservative. These do not allow bacteria to thrive on them.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Pigment-containing memberanous extensions in some cyanobacteria are

Options:
A heterocysts
B basal bodies
C pneumatophores
D chromatophores

The correct answer is:
chromatophores

Solution:
Cyanobacteria contain chlorophyll but the chlorophyll is not located in chloroplasts, rather it is found in chromatophores, infolding of the plasma membrane, where photosynthesis is carried out. Heterocysts are specialised nitrogen fixing cells formed by some filamentous cyanobacteria such as Nostoc. A basal body is an organelle formed from a centriole and a short cylindrical array of microtubules. Pneumatophores are lateral roots that grow upward for varying distance and function as the site of oxygen intake for the submerged primary roots.

Topic: Biology, Biological Classification, NEET, NEET 2013 (All India)
Pila and Octopus belongs to which one of the given phylum ?

Options:
A Mollusca
B Arthropoda
C Annelida
D Porifera

The correct answer is:
Mollusca

Solution:
Given diagrams represent phylum Mollusca.

Topic: Biology, Animal Kingdom, NEET
Pinctada is commonly called as

Options:
A Pearl oyster
B Sea hare
C Chiton
D Salpa

The correct answer is:
Pearl oyster

Solution:
Pinctada is commonly called pearl oysters and these are molluscs. These oysters have a strong inner shell layer composed of nacre, also known as "mother of pearl". Molluscs are terrestrial or aquatic (marine or freshwater) having an organ-system level of organization. They are bilaterally symmetrical, triploblastic and coelomate animals. The body is covered by a calcareous shell and is unsegmented with a distinct head, muscular foot and visceral hump.

Topic: Biology, Animal Kingdom, NEET
Pineapple (ananas) fruit develops from:

Options:
A a multilocular monocarpellary flower
B a unilocular polycarpellary flower
C a multipistillate syncarpous flower
D a cluster of compactly borne flowers on a common axis

The correct answer is:
a cluster of compactly borne flowers on a common axis

Solution:
The fruit of Ananas comosus (pineapple or ananas) is sorosis, (a type of multiple fruits), developing from spike, spadix or catkin. In this type, the flowers associate by their succulent petals, the axis bearing them grows and becomes fleshy or woody, thus, the whole inflorescence turns into a compact fruit. Here, the whole inflorescence turns into a compact fruit.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET, NEET 2006
Pineapple fruit develops from:

Options:
A Unilocular polycarpellary flower
B Multipistillate syncarpous flower
C Multilocular monocarpellary flower
D A cluster of compactly borne flowers on an axis

The correct answer is:
A cluster of compactly borne flowers on an axis

Solution:
When the entrie inflorescence develops to form a single fruit than it is known as multiple or composite fruit. In pineapple the fruit develops from an inflorescence having cluster of compactly borne flower on an axis.

Topic: Biology, Morphology of Flowering Plants, NEET
Pineapple fruit develops from

Options:
A a multilocular,monocarpellary flower
B a unilocular, polycarpellary flower
C a multipistillate syncarpous flower
D a cluster of compactly borne flowers on a common axis

The correct answer is:
a cluster of compactly borne flowers on a common axis

Solution:
Pineapple is a sorosis type of fruit that develops from spike inflorescence. Here the flowers fuse by their succulent tepals and axis bearing the flowers becomes fleshy or woody, thus forming a compact mass. These are composite or multiple fruits.

Topic: Biology, Morphology of Flowering Plants, NEET
Pinnately compound leaf is found in

Options:
A Silk cotton
B Alstonia
C Neem
D Mangifera indica

The correct answer is:
Neem

Solution:
In a pinnately compound leaf, a number of leaflets are present on a common axis, the rachis, which represents the midrib of the leaf as in neem.

Topic: Biology, Morphology of Flowering Plants, NEET
Pinus seed cannot germinate and establish without fungal association. This is because:

Options:
A Its embryo is immature
B It has obligate association with mycorrhizae
C It has very hard seed coat
D Its seeds contain inhibitors that prevent germination

The correct answer is:
It has obligate association with mycorrhizae

Solution:
Mycorrhiza is a symbiotic association of a fungus with a root system. Pinus cannot germinate without a fungal partner. It has an obligate and mutualistic association with mycorrhizae.

Topic: Biology, Plant Kingdom, NEET, NEET 2019 (All India)
Pith and cortex do not differentiate in

Options:
A monocot stem
B dicot stem
C monocot root
D dicot root

The correct answer is:
monocot stem

Solution:
In a monocot stem, the pith and cortex do not get bifurcated. Vascular bundles are many in number and are scattered. The ground meristem comprises of only hypodermis and ground parenchyma.

Topic: Biology, Anatomy of Flowering Plants, NEET
Pith is absent in

Options:
A Dicot stem
B Dicot root
C Monocot stem
D Monocot root

The correct answer is:
Monocot stem

Solution:
In Monocot stem ground tissue is undifferentiated, it consists of cortex in which vascular bundles are scattered, thus pith is absent. Distinct pith is present in Dicot stem, Dicot root and monocot root, though pith of dicot root is small as compared to monocot root.

Topic: Biology, Anatomy of Flowering Plants, NEET
pK a of a weak acid HA and pK b of a weak base BOH are 3.2 and 3.4 respectively. The pH of their salt AB solution at 25 o C is

Options:
A 6.9
B 7.0
C 1.0
D 7.2

The correct answer is:
6.9

Solution:
Hydrolysis of salt of weak acid and weak base
pH= 1 2 pK w + pK a â pK b
=1214+3.2-3.4
=6.9

Topic: Chemistry, Ionic Equilibrium, NEET
Place the following alcohols in decreasing order of rate of dehydration with concentration H2SO4 .
1.CH3CH2CH(OH)CH2CH2CH3
2. (CH3)2C(OH)CH2CH2CH3
3. (CH3)2C(OH)CH(CH3)2
4. CH3CH2CH(OH)CH(CH3)2
5. CH3CH2CH2CH2CH2CH2OH

Options:
A 3 > 2 > 4 > 5 > 1
B 3 > 2 > 4 > 1 > 5
C 3 > 2 > 1 > 4 > 5
D 3 > 2 > 1 > 5 > 4

The correct answer is:
3 > 2 > 4 > 1 > 5

Solution:
The alcohols (3) and (2) are both 3° , but alcohol (3) gives a more substituted alkene. Alcohol (4) and (1) are both 2° , but alcohol (4) can give a more substituted alkene and alcohol (5) is 1° . Rate of dehydration of alcohols with concentration H2SO4 follows the order 3>2>4>1>5

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Placenta and pericarp are both edible portions in:

Options:
A Apple
B Banana
C Tomato
D Potato

The correct answer is:
Tomato

Solution:
Tomato is a berry fruit in which all the parts of fruit including placenta and pericarp are edible.

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2014