datavorous/entrance-exam-dataset huggingface dataset:
Which of the following will not occur during conversion of a secondary follicle into tertiary follicle?

Options:
A Development of antrum
B Completion of meiosis - II
C Differentiation of theca
D Enlargement in size

The correct answer is:
Completion of meiosis - II

Solution:
Folliculargenesis (development of ovarian follicles) -
I. Primary follicles are converted to secondary follicles by getting surrounded by a few more layers of granulosa cells and a new theca.
II. The following changes occur in the secondary follicle after which it is immediately converted to a 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.
III. Tertiary follicle changes into the mature follicle (or Graafian follicle).

Topic: Biology, Human Reproduction, NEET
Which of the given option is incorrect about spleen?

Options:
A It is the graveyard of erythrocytes.
B It receives only oxygenated blood.
C It helps in filteration of blood.
D It is a primary lymphoid organ.

The correct answer is:
It is a primary lymphoid organ.

Solution:
Spleen helps in removal of old worn out erythrocytes hence it is called slaughter house of erythrocytes. Spleen also has a large reservoir of erythrocytes and hence is called blood bank of the body. It also acts as a filter of the blood by trapping blood-borne microorganisms. The primary lymphoid organs are bone marrow and thymus where immature lymphocytes differentiate into antigen-sensitive lymphocytes. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix.

Topic: Biology, Body Fluids and Circulation, NEET
Which of the reactions defines ΔfH° ?

Options:
A C(diamond)+O2(g)→CO2(g)
B 12H2(g)+12F2(g)→HF(g)
C N2(g)+3H2(g)→2NH3(g)
D CO(g)+12O2(g)→CO2(g)

The correct answer is:
12H2(g)+12F2(g)→HF(g)

Solution:
standard heat of formation (ΔfH°) for CO2 will be from C(graphite)+O2→CO2 as C(graphite) is the most stable form carbon.

Topic: Chemistry, Thermodynamics (C), NEET
Which of the two structures (A) and (B) given below is more stabilised by resonance? Explain.

Options:
A Structure ‘B’ and Structure ‘A’ are equally stabilised
B More information is required for making this judgement
C Structure ‘A’ is more stabilised as it does not involve charge separation.
D Structure ‘B’ is more stabilised as it does not involve charge separation.

The correct answer is:
Structure ‘B’ is more stabilised as it does not involve charge separation.

Solution:
Correct Option is : (D)
Structure ‘B’ is more stabilised as it does not involve charge separation.

Topic: Chemistry, General Organic Chemistry, NEET
Which of these carbocation will undergo favourable rearrangement?

Options:
A
B
C
D

The correct answer is:

Solution:
This carbocation can undergo rearrangement from secondary to tertiary by C-H3 shift as follows

Topic: Chemistry, General Organic Chemistry, NEET
Which of these following vehicle emission standards has been implemented throughout India since 2017?

Options:
A 4 wheelers: Bharat stage III, 3 wheelers: Bharat stage III, 2 wheelers: Bharat stage III
B 4 wheelers: Bharat stage IV, 3 wheelers: Bharat stage III, 2 wheelers: Bharat stage IV
C 4 wheelers: Bharat stage IV, 3 wheelers: Bharat stage III, 2 wheelers: Bharat stage III
D 4 wheelers: Bharat stage IV, 3 wheelers: Bharat stage IV, 2 wheelers: Bharat stage IV

The correct answer is:
4 wheelers: Bharat stage IV, 3 wheelers: Bharat stage IV, 2 wheelers: Bharat stage IV

Solution:
For all four wheelers, three wheelers and two wheelers in the India, Bharat IV emission standard has been implemented from 1st April 2017.

Topic: Biology, Environmental Issues, NEET
Which of these is correct about Petunia?

Options:
A It is a genus under the family Solanaceae and order Polymoniales
B It is a genus under the family Anacardiaceae and order Polymoniales
C It is a genus under the family Solanaceae and order Sapindales
D It is a species under the family Solanaceae and order Polymoniales

The correct answer is:
It is a genus under the family Solanaceae and order Polymoniales

Solution:
Petunias are flowering annuals that are easily grown in the garden as well as in containers. These plants are a genus in the family Solanaceae, subfamily petunioideae. Polynomials include dicotyledonous shrubs, herbs, or trees with a single superior compound ovary and a corolla with five lobes and five alternate stamens. Plant families like Solanaceae are included in the order polymoniales, due to its floral characters.

Topic: Biology, Morphology of Flowering Plants, NEET
Which of these is incorrect about oogenesis?

Options:
A Meiosis-I is an unequal division.
B Menopause occurs around 50 years of age.
C It starts at puberty.
D Polar bodies are formed.

The correct answer is:
It starts at puberty.

Solution:
The process of formation of a mature female gamete is called oogenesis which is markedly different from spermatogenesis. Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells (oogonia) are formed within each fetal ovary; no more oogonia are formed and added after birth. These cells start division and enter into prophase-I of the meiotic division and get temporarily arrested at that stage, called primary oocytes.
The primary oocyte within the tertiary follicle grows in size and completes its first meiotic division. It is an unequal division resulting in the formation of a large haploid secondary oocyte and a tiny first polar body.
In human beings, menstrual cycles ceases around 50 years of age; that is termed as menopause.

Topic: Biology, Human Reproduction, NEET
Which of these meristems help in increasing the girth of the plant?

Options:
A 1; Secondary meristem

B 1; Apical meristem

C 2; Intercalary meristem

D 3; Lateral meristem

The correct answer is:
3; Lateral meristem

Solution:
The lateral meristems or secondary meristems helps to increase the thickness or the girth of the plants due to secondary growth in plants. During the secondary growth in vascular plants, the cork cambium and the vascular cambium are formed due to the activity of the two lateral meristems.

Topic: Biology, Anatomy of Flowering Plants, NEET
Which of these plants is correctly matched with its reproductive characteristics?

(i) Sphagnum: Male sex organs called antheridium produce biflagellate antherozoids while the female sex organ called archegonium produces a single egg.

(ii) Sequoia: One of the megaspores enclosed within the megasporangium develops into a multicellular female gametophyte that bears two or more archegonia or female sex organs

(iii) Wolffia: One of the male gametes fuses with the egg cell to form a zygote while the other male gamete fuses with the diploid secondary nucleus to produce the triploid primary endosperm nucleus.

(iv) Polysiphonia: Sexual reproduction is oogamous with non-motile gametes and accompanied by complex post-fertilization developments

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

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

Solution:
Sphagnum is a bryophyte. In bryophytes, a male sex organ called antheridium produces biflagellate antherozoids while the female sex organ called archegonium produces a single egg.
Sequoia is a gymnosperm. In gymnosperms, one of the megaspores enclosed within the megasporangium develops into a multicellular female gametophyte that bears two or more archegonia or female sex organs
Wolffia is an angiosperm. Angiosperms show double fertilization in which one of the male gametes fuses with the egg cell to form a zygote while the other male gamete fuses with the diploid secondary nucleus to produce the triploid primary endosperm nucleus.
Polysiphonia is a red alga belong to Rhodophyceae. In rhodophytes, sexual reproduction is oogamous with non-motile gametes and accompanied by complex post-fertilization developments.

Topic: Biology, Plant Kingdom, NEET
Which of these secondary metabolites is an alkaloid?

Options:
A Codeine
B Anthocyanin
C Abrin
D Curcumin

The correct answer is:
Codeine

Solution:
There are certain biomolecules which do not play a direct role in the growth and development of the organisms but are produced by them. Such biomolecules are called as secondary metabolites. These include alkaloids, flavonoids, rubber, essential oils, antibiotics, coloured pigments, scents, gums, and spices among many other.

Topic: Chemistry, Biomolecules, NEET
Which of these statements about a monocot stem is false?

Options:
A The hypodermis in monocot stem is made up of sclerenchyma.
B The layer of pericycle just below the endodermis is generally absent.
C Central vascular bundles are generally smaller than the peripheral vascular bundles.
D Each vascular bundle is conjoint, closed and with endarch protoxylem.

The correct answer is:
Central vascular bundles are generally smaller than the peripheral vascular bundles.

Solution:
The monocot stem has a sclerenchymatous hypodermis, a large number of scattered vascular bundles, each surrounded by a sclerenchymatous bundle sheath and a large, conspicuous parenchymatous ground tissue. Vascular bundles are conjoint, closed (without cambium) and with endarch protoxylem. Peripheral vascular bundles are generally smaller than the centrally located ones. The phloem parenchyma is absent, and water-containing cavities are present within the vascular bundles.

Topic: Biology, Anatomy of Flowering Plants, NEET
Which of these statements about bryophytes is true?

Options:
A In bryophytes, zygote does not undergo reduction division immediately.
B Leafy members having leaf-like appendages in two rows on the stem-like structures are not observed in liverworts.
C Leafy stage of mosses develops from the primary protonema as a lateral bud.
D The sporophyte of mosses is less elaborate than that of liverworts.

The correct answer is:
In bryophytes, zygote does not undergo reduction division immediately.

Solution:
Bryophytes include both mosses and liverworts. In bryophytes the antherozoids and the egg fuse to form the zygote which does not undergo immediate reduction and produce a multicellular body called the sporophyte. Some of these sporophytes produce haploid spores meiotically and germinate to produce a gametophyte. Mosses have a leafy stage which develops as a lateral bud from the secondary protonema.

Topic: Biology, Plant Kingdom, NEET
Which of these statements are false regarding the human respiratory system?
a. The nasal chamber opens into the pharynx.
b. Trachea, bronchus and initial bronchioles are supported by complete cartilaginous rings.
c. The branching network of bronchi, bronchioles and alveoli comprises the lungs.
d. Pleural fluid increases friction on the lung surface.

Options:
A a & b
B b & c
C b & d
D Only d

The correct answer is:
b & d

Solution:
The nasal chamber opens into the pharynx, a portion of which is the common passage for food and air. The pharynx opens through the larynx region into the trachea. The larynx is a cartilaginous box which helps in sound production and hence called the soundbox. During swallowing, glottis can be covered by a thin elastic cartilaginous flap called epiglottis to prevent the entry of food into the larynx. The trachea is a straight tube extending up to the mid-thoracic cavity, which divides at the level of 5th thoracic vertebra into a right and left primary bronchi. Each bronchus undergoes repeated divisions to form the secondary and tertiary bronchi and bronchioles ending up in very thin terminal bronchioles. The tracheae, primary, secondary and tertiary bronchi, and initial bronchioles are supported by incomplete cartilaginous rings. Each terminal bronchiole gives rise to a number of very thin, irregular-walled and vascularised bag-like structures called alveoli. The branching network of bronchi, bronchioles and alveoli comprise the lungs. The lungs which are covered by a double-layered pleura, with pleural fluid between them. It reduces friction on the lung-surface.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of these symptoms is caused by the entry of sporozoites?

Options:
A Oedema (swelling) and thickening of skin and underlying tissues especially in the legs and genitals.
B Characteristic fever causing a feeling of cold, chills and rigor followed by increase in temperature and finally causing profuse sweating
C Vomiting, indigestion and diarrhea, gastrointestinal pain and discomfort
D Abscess in the liver.

The correct answer is:
Characteristic fever causing a feeling of cold, chills and rigor followed by increase in temperature and finally causing profuse sweating

Solution:
Oedema (swelling) and thickening of skin and underlying tissues especially in the legs and genitals is a symptom of filariasis. It is caused by round worm Wuchereria which is a digenetic worm (having two hosts - humans and mosquito). Sexual reproduction of filarial worm occurs in humans so for filariasis humans are primary hosts. Characteristic fever causing a feeling of cold, chills and rigor followed by increase in temperature and finally causing profuse sweating is a symptom of malaria which is caused by protozoan Plasmodium. It is a digenetic organism (having two hosts - humans and mosquito). Sexual reproduction of Plasmodium occurs in mosquito, hence mosquito is its primary host while asexual reproduction occurs in humans so humans are its secondary hosts. Vomiting, indigestion and diarrhea, gastrointestinal pain and discomfort is caused by Ascaris which is monogenetic round worm having only one host, humans. Abscess in the liver is caused by Entamoeba histolytica which is monogenetic protozoan having only one host, humans.

Topic: Biology, Human Health and Diseases, NEET
Which of these terms have been paired correctly?

Options:
A Bark - Periderm
B Cork - Phellem
C Cork cambium - Phelloderm
D Secondary cortex - Phellogen

The correct answer is:
Cork - Phellem

Solution:
The above question identifies the alternate name for the first part. Consequently, cork-phellem is the right pair because cork is also known as phellem. While bark & periderm is incorrect because bark is composed of periderm as a layer which is in turn made of cork, cork cambium is also called as phellogen and phelloderm (commonly also known as Secondary cortex.)

Topic: Biology, Anatomy of Flowering Plants, NEET
Which of these will be seen in our respiratory system?

I. The absence of cartilage in small bronchioles allows them to expand.
II. The walls of the alveoli are made of cuboidal epithelium.
III. The recoil of the elastic fibres surrounding the alveoli helps to move air out during expiration.
IV. The trachea and bronchi are supported by circles of cartilage.

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

The correct answer is:
I and III

Solution:
The tracheae, primary, secondary and tertiary bronchi are supported by incomplete cartilaginous rings. Each terminal bronchiole gives rise to a number of very thin, irregular-walled and vascularised bag-like structures called alveoli made of squamous epithelium. Alveolar walls contain elastic fibres which stretch during inspiration and recoil during expiration to help force out air. This elasticity allows alveoli to expand according to the volume of air breathed in.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which offensive smelling compound is obtained when ethyl amine is heated with chloroform and alcoholic KOH,

Options:
A A cyanide
B An isocyanide
C A secondary amine
D An acid

The correct answer is:
An isocyanide

Solution:
C2H5NH2+CHCl3EthylamineReaction+3KOH→C2H5N≡CEthylisocyanide(Unpleasantsmell)+3KCl+3H2O

Topic: Chemistry, Amines, NEET
Which one among the following is the mild oxidizing agent?

Options:
A CrO 2 Cl 2
B K 2 Cr 2 O 7
C KMnO4
D HNO3

The correct answer is:
CrO 2 Cl 2

Solution:
CrO 2 Cl 2 is mild oxidising agent.

In this compound Cr is surrounded by less electrongative Cl atom rather than oxygen so it does not produce so much positve charge on chromium in comparision to other compound containing highly electronegative O atom. So, due to relativily low value of Standard Reduction potential it act as mild oxidising agent.

KMnO 4 ,HNO 3 and K 2 Cr 2 O 7 are strong oxidising agent due to high Standard Reduction potential.

Topic: Chemistry, Redox Reactions, NEET
Which one is not correctly matched?

Options:
A Productivity - rate of biomass production
B Gross primary productivity - photoautotrophs
C Net primary productivity - available biomass for consumption
D Secondary productivity - formation of new organic matter in producer

The correct answer is:
Secondary productivity - formation of new organic matter in producer

Solution:
Carnivores are organisms which obtain nutrient by killing and eating other animals. These form the secondary consumers preceded by the herbivore in the food chain. The rate of assimilation of food energy by consumers is called secondary productivity and this energy is available to carnivores as they are the consumers.
Total production of organic matter by the producers is called gross primary productivity and the energy left after utilization by producers is termed net primary productivity.

Topic: Biology, Ecosystem, NEET
Which one is NOT correctly matched?

Options:
A Productivity - rate of biomass production
B Gross primary productivity - photoautotrophs
C Net primary productivity - available biomass for consumption
D Secondary productivity - formation of new organic matter in producer

The correct answer is:
Secondary productivity - formation of new organic matter in producer

Solution:
Gross primary production (GPP) is the rate at which an ecosystem's producers capture and store a given amount of chemical energy as biomass in a given length of time. (Definition). It is also the rate of conversion of light energy to chemical energy by producers in an ecosystem.
The rate of assimilation of food energy by consumers is called secondary productivity and this energy is available to carnivores as they are the consumers.

Topic: Biology, Ecosystem, NEET
Which one is the incorrect statement with regard to the importance of pedigree analysis?

Options:
A It confirms that DNA is the carrier of genetic information.
B It helps to understand whether the trait in question is dominant or recessive.
C It confirms that the trait is linked to one of the autosome.
D It helps to trace the inheritance of a specific trait.

The correct answer is:
It confirms that DNA is the carrier of genetic information.

Solution:
Pedigree analysis is a chart that represents a family tree, which displays the members of the family who are affected by a genetic trait. A family tree can be represented by a pedigrec chart with all the members of a family. They may be having a genetic disorder or may be carrier of the disease. In the pedigree analysis, standard symbols are used to distinguish between different family. It helps to understand whether the trait is dominant or recessive, sex linked or autosomal. It helps to trace the inheritance of a specific trait in a family.
Related Theory
Any changes in DNA sequence, e.g., mistakes during DNA replication may lead to a change in the genetic codes or chromosomal aberrations. Inheritance of altered genes causes genetic disorders in offspring. Ther genetic inheritance is governed by Mendelian genetics. Mendelian disorders mostly occur in families with a certain pattern reflecting the alteration in a single gene. Prediction of these disorders is based on family history and can be done with the help of a family tree. This process of analysis of a number of generations of a family is called the pedigree analysis. Pedigree analysis is a strong tool in human genetics which helps to predict the pattern of inheritance, even when data is limited.

Topic: Biology, Principles of Inheritance and Variation, NEET, NEET 2013 (Karnataka)
Which one is the most abundant protein in the animal world?

Options:
A Trypsin
B Haemoglobin
C Collagen
D Insulin

The correct answer is:
Collagen

Solution:
Collagen is the most abundant protein (structural protein) in the animal world while Ribulose Bisphosphate Carboxylase Oxygenase (RUBISCO) is the most abundant protein in the whole of the plant world.

Topic: Biology, Biomolecules (B), NEET, NEET 2012 (Screening)
Which one of following is correct? The three planes $2 x+3 y-z-2=0,3 x+3 y+z-4=0$ $\mathrm{x}-\mathrm{y}+2 \mathrm{z}-5=0$ intersect

Options:
A at a point
B at two points
C at three points
D in a line

The correct answer is:
in a line

Solution:
Planes always intersect in a line.

Topic: Mathematics, Three Dimensional Geometry, NDA, NDA 2007 (Phase 1)
Which one of the following amide will not undergo Hoffmann bromamide reaction :

Options:
A \( \mathrm{CH}_{3} \mathrm{CONH}_{2} \)
B \( \mathrm{CH}_{3} \mathrm{CONHCH}_{3} \)
C \( C_{6} H_{5} C O N H_{2} \)
D \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CONH}_{2} \)

The correct answer is:
\( \mathrm{CH}_{3} \mathrm{CONHCH}_{3} \)

Solution:
Only primary amides undergo Hoffmann bromamide reaction to yields primary amines.
\( R-\stackrel{\mathrm{O}}{\mathrm{C}}-\mathrm{NH}_{2}+\mathrm{Br}_{2}+4 \mathrm{~N} a \mathrm{OH}_{2} \stackrel{\mathrm{H}_{2} \mathrm{O}}{1^{\circ} \text { Amide }} \underset{1^{\circ} \text { Amide }}{\mathrm{NH}_{2}}+2 \mathrm{NaBr}+\mathrm{Na}_{2} \mathrm{CO}_{3}+2 \mathrm{H}_{2} \mathrm{O} \)
Here \( \mathrm{CH}_{3} \mathrm{CONHCH}_{3} \) is secondary amide, therefore, it does not undergo Hoffmann bromamide reaction.

Topic: Chemistry, Amines, KCET, KCET 2015
Which one of the following animals is corectly mathed with its particular named taxonomic category?

Options:
A Cuttlefish - Mollusca, a class
B Humans - Primata, the family
C Housefly - Musca, an order
D Tiger - tigris, the species

The correct answer is:
Tiger - tigris, the species

Solution:
A group of individual organisms with fundamental similarities is called species. one species is distinguished from the other closely related species on the basis of distinct morphological differences. Tiger (Panthera tigris) is one of the species of Panthera.

Topic: Biology, The Living World, NEET, NEET 2011 (Screening)
Which one of the following animals may occupy more than one trophic level in the same ecosystem at the same time?

Options:
A Sparrow
B Mice
C Goat
D Frog

The correct answer is:
Sparrow

Solution:
Sparrow is a primary consumer when it eats seeds, fruits, etc. and a secondary consumer when it eats insects and worms.

Topic: Biology, Ecosystem, NEET
Which one of the following binary numbers is the prime number?

Options:
A 111101
B 111010
C 111111
D 100011

The correct answer is:
111101

Solution:
$111101=1 \times 2^{5}+1 \times 2^{4}+1 \times 2^{3}+1 \times 2^{2}+1 \times 2^{0}$
$=32+16+8+4+1=61$
Which is a prime number.
(b) $111010=1 \times 2^{5}+1 \times 2^{4}+1 \times 2^{3}+1 \times 2^{1}$
$=32+16+8+2=58$
Which isnot a prime number.
(c) $111111=1 \times 2^{5}+1 \times 2^{4}+1 \times 2^{3}+1 \times 2^{2}+1 \times 2^{0}$
$=32+16+8+4+2+1=63$
Which is not a prime number
(d) $\quad 100011=1 \times 2^{5}+1 \times 2^{1}+1 \times 2^{0}$
Which is not a prime number Thus, option (a) is correct.

Topic: Mathematics, Sets and Relations, NDA, NDA 2007 (Phase 1)
Which one of the following can be considered as appropriate pair of values of regression coefficient of y on $\mathrm{x}$ and regression coefficient of $\mathrm{x}$ on $\mathrm{y?}$

Options:
A $(1,1)$
B $(-1,1)$
C $\left(-\frac{1}{2}, 2\right)$
D $\left(\frac{1}{3}, \frac{10}{3}\right)$

The correct answer is:
$(1,1)$

Solution:
The product of regression coefficient of $y$ on $\mathrm{X}$ and regression coefficient of $x$ on $y$ is always less than of equal to 1 . Also, the signs of both coefficients should be same. Here, $|\mathrm{x}|=1$

Topic: Mathematics, Statistics, NDA, NDA 2017 (Phase 2)
Which one of the following can be obtained from an ogive?

Options:
A Mean
B Median
C Geometric mean
D Mode

The correct answer is:
Median

Solution:
Median can be obtained from ogive.

Topic: Mathematics, Statistics, NDA, NDA 2018 (Phase 2)