Choose the correct statement.

Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

Phytochrome is a

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because

The partial pressure of oxygen in the alveoli of the lungs is

Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body.

Serum differs from blood in

The part of nephron involved in active reabsorption of sodium is

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

Osteoporosis, an age-related disease of skeletal system, may occur due to

Oxidative phosphorylation is

Graves' disease is caused due to

Name a peptide hormone which acts mainly on hepatocytes, adipocytes and enhances cellular glucose uptake and utilisation.

The posterior pituitary gland is not a 'true' endocrine gland because

In majority of angiosperms

Pollination in water hyacinth and water lily is brought about by the agency of

The ovule of an angiosperm is technically equivalent to

Which of the following depicts the correct pathway of transport of sperms?

How many plants among Indigofera., Sesbania, Salvia, Allium, Aloe, mustard, groundnut, radish, gram and turnip have stamens with different lengths in their flowers?

Match column I with column II for housefly classification and select the correct option using the codes given below.

Column $${\rm I}$$			Column $${\rm I}$$$${\rm I}$$
(A)	Family		(i)	Diptera
(B)	Order		(ii)	Arthropoda
(C)	Class		(iii)	Muscidae
(D)	Phylum		(iv)	Insecta

Study the four statements (A-D) given below and select the two correct ones out of them.
A.  Definition of biological species was given by Ernst Mayr.
B.  Photoperiod does not affect reproduction in plants.
C.  Binomial nomenclature system was given by R.H. Whittaker.
D.  In unicellular organisms, reproduction is synonymous with growth.

The two correct statements are

Which one of the following is wrong for fungi?

Select the wrong statement.

Methanogens belong to

Conifers are adapted to tolerate extreme environmental conditions because of

Which one of the following statements is wrong?

Choose the correct statement

The term 'polyadelphous' is related to

Free-central placentation is found in

Match column I with column II and select the correct option using the codes given below.

Column I		Column II
(A)	Mons pubis	(i)	Embryo formation
(B)	Antrum	(ii)	Sperm
(C)	Trophectoderm	(iii)	Female external genitalia
(D)	Nebenkern	(iv)	Graafian follicle

Radial symmetry is found in the flowers of

A non-proteinaceous enzyme is

Which of the following is the least likely to be involved in stablishing the three-dimensional folding of most proteins?

Which of the following describes the given graph correctly?

During cell growth, DNA synthesis takes place on

When cell has stalled DNA replication fork, which checkpoint should be predominantly activated?

Match the stages of meiosis in column I to their characteristic features in column II and select the correct option using the codes given below.

Column $${\rm I}$$		Column $${\rm I}$$$${\rm I}$$
A.	Pachytene	(i)	Pairing of homologous chromosomes
B.	Metaphase $${\rm I}$$	(ii)	Terminalisation of chiasmata
C.	Diakinesis	(iii)	Crossing-over takes place
D.	Zygotene	(iv)	Chromosomes align at equatorial plate

The process which makes major difference between C₃ and C₄ plants is

Red List contains data or information on

A foreign DNA and plasmid cut by the same restriction endonuclease can be joined to form a recombinant plasmid using

Which of the following is not a component of downstream processing ?

Which of the following restriction enzymes produces blunt ends ?

Which kind of therapy was given in 1990 to a four-year-old girl with adenosine deaminase [ADA] deficiency ?

Which of the following is correct for r-selected species ?

If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to

The principle of competitive exclusion was stated by

The primary producers of the deep-sea hydrothermal vent ecosystem are

How many hot spots of biodiversity in the world have been identified till date by Norman Myers ?

Which of the following is correctly matched ?

Which of the following National Parks is home to the famous musk deer or hangul ?

Stirred-tank bioreactors have been designed for -

The balloon-shaped structures called tyloses

Cortex is the region found between -

In male cockroaches, sperms are stored in which part of the reproductive system ?

Smooth muscles are

Select the wrong statement-

A cell organelle containing hydrolytic enzymes is

Select the mismatch.

DNA-dependent RNA polymerase catalyzes transcription on one strand of the DNA which is called the

Several hormones like hCG, hPL, estrogen, progesterone are produced by

Which of the following is hormone releasing IUD ?

Which of the following is incorrect regarding vasectomy ?

Embryo with more than 16 blastgomeres formed due to in vitro fertilization is transferred into

The mechanism that causes a gene to move from one linkage group to another is called

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is

Taylor conducted the experiments to prove semiconservative mode of chromosome replication on

The equivalent of a structural gene is -

Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria ?

A molecule that can act as a genetic material must fulfill the traits given below, except

The label of a herbarium sheet does not carry information on

Genetic drift operates in

In Hardy-Weinberg equation, the frequency of heterozygous individual is represented by

The chronological order of human evolution from early to the recent is

Which of the following is the correct sequence of events in the origin of life ?
I. Formation of protobionts
II. Synthesis of organic monomers
III. Synthesis of organic polymers
IV. Formation of DNA-based genetic systems

Which of the following sets of diseases is caused by bacteria ?

Which of the following is correct regarding AIDS causative agent HIV ?

Match Column-I with Column-II and select the correct option using the codes given below –

Column I	Column II
(a) Pistils fused together	(i) Gametogenesis
(b) Formation of gametes	(ii) Pistillate
(c) Hyphae of higher Ascomycetes	(iii) Syncarpous
(d) Unisexual female flower	(iv) Dikaryotic

Suppose the elements X and Y combine to form two compounds XY₂ and X₃Y₂. When 0.1 mole of XY₂ weights 10 g and 0.05 mole of X₃Y₂ weighs 9 g, the atomic weights of X and Y are

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

The correct order of strengths of the carboxylic acids

is

The correct structure of the product 'A' formed in the reaction

Which one of the following nitro-compounds does not react with nitrous acid?

A given nitrogen-containing aromatic compound 'A' reacts with Sn/HCl, followed by HNO₂ to give instable compound 'B'. 'B', on treatment with phenol, forms a beautiful coloured compound 'C' with the molecular formula C₁₂H₁₀N₂O. The structure of compound 'A' is

The central dogma of molecular genetics states that the genetic information flows from

The correct corresponding order of names of four aldoses with configuration given below

respectively, is

Which one of the following is incorrect for ideal solution?

The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

The molar conductivity of a 0.5 mol/dm³ solution of AgNO₃ with electrolytic conductivity of 5.76 $$ \times $$ 10^$$-$$3 S cm^$$-$$1 at 298 K is

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 $$ \times $$ 10^$$-$$19C)

During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is

If the E^o_cell for a given reaction has a negative value, which of the following gives the correct relationships for the values of $$\Delta $$G^o and K_eq ?

The decomposition of phosphine (PH₃) on tungsten at low pressure is a first-order reaction. It is because the

Boric acid is an acid because its molecule

AlF₃ is soluble in HF only in presence of KF. It is due to the formation of

Which one of the following statements related to lanthanoids is incorrect?

Jahn-Teller effect is not observed in high spin complexes of

The correct increasing order of trans-effect of the following species is

The solubility of AgCl_(s) with solubility product 1.6 $$ \times $$ 10^$$-$$10 in 0.1 M NaCl solution would be

How many electrons can fit in the orbital for which n = 3 and $$l$$ = 1?

Which of the following pairs of d-orbitals will have electron density along the axes ?

Which one of the following compounds shows the presence of intramolecular hydrogen bond?

The hybridizations of atomic orbitals of nitrogen in NO$$_2^ + $$, NO$$_3^ - $$  and  NH$$_4^ + $$  respectively are

Which of the following pairs of ions is isoelectronic and isostructural ?

The correct geometry and hybridization for XeF₄ are

Among the following, which one is a wrong statement ?

For a sample of perfect gas when its pressure is changed isothermally from p_i to p_f, the entropy change is given by

The percentage of pyridine (C₅H₅N) that forms pyridinium ion (C₅H₅N⁺H) ina 0.10 M aqueous pyridine solution (K_b for C₅H₅N = 1.7 $$ \times $$ 10^$$-$$9) is

Which of the following fluro-compounds is most likely to behave as a Lewis base ?

Which among the given molecules can exhibit tautomerism?

In which of the following molecules, all atoms are coplanar?

Which of the following can be used as the halide component for Friedel-Crafts reaction?

In pyrrole the electron density is maximum on

Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction ?

In the given reaction,


the product P is

The compound that will react most readily with gaseous bromine has the formula

Consider the reaction,
CH₃CH₂CH₂Br + NaCN $$ \to $$ CH₃CH₂CH₂CN + NaBr

This reaction will be the fastest in

Hot concentrated sulphate acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?

The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio $${{{I_{max}} - {I_{\min }}} \over {{I_{max}} + {I_{min}}}}$$ will be

A parallel-plate capacitor of area a, plate separation d and capacitance C is filled with four dielectric materials having dielectric constants k₁, k₂, k₃ and k₄ as shown in the figure. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant k is given by

The potential difference (V_A $$-$$ V_B) between the points A and B in the given figure is

A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be

An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57 $$ \times $$ 10^-2 T. If the value of e/m is 1.76 $$ \times $$ 10¹¹ C kg^$$-$$1, the frequency of revoluation of the electron is

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60^o is W. Now the torque required to keep the magnet in this new position is

Which of the following combinations should be selected for better tuning of an L-C-R circuit used for combination ?

A uniform magnetic field is restricted within a region of rafius r. The magnetic field changes with time at a rate $${{d\overrightarrow B } \over {dt}}$$. Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside the region of magnetic field as shown in the figure. Then the e.m.f. generated is

The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is

A 100 $$\Omega $$ resistance and a capacitor of 100 $$\Omega $$ reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is

Two identical glass ($$\mu $$_g = 3/2) equiconvex lenses of focal length $$f$$ each are kept in contact. The space between the two lenses is filled with water $$\left( {{\mu _w} = 4/3} \right)$$. The focal length of the combination is

An electric dipole is placed at an angle of 30^o with an electric field intensity 2 $$ \times $$ 10⁵ N C^$$-$$1. It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is

An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is

A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aparture is illuminated normally by a parallel beam of wavelength 5 $$ \times $$ 10^$$-$$5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is

A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes . In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use. will be

Photons with energy 5 eV are incifent on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is

Electrons of mass m with de-Broglie wavelength $$\lambda $$ fall on the target in an X-ray tube. The cutoff wavelength ($$\lambda $$₀) of the emitted X-ray is

If an electron in a hydrogen atom jumps from the 3^rd orbit to the 2^nd orbit, it emits a photon of wavelength $$\lambda $$. When it jumps from the 4^th orbit to the 3^rd orbit, the corresponding wavelength of the photon will be

The given circuit has two ideal diodes connected as shown in the figure. The current flowing through the resistance R₁ will be

What is the output Y in the following circuit, when all the three inputs A, B, C are first 0 and then 1 ?

Starting from the centre of the earth having radius R, the variation of g (acceleration due to gravity) is shown by

Two cars P and Q start from a point at the same time in a straight line and their positions are represented by
x_P(t) = (at + bt²) and x_Q(t) = (ft $$-$$ t²).

At what time do the cars have the same velocity ?

In the given figure, a = 15 m s^$$-$$2 represents the total acceleration of particle moving in the clockwise direction in a circle of radius R = 2.5 m at a given instant of time. The speed of the particle is

A rigid ball of mass m strikes a rigid wall at 60^o and gets reflected without loss of speed as shown in the figure. The value of impulse imparted by the wall on the ball will be :

Two identical balls A and B having velocities of 0.5 m s^$$-$$1 and $$-$$0.3 m s^$$-$$1 respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be :

A bullet of mass 10 g moving horizontally with a velocity of 400 m s^$$-$$1 strikes a wood block of mass 2 kg which is suspended by light inextensible string of length 5 m. As a result, the centre of gravity of the block found to rise a vertical distance of 10 cm. The speed of the bullet after it emerges out horizontally from the block will be

A particle moves from a point $$\left( { - 2\widehat i + 5\widehat j} \right)$$ to $$\left( {4\widehat j + 3\widehat k} \right)$$ when a force of $$\left( {4\widehat i + 3\widehat j} \right)$$ N is applied. How much work has been done by the force ?

Two rotating bodies A and B of masses m and 2m with moments of inertia $${I_A}$$ and $${I_B}$$ ($${I_B}$$ > $${I_A}$$) have equal kinetic energy of rotation. If L_A and L_B be their angular momenta respectively, then

A solid sphere of mass m and radius R is rotating about its diameter. A solid cylinder of same mass and same radius is also rotating about its geometrical axis with an angular speed twice that of the sphere. The ratio of their kinetic energies of rotation (E_sphere / E_cylinder) will be

A light rod of length $$l$$ has two masses m₁ and m₂ attached to its two ends. The moment of inertia of the system about an axis perpendicular to the rod and passing through the centre of mass is

A satellite of mass m is orbiting the earth (of radius R) at a height h from its surface. The total energy of the satellite in terms of g₀, the value of acceleration due to gravity at the earth's surface, is

A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be

Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100^oC, while the other one is at 0^oC. If the two bodies are brought into contact, then, assuming no heat loss, the final common temperature is

A rectangular film of liquid is extended from (4 cm $$ \times $$ 2 cm) to (5 cm $$ \times $$ 4 cm). If the work done is 3 $$ \times $$ 10^$$-$$4 J, the value of the surface tension of the liquid is

Three liquids of densities $$\rho $$₁, $$\rho $$₂  and $$\rho $$₃ (with $$\rho $$₁ > $$\rho $$₂ > $$\rho $$₃), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact $$\theta $$₁, $$\theta $$₂ and $$\theta $$₃ obey

One mole of an ideal monatomic gas undergoes a process described by the equation PV³ = constant. The heat capacity of the gas during this process is

The temperature inside a refrigerator is t₂ ^oC. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be

A given sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T. The mass of each molecule of the gas is m. Which of the following gives the density of the gas ?

A body of mass m is attached to the lower end of a spring whose upper end is fixed. The spring has negligible mass. When the mass m is slightly pulled down and released, it oscillates with a time period of 3s. When the mass m is increased by 1 kg, the time period of oscillations becomes 5 s. The value of m in kg is

Three sound waves of equal amplitudes have frequencies (n $$-$$ 1), n, (n + 1). They superimpose to give beats. The number of beats produced per second will be

The second overtone of an open organ pipe has the same frquency as the first overtone of a closed pipe L metre long. The length of the open pipe will be

Planck's constant (h), speed of light in vacuum (c) and Newton's gravitional constant (G) are three fundamental constants. Which of the following combinations of these has the dimension of length ?