datavorous/entrance-exam-dataset huggingface dataset:
Attractants and rewards are required for:

Options:
A Anemophily
B Entomophily
C Hydrophily
D Cleistogamy

The correct answer is:
Entomophily

Solution:
Insect pollinated plants provide rewards as edible pollen grain and nectar. While some plants also provide a safe place for deposition of eggs. Insect pollination is a form of pollination whereby pollen of plants, especially but not only of flowering plants, is distributed by insects. Flowers pollinated by insects typically advertise themselves with bright colours, sometimes with conspicuous patterns leading to rewards of pollen and nectar; they may also have an attractive scent which in some cases mimics insect pheromones.

Both hydrophily (water pollination) and anemophily (wind pollination) do not require rewarding flowers. Cleistogamous flowers are self-pollinated.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET, NEET 2017
Attractive force of cell walls of xylem for water molecules is termed as

Options:
A Adhesion
B Cohesion
C Osmosis
D Plasmolysis

The correct answer is:
Adhesion

Solution:
Walls of tracheids and vessels of xylem are made up of lignin and cellulose and have a strong affinity for water (adhesion).

Topic: Biology, Plant - Growth and Development, NEET
Attractive forces of cell walls for water molecules is termed as

Options:
A Adhesion
B Cohesion
C Osmosis
D Plasmolysis

The correct answer is:
Adhesion

Solution:
Cohesion is the force of attraction between two particles of the same substance (e.g. between two water molecules).
Adhesion is the force of attraction between unlike molecules, or the attraction between the surfaces of contacting bodies.
Walls of tracheids and vessels of xylem are made up of lignin and cellulose and have a strong affinity for water (adhesion).

Topic: Biology, Transport in Plants, NEET
Auto oxidation of bleaching powder gives

Options:
A only calcium chlorate
B only calcium chloride
C only calcium hypochlorite
D Both A and B

The correct answer is:
Both A and B

Solution:
Auto oxidation of bleaching powder gives calcium chlorate and calcium chloride
6CaOCl2→5CaCl2+6Ca(ClO3)2

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Autonomously replicating circular extrachromosomal DNA of a prokaryotic cell is called:

Options:
A Satellite DNA
B Plasmid
C Nucleiod
D Recombinant DNA

The correct answer is:
Plasmid

Solution:
Plasmids are defined as small circular molecules of DNA which are capable of replicating independently and do not rely on chromosomal DNA of the organism. Due to this feature, they are also referred to as extra-chromosomal DNA. They are found in bacteria, archaea and various eukaryotes. The recombinant DNA is generated by combining DNA from two or more sources. Satellite DNA is DNA sequences with small segments, repeated many times.

Topic: Biology, Biotechnology - Principles and Processes, NEET
Autoreduction process is used in the extraction of

Options:
A Cu and Hg
B Hg and Zn
C Cu and Al
D Fe and Pb

The correct answer is:
Cu and Hg

Solution:
Autoreduction is used for sulphide ore of less electropositive metals like Hg , Pb and Cu

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Auxin can be bio assayed by:

Options:
A Hydroponics
B Potometer
C Lettuce hypocotyl elongation
D Avena coleoptile curvature

The correct answer is:
Avena coleoptile curvature

Solution:
Plant growth regulators are also called phytohormones. There are two major classes of phytohormones, growth promoters and growth inhibitors. For every hormone, there is a typical bioassay, which depicts its typical activity. Avena coleoptile curvature test is the bioassay for auxins. This was shown by Went in 1928 on a decapitated coleoptile which showed the auxin-like activity.

Topic: Biology, Plant - Growth and Development, NEET, NEET 2015 (Phase 2)
Auxin increases the __________ of cell walls.

Options:
A Plasticity
B Thickness
C Porosity
D Rigidity

The correct answer is:
Plasticity

Solution:
Auxin is known to elongate the cell. It causes certain changes across the membrane such that cellulase enzyme cause loosening of the fibers of the cell wall. Loosening of fiber increase the plasticity of the cell wall.

Topic: Biology, Plant - Growth and Development, NEET
Auxin inhibits the growth of

Options:
A apical buds
B lateral axillary buds
C roots on stem cuttings
D parthenocarpic development of fruits

The correct answer is:
lateral axillary buds

Solution:
The first discovered plant growth hormone is auxin that plays an important role in the growth and development of plants. The bud which is present on the apex of the stem and root is called apical bud that produces a hormone i.e. auxin that helps in the growth of the shoot tip and root tip but inhibits the growth of the lateral bud. But if the plant is cut then auxin concentration in the plants gets decreased that lead to the development of lateral axillary bud. So the correct answer is B.

Topic: Biology, Plant - Growth and Development, NEET
Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin

Options:
A promotes abscission of mature leaves only.
B does not affect mature monocotyledonous plants.
C can help in cell division in grasses, to produce growth.
D promotes apical dominance.

The correct answer is:
does not affect mature monocotyledonous plants.

Solution:
Auxin does not affect mature monocot plants. In monocots, especially grasses show limited translocation and cause rapid degradation of external auxin.

Topic: Biology, Plant - Growth and Development, NEET, NEET 2024
Auxin was first isolated from:

Options:
A Human urine
B Human sweat
C Apical shoots of plants
D Flowers of pineapples

The correct answer is:
Human urine

Solution:
Auxins (from Greek âauxeinâ: to grow) was first isolated from human urine. The term âauxinâ is applied to the indole-3-acetic acid (IAA), and to other natural and synthetic compounds having certain growth-regulating properties. They are generally produced by the growing apices of the stems and roots, from where they migrate to the regions of their action.

Topic: Biology, Plant - Growth and Development, NEET
Auxins are known to promote ____________ in pineapples.

Options:
A flowering
B root formation
C abscission
D node elongation

The correct answer is:
flowering

Solution:
Auxins help to initiate rooting in stem cuttings, an application widely used for plant propagation. Auxins promote flowering e.g. in pineapples. They help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits.

Topic: Biology, Plant - Growth and Development, NEET
Auxospores and hormocysts are formed, respectively, by:

Options:
A some diatoms and several cyanobacteria
B some cyanobacteria and many diatoms
C several cyanobacteria and several diatoms
D several diatoms and a few cyanobacteria.

The correct answer is:
several diatoms and a few cyanobacteria.

Solution:
Auxospores are formed in diatoms and hormocysts are formed in cyanobacteria.

Topic: Biology, Biological Classification, NEET, NEET 2005
Avena coleoptile test detects the presence of

Options:
A IAA
B GA
C NAA
D BAP

The correct answer is:
IAA

Solution:
Avena curvature test carried out by F.W. Went demonstrated the effect of auxins on plant growth by performing some experiments with the oat (Avena sativa) coleoptile. IAA is the natural auxin. Auxins (Gk. auxin = to grow) are weakly acidic growth hormones having an unsaturated ring structure and capable of promoting cell elongation, especially of shoots.

Topic: Biology, Plant - Growth and Development, NEET
Average density of the earth

Options:
A does not depend on g
B is a complex function of g
C is directly proportional to g
D is inversely proportional g

The correct answer is:
is directly proportional to g

Solution:
Acceleration due to gravity g=GMR2, M=43πR3ρ
∴ g=4G3πR3R2ρ
â¹ g=4GπR3ρ ρ=average density
â¹g∝ρ or ρ∝g

Topic: Physics, Gravitation, NEET
Average oxidation number of carbon in C3O2,Mg2C3 are respectively

Options:
A -4/3, +4/3
B +4/3, -4/3
C -2/3, +2/3
D -2/3, +4/3

The correct answer is:
+4/3, -4/3

Solution:
Let the oxidation number of carbon be x then
C3O2=3x-4=0
x = 4/3
Mg2C3=2×2+3x=0
x = -3/4

Topic: Chemistry, Redox Reactions, NEET
Average oxidation state of Fe in Fe3O4 is

Options:
A 54
B 45
C 32
D 83

The correct answer is:
83

Solution:
Fe3O4→3x+4(-2)=0
x=+83

Topic: Chemistry, Redox Reactions, NEET
Average power in the LCR circuit depends upon

Options:
A current
B phase difference only
C EMF
D current, EMF and phase difference

The correct answer is:
current, EMF and phase difference

Solution:
The average power of LCR circuit is given as,
Pav=Vrms·irms·cos⁡ϕ
Hence, the average power depends upon current, EMF and phase difference.

Topic: Physics, Alternating Current, NEET
Average value of KE and PE over entire time period is

Options:
A 0,12mÂ Ï2A2
B 12mÂ Ï2A2,0
C 12mÂ Ï2A2,Â 12mÂ Ï2A2
D 14m Ï2A2,14m Ï2A2

The correct answer is:
14m Ï2A2,14m Ï2A2

Solution:
Maximum KE=12mω2A2; minimum KE=0
Average KE=0+12mω2 A22=14mω2A2
Similarly average PE =0+12mω2 A22
=14mω2A2
(average of sin 2 θ and cos 2 θ in a time period is 1 2 )

Topic: Physics, Oscillations, NEET
Average velocity of a particle executing SHM in one complete vibration is

Options:
A Aω2
B Aω
C Aω22
D zero

The correct answer is:
zero

Solution:
According to SHM after a complete vibration the net displacement of the SHM is zero so that the Vavg is zero.

Vavg=Total displacementTotal timeVavg=0t

Vavg=0

Topic: Physics, Oscillations, NEET, NEET 2019 (All India)
Axial placentation is observed in:

Options:
A China rose, Petunia, Lemon
B Mustard, Cucumber, Primrose
C China rose, Beans, Lupin
D Tomato, Dianthus, Pea

The correct answer is:
China rose, Petunia, Lemon

Solution:
Placentation is the arrangement of ovules within the ovary. Placenta is the tissue that nourish the ovules inside the ovary.

Axile placentation:

When the placenta is axial and the ovules are attached to it in a multilocular ovary, the placentaion is said to be axile, as in China rose, tomato and lemon. This is also seen in Solanaceae family (like Petunia, potato, etc.) and Liliaceae family (like onion)

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2023 (All India)
Axial skeleton is made up of

Options:
A Skull
B Sternum
C Complete vertebral column
D All of these

The correct answer is:
All of these

Solution:
The axial skeleton is present on the median longitudinal axis of the body. It consists of the skull, vertebral column, sternum and ribs.

Topic: Biology, Locomotion and Movement, NEET
Axillary buds in the given figure of Bougainvillea gets modified into ____________.

Options:
A suckers
B stolons
C tendrils
D thorns

The correct answer is:
thorns

Solution:
Bougainvillea thorn is a pointed, hard structure and is a modified stem in Bougainvillea, their axillary bud is modified into a thorn. This modification reduces the rate of transpiration and also prevents herbivore grazing.

Topic: Biology, Morphology of Flowering Plants, NEET
Axoneme having 9 + 2 doublet microtubule arrangement is found in

Options:
A cilia and flagella
B centriole
C cilia
D flagella

The correct answer is:
cilia and flagella

Solution:
Cilia and flagella are extensions that arise from the cell membrane. Flagella are longer than cilia. Both structures are responsible for cell motility. The microscopic features of these two structures are also very similar. The central core is known as axoneme. These show nine pairs of microtubules that are arranged peripherally and one pair of microtubule is also seen in the centre. This is 9+2 arrangement. The central tubules are connected to some peripheral tubules by means of a sheath.

Topic: Biology, Cell - The Unit of Life, NEET
Azidothymidine (AZT) drug is useful in the treatment of

Options:
A an RNA containing the viral borne disease
B anaphylactic shock
C autoimmune disorders
D calcium deficiency disease

The correct answer is:
an RNA containing the viral borne disease

Solution:
Azidothymidine (AZT = Zidovudine) is a drug used in anti-retroviral treatment (also known as antiretroviral therapy or ART) to treat HIV. Taking ART means that people living with HIV can live long and healthy lives. ART is not a cure for HIV, but it keeps HIV under control.

Topic: Biology, Human Health and Diseases, NEET
Azolla is used as a biofertilizer because it

Options:
A multiplies very fast to produce massive biomass.
B has an association of nitrogen-fixing Rhizobium.
C has an association of nitrogen-fixing cyanobacteria.
D has an association of mycorrhiza.

The correct answer is:
has an association of nitrogen-fixing cyanobacteria.

Solution:
The leaves of Azolla (fern) have as many as 80,000 blue-green algae belonging to Anabaena azollae, which have the capacity to fix atmospheric nitrogen and make it available to Azolla. Azolla pinnata is an excellent biofertilizer for rice. Farmers may have reported 50% increase in yield of rice by using this biofertilizer.

Topic: Biology, Microbes in Human Welfare, NEET
Azospirillum is a

Options:
A free-living, nitrogen-fixing eukaryotic microbe
B symbiotic, nitrogen-fixing eukaryotic microbe
C free-living, nitrogen-fixing prokaryotic microbe
D symbiotic, nitrogen-fixing prokaryotic microbe

The correct answer is:
free-living, nitrogen-fixing prokaryotic microbe

Solution:
Azospirillum is a gram negative bacteria that has the capacity to fix nitrogen without been in a symbiotic relationship with other organism. It is a bacterial genus from the family of Rhodospirillaceae and can be used to promote plant growth.

Topic: Biology, Mineral Nutrition, NEET
AZT (3I-azido 2I, 3I-dideoxy thymine) is used in the treatment of

Options:
A Malaria
B AIDS
C Cholera
D Kala-azar

The correct answer is:
AIDS

Solution:
One of the problems in treating AIDS is that HIV can lie undetected in body cells. In addition, HIV can infect a variety of cells, including those in the central nervous system that are protected by the blood-brain barrier. Added to this is the problem of opportunistic infections, which may be very difficult to treat. Any therapy must overcome the problem that antiviral agents may also harm host cells.
To date, four drugs with similar action are used to inhibit HIV replication and slow the progression of AIDS. All are nucleoside analogues, Substances that are similar to the naturally occurring nucleosides in RNA and DNA. They block conversion of retroviral RNA into DNA. The first and still most commonly used drug to treat AIDS is AZT (azidothymidine) or Retrovir.

Topic: Biology, Human Health and Diseases, NEET
B 2 H 6 + NH 3 âAddition compound X â 450 K Y+Z g
In the above sequence Y and Z are respectively

Options:
A Borazine, H2
B Boron, H2
C Boron nitride, H2
D Boron, Hydrazine

The correct answer is:
Borazine, H2

Solution:
Here the reaction sequence is as follows
3 B 2 H 6 +6 NH 3 →3 BH 2 ( NH 3 ) 2 BH 4 → 450 K 2 B 3 N 3 H 6 Borazine +12 H 2
Hence, Y is borazine and Z is hydrogen.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
BCl3 is a planar molecule whereas NCl3 is pyramidal because

Options:
A nitrogen atom is smaller than boron atom
B BCl3 has no lone pair but NCl3 has a lone pair of electrons on their central atoms
C B-Cl bond is more polar than N-Cl bond
D N-Cl bond is more covalent than B-Cl bond

The correct answer is:
BCl3 has no lone pair but NCl3 has a lone pair of electrons on their central atoms

Solution:
There is no lone pair on boron in BCl3 hence no repulsion takes place. There is a lone pair on nitrogen in NCl3 hence repulsion takes place. Therefore BCl3 is planar molecule but NCl3 is pyramidal molecule.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Be2+ is isoelectronic with which of the following ions?

Options:
A H+
B Li+
C Na+
D Mg2+

The correct answer is:
Li+

Solution:
Isoelectronic species are those species that have the same number of electrons.

Be2+4=1s2=2e-

Li+3= 1s2= 2e-

Topic: Chemistry, Structure of Atom, NEET, NEET 2014
Be2+ is isoelectronic with which of the following ions?

Options:
A Na+
B Li+
C Mg2+
D H+

The correct answer is:
Li+

Solution:
As Li+ and Be2+ both have 2 electrons so they are iso electronic. Rest other ions have different number of electrons than Be2+ so there is no relation between them. Na+ , Mg2+ both have 10 electrons.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
BF3 is used as a catalyst in various organic reactions because

Options:
A it is a strong reducing agent
B it is highly reactive compound
C it is a weak Lewis acid
D it is a strong Lewis acid

The correct answer is:
it is a strong Lewis acid

Solution:
it is a strong Lewis acid. As a strong Lewis acid, its catalytic properties are usedfor suchre actions as alkylation of aromatic hydrocarbons, polymerization of phenolic and epoxy resins as well as other isomerization, esterification, and condensation reactions.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
BF3 on reaction with sodium hydride produces

Options:
A B2F6
B B4H10
C B2F6
D B2H6

The correct answer is:
B2H6

Solution:
2BF3+6NaH→B2H6+6NaF

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
B has a smaller first ionization enthalpy than Be. Consider the following statements
(i) it is easier to remove 2p electron than 2s electron
(ii) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be
(iii) 2s electron has more penetration power than 2p electron
(iv) atomic radius of B is more than Be
(atomic number B = 5, Be = 4)
The correct statements are

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

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

Solution:
As radius of Boron is less than radius of Be hence IV statement is false while rest other are true statements.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
B(OH)3+NaOH→NaBO2+Na[B(OH)4]+H2O
How can this reaction is made to proceed in forward direction?

Options:
A addition of cis 1,2 diol
B addition of borax
C addition of trans 1,2 diol
D addition of Na2HPO4

The correct answer is:
addition of cis 1,2 diol

Solution:
H3BO3 acts as a weak monobasic Lewis acid
B(OH)3+NaOH→Na[B(OH)4]
On addition of cis 1, 2 diol in H3BO3 solution, acidic strength of H3BO3 increases due to chelation effect.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
B (OH) 3 +NaOH â Na[B OH ) 4
How this reaction can is made to proceed in forward direction?

Options:
A Addition of cis 1,2 diol
B Addition of borax
C Addition of trans 1,2 diol
D Addition od Na2HPO4

The correct answer is:
Addition of cis 1,2 diol

Solution:
[B(OH)4]- forms compound with cis 1,2 diol i.e. it consumes the product so according to le chatelier principle the reaction goes in forward direction.

Topic: Chemistry, Chemical Equilibrium, NEET
B Predominant ‘A’ and ‘B’ are respectively

Options:
A
B
C
D

The correct answer is:

Solution:
Bromination of phenol is solvent dependent reaction i.e. polarity of solvents.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
(b) What happens when Boric acid is added to water?

Options:
A Boric acid ionizes and releases H⁺ ions in water.
B Boric acid undergoes hydrolysis to form boric acid ions.
C Boric acid ionizes and releases OH⁻ ions in water.
D Boric acid reacts with water to form boron hydroxide.

The correct answer is:
Boric acid ionizes and releases OH⁻ ions in water.

Solution:
Correct Option is : (C)
Boric acid ionizes and releases OH⁻ ions in water.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Babanrao is an organic farmer growing ladyfingers in his field. What are the precautions he will take to control pests in his field?

I. Use of ladybird and dragonflies to control butterfly caterpillars.

II. Use of Nucleopolyhedrovirus to control arthropods.

III. Use of Bacillus thuringiensis to control butterfly caterpillars.

IV. Use of Trichoderma to control arthropods.

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

The correct answer is:
II, III

Solution:
Ladybirds and dragonflies are used to control the mosquito and aphid population.
Nucleopolyhedrovirus is used to control arthropods and insects as they attack specifically, and have narrow spectrum insecticidal applications.
Bacillus thuringiensis is used to control butterfly caterpillars.
Trichoderma is a fungus used in treatment of plant diseases.

Topic: Biology, Microbes in Human Welfare, NEET
Bacillus thuringiensis (Bt) strains have been used for designing a novel

Options:
A Bio-metallurgical technique
B Bio-mineralisation processes
C Bio-insecticidal plants
D Bio-fertilizers

The correct answer is:
Bio-insecticidal plants

Solution:
Bt strains have been used to design bio-insecticidal plants, through genetic engineering. Bacillus thuringiensis is commonly used as a biopesticide and synthesizes the proteins known as endotoxins or cry proteins. These proteins have insecticidal action. The gene for these proteins is introduced in many transgenic products that provide resistance to pests.

Topic: Biology, Biotechnology and Its Applications, NEET
Bacillus thuringiensis (Bt) strains have been used for designing novel:

Options:
A biofertilizers
B bio-metallurgical techniques
C bio-mineralization processes
D bioinsecticidal plants.

The correct answer is:
bioinsecticidal plants.

Solution:
Bacillus thuringiensis producte endotoxin (Cry proteins) during the stationary phase of its growth cycle which when ingested and released in the gut of the larvae of insect pest, disrupts the insect gut lining thereby killing earthen. In this way, it act as a bioinsecticide.
Related Theory
Scientists identify and isolate the gene that produces the lethal protein. The gene is removed from the bacterium and a gene conferring resistance to a chemical (usually antibiotic or herbicide) is attached that will prove useful in a later step. The Bt gene with the resistance gene attached is inserted into plant cells. Any plant cell that has the Bt gene must also have the resistance gene that was attached to it. The plant cells are grown in the presence of the antibiotic or herbicide and select the plant cells that are unaffected by it. These genetically transformed plant cells are then grown into whole plants by a process called tissue culture. The modified plants produce the same lethal Bt protein produced by $B$ bacteria because the plants now have the same gene.

Topic: Biology, Biotechnology and Its Applications, NEET, NEET 2005
Bacillus thuringiensis (Bt) strains have been used for designing novel

Options:
A bioinsecticidal plants
B bio-mineralization process
C biofertilizers
D bio-metallurgical techniques

The correct answer is:
bioinsecticidal plants

Solution:
Bacillus thuringiensis is a bacterium seen on plants. This is known to produce a toxin. This toxin is in an inactive form when bacteria are on the plants. If any insect harms the plant this toxin enters the insect's gut and thus gets activated due to the gut alkaline pH. This bacterium contains genes called as Cry gene and these get activated and start attacking the cells of insects thus results in their death. Thus these bacteria act as biopesticides because of this feature, this gene from the bacterium is used to provide resistant to plants.

Topic: Biology, Biotechnology and Its Applications, NEET
Bacillus thuringiensis is a bacterium of

Options:
A Dirty water
B Air borne
C Soil
D Surface of midgut

The correct answer is:
Soil

Solution:
The bacterium Bacillus thuringiensis is a common soil bacteria, which produces a protein toxin that kills certain insects. The bacteria has been commonly found in soil, water, plants, stored cereals and dead insects. The toxin is a crystal (Cry) protein. There are several kinds of cry toxin which are toxic to different groups of insects. The gene encoding Cry protein is called cry gene.

Topic: Biology, Biotechnology and Its Applications, NEET