datavorous/entrance-exam-dataset huggingface dataset:
Which of the following antibody shows the strongest agglutination?

Options:
A IgA
B IgD
C IgE
D IgM

The correct answer is:
IgM

Solution:
IgM exists as a pentamer and each molecule possesses 10 antigen-binding sites. IgA is abundant in tears, saliva, breast milk, and in secretions of the gastrointestinal and respiratory tracts. IgM is frequently seen in the immune response to antigenically complex organisms like viruses and bacteria. It also activate complement system.

Topic: Biology, Human Health and Diseases, NEET
Which of the following are broad spectrum antibiotics?
\(\begin{array}{cccl} \hline \text { Penicillin G } & \begin{array}{c} \text { Chloramphenicol } \end{array} & \text { Ofloxacin } & \text { Ampicillin } \\ \hline \text { (I) } & \text { (II) } & \text { (III) } & \text { (IV) } \\ \hline \end{array}\)

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

The correct answer is:
II, III, IV

Solution:
Chloramphenicol (II), ofloxacin (III) and ampicillin (IV) are examples of broad spectrum antibiotics.
Penicilin-G is a narrow spectrum antibiotics. Hence, option (3) is correct.

Topic: Chemistry, Chemistry in Everyday Life, AP EAMCET, AP EAMCET 2019 (20 Apr Shift 1)
Which of the following are correct in respect of the system of equations $x+y+z=8, x-y+2 z=6$ and $3 x-y+5 z=k$ ?
$1.$ $\mathrm{f}(\theta) \times \mathrm{f}(\phi)=\mathrm{f}(\theta+\phi)$
$2.$ They have infinitely many solutions, if $\mathrm{k}=20$.
$3.$ They have unique solution, if $\mathrm{k}=25$
Select the correct answer using the code given below:

Options:
A 1 and 2 only
B 2 and 3 only
C 1 and 3 only
D 1,2 and 3

The correct answer is:
1 and 2 only

Solution:
Here $\left[\begin{array}{ccc}1 & 1 & 1 \\ 1 & -1 & 2 \\ 3 & -1 & 5\end{array}\right]\left[\begin{array}{l}x \\ y \\ z\end{array}\right]=\left[\begin{array}{l}8 \\ 6 \\ k\end{array}\right]$ or $A X=B$.
$|A|=0(\because$ the system does not have a unique solution $)$
Now, $(\operatorname{Adj} A)=\left[\begin{array}{ccc}-3 & -6 & 3 \\ 1 & 2 & -1 \\ 2 & 4 & -2\end{array}\right]$ and $B=\left[\begin{array}{l}8 \\ 6 \\ k\end{array}\right]$
For $k=15,(\operatorname{Adj} A) B=\left[\begin{array}{c}-24-36+15 \\ 8+12-15 \\ 16+24-30\end{array}\right]=\left[\begin{array}{c}-45 \\ 5 \\ 10\end{array}\right] \neq 0$
( $\because$ system is inconsistent i.e., it has no solution)
For $k=20,(\operatorname{Adj} A) B=\left[\begin{array}{c}-24-36+60 \\ 8+12-20 \\ 16+24-40\end{array}\right]=\left[\begin{array}{l}0 \\ 0 \\ 0\end{array}\right]=0$
$(\because$ system has infinitely many solutions)

Topic: Mathematics, Determinants, NDA, NDA 2016 (Phase 2)
Which of the following are correctly matched?

I. Arsenic poisoning - Black foot disease
II. Secondary effluent treatment - Biological process
III. Pyrolysis - Solid soil waste disposal
IV. Tubifex - Water pollution indicator
V. Biomagnification - Degradable pollutants

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

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

Solution:
Biomagnification or biological amplification is the passing of non-degradable pollutants like pesticides (DDT), etc, into the food chain and increase in amount per unit weight of organisms with the rise in trophic level due to accumulation in the body.

Topic: Biology, Environmental Issues, NEET
Which of the following are not secondary metabolites in plants?

Options:
A Morphine, codeine
B Amino acids, glucose
C Vinblastin, curcumin
D Rubber, gums

The correct answer is:
Amino acids, glucose

Solution:
Amino acids and glucose are not considered secondary metabolites. They are primary metabolites.

Morphine and codeine are alkaloids.

Rubber and gums are polymeric substances and are secondary metabolites.

On the other hand, vinblastin, curcumin etc. are drugs obtained from plants.

All these are considered as secondary metabolites in plants.

Topic: Biology, Biomolecules (B), NEET, NEET 2021
Which of the following are the two roots of the equation $\left(x^{2}+2\right)^{2}+8 x^{2}=6 x\left(x^{2}+2\right) ?$

Options:
A $1 \pm i$
B $2 \pm i$
C $1 \pm \sqrt{2}$
D $2 \pm i \sqrt{2}$

The correct answer is:
$1 \pm i$

Solution:
Given eq $^{n}$ is $\left(x^{2}+2\right)^{2}+8 x^{2}=6 x\left(x^{2}+2\right)$
$\Rightarrow x^{4}+4 x^{2}+4+8 x^{2}=6 x^{3}+12 x$
$\Rightarrow x^{4}-6 x^{3}+12 x^{2}-12 x+4=0$
$\left(x^{2}+2\right)^{2}+8 x^{2}=6 x\left(x^{2}+2\right)$
$\Rightarrow x^{4}+4 x^{2}+4+8 x^{2}=6 x^{3}+12 x$
$\Rightarrow x^{4}-6 x^{3}+12 x^{2}-12 x+4=0$
This can be factorised into $\left(x^{2}-4 x+2\right)\left(x^{2}-2 x+2\right)=0$ Consider, $x^{2}-2 x+2=0$
Roots are $\frac{-(-2) \pm \sqrt{(-2)^{2}-4(2)(1)}}{2(1)}=\frac{2 \pm \sqrt{4-8}}{2}$
$=\frac{2 \pm \sqrt{-4}}{2}=\frac{2 \pm 2 i}{2}=1 \pm i$
Also, this equation is satisfied by $1 \pm i$. Hence, required
roots are $1 \pm i$.

Topic: Mathematics, Quadratic Equation, NDA, NDA 2010 (Phase 2)
Which of the following arrangements of xylem is found in the stem of plants?

Options:
A Endarch
B Exarch
C Mesarch
D Polyarch

The correct answer is:
Endarch

Solution:
The stem shows endarch arrangement of xylem. In endarch condition, the protoxylem is present towards the centre and metaxylem is present towards the periphery. Roots show exarch arrangement, in which protoxylem is towards periphery and metaxylem is towards centre.

Topic: Biology, Anatomy of Flowering Plants, NEET
Which of the following arrangements of xylem is observed in a stem?

Options:
A protoxylem lies towards pith in the centre
B metaxylem lies towards the periphery of the organ
C an endarch arrangement is present
D All the above

The correct answer is:
All the above

Solution:
Early formed smaller xylem is called as protoxylem and later formed xylem is called as metaxylem. In stem xylem is endarch, with protoxylem placed towards the cemter and metaxylem is placed towards the outer side or periphery.

Topic: Biology, Anatomy of Flowering Plants, NEET
Which of the following atomic and physical properties of hydrogen is false?

Options:
A Hydrogen > Deuterium > Tritium; (melting point/K)
B Hydrogen $ \lt $ Deuterium $ \lt $ Tritium; (boiling point/K)
C Hydrogen $ \lt $ Deuterium $ \lt $ Tritium; (density $/ g \mathrm{gL}^{-1}$ )
D Hydrogen > Deuterium > Tritium;
(\% relative abundance)

The correct answer is:
Hydrogen > Deuterium > Tritium; (melting point/K)

Solution:

Topic: Chemistry, Hydrogen, JIPMER, JIPMER 2015
Which of the following best explains the abiotic components in a pond ecosystem?

Options:
A Water with dissolved inorganic substances
B Water with dissolved inorganic and organic substances
C Water with dissolved inorganic and organic substances and also the soil at the bottom
D Water without any dissolved substances.

The correct answer is:
Water with dissolved inorganic and organic substances and also the soil at the bottom

Solution:
Pond is a shallow water body which is having all the four basic components of an ecosystem.
- Abiotic components : Water with dissolved inorganic and organic substances and the rich soil deposited at the bottom of the pond.
- Biotic components involve :
A. Autotrophs- Phytoplankton, some algae and the floating, submerged and marginal plants found at the edges.
B. Consumers- Zooplanktons, the free swimming and bottom dwelling forms.
C. Decomposers- Fungi, bacteria and flagellates (usually abundant at the sea floor).
- Pond is a self-sustainable unit.

Topic: Biology, Ecosystem, NEET
Which of the following can be related to the tissue called blood?

Options:
A It has a fibre-free matrix but rich in collagen protein
B It has both nucleated and non-nucleated cells, performing aerobic respiration
C Blood is a specialised connective tissue
D It is a form of dense connective tissue, having dense arrangement due to large count of RBCs

The correct answer is:
Blood is a specialised connective tissue

Solution:
Connective tissue is the most abundant tissue in animals. This tissue is further divided into three types: Loose connective tissue, dense connective tissue, and specialized connective tissue. Loose connective tissue shows a matrix with cells and fibers. These are areolar and adipose tissue. Dense connective tissues are tendons and ligaments. These are known as dense as fibers and cells are densely packed in the matrix. Specialized connective tissues are fluid connective tissues or supporting connective tissues. Fluid connective tissues are blood and lymph as these are fluid and thus fibres are absent. Supporting connective tissues include bone and cartilage as these have lacunae.

Topic: Biology, Structural Organisation in Animals, NEET
Which of the following can be used as a biocontrol agent in treatment of Plant diseases?

Options:
A Trichoderma
B Chlorella
C Anabaena
D Lactobacillus

The correct answer is:
Trichoderma

Solution:
Trichoderma is one of the most abundant fungi that have been shown to be present in all climatic zone's soil. Among all the biocontrol agents, Trichoderma sp. like Trichoderma harzianum is the most abundantly used against plant pathogens. Many species of Trichoderma produce volatile and non-volatile antibiotics and enzymes which are antagonistic to phytopathogenic fungi and nematodes.

Topic: Biology, Microbes in Human Welfare, NEET, NEET 2019 (All India)
Which of the following can help to predict the rate of reaction if the standard Gibb's free energy of reaction Δ r G o is known?

Options:
A Equilibrium constant
B Δ r H o
C Δ r U o
D Heat liberated during the course of reaction in calorimeter

The correct answer is:
Equilibrium constant

Solution:
As Δ r G o (Gibbs free energy) is related to K (equilibrium constant) as follows
ΔG o  = −2.303 RT  log 10  K
here, R = Gas constant
T = Temperature in Kelvin
By knowing the value of K we can find out the rate of a reaction.

Topic: Chemistry, Electrochemistry, NEET
Which of the following cells during gametogenesis is normally diploid?

Options:
A Primary polar body
B Spermatid
C Spermatogonia
D Secondary polar body

The correct answer is:
Spermatogonia

Solution:
Spermatogonia or the sperm mother cell is diploid while all other cells are formed as a result of meiotic division and hense are haploid in nature.

Topic: Biology, Human Reproduction, NEET, NEET 2015 (Phase 1)
Which of the following changes does not occur during conversions of secondary follicle into tertiary follicle?

Options:
A Development of antrum.
B Differentiation of theca layers.
C Primary oocyte completes meiosis-I.
D Second polar body is released.

The correct answer is:
Second polar body is released.

Solution:
Following changes occur in the secondary follicle after which it is immediately converted to tertiary follicle:
A. Development of a fluid-filled cavity called antrum.
B. Differentiation of theca layer into theca interna (inner) and theca externa (outer).
C. Primary oocyte grows in size, completes meiosis-I (unequal division) resulting in the formation of a large haploid secondary oocyte and a small first polar body.

Topic: Biology, Human Reproduction, NEET
Which of the following characteristics does not belong to Labeo (Rohu)?

Options:
A Streamline body
B operculated gills
C air bladder absent
D terminal mouth

The correct answer is:
air bladder absent

Solution:
Rohu is a bony fish having a streamlined body, with 4 pairs of operculated gills, terminal mouth and air bladder. Labeo rohita is the scientific name and is a species of fish of the carp family.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
Which of the following characteristics is correct for epithelial tissues?

Options:
A The cells are compactly packed with fluid intercellular matrix
B The cells are loosely packed with abundant intercellular matrix
C The cells are compactly packed with little or no intercellular matrix
D The cells are loosely packed with little intercellular matrix

The correct answer is:
The cells are compactly packed with little or no intercellular matrix

Solution:
Epithelial tissues are the major tissue in glands and form the outer covering or layer of all body surfaces and organs. It consists of closely aggregated cells that adhere firmly to each other and forming either single or multiple layers. Due to the cells being tightly packed there is the very little intercellular matrix. The intercellular matrix consists of protein and is on the cell membrane of epithelial cells

Topic: Biology, Structural Organisation in Animals, NEET
Which of the following combinations is correct for Wheat?

Options:
A Genus Triticum, family Poaceae, order Poales, Class Dicotyledonae
B Genus Triticum, family Poaceae, order Sapindales, class Monocotyledonae.
C Genus Triticum, family Poaceae, order Poales, Class Moncotyledonae.
D Genus Triticum, family Anacardiaceae, order Poales, class Monocotyledonae

The correct answer is:
Genus Triticum, family Poaceae, order Poales, Class Moncotyledonae.

Solution:
The botanical name of wheat is Triticum aestivum. So the genus of wheat is Triticum. Wheat belongs to the Poaceae or Gramineae family. It is a big and nearly universal family of grasses. The stem of grass is called a culm. The flowers of Poaceae are characteristically arranged in spikelets and enclosed by bracts. Those species come in order Poales they show pollination by winds i.e.anemophily. Single cotyledon is present so they belong to Monocotyledonae class.

Topic: Biology, The Living World, NEET
Which of the following compounds has the highest standard molar entropy?

Options:
A SO2g
B SO3g
C CO2g
D COg

The correct answer is:
SO3g

Solution:
We know that the molar entropy is an intensive property, and it is a state function which depends on the initial and final state. Now, randomness is measure of the entropy, more will be entropy more will be the randomness. The order of the randomness in different phases of matter is given by:

Solid<Liquid<Gas

Moreover, randomness increase with the increase in molecular weight, complexity and with increase in temperature, but it decreases with increase in pressure.

Now, from the given options SO3 has higher molecular weight i.e. 80 g/mol and hence option B is the correct choice.

Topic: Chemistry, Thermodynamics (C), TS EAMCET, TS EAMCET 2021 (04 Aug Shift 2)
Which of the following compounds is NOT present in it's standard state at $25^{\circ} \mathrm{C}$ and 1 atmosphere pressure?

Options:
A $\mathrm{CO}_{2(\mathrm{~g})}$
B $\mathrm{CaCO}_{3(\mathrm{~s})}$
C $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}_{(\mathrm{l})}$
D $\mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}$

The correct answer is:
$\mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}$

Solution:
$\mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}$
Water at $25^{\circ} \mathrm{C}$ is present in a liquid state.

Topic: Chemistry, Hydrogen, MHT CET, MHT CET 2020 (13 Oct Shift 1)
Which of the following compounds on reaction with Grignard reagent followed by hydrolysis forms secondary alcohol?

Options:
A $\mathrm{CH}_3 \mathrm{CHO}$
B $\mathrm{HCHO}$
C $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COCH}_3$
D $\mathrm{CH}_3 \mathrm{COCH}_3$

The correct answer is:
$\mathrm{CH}_3 \mathrm{CHO}$

Solution:
Aldehydes (except formaldehyde) on reaction with Grignard reagent followed by hydrolysis forms secondary alcohol.
$\therefore \mathrm{CH}_3 \mathrm{CHO}$ forms secondary alcohol.

Topic: Chemistry, Alcohols Phenols and Ethers, MHT CET, MHT CET 2021 (20 Sep Shift 2)
Which of the following correctly explains a phase/ event in the cardiac cycle in a standard electrocardiogram?

Options:
A QRS complex indicates atrial contraction.
B QRS complex indicates ventricular contraction.
C The time between S and T represents atrial systole.
D P-wave indicates the beginning of ventricular contraction.

The correct answer is:
QRS complex indicates ventricular contraction.

Solution:
QRS complex indicates ventricular contraction. One can determine the heartbeat rate by counting the number of QRS complexes in an ECG.

Topic: Biology, Body Fluids and Circulation, NEET
Which of the following corresponds to the energy of the possible excited state of hydrogen?

Options:
A $-13.6 \mathrm{eV}$
B $13.6 \mathrm{eV}$
C $-3.4 \mathrm{eV}$
D $3.4 \mathrm{eV}$

The correct answer is:
$-3.4 \mathrm{eV}$

Solution:
The different energy levels of an atoms are given by the equation. $E_n=-13.6 Z^2 / n^2 \mathrm{eV}$ $Z$ is the atomic number for hydrogen $=1$ $n=1,2,3$. and so on such that the ground state has $n=1$ and the secondary energy level (first excited state) has $n=2$
So, for first excited state, $n=2$
$$
E=-13.6 / 2^2=-13.6 / 4=-3.4 \mathrm{eV}
$$

Topic: Chemistry, Structure of Atom, TS EAMCET, TS EAMCET 2017
Which of the following defines the phenomenon of dedifferentiation?

Options:
A Loosing the capacity of division
B Loosing the capacity of division after regaining the same
C Regaining the capacity of division
D All of these

The correct answer is:
Regaining the capacity of division

Solution:
The living differentiated cells that have lost the capability to divide can regain the capacity of the division under certain conditions, this phenomenon is called dedifferentiation. It occurs during secondary growth when permanent cell-like parenchyma regains the power of division to form vascular cambium and cork cambium.

Topic: Biology, Plant - Growth and Development, NEET
Which of the following describes the characters of the family Fabaceae?

Options:
A pinnately compound leaf, zygomorphic flower, racemose
B reticulate venation, zygomorphic, cymose
C exstipulate, actinomorphic, synandrous
D alternate leaves, bisexual, bicarpellary

The correct answer is:
pinnately compound leaf, zygomorphic flower, racemose

Solution:
The Fabaceae family consists of the following characters:
Trees, shrubs, herbs; root with root nodules Stem: erect or climber
Leaves: alternate, pinnately compound or simple; leaf base, pulvinate; stipulate; venation reticulate.
Inflorescence: racemose
Flower: bisexual, zygomorphic
Calyx: sepals five, gamosepalous; valvate/imbricate aestivation
Corolla: petals five, polypetalous, papilionaceous, consisting of a posterior standard, two lateral wings, two anterior ones forming a keel (enclosing stamens and pistil), vexillary aestivation
Androecium: ten, diadelphous, anther dithecous
Gynoecium: ovary superior, mono carpellary, unilocular with many ovules, style single
Fruit: legume; seed: one to many, non-endospermic

Topic: Biology, Morphology of Flowering Plants, NEET
Which of the following determinants have value 'zero"?
$1.$ $\quad\left|\begin{array}{lll}41 & 1 & 5 \\ 79 & 7 & 9 \\ 29 & 5 & 3\end{array}\right|$
$2.$ $\quad\left|\begin{array}{lll}1 & a & b+c \\ 1 & b & c+a \\ 1 & c & a+b\end{array}\right|$
$3.$ $\quad\left|\begin{array}{ccc}0 & \mathrm{c} & \mathrm{b} \\ -\mathrm{c} & 0 & \mathrm{a} \\ -\mathrm{b} & -\mathrm{a} & 0\end{array}\right|$
Select the correct answer using the code given below.

Options:
A 1 and 2 only
B 2 and 3 only
C 1 and 3 only
D 1,2 and 3

The correct answer is:
1,2 and 3

Solution:
$1.$ $\left|\begin{array}{lll}41 & 1 & 5 \\ 79 & 7 & 9 \\ 29 & 5 & 3\end{array}\right|=\left|\begin{array}{ccc}40 & 1 & 5 \\ 72 & 7 & 9 \\ 24 & 5 & 3\end{array}\right| \quad C_{1} \rightarrow C_{1}-C_{2}$
$$
=8\left|\begin{array}{lll}
5 & 1 & 5 \\
9 & 7 & 9 \\
3 & 5 & 3
\end{array}\right|=0
$$
$\because$ two columns are same so value of determinant is zero.
$\begin{aligned} 2 .\left|\begin{array}{lll}1 & a & b+c \\ 1 & b & c+a \\ 1 & c & a+b\end{array}\right| &=\left|\begin{array}{lll}1 & a+b+c & b+c \\ 1 & a+b+c & c+a \\ 1 & a+b+c & a+b\end{array}\right| C_{2} \rightarrow C_{2}+C_{3} \\ &=(a+b+c)\left|\begin{array}{lll}1 & 1 & b+c \\ 1 & 1 & c+a \\ 1 & 1 & a+b\end{array}\right|=0 \end{aligned}$
$\because$ two columns are same so value of determinant is zero.
3. $\left|\begin{array}{ccc}0 & c & b \\ -c & 0 & a \\ -b & -a & 0\end{array}\right|=0$
$\because$ diagonal is zero so value of determinant is zero.

Topic: Mathematics, Determinants, NDA, NDA 2016 (Phase 1)
Which of the following does not occur between 15-28 day of menstrual cycle?

Options:
A Premenstrual phase
B Luteal phase
C Secretory phase
D Proliferative phase

The correct answer is:
Proliferative phase

Solution:
Menstrual cycle consists of changes in the ovary and the uterus simultaneously. It begins with the menstrual or bleeding phase. This represents the shedding of the endometrium of uterus and unfertilized secondary oocyte. This phase is followed by the follicular phase as follicles start developing in the ovary. At the same time the shedded endometrium starts its preparation and this is termed as proliferative phase. The mid of 28-day cycle shows the ovulatory phase that is Graffian follicle from ovary releases secondary oocyte in the oviduct. This is followed by the formation of a corpus luteum and is known as Luteal phase. The secondary oocyte in the oviduct can undergo fertilization hence the uterus prepares itself to receive the fertilized egg by forming secretory glands i.e. secretory phase is seen. As no fertilization takes place the secondary oocyte now starts travelling towards the uterus to shed along with the endometrium i.e. new menstrual cycle begins.

Topic: Biology, Human Reproduction, NEET
Which of the following does not show Tyndall effect?

Options:
A Clouds
B Milk
C Sugar solution
D Suspension

The correct answer is:
Sugar solution

Solution:
It is not a colloidal solution

Topic: Chemistry, Surface Chemistry, TS EAMCET, TS EAMCET 2022 (19 Jul Shift 1)
Which of the following event is not associated with ovulation in human female?

Options:
A Full development of Graafian follicle
B Release of secondary oocyte
C LH surge
D Decrease in estradiol

The correct answer is:
Decrease in estradiol

Solution:
Ovulatory phase/Pre-luteal/Post-follicular: During this phase, ovulation takes place. It usually occurs on the 14th day of the cycle of 28 days menstrual cycle. The mature Graafian follicle ruptures due to LH secreted by the pituitary. Due to LH surge, the Graafian follicle ruptures and releases the secondary oocyte in the abdominal cavity.

Topic: Biology, Human Reproduction, NEET, NEET 2015 (Phase 2)
Which of the following expression is correct

Options:
A ΔG=-RTlnK
B ΔG=1RT2lnK
C ΔG0=-RTlnK
D ΔG0=-1RT2lnK

The correct answer is:
ΔG0=-RTlnK

Solution:
Gibbs free energy is related to standard Gibbs free energy according to the equation.

ΔG=ΔG°+RTlnQ Where Q is Reaction quotient.

As we know at equilibrium Change in Gibbs free energy will be zero. And value of Q will be equal to the value of equilibrium constant.

Putting these values in equation

undefined

ΔGo=-RTlnK

Topic: Chemistry, Thermodynamics (C), AP EAMCET, AP EAMCET 2022 (04 Jul Shift 2)
Which of the following feature is not applicable to the organism shown in the figure?

Options:
A It belongs to class cyclostomata
B It has 5 to 16 pairs of gills
C Its body is devoid of scales
D The notochord is seen only in the larval stage

The correct answer is:
The notochord is seen only in the larval stage

Solution:
The diagram represents the class Cyclostomata. The body is elongated, eel-like with median fins and cartilaginous fin ray. The paired appendages are absent, tail is diphycercal. Skin is soft, smooth and containing unicellular mucous glands, but no scales are present. Notochord persists throughout life. Imperfect neural arches over notochord represent rudimentary vertebrae. The mouth is ventral, suctorial and circular with denticles. In lateral sac-like pouches of the pharynx, 5-16 pairs of gills are present, while gill-slits are present in 1-16 pairs. Air bladder is absent, and they are mostly poikilotherms.

Topic: Biology, Animal Kingdom, NEET
Which of the following features is not present in the phylum Arthropoda?

Options:
A Chitinous exoskeleton
B Metameric segmentation
C Parapodia
D Jointed appendages

The correct answer is:
Parapodia

Solution:
Aquatic annelids like Nereis possess lateral appendages, parapodia, which help in swimming.

Topic: Biology, Animal Kingdom, NEET, NEET 2016 (Phase 1)
Which of the following features is not present in the phylum Arthropoda?

Options:
A Chitinous exoskeleton
B Metameric segmentation
C Parapodia
D Jointed appendages

The correct answer is:
Parapodia

Solution:
Aquatic annelids like Nereis possess lateral appendages, parapodia, which help in swimming.

Topic: Biology, Animal Kingdom, NEET