Official NEET UG 2017

A spring of force constant k is cut into lengths of ratio 1 : 2 : 3. They are connected in series and the new force constant is k’. Then they are connected in parallel and force constant is {k}” . Then k’ : {k}” is : –

1 : 9
1 : 11
1 : 14
1 : 16

The ratio of resolving powers of an optical microscope for two wavelengths

\(\lambda _1\) =4000 \(Å\) and \(\lambda\) \(_2\) = 6000 \(Å\) is:-

9 : 4
3 : 2
16 : 81
8 : 27

The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system?

20 Hz
30 Hz
40 Hz
10 Hz

Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take ‘g’ constant with a value 10 m/s2 . The work done by the (i) gravitational force and the (ii) resistive force of air is :-

(i) 1.25 J (ii) – 8.25 J
(i) 100 J (ii) 8.75 J
(i) 10 J (ii) – 8.75 J
(i) – 10 J (ii) – 8.25 J

A physical quantity of the dimensions of length that can be formed out of c, G and \(\frac{e^{2}}{4\pi \varepsilon _{0}}\) is [c is velocity of light, G is universal constant of gravitation and e is charge] :-

\(c^{2}\left [ G\frac{e^{2}}{4\pi \varepsilon _{0}} \right ]^{\frac{1}{2}}\)
\(\frac{1}{c^{2}}\left [ \frac{e^{2}}{G4\pi \varepsilon _{0}} \right ]^{\frac{1}{2}}\)
\(\frac{1}{c}G\frac{e^{2}}{4\pi \varepsilon _{0}}\)
\(\frac{1}{c^{2}}\left [ G\frac{e^{2}}{4\pi \varepsilon _{0}} \right ]^{\frac{1}{2}}\)

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are \(K_{1}\) and \(K_{1}\). The thermal conductivity of the composite rod will be:

\(\frac{3(K_1 + K_2)}{2}\)
\(K_{1}+K_{2}\)
\(2(K_{1}+K_{2})\)
\(\frac{K_{1}+K_{2}}{2} \)

A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system :-

Decreases by a factor of 2
Remains the same
Increases by a factor of 2
Increases by a factor of 4

In a common emitter transistor amplifier the audio signal voltage across the collector is 3V. The resistance of collector is \(3k\Omega \). If current gain is 100 and the base resistance is \(2k\Omega \), the voltage and power gain of the amplifier is :-

15 and 200
150 and 15000
20 and 2000
200 and 1000

Thermodynamic processes are indicated in the following diagram

Match the following

Sort elements

Isochoric
Adiabatic
Isothermal
Isobaric

P. Process I
Q. Process II
R. Process III
S. Process IV

Suppose the charge of a proton and an electron differ slightly. One of them is – e, the other is \((e+\Delta e)\). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then \(\Delta e\) is of the order of [Given mass of hydrogen\( m_{h}=1.67\times 10^{-27}kg]\)

\( 10_{23}C\)
\( 10_{37}C \)
\( 10_{47}C \)
\( 10_{20}C \)

The resistance of a wire is ‘R’ ohm. If it is melted and stretched to ‘n’ times its original length, its new resistance will be :-

\(\frac{R}{n}\)
n\(^2\)R
\(\frac{R}{n^2}\)
nR

The given electrical network is equivalent to :

OR gate
NOR gate
NOT gate
AND gate

The de-Broglie wavelength of a neutron in therma lequilibrium with heavy water at a temperature T (Kelvin) and mass m, is:-

\(\frac{h}{\sqrt{3mkT}}\)
\(\frac{2h}{\sqrt{3mkT}}\)
\(\frac{2h}{\sqrt{mkT}}\)
\(\frac{h}{\sqrt{mkT}}\)

Which one of the following represents forward bias diode ?

1
2
3
4

A long solenoid of diameter 0.1 m has 2 × 10\(^{4}\) turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to 0A from 4 A in 0.05 s. If the resistance of the coil is 10\(\pi ^{2}\Omega \). the total charge flowing through the coil during this time is:-

\( 16\mu C\)
\(32\mu C\)
\(16\pi \mu C\)
\(32\pi \mu C\)

Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time \(t_{1}\) . On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time \(t_{2}\). The time taken by her to walk up on the moving escalator will be

\(\frac{t_{1}t_{2}}{t_{2}-t_{1}}\)
\(\frac{t_{1}t_{2}}{t_{2}+t_{1}}\)
\(t_{1}-t_{2}\)
\(\frac{t_{1}+t_{2}}{2}\)

Young’s double slit experiment is first performed in air and then in a medium other than air. It is found that 8\(^{th}\) bright fringe in the medium lies where 5\(^{th}\) dark fringe lies in air. The refractive index of the medium is nearly :-

1.59
1.69
1.78
1.25

A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source I. When the mirror is rotated through a small angle q, the spot of the light is found to move through a distance y on the scale. The angle \(\theta \) is given by :-

\( \frac{y}{x}\)
\(\frac{x}{2y}\)
\(\frac{x}{y}\)
\(\frac{y}{2x} \)

If \(\theta _1\) and \(\theta _2\) be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip \(\theta\) is given by

\(tan^{2}\theta =tan^{2}\theta _{1}+tan^{2}\theta _{2}\)
\(cot^{2}\theta =cot^{2}\theta _{1}-cot^{2}\theta _{2}\)
\(tan^{2}\theta =tan^{2}\theta _{1}-tan^{2}\theta _{2}\)
\(cot^{2}\theta =cot^{2}\theta _{1}+cot^{2}\theta _{2}\)

Tow cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s] :-

361 Hz
411 Hz
448 Hz
350 Hz

Two blocks A and B of masses 3 m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively :

\(\frac{g}{3},g \)
g,g
\(\frac{g}{3},\frac{g}{3}\)
\(g \frac{g}{3} \)

A thin prism having refracting angle 10° is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be :-

6°
8°
10°
4°

The acceleration due to gravity at a height 1 km above the earth is the same as at a depth d below the surface of earth. Then :-

d = 1 k
\( d = \frac{3}{2}km\)
d = 2 km
\(d = \frac{1}{2} km\)

A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves :-

Potential gradient
A condition of no current flow through the galvanometer
A combination of cells, galvanometer andresistances
Cells

A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be :-

450
1000
1800
225

Figure shows a circuit that contains three identical resistors with resistance R = 9.0 \( \Omega \) each, two identical inductors with inductance L = 2.0 mH each, and an ideal battery with emf \(\varepsilon\) = 18 V. The current ‘i’ through the battery just after the switch closed is,…… :-

0.2 A
2 A
0 ampere
2 mA

Radioactive material ‘A’ has decay constant \( ‘8\lambda’\)and material ‘B’ has decay constant \( ‘\lambda’\). Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material ‘B’ to that ‘A’ will be\( \frac{1}{e}\)

\( \frac{1}{7\lambda }\)
\(\frac{1}{8\lambda }\)
\(\frac{1}{9\lambda }\)
\(\frac{1}{\lambda }\)

The diagrams below show regions of equipotentials:-

A positive charge is moved from A to B in each diagram.

In all the four cases the work done is the same
Minimum work is required to move q in figure (a)
Maximum work is required to move q in figure (b)
Maximum work is required to move q in figure (c)

Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will :-

Move towards each other
Move away from each other
Will become stationary
Keep floating at the same distance between them

The x and y coordinates of the particle at any time are x = 5t – 2t\(^{2}\) and y = 10t respectively, where x and y are in meters and t in seconds. The acceleration of the particle at t = 2s is :

5 m/s\(^2\)
– 4 m/s\(^2\)
– 8 m/s[latex]^2[/latex]
0

One end of string of length l is connected to a particle of mass ‘m’ and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed ‘v’ the net force on the particle (directed towards centre) will be (T represents the tension in the string) :-

\(T+\frac{mv^{2}}{l}\)
\( T- \frac{mv^{2}}{l}\)
Zero
T

A particle executes linear simple harmonic motion with an amplitude of 3 cm. When the particle is at 2 cm from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is :-

\(\frac{\sqrt{5}}{2{\pi }}\)
\(\frac{4\pi }{\sqrt{5}}\)
\(\frac{2\pi }{\sqrt{3}}\)
\(\frac{\sqrt{5}}{{\pi }}\)

Two Polaroids P\(_{1}\) andP\(_{2}\) are placed with their axis perpendicular to each other.Unpolarised light\( I_{0}\) is incident on \(P_{1}\). A third polaroid \( P_{3} \) is kept in between \(P_{1}\) and \(P_{2} \) such that its axis makes an angle 45° with
that of P\(_{1}\) . The intensity of transmitted light through P\(_{2}\) is :-

\(\frac{I_{0}}{4}\)
\(\frac{I_{0}}{8}\)
\(\frac{I_{0}}{16}\)
\(\frac{I_{0}}{2}\)

The bulk modulus of a spherical object is ‘B’. If it is subjected to uniform pressure ‘p’, the fractional decrease in radius is :-

\(\frac{B}{3{p}}\)
\(\frac{3p}{B}\)
\(\frac{p}{3B}\)
\(\frac{p}{B}\)

In an electromagnetic wave in free space the root mean square value of the electric field is \(E_{rms}\) = 6V/m. The peak value of the magnetic field is :-

\(2.83 × 10^{-8} T\)
\(0.70 × 10^{-8} T\)
\( 4.23 × 10^{-8} T\)
\(1.41 × 10^{-8} T\)

A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm. What is the angular acceleration of the cylinder if the rope is pulled with a force of 30 N ?

0.25 rad/s\(^2\)
25 rad/s\(^2\)
5 m/s\(^2\)
25 m/s\(^2\)

Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities \(\omega _{1}\) and \(\omega _{2}\) . They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is:-

\(\frac{1}{4}I (\omega_1 – \omega_2)^2\)
\(I (\omega_1 – \omega_2)^2\)
\(\frac{1}{8}I (\omega_1 – \omega_2)^2\)
\(\frac{1}{4}I (\omega_1 + \omega_2)^2\)

The photoelectric threshold wavelength of silver is 3250 × 10\(^{-10}\)m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 × 10\(^{-10}\) m is :-

(Given) h = 4.14 × 10\(^{-15}\) eVs and c = 3 × 10\(^{8}\) ms\(^{-1}\)

\( \approx 0.6 × 10^{6} ms^{-1}\)
\( \approx 61 × 10^{3} ms^{-1}\)
\(\approx 0.3 × 10^{6} ms^{-1}\)
\(\approx 6 × 10^{5} ms^{-1}\)

A 250-Turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 µA and subjected to magnetic field of strength 0.85 T. Work done for rotating the coil by 180º against the torque is:-

4.55 µJ
2.3 µJ
1.15 µ J
9.1 µ J

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is :-

1
4
0.4
2

A carnot engine having an efficiency of\( (\frac{1}{10})\). as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is :-

90 J
99 J
100 J
1 J

A gas mixture consists of 2 moles of O\(_{2}\) and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is :-

15 RT
9 RT
11 RT
4 RT

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current ‘I along the same direction is shown in fig. Magnitude of force per unit length on the middle wire ‘B’ is given by :-

\(\frac{2\mu_{0}i^{2}}{\pi d}\)
\(\frac{\sqrt{2}\mu_{0}i^{2}}{\pi d}\)
\(\frac{\mu_{0}i^{2}}{\sqrt{2}\pi d}\)
[latex]\frac{\mu_{0}i^{2}}{{2}\pi d}[/latex]

A U tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil is :-

\( 425 kg m^{-3}\)
\(800 kg m^{-3}\)
\( 928 kg m^{-3}\)
\( 650 kg m^{-3}\)

Which of the following statements are correct ?

(a) Centre of mass of a body always coincides with the centre of gravity of the body

(b) Central of mass of a body is the point at which the total gravitational torque on the body is zero

(c) A couple on a body produce both translational and rotation motion in a body

(d) Mechanical advantage greater than one means that small effort can be used to lift a large load

(a) and (b)
(b) and (c)
(c) and (d)
(b) and (d)

Which one of the following statements is correct, with reference to enzymes ?

Holoenzyme = Apoenzyme + Coenzyme
Coenzyme = Apoenzyme + Holoenzyme
Holoenzyme = Coenzyme + Co-factor
Apoenzyme = Holoenzyme + Coenzyme

A decrease in blood pressure / volume will not cause the release of :

Atrial natriuretic factor
Aldosterone
ADH
Renin

Which cells of “Crypts of Lieberkuhn” secrete antibacterial lysozyme ?

Paneth cells
Zymogen cells
Kupffer cells
Argentaffin cells

Which of the following are not polymeric ?

Proteins
Polysaccharides
Lipids
Nucleic acids

Functional megaspore in an angiosperm develops into ?

Endosperm
Embryo sac
Embryo
Ovule

Myelin sheath is produced by :

Astrocytes and Schwann cells
Oligodendrocytes and Osteoclasts
Osteoclasts and Astrocytes
Schwann cells and Oligodendrocytes

Attractants and rewards are required for :

Entomophily
Hydrophily
Cleistogamy
Anemophily

Receptor sites for neurotransmitters are present on :

Pre-synaptic membrane
Tips of axons
Post-synaptic membrane
Membrane of synaptic vesicles

Coconut fruit is a :

Berry
Nut
Capsule
Drupe

Adult human RBCs are enucleated. Which of the following statement(s) is/are most appropriate explanation for this feature ?

(a) They do not need to reproduce
(b) They are somatic cells
(c) They do not metabolize
(d) All their internal space is available for oxygen transport

only (a)
(a), (c) and (d)
(b) and (c)
only (d)

Capacitation occurs in :

Epididymis
Vas deferens
Female reproductive tract
Rete testis

Which of the following are found in extreme saline conditions ?

Eubacteria
Cyanobacteria
Mycobacteria
Archaebacteria

Asymptote in a logistic growth curve is obtained when :

K = N
K > N
K < N
The value of 'r' approaches zero

Artificial selection to obtain cows yielding higher milk output represents :

Directional as it pushes the mean of the character in one direction
Disruptive as it splits the population into two, one yielding higher output and the other lower output
Stabilizing followed by disruptive as it stabilizes the population to produce higher yielding cows
Stabilizing selection as it stabilizes this character in the population

Select the mismatch :

Rhodospirillum – Mycorrhiza
Anabaena – Nitrogen fixer
Rhizobium – Alfalfa
Frankia – Alnus

Good vision depends on adequate intake of carotene rich food :
Select the best option from the following statements :

(a) Vitamin A derivatives are formed from carotene
(b) The photopigments are embedded in the membrane discs of the inner segment
(c) Retinal is a derivative of Vitamin A
(d) Retinal is a light absorbing part of all the visual photopigments

(a), (c) and (d)
(a) and (c)
(b), (c) and (d)
(a) and (b)

The DNA fragments separated on an agarose gel can be visualised after staining with :

Acetocarmine
Aniline blue
Ethidium bromide
Bromophenol blue

The hepatic portal vein drains blood to liver from :

Stomach
Kidneys
Intestine
Heart

The vascular cambium normally gives rise to :

Primary phloem
Secondary xylem
Periderm
Phelloderm

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement :

Both are due to a quantitative defect in globin chain synthesis
Thalassemia is due to less synthesis of globinmolecules
Sickel cell anemia is due to a quantitative problem of globin molecules
Both are due to a qualitative defect in globin chain synthesis

The genotypes of a husband and Wife are I\(^A\) I\(^B\) and \(^A\)i Among the blood types of their children, how many different genotypes and phenotypes are possible?

3 genotypes ; 4 phenotypes
4 genotypes ; 3 phenotypes
4 genotypes ; 4 phenotypes
3 genotypes ; 3 phenotypes

Which of the following facilitates opening of stomatal aperture ?

Decrease in turgidity of guard cells
Radial orientation of cellulose microfibrils in the cell wall of guard cells
Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells
Contraction of outer wall of guard cells

In Bougainvillea thorns are the modifications of :

Adventitious root
Stem
Leaf
Stipules

Which one of the following is related to Ex-situ conservation of threatened animals and plants ?

Biodiversity hot spots
Amazon rainforest
Himalayan region
Wildlife safari parks

Root hairs develop from the region of :

Elongation
root cap
Meristematic activity
Maturation

A disease caused by an autosomal primary non- disjunction is :

Klinefelter's Syndrome
Turner's Syndrome
Sickel Cell Anemia
Down's Syndrome

The water potential of pure water is :

Less than zero
More than zero but less than one
More than one
Zero

Which of the following options gives the correct sequence of events during mitosis ?

Condensation \(\to \) nuclear membrane disassembly \(\to \) arrangement at equator \(\to \) centromere division \(\to \) segregation \(\to \) telophase
Condensation \(\to \) crossing over \(\to \) nuclear membrane disassembly \(\to \) segregation \(\to \) telophase
Condensation\(\to \) arrangement at equator \(\to \) centromere division \(\to \) segregation \(\to \) telophase
Condensation \(\to \) nuclear membrane disassembly \(\to \) crossing over \(\to \) segregation \(\to \) telophase

The process of separation and purification of expressed protein before marketing is called :

Downstream processing
Bioprocessing
Postproduction processing
Upstream processing

A temporary endocrine gland in the human body is :

Corpus cardiacum
corpus luteum
Corpus allatum
Pineal gland

Which of the following is made up of dead cells?

Collenchyma
Phellem
Phloem
Xylem parenchyma

An example of colonial alga is :

Volvox
Ulothrix
Spirogyra
Chlorella

Match the following sexually transmitted diseases (Column-I) with their causative agent (Column-II) and select the correct option :

Sort elements

Neisseria
Treponema
Human papilloma-Virus
HIV

Gonorrhea
Syphilis
Genital Warts
AIDS

The function of copper ions in copper releasing IUD’s is :

They inhibit gametogenesis
They make uterus unsuitable for implantation
They inhibt ovulation
The suppress sperm motility and fertilising capacity of sperms

Which of the following in sewage treatment removes suspended solids ?

Secondary treatment
Primary treatment
Sludge treatment
Tertiary treatment

An important characteristic that Hemichordates share with Chordates is

Ventral tubular nerve cord
Pharynx with gill slits
Pharynx without gill slits
Absence of notochord

The final proof for DNA as the genetic material came from the experiments of :

Hershey and Chase
Avery, Mcleod and McCarty
Hargobind Khorana
Griffith

Among the following characters, which one was not considered by Mendel in his experiments on pea ?

Trichomes – Glandular or non-glandular
Seed – Green or Yellow
Pod – Inflated or Constricted
Stem – Tall or Dwarf

Plants which produce characteristic pneumatophores and show vivipary belong to :

Halophytes
Psammophytes
Hydrophytes
Mesophytes

The pivot joint between atlas and axis is a type of :

Cartilaginous joint
Synovial joint
Saddle joint
Fibrous joint

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?

Increasing atmospheric CO\(_2\) concentration up to 0.05% can enhance CO2 fixation rate
C\(_3\) plants respond to higher temperatures with enhanced photosynthesis while C\(_4\) plants have much lower temperature optimum
Tomato is a greenhouse crop which can be grown in CO\(_2\) – enriched atmosphere for higher yield
Light saturation for CO\(_2\) fixation occurs at 10% of full sunlight

DNA fragments are:

Negatively charged
Neutral
Either positively or negatively charged depending on their size
Positively charged

Which of the following components provides sticky character to the bacterial cell ?

Nuclear membrane
Plasma membrane
Glycocalyx
Cell wall

Which of the following options best represents the enzyme composition of pancreatic juice ?

amylase, pepsin, trypsinogen, maltase
peptidase, amylase, pepsin, rennin
lipase, amylase, trypsinogen, procarboxypeptidase
amylase, peptidase, trypsinogen, rennin

Which among these is the correct combination of aquatic mammals ?

Dolphins, Seals, Trygon
Whales, Dolphins, Seals
Trygon, Whales, Seals
Seals, Dolphins, Sharks

Fruit and leaf drop at early stages can be prevented by the application of:

Ethylene
Auxins
Gibberellic acid
Cytokinins

Select the correct route for the passage of sperms in male frogs:

Testes \(\to \) Vasa efferentia \(\to \) Kidney \(\to \) Seminal Vesicle \(\to \) Urinogenital duct \(\to \) Cloaca
Testes \(\to \) Vasa efferentia \(\to \) Bidder’s canal \(\to \) Ureter \(\to \) Cloaca
Testes \(\to \) Vasa efferentia \(\to \) Kidney \(\to \) Bidder’s canal \(\to \) Urinogenital duct \(\to \) Cloaca
Testes \(\to \) Bidder’s canal \(\to \) Kidney \(\to \) Vasa efferentia \(\to \) Urinogenital duct \(\to \) Cloaca

In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation ?

Gamete intracytoplasmic fallopian transfer
Artificial Insemination
Intracytoplasmic sperm injection
Intrauterine transfer

Which ecosystem has the maximum biomass ?

Grassland ecosystem
Pond ecosystem
Lake ecosystem
Forest ecosystem

Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:

Inspiratory Reserve Volume
Tidal Volume
Expiratory Reserve Volume
Residual Volume

Presence of plants arranged into well defined vertical layers depending on their height can be seen best in:

Tropical Rain Forest
Grassland
Temperate Forest
Tropical Savannah

Which of the following statements is correct ?

The descending limb of loop of Henle is impermeable to water.
The ascending limb of loop of Henle is permeable to water.
The descending limb of loop of Henle is permeable to electrolytes.
The ascending limb of loop of Henle is impermeable to water.

Alexander Von Humbolt described for the first time:

Laws of limiting factor
Species area relationships
Population Growth equation
Ecological Biodiversity

Zygotic meiosis is characteristic of;

Fucus
Funaria
Chlamydomonas
Marchantia

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ?

11
33
333
1

Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by:

Bee
Wind
Bat
Water

Transplantation of tissues/organs fails often due to non-acceptance by the patient’s body. Which type of immune-response is responsible for such rejections ?

Cell – mediated immune response
Hormonal immune response
Physiological immune response
Autoimmune response

Life cycle of Ectocarpus and Fucus respectively are:

Diplontic, Haplodiplontic
Haplodiplontic, Diplontic
Haplodiplontic, Haplontic
Haplontic, Diplontic

A gene whose expression helps to identify transformed cell is known as :

Vector
Plasmid
Structural gene
Selectable marker

A dioecious flowering plant prevents both :

Autogamy and geitonogamy
Geitonogamy and xenogamy
Cleistogamy and xenogamy
Autogamy and xenogamy

Which statement is wrong for Krebs’ cycle ?

There is one point in the cycle where FAD\(^+\) is reduced to FADH\(^2\)
During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised
The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid
There are three points in the cycle where NAD\(^+\) is reduced to NADH+ H\(^+\)

Phosphoenol pyruvate (PEP) is the primary CO\(_2\) acceptor in:

C\(_4\) plants
C\(_2\) plants
C\(_3\) and C\(_4\) plants
C3 plants

During DNA replication, Okazaki fragments are used to elongate:

The lagging strand towards replication fork.
The leading strand away from replication fork.
The lagging strand away from the replication fork.
The leading strand towards replication fork.

Which of the following RNAs should be most abundant in animal cell ?

t-RNA
m-RNA
mi-RNA
r-RNA

GnRH, a hypothalamic hormone, needed in reproduction, acts on:

anterior pituitary gland and stimulates secretion of LH and FSH.
posterior pituitary gland and stimulates secretion of oxytocin and FSH.
posterior pituitary gland and stimulates secretion of LH and relaxin.
anterior pituitary gland and stimulates secretion of LH and oxytocin.