datavorous/entrance-exam-dataset huggingface dataset:
The major product [P] formed in the following reaction is

Options:
A
B
C
D

The correct answer is:

Solution:

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
The major product (P) in the following reaction
P is

Options:
A
B
C
D

The correct answer is:

Solution:
In presence of strong electron withdrawing group like NO2 at ortho and para position nucleophilic substitution is possible as follows

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
The major product $X$ formed in the following reaction sequence is:

Options:
A

B

C

D

The correct answer is:

Solution:

Topic: Chemistry, Hydrocarbons, NEET, NEET 2024 (Re-NEET)
The major product 'Y' in the following reaction is

Options:
A
B
C
D

The correct answer is:

Solution:

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
The major product (Y) in the following reactions is

Options:
A
B
C
D

The correct answer is:

Solution:
Here reaction sequence is as follows and Y is 2,3-dimethyl-pent-2-ene.

Topic: Chemistry, Hydrocarbons, NEET
The major product Z obtained in the following reaction scheme is

Options:
A
B
C
D

The correct answer is:

Solution:
The reaction sequence is as follows

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
The major products $C$ and $D$ formed in the following reactions respectively are $\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{OC}\left(\mathrm{CH}_3\right)_3 \stackrel{\text { Excess HII }}{\longrightarrow} \mathrm{C}+\mathrm{D}$

Options:
A $\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-$ and $\mathrm{L}-\mathrm{C}\left(\mathrm{CH}_3\right)_3$
B $\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{OH}$ and $\mathrm{I}-\mathrm{C}\left(\mathrm{CH}_3\right)_3$
C $\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{l}$ and $\mathrm{HO}-\mathrm{C}^2\left(\mathrm{CH}_3\right)_3$
D $\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{OH}$ and $\mathrm{HO}-\mathrm{C}\left(\mathrm{CH}_3\right)_3$

The correct answer is:
$\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-$ and $\mathrm{L}-\mathrm{C}\left(\mathrm{CH}_3\right)_3$

Solution:
Ethers are readily cleaved by heating in presence of halogen acids to form alcohol and an alkyl halide. In case of unsymmetrical ethers, halogen goes preferentially with smaller alkyl group or more stable carbocation.
If excess of acid is used then only alkyl halide is formed because alcohol formed reacts further with halogen acid to form corresponding alkyl halide.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET, NEET 2019 (Odisha)
The major products obtained in the following reaction is/are

Options:
A
B
C
D

The correct answer is:

Solution:
Br2 addition is anti-addition.
Now remember 'CAR' and 'TAM' rule.
C → Cis T → Trans
A → Anti A → Anti
R → Racemic M → Meso

Topic: Chemistry, Hydrocarbons, NEET
The major relay station for sensory input that projects to the cerebral cortex is the

Options:
A pons
B thalamus
C cerebellum
D hypothalamus

The correct answer is:
thalamus

Solution:
The brain is divided into forebrain, midbrain, and hindbrain. The forebrain consists of cerebrum and diencephalon. Diencephalon encloses the third ventricle. It is made up of lateral walls known as the thalamus, the floor which is known as the hypothalamus and the roof is epithalamus. Thalamus acts as a relay center. It connects the cerebellum with the cerebrum. Hypothalamus forms a stalk to which pituitary gland is attached. Epithalamus forms a stalk to which pineal gland is attached.

Topic: Biology, Neural Control and Coordination, NEET
The major reservoir of carbon on earth is ___.

Options:
A river
B canal
C sea
D sky

The correct answer is:
sea

Solution:
The major reservoir of carbon on earth is sea

Topic: Biology, Ecosystem, NEET
The major role of minor elements inside living organisms is to act as:

Options:
A co-factors of enzymes
B building blocks of important amino acids
C constituent of hormones
D binder of cell structure

The correct answer is:
co-factors of enzymes

Solution:
Trace elements function primarily as catalysts in enzyme systems; some metallic ions, such as iron and copper, participate in oxidationreduction reactions in energy metabolism. Iron, as a constituent of haemoglobin and myoglobin, also plays a vital role in the transport of oxygen.
Related Theory
Essential trace elements of the human body include zinc ( $\mathrm{Z} n)$, copper (Cu), selenium (Se), chromium (Cr), cobalt (Co). lodine (I). manganese (Mn), and molybdenum (Mo).

Topic: Biology, Biomolecules (B), NEET, NEET 2003
The majority of Baculoviruses are used as biological control agents because

Options:
A they attack insects and other arthropods.
B they have been shown to have no negative impact on non-target plants and animals.
C these viruses are excellent candidates for genus-specific activity.
D More than one option is correct

The correct answer is:
More than one option is correct

Solution:
Baculoviruses are pathogens that attack insects and other arthropods. The majority of baculoviruses used as biological control agents are in the genus Nucleopolyhedrovirus. These viruses are excellent candidates for species-specific, narrow spectrum insecticidal applications. They have been shown to have no negative impacts on plants, mammals, birds, fish or even on non-target insects.

Topic: Biology, Microbes in Human Welfare, NEET
The majority of carbon dioxide produced by our body cells is transported to the lungs:

Options:
A attached to haemoglobin
B dissolved in the blood
C as bicarbonates
D as carbonates

The correct answer is:
as bicarbonates

Solution:
Carbon dioxide molecules are transported in the blood from body tissues to the lungs by one of three methods: dissolution directly into the blood, binding to haemoglobin, or carried as a bicarbonate ion. About 5 to 7 percent of all carbon dioxide is dissolved in the plasma. About 10 percent of carbon dioxide can bind to plasma proteins or can enter red blood cells and bi nd to hemoglobin to form carbaminohemoglobin. The majority of carbon dioxide molecules ( 85 percent) are carried as part of the bicarbonate buffer system. In this system, carbon dioxide diffuses into the red blood cells.
Related Theory
Carbonic anhydrase within the red blood cells converts the carbon dioxide into carbonic acid $\left(\mathrm{H}_2 \mathrm{CO}_3\right)$. Carbonic acid is an unstable intermediate molecule that immediately dissociates into bicarbonate ions $\left(\mathrm{HCO}_3^{-}\right)$ and hydrogen $\left(\mathrm{H}^{+}\right)$ions. Since carbon dioxide is quickly converted into bicarbonate ions, this reaction allows for the continued uptake of carbon dioxide into the blood down its concentration gradient.

Topic: Biology, Breathing and Exchange of Gases, NEET, NEET 2006
The malarial parasite can best be obtained from a patient

Options:
A An hour before rise of temperature
B When temperature rises with rigor
C When temperature comes to normal
D Five hours after the temperature reaches to normal

The correct answer is:
When temperature rises with rigor

Solution:
The signet ring structured trophozoite acquires brownish-black Haemozoin granules and this causes chill and body pain with increasing temperature. When RBC's gets ruptured, the malarial parasites can be obtained in a large number in blood as merozoites and the temperature rises with rigor.

Topic: Biology, Human Health and Diseases, NEET
The malarial parasites initially multiply within the liver cells and then attack the red blood cells (RBCs) resulting in their rupture. The rupture of RBCs is associated with release of

Options:
A A toxic substance, hypnotoxin, (responsible for chill and high fever) recurring every 6-7 days.
B A toxic substance, hypnotoxin, (responsible for chill and high fever) recurring every 3-4 days.
C A toxic substance, hemozoin, (responsible for chill and high fever) recurring every 6-7 days.
D A toxic substance, hemozoin, (responsible for chill and high fever) recurring every 3-4 days.

The correct answer is:
A toxic substance, hemozoin, (responsible for chill and high fever) recurring every 3-4 days.

Solution:
The life cycle of Plasmodium - It requires two hosts to complete its life cycle - Human (host) and female Anopheles mosquito (vector).
A. Female Anopheles mosquito bites the human and releases sporozoites in the blood.
B. Multiplication of parasites in the liver cells.
C. The entry of parasite into RBCs → Rupture of RBCs → Release of a toxic substance → Hemozoin → Hemozoin causes chills and high fever repeating every 3 to 4 days.
D. Female Anopheles mosquito bites an infected person → Parasites enter the mosquito's body (gut) and undergo further development.
E. Multiplication of parasites within the body of mosquito to form sporozoites → Sporozoites are stored in the salivary glands.
F. Step A - E repeated.

Topic: Biology, Human Health and Diseases, NEET
The manganate and permanganate ions are tetrahedral, due to:

Options:
A The π -bonding involves overlap of p -orbitals of oxygen with d -orbitals of manganese
B There is no π -bonding
C The π -bonding involves overlap of p -orbitals of oxygen with p -orbitals of manganese
D The π -bonding involves overlap of d -orbitals of oxygen with d -orbitals of manganese

The correct answer is:
The π -bonding involves overlap of p -orbitals of oxygen with d -orbitals of manganese

Solution:
The manganate and permanganate ions are tetrahedral due to the π- bonding involves overlap of p- orbitals of oxygen with d- orbitals of manganate.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2019 (All India)
The mango has a fleshy, edible ____________ and a stony hard _____________.

Options:
A endocarp; epicarp
B mesocarp; endocarp
C pericarp; epicarp
D pericarp; endocarp

The correct answer is:
mesocarp; endocarp

Solution:
In mango and coconut, the fruit is known as a drupe. They develop from monocarpellary superior ovaries and are one-seeded. In mango, the pericarp is well-differentiated into an outer thin epicarp, a middle fleshy edible mesocarp and an inner stony hard endocarp. In coconut which is also a drupe, the mesocarp is fibrous.

Topic: Biology, Morphology of Flowering Plants, NEET
The map distance between genes A and B is 3 units, between B and C is 10 units and between C and A is 7 units. Which of the following shows the correct order of the genes in a linkage map on the above data?

Options:
A A, B, C
B A, C, B
C B, C, A
D C, A, B

The correct answer is:
C, A, B

Solution:
The distance between gene B and gene C is 10 whereas between C and A is 7. From the info, the graphic representation would be

Topic: Biology, Principles of Inheritance and Variation, NEET
The Markownikoff's rule is best applicable to the reaction:

Options:
A C 2 H 4  + HCl
B C 3 H 6  +  Br 2
C C 3 H 6  + HBr
D C 3 H 8  +  Cl 2

The correct answer is:
C 3 H 6  + HBr

Solution:
The Markownikoff's rule is best applicable to the reaction C 3 H 6  + HBr i.e. unsymmetrical alkene with HBr. This rule is used as a guidance for electrophilic addition in those cases where an asymmetrical reagent is added to an asymmetrical alkene, where the negative part of reagent attaches itself to that carbon atom that contains lesser number of hydrogen atoms.
In options (B) and (D), reagent used is Br 2 and Cl 2 that gives addition reaction via free radial substitution. In option (A), alkene used is symmetrical. Hence, Markownikoff's rule is not applicable there.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
The mass and diameter of a planet have twice the value of the corresponding parameters of earth. Acceleration due to gravity on the surface of the planet is

Options:
A 9.8 m s-2
B 4.9 m s-2
C 980 m s-2
D 19.6 m s-2

The correct answer is:
4.9 m s-2

Solution:
g′g=M′MRR′2
g′g=2MMR2R2=12
⇒ g′=g2=9.82=4.9 m s-2

Topic: Physics, Gravitation, NEET
The mass number of a nucleus is:

Options:
A always less than its atomic number
B always more then its atomic number
C sometimes equal to its atomic number
D sometimes less than and sometimes more than its atomic number

The correct answer is:
sometimes equal to its atomic number

Solution:
A $\geq$ Z [Equality sign $\rightarrow$ hydrogen nuclear]

Topic: Physics, Nuclear Physics, NEET, NEET 2003
The mass number of atom whose nucleus has a radius of 5.6 Fermi (R0=1.40×1023 cm) is

Options:
A 61
B 37
C 27
D 64

The correct answer is:
64

Solution:
R= R 0 A 1 3
R = Radius of nucleus
R = 5.6 Fermi = 5.6×10-13 cm
A13=RR0=5.6×10-131.4×10-13=4
So A = 64.

Topic: Chemistry, Structure of Atom, NEET
The mass of a 37Li nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy per nucleon of 37Li nucleus is nearly

Options:
A 46 MeV
B 5.6 MeV
C 3.9 MeV
D 23 MeV

The correct answer is:
5.6 MeV

Solution:
For 37Li nucleus,
Mass defect, ΔM=0.042 u
âµ 1 u= 931.5 MeV c-2
∴ Δ M = 0.042×931.5 MeV c-2
=39.1 MeV c-2
Binding energy, Eb=ΔMc2
= 3 9 · 1 MeV c 2 c 2
=39.1 MeV
Binding energy per nucleon,⁡E⁡bn=E⁡bA⁡=39·1 MeV7
≈5·6 MeV

Topic: Physics, Nuclear Physics, NEET
The mass of a ${ }_3 \mathrm{Li}^7$ nucleus is $0.042 \mathrm{u}$ less than the sum of the masses of all its nucleons. The binding energy per nucleon of ${ }_3 \mathrm{Li}^7$ nucleus is nearly

Options:
A $46 \mathrm{MeV}$
B $5.6 \mathrm{MeV}$
C $3.9 \mathrm{MeV}$
D $23 \mathrm{MeV}$

The correct answer is:
$5.6 \mathrm{MeV}$

Solution:
If $\mathrm{m}=1 \mathrm{u}, \mathrm{c}=3 \times 10^8 \mathrm{~ms}^{-1}$, then $\mathrm{E}=931 \mathrm{MeV}$ ie, $1 \mathrm{u}=931 \mathrm{MeV}$ Binding energy $=0.042 \times 931=39.10 \mathrm{MeV}$ $\therefore$ Binding energy per nucleon
$$
=\frac{39.10}{7}=5.58 \approx 5.6 \mathrm{MeV}
$$

Topic: Physics, Nuclear Physics, NEET, NEET 2010 (Screening)
The mass of a lift is $2000 \mathrm{~kg}$. When the tension in the supporting cable is $28000 \mathrm{~N}$, then its acceleration is

Options:
A $30 \mathrm{~ms}^{-2}$ downwards
B $4 \mathrm{~ms}^{-2}$ upwards
C $4 \mathrm{~ms}^{-2}$ downwards
D $14 \mathrm{~ms}^{-2}$ upwards

The correct answer is:
$4 \mathrm{~ms}^{-2}$ upwards

Solution:
Key Idea Apparent weight $>$ actual weight, then the lift is accelerating upward.
Here, lift is accelerating upward at the rate of $a$ Hence, equation of motion is written as
$$
\begin{gathered}
\mathrm{R}-\mathrm{mg}=\mathrm{ma} \\
28000-20000=2000 \mathrm{a} \\
\Rightarrow \mathrm{a}=\frac{8000}{2000}=4 \mathrm{~ms}^{-2} \text { upwards }
\end{gathered}
$$

Topic: Physics, Laws of Motion, NEET, NEET 2009 (Screening)
The mass of a planet is $\frac{1}{10}$ th that of the earth and its diameter is half that of the earth. The acceleration due to gravity on that planet is:

Options:
A $9.8 \mathrm{~m} \mathrm{~s}^{-2}$
B $4.9 \mathrm{~m} \mathrm{~s}^{-2}$
C $3.92 \mathrm{~m} \mathrm{~s}^{-2}$
D $19.6 \mathrm{~m} \mathrm{~s}^{-2}$

The correct answer is:
$3.92 \mathrm{~m} \mathrm{~s}^{-2}$

Solution:
$\begin{aligned} g^{\prime}=\frac{G M^{\prime}}{R^2} & =\frac{G M}{10\left(\frac{R}{2}\right)^2} \\ & =\frac{4}{10} \frac{G M}{R^2}=0.4 \times 9.8 \\ & =3.92 \mathrm{~m} \mathrm{~s}^{-2}\end{aligned}$

Topic: Physics, Gravitation, NEET, NEET 2024
The mass of a unit cell of CsCl corresponds to the combined masses of:

Options:
A 8Cs+ and 1Cl-
B 1Cs+ and 6Cl-
C 1Cs+ and 1Cl-
D 4Cs+ and 4Cl-

The correct answer is:
1Cs+ and 1Cl-

Solution:
CsCl packed in Simple cubic unit cell ;
Cs present at corner No. of Cs+ in a unit cell = 1 ;
Cl present at body center void No. of Cl- in a unit cell = 1

Topic: Chemistry, Solid State, NEET
The mass of an electron is 9.1 × 10–31kg. If its K.E. is 3.0 × 10–25J, what is its wavelength?

Options:
A 8967Å
B 5674Å
C 6892Å
D 9124Å

The correct answer is:
8967Å

Solution:
Correct Option is : (A)
8967Å

Topic: Chemistry, Structure of Atom, NEET
The mass of an electron is 9.1×10–31kg. If its K.E. is 3.0×10–25J, What is its wavelength?

Options:
A 685.4 nm
B 896.7 nm
C 952.6 nm
D 741.5 nm

The correct answer is:
896.7 nm

Solution:
Correct Option is : (B)
896.7 nm

Topic: Chemistry, Structure of Atom, NEET
The mass of carbon anode consumed (giving only carbon dioxide) in the production of $270 \mathrm{~kg}$ of a aluminium metal from bauxite by the Hall process is:
(Atomic mass : A1 = 27)

Options:
A $270 \mathrm{~kg}$
B $540 \mathrm{~kg}$
C $90 \mathrm{~kg}$
D $180 \mathrm{~kg}$

The correct answer is:
$90 \mathrm{~kg}$

Solution:
$3 \mathrm{C}+2 \mathrm{Al}_2 \mathrm{O}_3 \longrightarrow 4 \mathrm{Al}+3 \mathrm{CO}_2$
(from bauxite)
4 moles of $\mathrm{Al}$ is produced by 3 moles of $\mathrm{C}$
1 mole of $\mathrm{Al}$ is produced by $\frac{3}{4}$ mole of $\mathrm{C}$
$10^4$ moles of $\mathrm{Al}$ is produced by $\frac{3}{4} \times 10^4$ moles of $\mathrm{C}$
Amount of carbon used
$\begin{aligned}
& =\frac{3}{4} \times 10^4 \times 12 \mathrm{~g} \\
& =90000 \mathrm{~g}=90 \mathrm{~kg}
\end{aligned}$

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET, NEET 2005
The mass of living material at a trophic level at a particular time is called:

Options:
A Gross primary productivity
B Standing state
C Net primary productivity
D Standing crop

The correct answer is:
Standing crop

Solution:
Standing crop represents the total amount or number of living things or of one kind of living thing (such as an uncut farm crop, the fish in a pond, or organisms in an ecosystem) in a particular area at any given time. For example, in a population of deciduous tree between summer and winter.

Topic: Biology, Ecosystem, NEET, NEET 2015 (Phase 1)
The mass of man when standing on the lift is 60 kg. The weight when the lift is moving upwards with acceleration 4.9 m s-2 is

Options:
A 882 N
B 600 N
C 306 N
D Zero

The correct answer is:
882 N

Solution:
In case of upward motion
F=mg+a
=609.8+4.9
=6014.7
=882 N

Topic: Physics, Laws of Motion, NEET
The mass of proton is $1.0073 u$ and that of neutron is $1.0087 u(u=$ atomic mass unit). The binding energy of ${ }_2^4 \mathrm{He}$ is:
(Given helium nucleus mass $\approx 4.0015$ u)

Options:
A $0.0305 \mathrm{~J}$
B $0.0305 \mathrm{erg}$
C $28.4 \mathrm{Me} \mathrm{V}$
D $0.061 \mathrm{u}$

The correct answer is:
$28.4 \mathrm{Me} \mathrm{V}$

Solution:
$\mathrm{BE}=4 m \times 931$ $=[2(1.0087+1.0073)-4.0015] \times$ 931 $=28.4 \mathrm{MeV}$.

Topic: Physics, Nuclear Physics, NEET, NEET 2003
The mass of the moon is 7.34Ã1022 kg and the radius is 1.74Ã106 m. The value of the gravitation acceleration will be

Options:
A 1.45N kg-1
B 1.55N kg-1
C 1.75N kg-1
D 1.62N kg-1

The correct answer is:
1.62N kg-1

Solution:
g=GMR2=6.67×10-11×7.34×10221.74×1062=1.62 N kg-1

Topic: Physics, Gravitation, NEET
The mass percentage of nitrogen in Histamine is?

Options:
A 18.92
B 57.2
C 37.84
D 34.64

The correct answer is:
37.84

Solution:
The structure of Histamine is

Molecular formula =C5H9N3
Molecular mass =111
% of N =wM×100
% of N=42111×100=37.84%

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
The masses of five balls at rest and lying at equal distances in a straight line are in geometrical progression with ratio 2 and their coefficients of restitution are each 23. If the first ball is started towards the second with velocity u, then the velocity communicated to 5th ball is

Options:
A 59u
B 592u
C 593u
D 594u

The correct answer is:
594u

Solution:
We know that velocity of 2nd ball after collision is given by
v2=u11+em1(m1+m2)+u2(m2-m1e)(m1+m2)
In present problem u2=0,m2=2m1 and , hence
v2=u1+23m1(m1+2m1)=59u
As four exactly similar type of collisions are taking place successively, hence velocity communicated to fifth ball
v5=594u

Topic: Physics, Center of Mass Momentum and Collision, NEET
The masses of three wires of copper are in the ratio of 1:3:5 and their lengths are in the ratio 5:3:1. The ratio of their electrical resistance is

Options:
A 1:3:5
B 5:3:1
C 1:15:125
D 125:15:1

The correct answer is:
125:15:1

Solution:
R=ρ lA,

mass=Volume×density

(d=density)

⇒ R=ρ l ldm

⇒ R∝L2m

Topic: Physics, Current Electricity, NEET
The material suitable for making electromagnets should have

Options:
A high retentivity and low coercivity
B low retentivity and low coercivity
C high retentivity and high coercivity
D low retentivity and high coercivity

The correct answer is:
high retentivity and low coercivity

Solution:
Electromagnet should have a property to give magnetising and demagnetising action very fast with the change in the magnetising field, for this it should have very low coercivity, but with the increase in current field increases and to make a strong magnet, retentivity should be higher

Topic: Physics, Magnetic Properties of Matter, NEET
The material used to make anode and cathode of the commonly employed dry cells are

Options:
A aluminium and lead
B zinc and carbon
C an alloy of silver, copper and manganese
D brass and a mixture of ammonium chloride and manganese

The correct answer is:
zinc and carbon

Solution:
Zinc → anode
Carbon → cathode

Topic: Chemistry, Electrochemistry, NEET
The materials suitable for making electromagnets should have

Options:
A High retentivity and high coercivity
B Low retentivity and low coercivity
C High retentivity and low coercivity
D Low retentivity and high coercivity

The correct answer is:
High retentivity and low coercivity

Solution:
Electromagnets are made of soft iron. The soft iron has high retentivity and low coercivity.

Topic: Physics, Magnetic Properties of Matter, NEET
The mathematical expression of diffusion pressure deficit is

Options:
A DPD = OP - TP
B DPD = OP + WP
C DPD = WP - OP
D DPD = TP + OP

The correct answer is:
DPD = OP - TP

Solution:
The value by which the diffusion pressure of a solution is lower than that of pure solvent is known as diffusion pressure deficit.
DPD or SP = OP - TP
At the equilibrium TP = WP
DPD = OP - WP.

Topic: Biology, Transport in Plants, NEET
The matrix of blood is known as

Options:
A Plasma
B Serum
C RBC and WBC
D WBC and platelets

The correct answer is:
Plasma

Solution:
Blood is a connective tissue that has a fluid matrix, called plasma, and no fibers. The extracellular matrix, called plasma, makes blood unique among all connective tissues because it is fluid. This fluid, which is mostly water, perpetually suspends the formed elements and enables them to circulate throughout the body within the cardiovascular system.

Topic: Biology, Body Fluids and Circulation, NEET
The matrix of bone is hard due to __A__ while that of cartilage is pliable due to __B__

Options:
A

A	B

Calcium salts	Chondroitin salts

B

A	B
Calcium salts	Hyaluronic acid A

C

A	B
Chondroitin sulphate	Hyaluronic acid

D

A	B
Chondroitin sulphate	Calcium salts

The correct answer is:

A	B

Calcium salts	Chondroitin salts

Solution:
Bone and cartilage both are specialized structural connective tissue. Cartilage is pliable and in embryonic life, this undergoes ossification to form bones. This formation is known as endochondrial ossification. After this ossification, some amount of cartilage persists and hence it is seen covering the bones. Cartilage forms bone by deposition of calcium and hence cartilage when it gets calcified into the bone. The matrix of cartilage consists of chondrin protein and chondroitin salts instead of calcium.

Topic: Biology, Structural Organisation in Animals, NEET
The mature male gametophyte in Angiosperms is

Options:
A 3-celled.
B 2-celled.
C 4-celled.
D multicellular.

The correct answer is:
3-celled.

Solution:
Fully developed mature pollen grain in angiosperm is a 3 celled structure and is the mature male gametophyte. In the gametophyte, cytoplasm and tube cell nucleus are found at the terminal position and the two male gametes are positioned at the back side of the tube nucleus. Majority of the angiospermic plants releases their pollen grain in 2-celled stage which develops to 3-celled on reaching the stigma. Around 40% of angiosperms, pollen grain is released at 3-celled stage.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET