Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone

The major role of minor elements inside living organisms is to act as

Which one of the following is wrong in relation to photorespiration?

Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?

In sugarcane plant 14CO2 is fixed to malic acid, in which the enzyme that fixes CO2 is

Stomata of CAM plants

Which element is located at the centre of the porphyrin ring in chlorophyll?

Which one of the following concerns photophosphorylation?

In alcohol fermentation

In which one of the following do the two names refer to one and same thing?

Juicy hair-like structures observed in the lemon fruit develop from

Nicotiana sylvestris flowers only during long days and N.tabacum flowers only during short days. If raised in the labora

Differentiation of shoot is controlled by

Bundle of His is a network of

The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be gr

In the ABO system of blood groups, if both antigens are present but no antibody, the blood group of the individual would

If Henle's loop were absent from mammalian nephron, which one of the following is to be expected?

What used to be described as Nissl's granules in a nerve cell are now identified as

Which one of the following pairs correctly matches a hormone with a disease resulting from its deficiency?

In a flowering plant, archesporium gives rise to

Which one of the following pairs of plants are not seed producers?

Species are considered as

Biosystematics aims at

Phenetic classification of organisms is based on

Chromosomes in a bactertial cell can be 1 $$-$$ 3 in number and

Tobacco mosaic virus is a tubular filament of size

Which one of the following statements about viruses is correct?

Viruses are no more ''alive'' than isolated chromosomes because

In which kingdom would you classify the archaea and nitrogen-fixing organisms, if the five-kingdom system of classificat

During embryonic development, the establishment of polarity along anterior/posterior, dorsal/ventral or medial/lateral a

Sexual reproduction in Spirogyra is an advanced feature because it shows

Plants reproducing by spores such as mosses and ferns are grouped under the general term

Which one pair of examples will correctly represent the grouping spermatophyta according to one of the schemes of classi

Bartholin's glands are situated

The chief advantage of encystment of an Amoeba is

Systemic heart refers to

During the life-cycle, Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following l

Sycon belongs to a group of animals, which are best described as

Ommatidia serve the purpose of photoreception in

Which one of the following is a matching pair of an animal and a certain phenomenon it exhibits?

Given below are four matchings of an animal and its kind of respiratory organ : (A)  Silver fish  &

Which endangered animal is the source of the world's finest, lightest, warmest and most expensive wool - the shahtoosh ?

Carcinoma refers to : -

Short-lived immunity acquired from mother to foetus across placenta or through mother's milk to the infant is categorise

Christmas disease is another name for : -

Which of the following plants are used as green manure in crop fields and in sandy soils ?

Maximum application of animal cell culture technology today is in the production of : -

During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undergraded

In recent years, DNA sequences (nucleotide sequence) of mt-DNA and Y chromosomes were considered for the study of human

Which one of the following bacteria has found extensive use in genetic engineering work in plants ?

ELISA is used to detect viruses, wherethe key reagent is :-

Mycorrhiza is an example of :-

Which group of vertebrates comprises the highest number of endangered species ?

Which one of the following describes correctly the homologous structures ?

The apical meristem of the root is present

In which one of the following nitrogen is not a constituent ?

The aleurone layer in maize grain is specially rich in :-

Chlorenchyma is known to develop in the : -

Diffuse porous wood is characteristics of those plants which are growing in : -

The cells of the quiescent centre are characterised by : -

Which one of the following contains the largest quantity of extracellular material ?

Cellular totipotency is demonstrated by :-

Coconut milk factor is

What would happen if in a gene encoding a polypeptide of 50 amino acids, 25th codon (UAU) is mutated to UAA ?

Test tube baby means a baby born when

Two opposite forces operate in the growth and development of every population. One of them relates to the ability to rep

Which one of the following traits of garden pea studied by Mendel was a recessive feature ?

The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chrom

Pattern baldness, moustaches and beard in human males are examples of : -

Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cro

Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected

Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infect

In Drosophila, the sex is determined by : -

During translation initiation in prokaryotes, a GTP molecule is needed in : -

In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids : -

Degeneration of a genetic code is attributed to the : -

During transcription, the DNA site at which RNA polymerase binds is called :-

What does "lac" refer to in what we call the lac operon ?

Which one of the following triplet codes, is correctly matched with its specificity for an amino acid in protein synthes

Which one of the following sequences was proposed by Darwin and Wallace for organic evolution ?

Convergent evolution is illustrated by : -

Random genetic drift in a population probably results from

Darwin in his 'Natural Selection Theory' did not believe in any role of which one of the following in organic evolution

In a random mating population in equilibrium, which of the following brings about a change in gene frequency in a non-di

Industrial melanism is an example of : -

Which one of the following is categorised under living fossils ?

The radioistope, tritium ($${}_1^3$$H) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how man

Among the following which is not the $$\pi $$-bonded organometallic compound?

The number of unpaired electrons in the complex ion [CoF6]3$$-$$ is (Atomic no. : Co = 27)

The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is (Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)

In this reaction : CH3CHO + HCN $$ \to $$ CH3CH(OH)CN           &nbsp

When $$m$$-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is (are)

$$A$$ and $$B$$ in the following reactions are :

In a set of the given reactions, acetic acid yielded a product C. Product $$C$$ would be

The final product C, obtained in this reaction would be

Glycolysis is

Vitamin B12 contains

Phospholipids are esters of glycerol with

Chargaff's rule states that in an organism

The e.m.f. of a Daniell cell at 298 K is E1. When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the

On the basis of the information available from the reaction, 4/3Al + O2 $$ \to $$ 2/3Al2O3,   $$\Delta $$G =

The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, $$k =

If the rate of the reaction is equal to the rate constant, the order of the reaction is

The reaction A $$ \to $$ B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1

The activation energy for a simple chemical reaction A $$\rightleftharpoons$$ B is E$$a$$ in forward direction. The acti

Which one of the following compounds is not a protonic acid?

Which one of the following characteristics of the transition metals is associated with their catalytic activity?

The basic character of the transition metal monoxides follows the order (Atomic no's. Ti = 22, V = 23, Cr = 24, Fe = 26)

The equilibrium constants of the following are N2 + 3H2 $$\rightleftharpoons$$ 2NH3;     K1 N2

The velocity of Planck's constant is 6.63 $$ \times $$ 10$$-$$34 J s. The velocity of light is 3.0 $$ \times $$ 108 m

The ions O2$$-$$, F$$-$$, Na+, Mg2+ and Al3+ are isoelectronic. Their ionic radii show

Which one of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms?

For the reaction, C3H8(g) + 5O2(g) $$ \to $$ 3CO2(g) + 4H2O(l) at constant temperature, $$\Delta $$H $$-$$ $$\Delt

The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm$$-$$3, respectively. If the standard free energy d

For which one of the following equations is $$\Delta $$Horeact equal to $$\Delta $$Hof for the product ?

Formation of solution from two components can be considered as (i) Pure solvent $$ \to $$ separated solvent m

The molar heat capacity of water at constant pressure, C, is 75 J K$$-$$1 mol$$-$$1. When 1.0 kJ of heat is supplied to

What is the entropy change (in J K$$-$$1 mol$$-$$1) when one mole of ice is converted into water at 0oC? (The enthalpy c

Which one of the following statements is not true?

The reaction quotient (Q) for the reaction N2(g) + 3H2(g) $$\rightleftharpoons$$ 2NH3(g) is given by $$Q = {{{{\left[

The solubility product of AgI at 25oC is 1.0 $$ \times $$ 10$$-$$16 mol2 L$$-$$2. The solubility of AgI in 10$$-$$4 N so

Name of the compound given below is

Which one of the following orders of acid strength is correct ?

The compound on reaction with NaIO4 in the presence of KMnO4 gives

Which one of the following is a free-radical substitution reaction ?

The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I), benzene (II) and ni

Which of the following pairs of compounds are enantiomers?

The oxidation states of sulphur in the anions SO3$${_3^{2 - }}$$, S2O$${_4^{2 - }}$$ and S2O$${_6^{2 - }}$$ follow t

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal

Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected

An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle

Fuse wire is a wire of

In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R,

A charged particle moves through a magnetic field in a firection perpendicular to it. Then the

A long solenoid carrying a current producess a magnetic field B along its axis. If the current is doubled and the number

A diamagnetic material in a magnetic field moves

According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature $$T$$ is proportional to

A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to its period and motion if its

We consider the radiation emitted by the human body. Which one of the following statements is true?

Which of the following rays are not electromagnetic waves ?

An equiconvex lens is cut into two halves along (i) XOX' and (ii) YOY' as shown in the figure. Let $$f,f',$$ $$f''$$

A charge q is located at the centre of a cube. The electric flux through any face is

J.J. Thomson's cathode-ray tube experiment demonstrated that

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force $$\overrig

Solar energy is mainly caused due to

The volume occupied by an atom is greater than the volume of the nucleus by a factor of about

The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of $${}_2^4$$

In which of the following systems will the radius of the first orbit (n = 1) be minimum ?

Reverse bias applied to a junction diode

Two spheres of masses m and M are situated in air and the gravitational force between them is F. The space around the ma

If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is

The vector sum of two forces is perpendicular to their vector differences. In that case, the forces

A particle moves along a circle of radius $$\left( {{{20} \over \pi }} \right)$$ m with constants tangential acceleratio

A man weight 80 kg. He stands on a weighting scale in a lift which is moving upwards with a uniform acceleration of 5 m

A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it bu

When a long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential e

A stationary particle explodes into two particles of masses m1 and m2 which move in opposite directions with velocities

A ball rolls without slipping. The radius of gyration of the ball about an axis passing through its centre of mass is K.

A stone is tied to a string of length $$l$$ and is whirled in a vertical circle with the other end of the string as the

A solid cylinder of mass M and radius R rolls without slipping down an inclined plane of length L and height h. What is

A thin circular ring of mass M and radius r is rotating about its axis with a constant angular velocity $$\omega $$. Fou

The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on planet B. A man jumps to a

A body of mass m is placed on earth's surface which is taken from earth surface to a height of h = 3R, then change in gr

Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and

An ideal gas heat engine operates in a Carnot cycle between 227oC and 127oC. It absorbs 6 kcal at the height temperature

Which one of the following statements is true for the speed v and the acceleration a of a particle executing simple harm

The potential energy of a simple harmonic oscillator when the particle is half way to its end point is

A particle of mass m oscillates with simple harmonic motion between points x1 and x2, the equilibrium position being O.

The time period of mass suspended from a spring is T. If the spring is cut into four equal parts and the same mass is su

In case of a forced vibration, the resonance peak becomes very sharp when the

Three capacitors each of capacity 4 $$\mu $$F are to be connected in such a way that the effective capacitance is $$6\mu

If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be

Barrier potential of a p-n junction diode does not depened on

A man throws balls with the same speed vertically upwards one after the other at an interval of 2 seconds. What should b