datavorous/entrance-exam-dataset huggingface dataset:
The first diffraction minimum due to single slit diffraction is at an angle Î¸ for a light of wavelength 5000 â«. If the width of the slit is 1Ã10-4 cm, then the value of Î¸ is

Options:
A 30o
B 45o
C 60o
D 15o

The correct answer is:
30o

Solution:
The distance of first diffraction minimum from the central principal maximum.
x=Dλd
Since xD=λd
Or d=λsin⁡θ
sin⁡θ=λd=5000×10-101×10-6=0.5=sin⁡30o
θ=30o

Topic: Physics, Wave Optics, NEET
The first event in photosynthesis is

Options:
A Synthesis of ATP
B Photoexcitation of chlorophyll and ejection of electron
C Photolysis of water
D Release of oxygen

The correct answer is:
Photoexcitation of chlorophyll and ejection of electron

Solution:
Photoexcitation of chlorophyll and ejection of the electron is the pilot event of the photosynthetic process. When a photon of light energy falls on a chlorophyll molecule, one of the electron pairs from the ground or singlet state passes into a higher energy level called excited singlet state.

Topic: Biology, Photosynthesis in Higher Plants, NEET
The first genetic material could be:

Options:
A protein
B carbohydrates
C DNA
D RNA

The correct answer is:
RNA

Solution:
RNA was the first genetic material. There is now enough evidence to suggest that essential life processes (such as metabolism, translation, splicing, etc.), evolved around RNA.

Topic: Biology, Molecular Basis of Inheritance, NEET
The first human hormone produced by recombinant DNA technology is:

Options:
A Insulin
B Estrogen
C Thyroxin
D Progesterone

The correct answer is:
Insulin

Solution:
The first hormone to be genetically engineered is insulin and is commercially available as the brand name humulin. Eli Lilly is the American company for the first time that produced this recombinant insulin in E. coli.

Topic: Biology, Biotechnology and Its Applications, NEET, NEET 2014
The first human hormone produced by recombinant DNA technology is:

Options:
A Insulin
B Estrogen
C Thyroxin
D Progesterone

The correct answer is:
Insulin

Solution:
The first hormone to be genetically engineered i.e. insulin is commercially available as humulin.

Topic: Biology, Biotechnology - Principles and Processes, NEET
The first (ΔiH1) and second (ΔiH2) ionization enthalpies (in kJ mol-1 ) and the electron gain enthalpy (ΔegH) (in kJ mol-1 ) of the elements I, II, III, IV and V are given below:

Element	ΔiH1	ΔiH2	ΔegH

I	520	7300	-60

II	419	3051	-48

III	1681	3374	-328

IV	1008	1846	-295

V	2372	5251	+48

The most reactive metal and the least reactive non-metal of these are respectively

Options:
A V and II
B II and V
C V and III
D IV and V

The correct answer is:
II and V

Solution:
∆H1=520
∆H2=7300
∆H2 is 10 times greater than ∆H1 mean first e- remove from inner shell {Ionisation energy decreases the number of shells increases because Zeff decreases hence, removal of electron is easy so, I.E.↓
III ∆iH1<∆iH2
IV ∆iH1<∆iH2
V ∆iH1<∆iH2
∆HeffH=+ve
∆HeffH=+ve Means it belongs to inert gas & these are belongs to non-metal and very less reactive
So, II most reactive metal.
V is least reactive non-metal.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first (∆iH1) and the second (∆iH2) ionisation enthalpies (in kJ mol–1) and the (∆egH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:
Which of the above elements is likely to be the least reactive element?

Options:
A ɪ
B ɪɪ
C V
D Vɪ

The correct answer is:
V

Solution:
Correct Option is : (C)
V

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first (∆iH1) and the second (∆iH2) ionisation enthalpies (in kJ mol–1) and the (∆egH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:
Which of the above elements is likely to be the most reactive metal?

Options:
A ɪɪɪ
B ɪɪ
C ɪV
D V

The correct answer is:
ɪɪ

Solution:
Correct Option is : (B)
ɪɪ

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first (∆iH1) and the second (∆iH2) ionisation enthalpies (in kJ mol–1) and the (∆egH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:
Which of the above elements is likely to be the most reactive non-metal?

Options:
A ɪɪɪ
B ɪ
C Vɪ
D ɪV

The correct answer is:
ɪɪɪ

Solution:
Correct Option is : (A)
ɪɪɪ

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first (∆iH1) and the second (∆iH2) ionisation enthalpies (in kJ mol–1) and the (∆egH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:
Which of the above elements is likely to be the metal which can form a stable binary halide of the formula MX2(X=halogen)?

Options:
A ɪ
B Vɪ
C ɪɪ
D V

The correct answer is:
Vɪ

Solution:
Correct Option is : (B)
Vɪ

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first (∆iH1) and the second (∆iH2) ionisation enthalpies (in kJ mol–1) and the (∆egH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:
Which of the above elements is likely to be the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?

Options:
A ɪɪɪ
B ɪV
C ɪ
D V

The correct answer is:
ɪ

Solution:
Correct Option is : (C)
ɪ

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first (∆iH1) and the second (∆iH2) ionisation enthalpies (in kJ mol–1) and the (∆egH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:
Which of the above elements is likely to be the least reactive non-metal?

Options:
A ɪɪ
B V
C ɪɪɪ
D ɪV

The correct answer is:
V

Solution:
Correct Option is : (B)
V

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first ionisation energies of magnesium and aluminium are respectively given by

Options:
A 7.64, 5.98
B 7.64, 7.64
C 5.98, 7.64
D 5.98, 5.98

The correct answer is:
7.64, 5.98

Solution:
IE of Mg>IE of Al
Electronic configuration of
Mg=1s2,2s2,2p2,3s2
Al=1s2,2s2,2p6,3s2,3p1
Mg has stable configuration (fulfilled) than Al so removal of an electron is difficult hence, required more energy i.e. more ionisation energy.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first ionisation enthalpy (∆iH) values of third-period elements, Na, Mg and Si are respectively 496, 737 and 786 kJ mol–1. Which of the following is the correct statement regarding the first ∆iH value for Al?

Options:
A Lower than ∆iH value of Magnesium
B Higher than ∆iH value of Silicone
C Same as ∆iH value of Sodium
D Cannot be discussed without further information

The correct answer is:
Lower than ∆iH value of Magnesium

Solution:
Correct Option is : (A)
Lower than ∆iH value of Magnesium

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first ionisation enthalpy values (in kJ mol–1) of group 13 elements are - B Al Ga In Tl 801 577 579 558 589 Which of the following options explains this deviation from the general trend?

Options:
A Due to the poor shielding effect of d and f electrons
B Due to the presence of 3 electrons in the outermost shell
C Due to high reactivity
D Due to behaviour as Lewis acids

The correct answer is:
Due to the poor shielding effect of d and f electrons

Solution:
Correct Option is : (A)
Due to the poor shielding effect of d and f electrons

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first ionisation potential is maximum for

Options:
A V
B Ti
C Cr
D Mn

The correct answer is:
Mn

Solution:
The first ionization energies of Ti, V, Cr and Mn are 656,650,652 and 717 kJ/mole respectively. I.E. increase in a period from L→R hence, manganese has maximum first ionisation potential.

Topic: Chemistry, d and f Block Elements, NEET
The first ionization constant of H2S is 9.1 × 10-8. Calculate the concentration of HS⁻ ion in its 0.1 M solution. If the second dissociation constant of H2S is 1.2 × 10-13, calculate the concentration of S²⁻ under both conditions.

Options:
A 1.2 × 10-13, 1.74 × 10-5
B 3.2 × 10-8, 1.0 × 10-7
C 1.0 × 10-7, 1.0 × 10-7
D 3.2 × 10-8, 3.2 × 10-8

The correct answer is:
1.2 × 10-13, 1.74 × 10-5

Solution:
Correct Option is : (A)
1.2 × 10-13, 1.74 × 10-5

Topic: Chemistry, Ionic Equilibrium, NEET
The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be

Options:
A -5.1 eV
B -10.2 eV
C +2.55 eV
D -2.55 eV

The correct answer is:
-5.1 eV

Solution:
Ionization energy = 5.1 eV
Electron gain enthalpy = negative value of ionization energy = – 5.1 eV
As electron gain enthalpy is the energy released when an electron is added to the isolated gaseous atom so it is exothermic by nature.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The first living cells to evolve were

Options:
A anaerobic chemoautotrophs
B anaerobic chemoheterotrophs
C aerobic chemoautotrophs
D aerobic chemoheterotrophs

The correct answer is:
anaerobic chemoheterotrophs

Solution:
The first living cells were unicellular with naked DNA. There was no oxygen in the environment hence they were anaerobic. They could not prepare their own food and derived their nutrition from the surrounding chemicals. Hence, they were chemoheterotrophs.

Topic: Biology, Evolution, NEET
The first mammals which were originated on the earth were similar to:

Options:
A Dogs
B Horses
C Shrews
D Monkeys

The correct answer is:
Shrews

Solution:
The first mammals were like shrews. They are small molecule like mammals. Their fossils are small sized. Mammals were viviparous and protected their unborn young inside the mother's body.

Topic: Biology, Evolution, NEET
The first movements of the fetus are observed during

Options:
A First month
B First trimester
C Fifth month
D End of nine months

The correct answer is:
Fifth month

Solution:
Human pregnancy lasts for nine months and it officially begins after implantation i.e. 8th day after fertilization. The sign of developing foetus is first recorded at the end of 1st month as heart sounds are clear and audible. The foetus develops limbs and digits by the end of 60 days. Major systems also develop in the third month of pregnancy. The first movements of foetus and appearance of hair (known as Lanugo) on head is seen during fifth month.

Topic: Biology, Human Reproduction, NEET
The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregancy?

Options:
A Fourth month
B Fifth month
C Sixth month
D Third month

The correct answer is:
Fifth month

Solution:
During development of foetus in human by week 20 , hair begin to grow including eyebrows and eyelashes, fingerprints develop. Fingernails and toe nails grow. Firm hand grip. Between 16 and 20 weeks baby usually felt moving for first time.

Topic: Biology, Human Reproduction, NEET, NEET 2010 (Screening)
The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?

Options:
A Fourth month
B Sixth month
C Third month
D Fifth month

The correct answer is:
Fifth month

Solution:
In human beings, after one month of pregnancy, the embryo's heart is formed. By the end of the second month of pregnancy, the foetus develops limbs & digits. By the end of 12 weeks (first trimester), most of the major organ systems are formed. The first movements of the foetus & appearance of hair on the head are usually observed during the fifth month. By the end of 24 weeks (second trimester), the body is covered with fine hair, eye-lids separate, and eyelashes are formed. By the end of nine months of pregnancy, the foetus is fully developed and is ready for delivery.

Topic: Biology, Human Reproduction, NEET
The first non-cellular form of life could have originated on the earth:

Options:
A About 3 billion years ago
B About 2 billion years ago
C About 4.5 billion years ago
D About 20 billion years ago

The correct answer is:
About 3 billion years ago

Solution:
About 4.5 billion years agoThe origin of the earth.
About 3 billion years agoOrigin of first non-cellular form of life.
About 2 billion years ago Origin of first cellular form of life
About 20 billion years agoOrigin of universe by Big-bang theory.

Topic: Biology, Evolution, NEET
The first order rate constant for the decomposition of ethyl iodide by the reaction: C2H5I (g) → C2H4(g) + HI(g) at 600K is 1.60 × 10–5s–1. Its energy of activation is 209 kJ/mol. Calculate the rate constant of the reaction at 700K.

Options:
A 9.82 × 10–3s–1
B 3.34 × 10–3s–1
C 2.14 × 10–3s–1
D 6.36 × 10–3s–1

The correct answer is:
6.36 × 10–3s–1

Solution:
Correct Option is : (D)
6.36 × 10–3s–1

Topic: Chemistry, Chemical Kinetics, NEET
The first organisms which released oxygen in the environment by its photosynthesis were:

Options:
A Cyanobacteria
B Sulpher bacteria
C Iron bacteria
D Planktonic sulpher bacteria

The correct answer is:
Cyanobacteria

Solution:
Cyanobacteria or BGA are first photosynthetic organism on earth which stared production of oxygen in their photosynthesis, thus their photosynthesis is called as oxygenic photosynthesis. They had chlorophyll a similar to higher plants thus were capable of causing photolysis of water to release oxygen.

Topic: Biology, Biological Classification, NEET
The first phase of translation is

Options:
A Recognition of DNA molecule
B Aminoacylation of tRNA
C Recognition of an anti-codon
D Binding of mRNA to ribosome

The correct answer is:
Aminoacylation of tRNA

Solution:
The steps of the translation mechanism are:

Activation of amino acids: In the presence of enzyme aminoacyl-tRNA synthetase (E), a specific amino acid (AA) binds with ATP.

AA1 + ATP →Mg+2Aminoacyl synthetase AA1-AMP-Enzyme complex + PPi

b) Charging of tRNA: The AA1–AMP–E1 complex reacts with specific tRNA. Thus, the amino acid is transferred to tRNA. As a result, the enzyme and AMP are liberated. It is also called aminoacylation of tRNA.

AA1-AMP-Enzyme complex + tRNA →AA1-tRNA + AMP + Enzyme

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2020 (Phase 1)
The first plants to appear after a forest fire are the ferns, this is because of the survival of their

Options:
A Spores
B Leaves
C Rhizomes
D Both fronds and rhizomes

The correct answer is:
Rhizomes

Solution:
Ferns are generally the first colonizers of burnt down forest area. This is due to persistence of their underground rhizomes while the above ground parts get burnt up.

Topic: Biology, Plant Kingdom, NEET
The first product of photosynthesis is sugar and it is converted

Options:
A Into starch in all plants
B Into proteins
C Into vitamins
D Rarely into anything else

The correct answer is:
Into starch in all plants

Solution:
Sugar is the first product of photosynthesis and it is converted to starch in all the plants. The hydrogen, carbon, and oxygen of carbon dioxide are converted into a series of increasingly complex compounds to result in finally a stable organic compound, glucose (or starch) and water.

Topic: Chemistry, Biomolecules, NEET
The first reaction of Kreb's cycle includes:

Options:
A Condensation of citric acid with acetyl CoA and formation of alpha-ketoglutaric acid
B Condensation of cis-aconitic acid with acetyl coenzyme-A and formation of citric acid
C Condensation of oxalosuccinic acid with acetyl CoA and formation of citric acid
D Condensation of oxaloacetic acid with acetyl CoA and formation of citric acid

The correct answer is:
Condensation of oxaloacetic acid with acetyl CoA and formation of citric acid

Solution:
After oxidative decarboxylation of pyruvate, Acetyl CoA is formed which then combines with oxaloacetic acid in a condensation reaction to form citric acid.

Topic: Biology, Respiration in Plants, NEET
The first restriction enzyme was isolated from which bacteria

Options:
A E. coli
B Haemophilus influenzae
C Pseudomonas
D Xanthomonas

The correct answer is:
Haemophilus influenzae

Solution:
The first restriction enzyme is Hind II, which was isolated from bacteria Haemophilus influenza. Restriction endonuclease Hind II always cuts DNA molecules at a particular point by recognizing a specific sequence of six base pairs.

Topic: Biology, Biotechnology - Principles and Processes, NEET
The first site for observing chyme in the human gut is

Options:
A buccal cavity.
B duodenum.
C stomach.
D colon.

The correct answer is:
stomach.

Solution:
The stomach stores the food for 4-5 hours. The food mixes thoroughly with the acidic gastric juice of the stomach by the churning movements of its muscular wall and is called the chyme. The proenzyme pepsinogen, on exposure to hydrochloric acid gets converted into the active enzyme pepsin, the proteolytic enzyme of the stomach. Pepsin converts proteins into proteoses and peptones (peptides).

Topic: Biology, Digestion and Absorption, NEET
The first stable compound of the Calvin cycle is

Options:
A 3 C compound called 1,3-Biphosphoglycerate
B 3 C compound called 3-Phosphoglycerate
C 3 C compound called 3-Phosphoglyceraldeyde
D 3 C compound called pyruvate

The correct answer is:
3 C compound called 3-Phosphoglycerate

Solution:
The first step of the Calvin Cycle is when RuBP combines with CO2 to form a 6 carbon unstable compound in the presence of enzyme RubisCO. This 6 carbon compound spontaneously forms two molecules of 3C compound called phosphoglyceric acid, which is the first stable compound of the Calvin cycle. Hence, it is also called C3 cycle.

Topic: Biology, Photosynthesis in Higher Plants, NEET
The first stable product of CO2 fixation in Sorghum is:

Options:
A Pyruvic acid
B Oxaloacetic acid
C Succinic acid
D Phosphoglyceric acid

The correct answer is:
Oxaloacetic acid

Solution:
Sorghum is a C4 plant, thus the first stable product of CO2 fixation in this plant is Oxaloacetic acid (4 carbon compound).

Topic: Biology, Photosynthesis in Higher Plants, NEET, NEET 2021
The first stable product of fixation of atmospheric nitrogen in leguminous plants is

Options:
A $\mathrm{NO}_2^{-}$
B ammonia
C $\mathrm{NO}_3^{-}$
D glutarnate

The correct answer is:
ammonia

Solution:
The process of conversion of nitrogen $\left(\mathrm{N}_2\right)$ to ammonia is termed as nitrogen fixation.
$$
\mathrm{N}_2 \rightarrow \mathrm{N}_2 \mathrm{H}_2 \rightarrow \mathrm{N}_2 \mathrm{H}_4 \rightarrow 2 \mathrm{NH}_3
$$
(Nitrogen) (Dimide) (Hydrazine) (Ammonia)
$$
\begin{aligned}
& 2 \mathrm{NH}_3+3 \mathrm{O}_2 \longrightarrow 2 \mathrm{NO}_2^{-}+2 \mathrm{H}^{+}+2 \mathrm{H}_2 \mathrm{O} \\
& 2 \mathrm{NO}_2+\mathrm{O}_2 \longrightarrow 2 \mathrm{NO}_3^{-}
\end{aligned}
$$
In reductive animation ammonia reacts with $\alpha$-ketoglutaric acid and forms glutamic acid $\alpha$-ketoglutaric acid $+\mathrm{NH}_4^{+}+\mathrm{NADPH}$
$$
\underset{\text { Dehydrogenae }}{\stackrel{\text { Glutamate }}{\longrightarrow}} \text { Glutamate }+\mathrm{H}_2 \mathrm{O}+\mathrm{NADP}
$$

Topic: Biology, Mineral Nutrition, NEET, NEET 2013 (All India)
The first step of an enzyme catalysed reaction is:

Options:
A The enzyme breaks the chemical bond of the substrate.
B The enzyme releases the product of the reaction.
C The substrate binds to the active site of the enzyme.
D The binding site reacts with the substrate forming the enzyme product complex.

The correct answer is:
The substrate binds to the active site of the enzyme.

Solution:
For any enzyme catalysed reaction to occur, enzyme-substrate (ES) complex formation is the prerequisite. The substrate binds to active site of enzyme molecule forming the ES complex.

Topic: Chemistry, Biomolecules, NEET
The first transgenic cow, Rosie, produced human protein-enriched milk. Which of the following year it was produced and what is the human protein produced in the milk?

Options:
A In 1993 and Î²- lactamase enzyme
B In 1997 and Î±- lactalbumin protein
C In 1999 and Î±-1-antitrypsin enzyme
D In 1993 and adenosine deaminase enzyme

The correct answer is:
In 1997 and α- lactalbumin protein

Solution:
The first transgenic cow, Rosie, was produced by Rosalin Institute in1997. The transgenic cow produced a human protein (alpha-lactalbumin) enriched milk (2.4 grams per litre). It was nutritionally a more balanced product for human babies than natural cow-milk.

Topic: Biology, Biotechnology and Its Applications, NEET
The first transgenic plant developed was a

Options:
A herbicide-resistant potato
B virus-resistant tomato
C antibiotic-resistant tobacco
D salt-tolerant maize

The correct answer is:
antibiotic-resistant tobacco

Solution:
Plant breeding approaches that use Recombinant DNA technology used for creating new genetically engineered varieties are called transgenic plants. These include agrobacterium mediated gene transfer, gene gun method, etc. It's been used to make varieties with additional nutrient requirement, virus and herbicide resistant, salt tolerance and many more. The first genetically modified crop, an antibiotic-resistant tobacco plant, was produced in 1982.

Topic: Biology, Biotechnology and Its Applications, NEET
The first viral disease detected in human being was

Options:
A Cold
B Influenza
C Small pox
D Yellow fever

The correct answer is:
Yellow fever

Solution:
Yellow fever was the first viral disease detected in human being.

Topic: Chemistry, Chemistry in Everyday Life, NEET
The first-order reaction 2N2O(g)â2N2(g)+O2(g)
Has a rate constant of 1.3Ã10-11 s-1 at 270 oC and 4.5Ã10-10 s-1 at 350 oC. What is the activation energy for this reaction?

Options:
A 155 kJ
B 230 kJ
C 68 kJ
D 124.6 kJ

The correct answer is:
124.6 kJ

Solution:
log10k2k1=Ea2.303R1T1-1T2
R=8.314 JK-1mol-1
T1=(273+270)K=543 K
T2=(273+350)K=623 K
k2=4.5Ã10-10s-1,k1=1.3Ã10-11s-1
log 10 4.5Ã 10 â10 1.3Ã 10 â11 = E a 2.303Ã8.314 1 543 â 1 623
1.534=Ea19.147180543Ã623
Ea=1.534Ã19.14712.364Ã10-4=124.6 kJ

Topic: Chemistry, Chemical Kinetics, NEET
The five kingdom system of classification was proposed by ___, in the year ____.

Options:
A Whittaker, 1960
B Whittaker, 1969
C John Ray, 1975
D de Candole, 1978

The correct answer is:
Whittaker, 1969

Solution:
R.H. Whittaker proposed the five kingdom classification system in 1969 (The most accepted and followed system of classification). The organisms were categorized based on-
Ecological life style
Complexity of cell structures and body structures
Mode of obtaining nutrition
Phylogenetic relationship
The five kingdoms are Monera, Protista, Fungi, Plantae, and Animalia.

Topic: Biology, Biological Classification, NEET
The five-kingdom classification was proposed by

Options:
A R.H. Whittaker
B C.Linnaeus
C A.Roxberg
D Virchow

The correct answer is:
R.H. Whittaker

Solution:
The five-kingdom classification was proposed by R.H. Whittaker in 1969.

Topic: Biology, Biological Classification, NEET
The fixed nitrogen is exported in soyabean in the form of:

Options:
A Nitrite
B Ureides
C Molecular nitrogen
D Nitrate

The correct answer is:
Ureides

Solution:
Amides contain more nitrogen than the amino acids, they are transported to other parts of the plant via xylem vessels. In addition, along with the transpiration stream the nodules of some plants (e.g., soyabean) export the fixed nitrogen as ureides.

Topic: Biology, Mineral Nutrition, NEET
The flat horizontal line in between the waves of ECG represents time when

Options:
A there is no mechanical activity in the heart but there is electrical activity in the heart
B there is no electrical activity in the heart but there is mechanical activity in the heart
C there is no mechanical activity in the heart and there is no electrical activity in the heart
D there is mechanical activity in the heart and there is electrical activity in the heart

The correct answer is:
there is no electrical activity in the heart but there is mechanical activity in the heart

Solution:
Electrocardiogram ECG has P wave, QRS complex and T wave. The P wave is an upward wave and indicates atrial depolarisation, QRS complex indicates ventricular depolarization. T wave is an upward wave and indicates ventricular repolarisation. The flat horizontal line is called the isoelectric line. There is no electrical activity, but there will be mechanical activity. Example: ST segment indicates atrial contraction.

Topic: Biology, Body Fluids and Circulation, NEET