Sliding filament theory can be best explained as

What causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows?

Typical growth curve in plants is

When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?

Erythropoiesis starts in

Blood pressure in the mammalian aorta is maximum during

Which one of the following is correct?

Which of the following does not favour the formation of large quantities of dilute urine?

Removal of proximal convoluated tubule from the nephron will result in

Cytochromes are found in

Glenoid cavity articulates

Which of the following regions of the brain is incorrectly paired with its function?

A gymnast is able to balance his body upside down even in the total darkness because of

A chemical signal that has both endocrine and neural roles is

Which one of the following may require pollinators, but is genetically similar to autogamy?

Which of the following are the important floral rewards to the animal pollinators ?

Which one of the following statements is not true?

Transmission tissue is characteristic feature of

Capacitation refers to changes in the

Perigynous flowers are found in

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True nucleus is absent in

In which of the following, gametophyte is not independent free living?

Which one of the following statements is wrong?

Read the following five statements (A to E) and select the option with all correct statements. A.   Mosse

Male gametes are flagellated in

Which of the following endoparasites of humans does show viviparity?

Which of the following represents the correct combination without any exception?

Which of the following animals is not viviparous?

Which of the following characteristics is mainly responsible for diversification of insects on land?

Hysterectomy is surgical removal of

Keel is the characteristic feature of flower of

Leaves become modified into spines in

is the floral formula of

Which one of the following statements is incorrect?

A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has

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The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are

Cryopreservation of gametes of threatened species in viable and fertile condition can be referred to as:

A major characteristic of the monocot root is the presence of :

Vascular bundles in monocotyledons are considered closed because

The terga, sterna and pleura of cockroach body are joined by :

Nuclear envelope is a derivative of :

DNA is not present in :

In which of the following both pairs have correct combination ?

The chromosomes in which centromere is situated close to one end are :

Which one of the following is not an inclusion body found in prokaryotes?

Select the correct matching in the following pairs :

The hilum is a scar on the

The movement of a gene from one linkage group to another is called

Alleles are

Multiple alleles are present

How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offspri

An abnormal human baby with ‘XXX’ sex chromosomes was born due to

Which of the following cells during gametogenesis is normally diploid?

Which of these is not an important component of initiation of parturition in humans?

Which of the following is not a sexually transmitted desease?

Which of the following viruses is not transferred through semen of an infected male?

Gene regulation governing lactose operon of E.coli that involves the lac I gene product is

In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine, The percentages of the other th

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HIV that causes AIDS, first starts destroying

The active form of Entamoeba histolytica feeds upon

The guts of cow and buffalo possess

In Bt cotton, the Bt toxin present in plant tissue as pro - toxin is converted into active toxin due to :

The crops engineered for glyphosate are resistant/ tolerant to :

Which body of the Government of India regulates GM research and safety of introducing GM organisms for public services ?

The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for

Vertical distribution of different species occupying different levels in a biotic community is known as :

Secondary Succession takes place on/in :

The mass of living material at a trophic level at a particular time is called :

Most animals are tree dwellers in a:

In an ecosystem the rate of production of organic matter during photosynthesis is termed as :

Which of these statements about [Co(CN)6]3$$-$$ is true?

A mixture of gases contains H2 and O2 gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the

A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known

The reaction, is called

An organic compound 'X' having molecular formula C5H10O yields phenylhydrazone and gives negative response to the iodofo

The electrolytic reduction of nitrobenzene in strongly acidic medium produces

The boiling point of 0.2 mol kg$$-$$1 solution of X in water is greater than equimolal solution of Y in water. Which on

Which of them is not equal to zero for an ideal solution?

Which one of the following electrolytes has the same value of van't Hoff factor (i) as that of Al2(SO4)3 (if all are 100

The reaction of C6H5CH $$=$$ CHCH3 with HBr produces

The activation energy of a reaction can be determined from the slope of which of the following graphs?

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of th

Nitrogen dioxide and sulphur dioxide have some properties in common . Which property is shown by one of these compounds

Magnetic moment 2.84 B.M. is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in

Which of the following processes does not involve oxidation of iron?

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chl

Treatment of cyclopentanone with methyl lithium gives which of the following species ?

The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following ?

The angular momentum of electron in 'd' orbital is equal to

The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase ?

Which of the following options represents the correct bond order ?

The correct bond order in the following species is

Which of the following pairs of ions are isoelectronic and isostructural ?

Maximum bond angle at nitrogen is present in which of the following ?

The Ksp of Ag2CrO4,  AgCl,  AgBr  and Agl  are respectively, 1.1 $$ \times $$ 10$$-

Which of the following statements is correct for a reversible process in a state of equilibrium?

If the value of equilibrium constant for a particular reaction is 1.6 $$ \times $$ 1012, then at equilibrium the system

The total number of $$\pi $$-bond electrons in the following structure is

Given : Which of the given compounds can exhibit tautomerism?

Which of the following species contains equal number of $$\sigma $$- and $$\pi $$-bonds ?

Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K te

The enolic form of ethyl accetoacetate as shown below has

In which of the following compounds, the C$$-$$Cl bond ionisation shall give most stable carbonium ion?

Consider the following compounds : Hyperconjunction occurs in

A single compound of the structure, is obtainable from ozonolysis of which of the following cyclic compounds?

Given : The enthalpy of hydrogenation of these compounds will be in the order as

A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (

When two displacements represented by y1 = a sin$${\left( {\omega t} \right)}$$ and y2 = b cos$${\left( {\omega t} \righ

The electric field in a certain region is acting radially outward and is given by E = Ar. A charge contained in a sphere

A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielect

Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which

A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential differe

A potentiometer wire has length 4 m and resistance 8 $$\Omega $$. The resistance that must be connected in series with t

An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the cent

A conducting square frame of side 'a' and a long straight wire carrying current $$I$$ are located in the same plane as s

A wire carrying current $$I$$ has the shape shown in adjoining figure. Linear parts of the wire are very long and para

A resistance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resis

A particle is executing SHM along a straight line. Its velocities at distances x1 and x2 from the mean position are V1 a

For a parallel beam of monochromatic light of wavelength '$$\lambda $$' , diffraction is produced by a single slit whose

Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed

In a double slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wa

The refracting angle of a prism is A, and refractive index of the material of the prism is cot (A/2). The angle of minim

A certain metallic surface is illuminated with monochromatic light of wavelength, $$\lambda .$$ The stopping potential f

Which of the following figures represent the variation of particle momentum and the associated de-Broglie wavelength?

Consider 3rd orbit of He+ (Helium), using non-relativistic approach, the speed of electron in this orbit will be [given

Which logic gate is represented by the following combination of logic gates ?

If in a p-n junction, a square input signal of 10 V is applied, as shown, then the output across RL will be

A mass m moves in a circle on a smooth horizontal plane with velocity v0 at a radius R0. The mass is attached to a strin

A particle of unit mass undergoes one-dimensional motion such that its velocity varies according to $$v\left( x \right)

A ship A is moving Westwards with a speed of 10 km h$$-$$1 and a ship B 100 km South of A, is moving Northwards with a s

A block A of mass m1 rests on a horizontal table. A light string connected to it passes over a frictionless pully at the

Three blocks A, B and C, of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown.

A block of mass 10 kg, moving in x direction with a constant speed of 10 m s$$-$$1, is subjected to a retarding force F

A particle of mass m is driven by a machine that delivers a constant power k watts. If the particle starts from rest the

Two particles of masses m1, m2 move with initial velocities u1 and u2. On collision, one of the particles get excited t

Two similar springs P and Q have spring constants KP and KQ, such that KP > KQ. They are stretched first by the same

A rod of weight W is supported by two parallel knife edges A and B and is in equilibrium in a horizontal position. The k

Three identical spherical shells, each of mass m and radius r are placed as shown in figure. Consider an axis XX' which

Kepler's third law states that square of period of revoluation (T) of a planet around the sun, is proportional to third

Two spherical bodies of mass M and 5M and radii R and 2R are released in free space with initial separation between thei

The two ends of a metal rod are maintained at temperatures 100oC and 110oC. The rate of heat flow in the rod is found to

A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m2. Assuming that the pressu

On observing light from three different starts P, Q and R, it was found that intensity of violet colour is maximum in th

The approximate depth of an ocean is 2700 m. The compressiblity of water is 45.4 $$ \times $$ 10$$-$$11 Pa$$-$$1 and den

The ratio of the specific heats $${{{C_p}} \over {{C_v}}} = \gamma $$ in terms of degrees of freedom (n) is given by

A Carnot engine, having an efficiency of as heat engine, is used as a refrigerator. If the work done on the system is 10

Figure below shows two paths that may be taken by a gas to go from a state A to a state C. In process AB, 400 J of heat

One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure. The chang

If energy (E), velocity (V) and time (T) are chosen as the fundamental quantities, the dimensional formula of surface te