Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when

Chromatophores take part in

In photosynthesis, the light-independent reactions take place at

Auxin can be bioassayed by

Name the pulmonary disease in which alveolar surface area involved in gas exchage is drastically reduced due to damage i

Which one of the following animals has two separate circulatory pathways?

Human urine is usually acidic because

Which of the following is not a function of the skeletal system?

Which of the following joints would allow no movements?

Destruction of the anterior horn cells of the spinal cord would result in loss of

In mammalian eye, the 'fovea' is the center of the visual field, where

Which one of the following hormones though synthesised elsewhere, is stored and released by the master gland?

Which one of the following hormones is not involved in sugar metabolism?

In angiosperms, microsporogenesis and mega-sporogenesis

Filiform apparatus is characteristic feature of

Cell wall is absent in

Which one is a wrong statement?

The structures that help some bacteria to attach to rocks and/or host tissues are

In which group of organisms the cell walls form two thin overlapping shells which fit together?

Select the wrong statement.

Pick up the wrong statement.

Choose the wrong statement.

Flowers are unisexual in

Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development ar

Metagenesis refers to

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is

The wheat grain has an embryo with one large, shield shaped cotyledon known as

Among China rose, mustard, brinjal, potato, guava, cucumber, onion and tulip, how many plants have superior ovary?

Axile placentation is present in

Roots play insignificant role in absorption of water in

Which of the following biomolecules does have a phosphodiester bond?

The chitinous exoskeleton of arthropods is formed by the polymerisation of

Arrange the following events of meiosis in correct sequence (i)  Crossing over (ii)  Synapsis (iii)

Golden rice is a genetically modified crop plant where the incorporated gene is meant for biosynthesis of -

The introduction of t-DNA into plants involves -

An association of individuals of different species living in the same habitat and having functional interactions is -

In which of the following interactions both partners are adversely affected?

Most animals that live in deep oceanic waters are -

During ecological succession :

In which of the following both pairs have correct combination?

The species confined to a particular region and not found elsewhere is termed as -

The cutting of DNA at specific locations became possible with the discovery of -

Read the different components from (1) to (4) in the list given below and tell the correct order of the components with

The body cell in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of -

The function of the gap junction is to -

Match the columns and identify the correct option. .tg {border-collapse:collapse;border-spacing:0;width:100%} .tg td{f

Cellular organelles with membranes are -

Which of the following structures is not found in a prokaryotic cell?

Which of the following are not membranebound ?

The imperfect fungi which are decomposers of litter and help in mineral cycling belong to

Identify the correct order of organisation of genetic material from largest to smallest :

Coconut water from a tender coconut is

Which one of the following fruits is parthenocarpic?

Male gametophyte in angiosperms produces

In human females, meiosis-II is not completed until

Ectopic pregnancies are referred to as

Which of the following events is not associated with ovulation in human life?

Which of the following layers in an antral follicle is acellular?

A childless couple can be assisted to have a child through a technique called GIFT. The full form of this technique is :

Which one of the following is not applicable to RNA?

Balbiani rings are sites of :

Satellite DNA is important because it :

If you suspect major deficiency of antibodies in a person, to which of the following would you look for confirmatory evi

Which of the following immunoglobulins does constitute the largest percentage in human milk?

Which of the following diseases is caused by a protozoan?

Grafted kidney may be rejected in a patient due to -

Match the following list of microbes and their importance - .tg {border-collapse:collapse;border-spacing:0;width:100%

The DNA molecule to which the gene of interest is integrated for cloning is called -

The name of complex ion, [Fe(CN)6]3$$-$$ is

The sum of coordination number and oxidation number of the metal M in the complex [M(en)2(C2O4)]Cl (where en is ethylene

The hybridization involved in complex [Ni(CN)4]$$2-$$ is (At. No. Ni = 28)

Number of possible isomers for the complex [Co(en)2Cl2]Cl will be (en = ethylenediamine)

Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration

Which of the following reaction(s) can be used for the preparation of alkyl halides?

The oxidation of benzene by V2O5 in the presence of air produces

Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by eliminatio

Which one of the following esters gets hydrolysed most easily under alkaline conditions?

The following reaction is known by the name

Method by which aniline cannot be prepared is

The number of structural isomers possible from the molecular formula C3H9N is

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following

What is the mole fraction of the solute in a 1.00 m aqueous solution?

The rate constant of the reaction A $$ \to $$ B is 0.6 $$ \times $$ 10$$-$$3 mol L$$-$$1 s$$-$$1. If the concentration

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence

The variation of the boiling points of the hydrogen halides is in the order HF > HI > HBr > HCl. What explains

Strong reducing behavior of H3PO2 is due to

The formation of the oxide ion, O2$$-$$(g) from oxygen atom requires first an exthermic and then an endothermic step as

Which of the statements given below is incorrect?

Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified

What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed?

What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solut

If Avogadro number NA, is changed from 6.022 $$ \times $$ 1023 mol$$-$$1 to 6.022 $$ \times $$ 1020 mol$$-$$1, this woul

The number of water molecules is maximum in

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium ? (At. no. Z = 22)

In which of the following pairs, both the species are not isostructural ?

Decreasing order of stability of O2, O2$$-$$, O2+ and O22$$-$$ is

The heat of combination of carbon to CO2 is $$-$$393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from ca

If the equilibrium constant for N2(g) + O2(g) $$\rightleftharpoons$$ 2NO(g) is K, the equilibrium constant for $${1 \o

Aqueous solution of which of the following compounds is the best conductor of electric current ?

Which one of the following pairs of solution is not an acidic buffer ?

Which of the following statements is not correct for a nucleophile?

Which of the following is not the product of dehydration of

2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

In the reaction with HCl, an alkene reacts in accordance with the Markovnikov's rule to give a product 1-chloro-1 methyl

The possible stereo-structures of CH3CHOHCOOH, which are optically active, are called

In an SN1 reaction on chiral centers, there is

A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magneti

A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz

4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at constant volume is 5.0 J K$$-$$1 mo

The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open a

A parallel plate air capacitor has capacity C, distance of separation between plates is d and potential difference $$V$$

If potential (in volts) in a region is expressed as V(x, y, z) = 6xy $$-$$ y + 2yz, the electric field (in N/C) at point

Two metal wires of identical dimensions are connected in series. If $$\sigma $$1 and $$\sigma $$2 are the conductivity o

A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has

A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E0 and a resistance

A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B. I

A particle is executing a simple harmonic motion. Its maximum acceleration is $$\alpha $$ and maximum velocity is $$\bet

A series R-C circuit is connected to an alternating voltage source. Consider two situations : (a)  When capac

An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be

The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong ?

At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between

A beam of light consisting of red, green and blue colours is incifent on a right angled prism. The refractive index of t

In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective

Two slits in Young's experiment have widths in the ratio 1 : 25. The ratio of intensity at the maxima and minima in the

Light of wavelength 500 nm is incifent on a metal with work function 2.28 eV. The de Broglie wavelength of the emitted e

A photoelectric surface is illuminated successively by monochromatic light of wavelength $$\lambda $$ and If the maximum

A nucleus of uranium decays at rest into nuclei of thorium and helium. Then

A force $$\overrightarrow F = \alpha \widehat i + 3\widehat j + 6\widehat k$$ is acting at a point $$\overrightarrow r

If vectors $$\overrightarrow A = \cos \omega t\widehat i + \sin \omega t\widehat j$$ and $$\overrightarrow B = \cos {{

The positions vector of a particle $$\overrightarrow R $$ as a function of time is given by $$\overrightarrow R $$ = 4si

Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius $${r \over 2}$$ and the lig

A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizo

Two particles A and B, move with constant velocities $$\overrightarrow {{v_1}} $$ and $$\overrightarrow {{v_2}} $$. At t

A ball is thrown vertically downwards from a height of 20 m with an initial velocity v0. It collides with the ground, lo

The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the d

On a frictionless surface, a block of mass M moving at speed v collides elastically with another block of same mass M wh

An automobile moves on a road with a speed of 54 km h$$-$$1. The radius of its wheels is 0.45 m and the moment of inerti

Point masses m1 and m2 are placed at the opposite ends of a rigid rod of length L, and negligible mass. The rod is to be

In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Ba

A remote-sensing satellite of earth revolves in a circular orbit at a height of 0.25 $$ \times $$ 106 m above the surfac

A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the

The value of coefficient of volume expansion of glycerin is 5 $$ \times $$ 10$$-$$4 K$$-$$1. The fractional change in th

The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of

Water rises to a height h in capillary tube. If the length of capillary tube above the surface of water is made less tha

The Young's modulus of steel is twice that of brass. Two wires of same length and of same area of cross section, one of

An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in th

The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is $$-$$20oC, the temperature o

Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B.

In the given figure, a diode D is connected to an external resistance R = 100 $$\Omega $$ and an e.m.f. of 3.5 V. If the

If dimensions of critical velocity $$\upsilon $$c of a liquid flowing through a tube are expressed as $$\left[ {{\eta ^x