Meiosis takes place in

During seed germination its stored food is mobilized by

The diagram given here is the standard ECG of a normal person. The P-wave represents the

The H-zone in the skeletal muscle fibre is due to

Select the correct statement with respect to locomotion in humans.

The characteristic and an example of a synovial joint in humans is

The most abundant intracellular cation is

Which of the following statements is correct in relation to the endocrine system?

A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient and abnormal skin. This is the result of

Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom.

Seed coat is not thin, membranous in

The three boxes in this diagram represent the three major biosynthetic pathway in aerobic respiration. Arrows represent net reactants or products.


Arrows numbered 4, 8 and 12 can all be

Perisperm differs from endosperm in

Advantage of cleistogamy is

Megasporangium is equivalent to

Which one of the following statements is correct?

Product of sexual reproduction generally generates

What is the correct sequence of sperm formation?

Which of the following is not the function of placenta?

Menstrual flow occurs due to lack of :

Artificial insemination means :

One of the legal methods of birth control is :

Which group of animals belong to the same phylum?

Which one of the following is not a correct statement?

Which of the following are likely to be present in deep sea water?

Pigment containing membranous extensions in some cyanobacteria are

Select the wrong statement

Isogamous condition with non-flagellated gametes is found in

Monoecious plant of Chara shows occurrence of

Read the following statements (A - E) and answer the question which follows them.

(A)   In liverworts, mosses and ferns gametophytes are free-living.
(B)   Gymnosperms and some ferns are heterosporous.
(C)   Sexual reproduction in Fucus, Volvox and Albugo is oogamous.
(D)   The sporophyte in liverworts is more elaborate than that in mosses.
(E)   Both, Pinus and Marchantia are dioecious.

How many of the above statements are correct?

Which of the following are correctly matched with respect to their taxonomic classification?

One of the representatives of Phylum Arthropoda is

Match the name of the animal (column I), with one characteristic (column II), and the phylum/class (column III) to which it belongs.

Select the incorrect statement with regard to Haemophilia is :

Among bitter gourd, mustard, brinjal, pumpkin, china rose, lupin, cucumber, sunhemp, gram, guava, beam, chilli, plum, petunia, tomato, rose, Withania, potato, onion, aloe and tulip how many plants have hypogynous flower?

In China rose the flowers are

A phosphoglyceride is always made up of

Macromolecule chitin is

The essential chemical components of many coenzymes are

Transition state structure of the substrate formed during an enzymatic reaction is

The complex formed by a pair of synapsed homologous chromosomes is called

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

Interfascicular cambium develops from the cells of :

Natural reservoir of phosphorus is :

Which one of the following processes during decomposition is correctly described ?

Secondary productivity is rate of formation of new organic matter by :

Which one of the following is not used for ex situ plant conservation?

Which of the following represent maximum number of species among global biodiversity ?

Which of the following represent maximum number of species among global biodiversity ?

Lenticels are involved in

Age of a tree can be estimated by :

A biologist studied the population of rats in a barn, He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

What external changes are visible after the last moult of a cockroach nymph ?

Which one of the following organelle in the figure correctly matches with its function ?

A major site for synthesis of lipids is :

The Golgi complex plays a major role :

A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics.

The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and / or characteristic.

The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the label and give its functions?

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/ characteristics.

A diagram showing axon terminal and synapse is given. Identify correctly at least two of A - D.

Figure shows human urinary system with structures labelled A to D. Select option which correctly identifies them and gives their characteristic and/or functions.

The process by which organisms with different evolutionary history evolve similar phenotypic adaptations in response to a common environmental challenge is called :

Which idea is depicted by a cross in which the F₁ generation resembles both the parents?

If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group : 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of :

Which of the following cannot be detected in a developing foetus by amniocentesis ?

If both parents are carriers for thalessemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child ?

The diagram shows an important concept in the genetic implication of DNA. Fill in the blanks A to C.

Which enzyme will be produced in a cell in which there is a non-sense mutation in the lac Y gene ?

Which of the following statements is not true of two genes that show 50% recombination frequency ?

According to Darwin, the organic evolution is due to -

The tendency of population to remain in genetic equilibrium may be disturbed by :

Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as :

The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function, This is an example of :

Infection of Ascaris usually occurs by :

A good producer of citric acid is

DNA fragments generated by the restriction endonucleases in a chemical reaction can be separated by :

Which of the following is not corretly matched for the organism and its cell wall degrading enzyme ?

The colonies of recombinat bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of :

Which of the following Bt crops is being grown in India by the farmers ?

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is :

Besides paddy fields, cyanobacteria are also found inside vegetative part of :

An excess of AgNO₃ is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitated would be

6.02 $$ \times $$ 10²⁰ molecules of urea present in 100 mL of its solution. The concentration of solution is

The basic structural unit of silicates is

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO₃? The concentrated acid is 70% HNO₃.

At 25^oC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm^$$-$$1 cm² mol^$$-$$1 and at infinite dilution its molar conductance is 238 ohm^$$-$$1 cm² mol^$$-$$1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is

A button cell used in watches function as following.
Zn_(s) + Ag₂O_(s) + H₂O_(l) $$\rightleftharpoons$$ 2Ag_(s) + Zn²⁺_(aq) + 2OH^$$-$$_(aq)

If half cell potentials are
Zn²⁺_(aq) + 2e^$$-$$ $$ \to $$ Zn_(s);  E^o = $$-$$0.76 V
Ag₂O_(s) + H₂O_(l) + 2e^$$-$$ $$ \to $$ 2Ag_(s) + 2OH^$$-$$_(aq), E^o = 0.34 V

The cell potential will be

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20^oC to 35^oC?
(R = 8.314 J mol^$$-$$1 K^$$-$$1)

Which of these is not a monomer for a high molecular mass silicone polymer?

In the reaction

A is

Which of the following structure is similar to graphite?

Which is the strongest acid in the following?

Which one of the following molecules contains no $$\pi $$ bond?

Which of the following does not give oxygen on heating?

Which of the following lanthanoid ions is diamagnetic?
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

Identify the correct order of solubility in aqueous medium.

Which of the following statements about the interstitial compounds is incorrect?

A magnetic moment at 1.73 BM will be shown by one among of the following

KMnO₄ can be prepared from K₂MnO₄ as per the reaction,

3MnO₄^2$$-$$ + 2H₂O $$\rightleftharpoons$$ 2MnO₄^$$-$$ + MnO² + 4OH^$$-$$

The reaction can go to completion by removing OH^$$-$$ ions by adding

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ?
n = 3, $$l$$ = 1 and m = $$-$$ 1

Based on equation E = $$-$$ 2.178 $$ \times $$ 10^$$-$$18 J $$\left( {{{{Z^2}} \over {{n^2}}}} \right)$$, certain conclusions are written. Which of them is not correct ?

The value of Planck's constant is 6.63 $$ \times $$ 10^$$-$$34 J s. The speed of light is 3 $$ \times $$ 10¹⁷ mm s^$$-$$1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 $$ \times $$ 10¹⁵ s^$$-$$1 ?

Which of the following is electron-deficient ?

XeF₂ is isostructural with

Dipole-induced dipole interactions are present in which of the following pairs

Which of the following is a polar molecule?

Which of the following is paramagnetic?

A reaction having equal energies of activation for forward and reverse reactions has

Which of these is least likely to act as a lewis base ?

The radical,

is aromatic because it has

Structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating ?

The structure of isobutyl group in an organic compound is

Which of the following compounds will not undergo Friedal-Craft's reaction easily?

Among the following ethers, which one will produce methyl alcohol on treatment with hot concentrated HI?

The order of stability of the following tautomeric compounds is

Reaction by which benzaldehyde cannot be prepared

Nitrobenzene on reaction with conc. HNO₃/H₂SO₄ at 80$$-$$100^oC forms which one of the following products?

For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behinf the cornea is 20 D. Using this information, the distance between the retina and the cornea-eye lens can be estimated to be

A, B and C are three points in a uniform electric field. The electric potential is

The resistances of the four arms P, Q, R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the celll will be

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 $$\Omega $$ is

A wire of resistance 4 $$\Omega $$ is stretched to twice its original length. The resistance of stretched wire would be

When a proton is released from rest in a room, it starts with an initial acceleration $$a$$₀ towards west. When it is projected towards north with a speed $$v$$₀ it moves with an initial acceleration 3$$a$$₀ towards west. The an initial accelearation 3a₀ towards west. The an initial acceleration 3$$a$$₀ toward west. The electric and magnetic fields in the room are

A current loop in a magnetic field

A bar magnet of length $$'l'$$ and magnetic dipole moment 'M' is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is

A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $$\mu $$₁ and $$\mu $$₂ and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is

Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become

In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths $${\lambda _1}$$ = 12000 $$\mathop A\limits^ \circ $$ and $${\lambda _2}$$ = 10000 $$\mathop A\limits^ \circ $$. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other ?

A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct ?

For photoelectric emission from certain metal the cutoff frequency is $$\upsilon $$. If radiation of frequency 2$$\upsilon $$ impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)

The wavelength $$\lambda $$_e of an electron and $$\lambda $$_p of a photon of same energy E are related by

Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen spectrum is

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (given 1 u = 931 MeV)

The output (X) of the logic circuit shown ion figure will be

A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using

A stone falls freely under gravity. It covers distances h₁, h₂ and h₃ in the first 5 seconds, the next 5 seconds and the next 5 seconds respectively. The relation between h₁, h₂ and h₃ is

The velocity of a projectile at the initial point A is $$\left( {2\widehat i + 3\widehat j} \right)$$ m/s. It's velocity (in m/s) at point B is

An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 m s^$$-$$1 and the second part of mass 2 kg moves with 8 m s^$$-$$1 speed. If the third part files off with 4 m s^$$-$$1 speed, then its mass is :

The upper half of an inclined plane of inclination $$\theta $$ is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given by

Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upwards at constant speed v. What is the net force on the block of mass 2m ? (g is the acceleration due to gravity)

A uniform force of $$\left( {3\widehat i + \widehat j} \right)$$ newton acts on a particle of mass 2 kg. Hence the particle is displaced from position $$\left( {2\widehat i + \widehat k} \right)$$ metre to position $$\left( {4\widehat i + 3\widehat j - \widehat k} \right)$$ metre. The work done by the force on the particle is

A small object of uniform density rolls up a curved surface with an initial velocity 'v'. It reaches upto a maximum height of $${{3{v^2}} \over {4g}}$$ with respect to the initial position. The object is

A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is

A body of mass 'm' is taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be

Infinite number of bodies, each of mass 2 kg are situated on x-axis at distance 1 m, 2 m, 4 m, 8 m, . . . , respectively, from the origin. The resulting gravitational potential due to this system at the origin will be

The molar specific heats of an ideal gas at constant pressure and volume are denoted by C_p and C_v, respectively. If  $$\gamma $$ = $${{{C_p}} \over {{C_v}}}$$ and R is the universal gas constant, then C_v is equal to

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

The wettability of a surface by a liquid depends primarily on

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T₁K to T₂K is

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of $${{{C_p}} \over {{C_p}}}$$ for the gas is

In the given (V $$-$$ T) diagram, what is the relation between pressure P₁ and P₂?

A gas is taken through the cycle
A $$ \to $$ B $$ \to $$ C $$ \to $$ A, as shown. what is the net work done by the gas?

If we study the vibration of a pipe open at both ends. then the following statement is not true.

A wave travelling in the + ve x-direction having displacement along y-direction as 1 m, wavelength 2$$\pi $$ m and frequency of $${1 \over \pi }$$ Hz is represented by

A source of unknown frequency gives 4 beats/s when sounded with a source of known frquency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is

If an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively.

Quantity P is calculated as follows P $$ = {{{a^3}{b^2}} \over {cd}}$$ % error in P is