Virus envelope is known as

Single-celled eukaryotes are included in

One of the free-living, anaerobic nitrogen-fixer is

Some hyperthermophilic organisms that grow in highly acidic (pH 2) habitats belong to the two groups

Membrane-bound organelles are absent in

Male and female gametophytes are independent and free-living in

Algae have cell wall made up of:

One example of animals having a single opening to the outside that serves both as mouth as well as anus is

Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?

Which one of the following kinds of animals are triploblastic?

Which one of the following statements about certain given animals is correct?

The scutellum observed in a grain of wheat or maize is comparable to which part of the seed in other monocotyledons?

Keel is characteristic of the flowers of

The technical term used for the androecium in a flower of China rose (Hibiscus rosa sinensis) is

Ovary is half-inferior in the flowers of

During mitosis, ER and nucleolus begin to disappear at

PGA as the first CO2 fixation product was discovered in photosynthesis of

C4 plants are more efficient in photosynthesis than C3 plants due to

The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called

Phototropic curvature is the result of uneven distribution of

Photoperiodism was first characterised in

Coiling of garden pea tendrils around any support is an example of

What is true about RBCs in humans?

Listed below are four respiratory capacities (i $$-$$ iv) and four jumbled respiratory volumes of a normal human adult.

If due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non-functional, what w

Which two of the following changes (i $$-$$ iv) usually tend to occur in the plain dwellers when they move to high altit

Which one of the following statements in regard to the excretion by the human kidneys is correct?

The principal nitrogenous excretory compound in humans is synthesised

Which one of the following is the correct description of a certain part of a normal human skeleton?

The nerve centres which control the body temperature and the urge for eating are contained in

Low Ca++ in the body fluid may be the cause of

Injury to adrenal cortex is not likely to affect the secretion of which one of the following?

Which one of the following pairs is incorrectly matched?

Toxic agents present in food which interfere with thyroxine synthesis lead to the development of

select the correct matching of a hormone, its source and function.

Apomictic embryos in Citrus arise form

Transfer of pollen grains from the another to the stigma of another flower of the same plant is called

Wind pollinated flowers are

Seminal plasma in human males is rich in

Sertoli cells are found in :

Vasa efferentia are the ductules leading from :

The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnanc

The second maturation division of the mammalian ovum occurs

Which one of the following statements about human sperm is correct?

Which one of the following statements about morula in humans is correct?

The part of Fallopian tube closest to the ovary is

The permissible use of the technique aminocentesis is for

In vitro fertilization is a technique that involves transfer of which one of the following into the fallopian tube?

Cu ions released from copper-releasing Intra Uterine Devices (IUDs) –

Which one of the following symbols and its representation, used in human pedigree analysis is correct –

ABO blood groups in humans are controlled by the gene I. It has three alleles – IA, IB and i. Since there are three dif

Select the correct statement from the ones given below with respect to dihybrid cross –

The genotype of a plant showing the dominant phenotype can be determined by –

Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?

Which one of the following does not follow the central dogma of molecular biology ?

Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular re

The one aspect which is not a salient feature of genetic code, is its being –

Select the two correct statements out of the four (a-d) statements given below about lac operon. (a) Glucose or galacto

Darwin's finches are a good example of –

Widal test is used for the diagnosis of –

Ringworm in humans is caused by :

Which one of the following statements is correct with respect to AIDS ?

Infectious proteins are present in –

Select the correct statement from the ones given below :

Breeding of crops with high levels of minerals, vitamins and proteins is called –

The common nitrogen-fixer in paddy fields is –

Which one of the following not used in organic farming ?

A common biocontrol agent for the control of plant diseases is –

Select the correct statement from the following:

DNA or RNA segment tagged with a radioactive moleculer is called –

Which one of the following is used as vector for cloning genes into higher organisms ?

Restriction endonucleases are enzymes which –

Which of the following are used in gene cloning ?

Stirred-tank bioreactors have been designed for –

The genetically-modified (GM) brinjal in India has been developed for:

Some of the characteristics of Bt cotton are –

Genetic engineering has been successfully used for producing –

An improved variety of transgenic basmati rice

The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do a, b and c

Which one of the following is one of the characteristics of a biological community?

The biomass available for consumption by the herbivores and the decomposers is called –

Study the four statements (a–d) given below and select the two correct ones out of them – (a) A lion eating a deer and

Which one of the following is an example of ex situ conservation ?

Which one of the folliwng is not a lateral meristem ?

Heartwood differs from sapwood in –

The chief water conducting elements of xylem in gymnosperms are :

The cells lining the blood vessels belongs to the category of :

The main area of variuos types of activites of a cell is –

The plasma membrane consists mainly of –

Which one of the following has its own DNA?

Which one of the following structures between two adjacent cells is an effective transport pathway?

Which stages of cell division do the following figures A and B represent respectively?

The number of atoms in 0.1 mol of a triatomic gas is (NA = 6.02 $$ \times $$ 1023 mol$$-$$1)

25.3 g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissocia

The correct order of the decreasing ionic radii among the following isoelectronic species is

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elem

In which of the following pairs of molecules/ ions, the central atoms have sp2 hybridisation ?

Which one of the following species does not exist under normal conditions?

In which one of the following species the central atom has the type of hybridization which is not the same as that prese

For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is $$\Delta $$H (both of these in kJ/mo

Standard entropies of X2, Y2 and XY3 are 60, 40 and 50 J K$$-$$1 mol$$-$$1 respectively. For the reaction 1/2X2 + 3/2Y

If pH of a saturated solution of Ba(OH)2 is 12, the value of its Ksp is

In a buffer solution containing equal concentration of B$$-$$ and HB, the Kb for B$$-$$ is 10$$-$$10. The pH of buffe

What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH? Ka for CH3COOH = 1.8 $$ \times $

In which of the following equilibrium Kc and Kp are not equal?

Which one of the following is most reactive towards electrophilic reagent?

In the following the most stable conformation of n-butane is

Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by

The reaction of toluene with Cl2 in presence of FeCl3 gives X and reaction in presence of light gives Y. Thus, X and Y a

In a set of reactions, ethylbenzene yielded a product D. D would be

Which one is most reactive towards SN1 reaction?

The correct order of increasing reactivity of C$$-$$X bond towards nucleophile in the following compounds is

Given are cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV). In these the order of decrea

Among the following four compounds (i)  Phenol (ii)  Methyl phenol (iii)  Meta-nitropheno

Which of the following compounds has the most acidic nature?

Acetamide is treated with the following reagents separately. Which one of these would yield methyl amine?

Which of the following reactions will not result in the formation of carbon-carbon bonds?

Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is

Which of the following statements about primary amines is false?

Aniline in a set of the following reactions yielded a coloured product Y. The structure of 'Y' would be

Which one of the following does not exhibit the phenomenon of mutaroation?

A solution of sucrose (molar mass = 342 g mol$$-$$) has been prepared by dissolving 68.5 g of sucrose in 1000 g of water

An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to

For the reduction of silver ions with copper metal, the standard cell potential was found to be + 0.46 V at 25oC. The va

For the reaction N2O5(g) $$ \to $$  2NO2(g) + 1/2O2(g) the value of rate of disappearance of N2O5 is given a

During the kinetic study of the reaction, 2A + B $$ \to $$ C + D, following results were obtained .tg {border-collapse

Which one of the following molecular hydrides acts as a Lewis acid?

The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence

The correct order of increasing bond angles in the following species is

Oxidation states of P in H4P2O5, H4P2O6, H4P2O7 are respectively

Which of the following ions will exhibit colour in aqueous solutions?

Which of the following pairs has the same size?

Which of the following ions has electronic configuration [Ar]3d6? (At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

The existance of two different coloured complexes with the composition of [Co(NH3)4Cl2]+ is due to

Which of the following complex ions is not expected to absorb visible light?

Crystal field stabilization energy for high spin d4 octahedral complex is

Which one of the following complexes is not expected to exhibit isomerism?

The dimension of $${1 \over 2}{\varepsilon _0}{E^2}$$, where $${\varepsilon _0}$$ is permittivity of free space and E is

A particle moves a distance x in time t according to equation x = (t + 5)$$-$$1. The acceleration of particle is proport

A ball is dropped from a high rise platform at t = 0 starting from rest. After 6 seconds another ball is thrown downward

A particle has initial velocity $$\left( {3\widehat i + 4\widehat j} \right)$$ and has acceleration $$\left( {0.4\wideha

Six vectors, $$\overrightarrow a $$ through $$\overrightarrow f $$ have the magnitudes and directions indicated in the f

A block of mass m is in contact with the cart C as shown in the figure. The coefficient of static friction between the b

A ball moving with velocity 2 m/s collides head on with another stationary ball of double the mass. If the coefficient o

An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 m/s. The mas

A circular disk of moment of inertia $${I_t}$$ is rotating in a horizontal plane, about its symmetry axis, with a consta

Two particles which are initially at rest, move towards each other under the action of their internal attraction. If the

A gramophone record is revolving with an angular velocity $$\omega $$. A coin is placed at a distance r from the centre

A particle of mass M is situated at the centre of a spherical shell of same mass and radius a. The magnitude of the grav

The radii of circular orbits of two satellites A and B of the earth, are 4R and R, respectively. If the speed of satelli

A man of 50 kg mass is standing in a gravity free space at a height of 10 m above the floor. He throws a stone of 0.5 kg

A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat Q i

The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre o

Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature toC, the powe

If $$\Delta $$U and $$\Delta $$W represent the increase in internal energy and work done by the system respectively in a

The displacement of a particle along the x-axis is given by x = asin2$$\omega $$t. The motion of the particle correspond

The period of oscillation of a mass M suspended from a strong of negligible mass is T. If along with it another mass M i

A transverse wave is represented by y = Asin($$\omega $$t $$-$$ kx). For what value of the wavelength is the wave veloc

A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string of a piano. The beat frequency decr

Two positives ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the

A square surface of side L meter in the plane of the paper is placed in a uniform electric field $$E$$(volt/m) acting al

A series combination of n1 capacitors, each of value C1, is charged by a source of potential difference 4V. When another

Consider the following two statements. (A)  Kirchoff's junction law follows from the conservation of charge.

A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is k volt/cm and the

Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency $$f$$

A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as

A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on

A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as

Electromagnets are made of soft iron because soft iron has

A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a ti

A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop.

A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the eff

In the given circuit the reading of voltmeter V1 and V2 are 300 volts each. The reading of the voltmeter V3 and ammeter

Which of the following statement is false for the properties of electromagnetic waves ?

A ray of light travelling in a transparent medium of refractive index $$\mu $$, falls on a surface separating the medium

A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter $${d \over 2

A beam of cathode rays is subjected to crossed electric (E) and magnetic fields (B). The fields are adjusted such that t

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having wor

A source S1 is producing, 1015 photons per second of wavelength 5000 $$\mathop A\limits^ \circ $$. Another source S2 is

The energy of a hydrogen atom in the ground state is $$-$$ 13.6 eV. The energy of a He+ ion in the first excited state

The mass of a $${}_3^7Li$$ Li nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy

The energy of a hydrogen atom in the ground state is $$-$$ 13.6 eV. The energy of a He+ ion in the first excited state w

An alpha nucleus of energy $${1 \over 2}$$ mv2 bombards a heavy nuclear target of charge Ze. Then the distance of close

To get an output Y = 1 in given circuit which of the following input will be correct ?

Which one of the following statement is false ?

The device that can act as a complete electronic circuit is

Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conduc