One of the most important functions of botanical gardens is that

All of the following statements concerning the actinomycetous filamentous soil bacterium Frankia are correct except that

For retting of jute the fermenting microbe used is

Basophilic prokaryotes

There exists a close association between the alga and the fungus within a lichen. The fungus

Auxospores and hormogonia are formed, respectively, by

Match items in column $${\rm I}$$ with those in column $${\rm I}$$$${\rm I}$$. .tg {border-collapse:collapse;border-sp

Ectophloic siphonostele is found in

Top-shaped multiciliate male gametes and the nature seed which bears only one embryo with two cotyledons, are characteri

In contrast to annelids the platyhelminthes show

From the following statements select the wrong one

Which of the following unicellular organisms has a macronucleus for trophic function and one or more micronuclei for re

Which one of the following characters is not typical of the class mammalia?

Why is vivipary an undesirable character for annual crop plants?

Which of the following represents the edible part of the fruit of litchi?

Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these

The catalytic efficiency of two different enzymes can be compared by the

Which one of the following statements regarding enzyme inhibition is correct?

Which of the following is the simplest amino acid?

Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by

Carbohydrates, the most abundant biomolescule on earth, are produced by

At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?

Potometer works on the principle of

The deficiencies of micronutrients, not only affects growth of plants but also vital functions such as photosynthetic an

As compared to a C3-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose

Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because

Photosynthetic Active Radiation (PAR) has the following range of wavelengths.

During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

The ability of the Venus Flytrap to capture insects is due to

Secretin and cholecystokinin are digestive hormones. They are secreted in

Epithelial cells of the intestine involved in food absorption have on their surface

A patient is generally advised to specially consume more meat, lentils, milk and eggs in diet only when he suffers from

Which group of three of the following five statements (1 - 5) contain all three correct statements regarding beri-beri?

The net pressure gradient that causes the fluid to filter out of the glomeruli into the capsule is

In ornithine cycle, which of the following wastes are removed from the blood?

A person is undergoing prolonged fasting. His urine will be found to contain abnormal quantities of

An acromian process is characteristically found in the

Which of the following pairs is correctly matched?

Which one of the following is the example of the action of the autonomous nervous system?

Parkinson's disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neur

In a man, abducens nerve is injured. Which one of the following functions will be affected?

In a type of apomixis known as advice embryony, embryos develop directly from the

Through which cell of the embryo sac, does the pollen tube enter the embryo sac?

Which one of the following represents an ovule, where the embryo sac becomes horse-shoe shaped and the funiculus and mic

Grey crescent is the area -

If mammalian ovum fails to get fertilized, which one of the following is unlikely

In order to find out the different types of gametes produced by a pea plants having the genotype AaBb, it should be cros

G-6-P dehydrogenase deficiency is associated with haemolysis of -

A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughter an

A women with 47 chromosomes due to three copies of chromosome 21 is characterized by -

Haemophilia is more commonly seen in human males than in human females because -

A woman with normal vision, but whose father was colour bind, marries a colour blind man. Suppose that the fourth child

Which of the following is not a hereditary disease ?

E. coli cells with a mustard z gene of the lac operon cannot grow in medium containing only lactose as the source of ene

Telomerase is an enzyme which is a -

Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant

Which one of the following hydrolyses internal phosphodiester bonds in a polynucleotide chain ?

Protein synthesis in an animal cell occurs -

Which one of the following makes use of RNA as a template to synthesize DNA -

During transcription holoenzyme RNA polymerase binds to a DNA sequence and the DNA assumes a saddle like structure at th

De Vries gave his mutation theory on organic evolution while working on -

Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously f

There are two opposing views about origin of modern man. According to one view Homo erectus in Asia were the ancestors o

Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution ?

Which of the following is not true for a species ?

At a particular locus, frequency of 'A' allele is 0.6 and that of 'a' is 0.4. What would be the frequency of heterozygot

Which of the following is the relatively most accurate method for dating of fossils ?

Damage to thymus in a child may lead to

Which one of the following depresses brain activity and produces feelings of calmness, relaxation and drowsiness ?

Three crops that contribute maximum to global food grain production are -

The name of Norman Borlaug is associated with-

Which of the following is generally used for induced mutagenesis in crop plants ?

The world's highly prized wool yielding 'Pashmina' breed is -

Bacillus thuringiensis (Bt) strains have been used for designing novel -

Golden rice is a transgenic crop of the future with the following improved trait -

Production of a human protein in bacteria by genetic engineering is possible because

More than 70% of world's fresh water is contained in –

At which latitude, heat gain through insolation approximately equals heat loss through terrestrial radiation -

Which one of the following pairs in mismatched ?

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect ex

Biodiversity Act of India was passed by the Parliament in the year -

According to IUCN Red List, what is the status of Red Panda (Ailurus fulgens) ?

Prolonged liberal irrigation of agricultural fields is likely to create the problem of -

Which of the following is not used for disinfection of drinking water ?

Identify the correctly matched pair -

Which one of the following pairs is mismatched ?

In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues ?

Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cell of the follow

A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should i

Chlorophyll in chloroplasts is located in

Centromere is required for -

Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on

According to widely accepted "fluid mosaic model" cell membranes are semi-fluid, where lipids and integral proteins can

The main organelle involved in modification and routing of newly synthesized proteins to their destinations is -

A women with 47 chromosomes due to three copies of chromosome 21 is characterized by

The energy of second Bohr orbit of the hydrogen atom is $$-$$328 kJ mol$$-$$1; hence the energy of fourth Bohr orbit wou

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of t

The correct order in which the O $$-$$ O bond length increases in the following is

Which of the following molecules has trigonal planar geometry?

The surface tension of which of the following liquid is maximum ?

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction ?

A reaction occurs spontaneously if

The absolute enthalpy of neutralisation of the reaction : Mg(O)(s) + 2HCl(aq) $$ \to $$ MgCl2(aq) + H2O(l) will be

H2S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative

At 25oC, the dissociation constant of a base, BOH, is 1.0 $$ \times $$ 10$$-$$12. The concentration of hydroxyl ions in

Equilibrium constants K1 and K2 for the following equilibriam: are related as

Which one of the following pairs represents stereoisomerism?

Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?

Which amongst the following is the most stable carbocation?

The chirality of the compound

Names of some compounds are given. Which one is not in IUPAC system?

The best method for the separation of naphthalene and benzoic acid from their mixture is

Products of the following reaction :

Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions ?

Which one of the following compounds is most acidic?

The correct sequence of increasing covalent character is represented by

The major organic product formed from the following reaction : is

In a set of reactions acetic acid yielded a product D. The structure of D would be

Electrolytic reduction of nitrobenzene in weakly acidic medium gives

Aniline in a set of reactions yielded a product D. The structure of the product D would be

The cell membranes are mainly composed of

Which functional group participates in disulphide bond formation in proteins?

The monomer of the polymer

In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells?

The mole fraction of the solute in one molal aqueous solution is

The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtai

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at 20oC are 440 mm

A solution of urea (mol. mass 56 g mol$$-$$1) boils at 100.18oC at the atmospheric pressure. If Kf and Kb for water are

4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al3+ solution by a certain quantity of electric charge

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxi

The rate of reaction between two reactions A and B decreases by a factor of 4 if the concentration of reactant B is doub

For a first order reaction A $$ \to $$ B the reaction rate a reactant concentration of 0.01 M is found to be 2.0 $$ \tim

Which one of the following forms micelles in aqueous solution above certain concentration?

Which one of the following oxides is expected to exhibit paramagnetic behaviour?

Which of the following would have a permanent dipole moment?

What is the correct relationship between the pH of isomolar solutions of sodium oxide, Na2O (pH1), sodium sulphide, Na2S

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is

The aqueous solution containing which one of the following ions will be colourless? (Atomic number : Sc = 21, Fe = 26,

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of th

A nuclide of an alkaline earth metal undergoes radioactive decay by emission of the periodic table to which the resultin

Which one of the following is an inner orbital complex as well as diamagnetic in behaviour?

Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)

Which one of the following orders correctly represents the increasing acid strengths of the given acids?

The ratio of the dimensions of Planck's constant and that of moment of inertia is the dimensions of

A ball is thrown vertically upward. It has a speed of 10 m/sec when it has reached one half of its maximum height. How h

The displacement x of a particle varies with time t as x = ae$$-$$at + be$$\beta $$t, where a, b, $$\alpha $$ and $$\bet

Two boys are standing at the ends A and B of a ground where AB = a. The boy at B starts running in a direction perpen

A stone tied to the end of a string of 1 m long is whirled in a horizontal circle with a constant speed. If the stone

If the angle between the vectors $$\overrightarrow A $$ and $$\overrightarrow B $$ is $$\theta $$, the value of the pro

If a vector $$2\widehat i + 3\widehat j + 8\widehat k$$ is perpendicular to the vector $$4\widehat j - 4\widehat i + \al

A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 m s$$-$

A force F acting on an object varies with distance x as shown here. The force is in N and x in m. The work done by the

A drum of radius R and mass M, rolls down without slipping along an inclined plane of angle $$\theta $$. The frictional

The moment of inertia of a uniform circular disc of radius R and mass M about an axis passing from the edge of the disc

Two bodies have their moments of inertia I and 2I respectively about their axis of rotation. If their kinetic energies o

For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is

Imagine a new planet having the same density as that of earth but it is 3 times bigger than the earth in size. If the ac

Which of the following rods, (given radius r and length $$l$$) each made of the same material and whose ends are maintai

An ideal gas heat engine operates in Carnot cycle between 227oC and 127oC. It absorbs 6 $$ \times $$ 104 cal of heat at

Which of the following processes is reversible?

The circular motion of a particle with constant speed is

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2

A network of four capacitors of capacity equal to C1 = C, C2 = 2C, C3 = 3C and C4 = 4C are connected to a battery as sho

As per the diagram a point charge +q is placed at the origin O. Work done in taking another point charge $$-$$Q from th

Two charges q1 and q2 are placed 30 cm apart, as shown in the figure. A third charge q3 is moved along the arc of a cir

Two batteries, one of emf 18 volts and internal resistance 2 $$\Omega $$ and the other of emf 12 volts and internal resi

When a wire of uniform cross-section $$a$$ length $$l$$ and resistance R is bent into a complete circle. resistance betw

For the network shown in the figure the value of the current $$i$$ is

A 5-ampere fuse wire can withstand a maximum power of 1 watt in the circuit. The resistance of the fuse wire is

An electron moves in a circular orbit with a uniform speed v. It producess a magnetic field B at the centre of the circl

A very long straight wire carries a current $$I$$. At the instant when a charge +Q at point P has velocity $$\overrighta

A coil in the shape of an equilateral triangle of side $$l$$ is suspended between the pole pieces of a permanent magnet

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are d

As a result of change in the magnetic flux linked to the closed loop as shown in the figure, an e.m.f. $$V$$ volt is ind

In a circuit L, C and R are connected in series with an alternating voltage source of frquency $$f.$$ The current leads

If $$\lambda $$v, $$\lambda $$x and $$\lambda $$m represent the wavelengths of visible light, X-rays and microwaves resp

The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 $$\mathop A\limits^ \circ $$ is of the ord

The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the

A photosensitive metallic surface has work function, h$$\upsilon $$0. If photons of energy $$2h{\upsilon _0}$$ fall on t

In the reaction $${}_1^2$$H + $${}_1^3$$H $$ \to $$ $${}_2^4$$He + $${}_0^1$$n, if the binding energies of $${}_1^2$$ H,

The total energy of an electron in the first excited state of hydrogen atom is about $$-$$ 3.4 eV. Its kinetic energy in

Which one of the following pairs of nuclei are isotones ?

In any fission process the ratio mass of fission products mass of parent nucleus is

Fission of nuclei is possible because the binding energy per nucleon in them

Energy levels A, B and C of a certain atom corresponding to increasing values of energy i.e. EA < EB < EC. If $$

Choose the only false statement from the following.

Application of a forward bias to a p-n junction

Zener diode is used for

Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated b

Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54 $$\mathop A\limits^ \circ $$. The v

In a p-n junction photo cell, the value of the photo-electromotive force profuced by monochromatic light is proportional