Bulk of carbon dioxide (CO2) released from body tissues into the blood is present as

Common cold is not cured by antibiotics because it is :

Which one of the following options gives the correct matching of a disease with its causative organism and mode of infec

The unequivocal proof of DNA as the genetic material came from the studies on a :

Test cross in plants or in Drosophila involves crossing :

Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child ?

The technique called gamete intrafallopian transfer (GIFT) is recommended for those females :

What happens during fertilization in humans after many sperms reach close to the ovum?

About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH-surge) normally occurs

What is common between vegetative reproduction and apomixts?

In angiosperms, functional megaspore develops into

The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone

The type of muscles present in our

Uricotelic mode of excreting nitrogenous wastes is found in

Given below is the ECG of a normal human. Which one of its components is correctly interpreted below?

Read the following statement having two blanks (A and B) : ''A drug used for ______ (A)___ patients is obtained from a s

Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?

In mitochondria, protons accumulate in the

In kranz anatomy, the bundle sheath cells have

At metaphase, chromosomes are attached to the spindle fibres by their

Which one of the following pairs is wrongly matched while the remaining three are correct?

Sweet potato is homologous to

Whorled, simple leaves with reticulate venation are present in

Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are corr

Consider the following four statements (A$$-$$D) related to the common frog Rana tigrina, and select the correct option

Ureters act as urinogenital ducts in

Some vascular bundles are described as open because these :

Which one of the following is essential for photolysis of water?

The figures (A – D) show four animals. Select the correct option with respect to a common characteristic of two of these

Which one of the following figures represents the placentation in Dianthus?

Examine the figure given below and select the correct option giving all the four parts (A, B, C and D) rightly identifie

The figure below shows the structure of a mitochondrion with its four parts labelled (A), (B), (C). and (D) Select the p

Which one of the following is not considered as a part of the endomembrane system ?

Which one of the following structure in pheretima is correctly matched with its function ?

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

Frogs differ from humans in possessing :

Function of companion cells is :

Consider the following four statements whether they are correct or wrong. A.   The sporophyte in liverwo

Biodiversity of a geographical region represents :

Consider the following statements (A)-(D) each with one or two blanks : (A) Bears go into _____ (1) ____ during winter t

The breakdown of detritus into smaller particles by earthworm is a process called

Both, hydrarch and xerarch successions lead to :

Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time ?

The logistic population growth is expressed by the equation :

Read the following four statements (A-D) about certain mistakes in two of them : (A) The first transgenic buffalo, Rosie

Silencing of mRNA has been used in producing transgenic plants resistant to :

Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein :

Which one of the following techniques made it possible to genetically engineer living organisms ?

Consider the following statements (A-D) about organic farming : (A) Utilizes genetically modified crops like Bt cotton

Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are co

Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because

The pathogen Microsporum responsible for ringworm disease in humans belongs to the same kingdom of organisms as that of

Which one of the following aspects is in exclusive characteristics of living things?

Which of the following complex compounds will exhibit highest paramagnetic behaviour? (At. No. Ti = 22, Cr = 24, Co = 2

Which of the following carbonyls will have the strongest C–O bond ?

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correc

Which has the maximum number of molecules among the following ?

According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energe

Which of the following is not a fat soluble vitamin?

Which of the following oxide is amphoteric?

Which of the following statements is incorrect?

The unit of rate constant for a zero order reaction is

The half-life of a substance in a certain enzyme-catalysed reaction is 138 s. The time required for the concentration of

The rate of the reaction :   2N2O5 $$ \to $$ 4NO2 + O2 can be written in three ways. $${{ - d\left[ {{N_2}{O_

A solution contains Fe2+, Fe3+ and I$$-$$ ions. This solution was treated with iodine at 35oC. Eo for Fe3+/Fe2+ is + 0.

A 0.1 molal aqueous solution of a weak acid is 30% ionized. If Kf for water is 1.86oC/m, the freezing point of the solut

200 mL of an aqueous solution of a protein contains its 1.26 g. The osmotic pressure of this solution at 300 K is found

Which of the statements about ''Denaturation'' given below are correct? (1)  Denaturation of proteins causes

What of the following compounds is most basic?

The order of reactivity of phenyl magnesium bromide (PhMgBr) with the following compounds:

An organic compound A on treatment with NH3 gives B, which on heating gives C. C when treated with Br2 in the presence o

Match the compounds given in List-I with List-II and select the suitable option using the code given below. .tg {bord

Consider the reactions. The mechanisms of reactions (i) and (ii) are respectively

The IUPAC name of the following compound is

Which of the following compounds undergoes nucleophilic substitution reaction most easily?

In qualitative analysis, the metals of group I can be separated from other ions by precipitating them as chloride salts.

Consider the following processes : .tg {border-collapse:collapse;border-spacing:0;border:none;} .tg td{font-family:Ari

Which of the following structures is the most preferred and hence of lowest energy for SO3?

What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

A thermocouple of negligible resistance produces an e.m.f. of 40 µV/ºC in the linear range of temperature. A galvanomete

A galvanometer of resistance, G, is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, th

Pure Si at 500 K has equal number of electron (ne) and hole (nh) concentrations of 1.5 $$ \times $$ 1016 m$$-$$3. Doping

In the following figure, the diodes which are forward biased, are

A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in figure. The curre

Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's

An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a

The threshold frequency for a photosensitive metal is 3.3 $$ \times $$ 1014 Hz. If light of frequency 8.2 $$ \times $$ 1

A thin prism of angle 15o made of glass of refractive index $$\mu $$1 = 1.5 is combined with another prism of glass of r

A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point

A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is

The r.m.s. value of potential difference V shown in the figure is

A short bar magnet of magnetic moment 0.4 J T$$-$$1 is placed in a uniform magnetic field of 0.16 T. The magnet is in st

A square loop, carrying a teady current $$I$$, is placed in a horizontal plane near a long straight conductor carrying a

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

In the circuit shown in the figure, if the potential at point A is taken to be zero, the potential at point B is

Three charges, each +q, are placed at the corners of an isosceles triangle ABC of sides BC and AC, 2$$a$$. D and E are t

The electric potential V at any point (x, y, z), all in metres in space is given by V = 4x2 volt. The electric field at

Two identical piano wires, kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase

Two particles are oscillating along two close parallel straight lines side by side, with the same frequency and amplitud

A mass of diatomic gas $$(\gamma = 1.4)$$ at a pressure of 2 atmospheres is compressed adiabatically so that its temper

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

A particle of mass m is thrown upwards from the surface of the earth, with a velocity u. The mass and the radius of the

A small mass attached to a string rotates on a frictionless table top as shown. If the tension in the string is increase

A mass m moving horizontally (along the x-axis) with velocity $$v$$ collides and sticks to a mass of 3m moving verticall

A conveyor belt is moving at a constant speed of 2 ms$$-$$1. A box is gently dropped on it. The coefficient of friction

A projectile is fired at an angle of 45o with the horizontal. Elevation angle of the projectile at its highest point as

A particle covers half of its total distance with speed v1 and the rest half distance with speed v2. Its average speed d

The density of a material in CGS system of units is 4 g cm$$-$$3. In a system of units in which unit of length is 10 cm