Megaspores are produced from the megaspore mother cells after

The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of

Select the option which shows correct matching of animal with its excretory organ and excretory product.

During muscle contraction in humans, the

Select the correct statement with respect to disorders of muscles in humans.

Select the option which correctly matches the endocrine gland with its hormone and its function.

Norepinephrine
(i)  is released by sympathetic fibres
(ii)  is released by parasympathetic fibers
(iii) increases the heart rate
(iv) decreases blood pressure.

Which of the above statements are correct?

Which of the following represents the action of insulin?

Animal vectors are required for pollination in

In our society women are blamed for producing female children. Choose the correct answer for the sex-determination in humans.

Which one of the following statements is correct?

Which of the following statements is correct?

The foetal ejection reflex in humans triggers the release of

Albuminous seeds store their reserve food mainly in

Which one is the incorrect statement with regards to the importance of pedigree analysis?

The stage transferred into the uterus after induced fertilization of ovum in the laboratory is

One of the following is not a method of contraception. Which one?

Down's syndrome in humans is due to :

The figure gives an important concept in the genetic implication of DNA . Fill the blanks A, B and C.

One of the most frequently used techniques in DNA fingerprinting is :-

Among flowers of Calotropis, tulip, Sesbania, Asparagus, Colchicum, sweet pea, Petunia, Indigofera, mustard, soybean, tobaco and groundnut, how many plants have corolla with valvate aestivation?

Syngamy can occur outside the body of the organism in

Which one of the following is wrongly matched?

Why is a capsule advantageous to a bacterium?

Which one of the following is true for fungi?

The plant body is thalloid in

Which one of the following animals is correctly matched with its one characteristic and the taxon?

Which one of the following groups of animals reproduces only by sexual means?

The characteristics of Class Reptilia are

Which one of the following is one of the paths followed by air or O₂ during respiration in the adult male Periplaneta americana it enters the animal body?

Sharks and dogfishes differ from skates and rays because

Which of the following is not a property of the genetic code ?

Inflorescence is racemose in

In a cymose inflorescence the main axis

How many plants among China rose, Ocimum, sunflower, mustard, Alstonia, guava, Calotropis and Nerium (oleander) have opposite phyllotaxy?

The figure shows a hypothetical tetrapeptide portion of a protein with parts labelled A - D. Which one of the following options is correct?

During the metaphase stage of mitosis, spindle fibres attach to chromosomes at

Uridine, present only in RNA is a

Which of the following statements about enzymes is wrong?

During meiosis I, the chromosomes start pairing at

Identify the tissue shown in the diagram and match with its characteristics and its location :-

When man eats fish which feeds on zooplankton which have eaten small plants, the producer in the chain is :

Which organization publishes the 'Red Data Book' ?

Which of the following has maximum genetic diversity in India?

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N₂) to the atmosphere ?

Bundle sheath cells :

Which of the following statements is not true for stomatal apparatus ?

Meristematic tissue responsible for increase in girth of tree trunk is :

Select the correct option with respect to Cockroaches :-

The largest tiger reserve in India is :-

The term 'glycocalyx' is used for :

A stage of mitosis is shown in the diagram.
Which stage is it and what are its characteristics?

Select the alternative giving correct identification and function of the organelle 'A' in the diagram

Which of the following best illustrates "FEEDBACK" in development ?

Which of the following types of plastids does not contain stored food material ?

A sagittal section of human brain is shown here. Identify at least two labels from A-D.

The figure shows a section of human ovary. Select the option which gives the correct identification of either A or B with function/ characteristic.

The figure shows blood circulation in humans with labels A to D. Select the option which gives correct identification of label and functions of the part.

The figure shows a human blood cell. Identify it and give its characteristics.

The figure shows an axon terminal and synapse. Select the option giving correct identification of labels A-D.

Which one of the following is a hallucinogenic drug?

Satellite RNA are present in some :

In an inducible operon, the genes are :

Genes of interest can be selected from a genomic library by using :

Random undirectional change in allele frequencies that occur by chance in all populations and especially in small populations is known as :-

Dinosaurs dominated the World in which of the following geological era ?

The finch species of Galapagos Islands are grouped according to their food sources. Which of the following is not a finch food ?

Genetic variation in a population arises due to :

Which one of the following statements is correct regarding Sexually Transmitted Diseases (STD) ?

Microbe used for biocontrol of pest butterfly caterpillars is :

What is common in all the three, Funaria, Dryopteris and Ginkgo?

Tissue culture technique can produce infinite number of new plants from a small parental tissue. The economic importance of the technique is in raising:

Which of the following statements is not true about somatic embryogenesis ?

Identify the site where Wuchereria bancrofti is normally found on human body :

During the process of isolation of DNA, chilled ethanol is added to :

RNA interference involves :-

The age pyramid with broad base indicates :

Which one of the following is not a parasitic adaptation ?

Benthic organisms are affected most by :

Which one of the following vectors is used to replace the defective gene in gene therapy ?

Which one of the following is a primary consumer in maize field ecosystem ?

The common characteristics between tomato and potato will be maximum at the level of their

According to law of photochemical equivalence the energy absorbed (in ergs/mole) is given as (h = 6.62 $$ \times $$ 10^$$-$$27 ergs, c = 3 $$ \times $$ 10¹⁰ cm s^$$-$$1, N_A = 6.02 $$ \times $$ 10^$$-$$23 mol^$$-$$1)

Some reactions of amines are given. Which one is not correct?

In DNA, the linkages between different nitrogenous bases are

On hydrolysis of a ''compound'', two compounds are obtained. One of which one treatment with sodium nitrite and hydrochloric acid gives a product which does not respond to iodoform test. The second one reduces Tollens reagent and Fehling's solution. The ''compound'' is

Which condition is not satisfied by an ideal solution?

For a reaction between A and B the order with respect to A is 2 and the other with respect to B is 3. The concentrations of both A and B are doubled, the rate will increase by a factor of

Consider the half-cell reduction reaction
Mn²⁺ + 2e^$$-$$ $$ \to $$ Mn, E^o = $$-$$1.18 V
Mn²⁺ $$ \to $$ Mn³⁺ + e^$$-$$, E^o = $$-$$ 1.51 V
The $$E$$^o for the reaction 3 Mn²⁺ $$ \to $$ Mn^o + 2Mn³⁺, and possibility of the forward reaction are respectively

A reaction is 50% complete in 2 hours and 75% complete in 4 hours. The order of reaction is

How many gram of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes (1 Faraday = 96,500 C; Atomic mass of Co = 59 u)

Which statement is wrong?

Identify the incorrect statement, regarding the molecule XeO₄ :

Number of isomeric alcohols of molecular formula C₆H₁₄O which give positive iodoform test is

Sc (Z = 21) is a transition element but Zn (Z = 30) is not because

In a particular isomer of [Co(NH₃)₄Cl₂]^o, the Cl$$-$$Co$$-$$Cl angle is 90^o, this isomer is known as

Which among the following is a paramagnetic complex?

The correct IUPAC name for [CrF₂(en)₂]Cl is

Crystal field splitting energy for high spin d⁴ octahedral complex is

Which is diamagnetic?

The anion of acetylacetone (acac) forms Co (acac)₃ chelate with Co³⁺. The rings of the chelate are

Three thermochemical equations are given below
(i)  C_(graphite) + O_2(g) $$ \to $$ CO_2(g); $$\Delta $$_rH^o = x kJ mol^$$-$$1
(ii)  C_(graphite) + $${1 \over 2}$$O_2(g) $$ \to $$ CO_(g); $$\Delta $$_rH^o = y kJ mol^$$-$$1
(iii)  CO_(g) + $${1 \over 2}$$O_2(g) $$ \to $$ CO_2(g); $$\Delta $$_rH^o = z kJ mol^$$-$$1
Based on the above equations, find out which of the relationship given below is correct.

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?

The outer electronic configuration of Gd (At. No. 64) is

In an experiment it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO₃, which of the following will be the formula of the chloriode (X stands for the symbol of the element other than chlorine)

The outer orbitals of C in ethane molecule can be considered to be hybridized to give three equivalent sp² orbitals. The total number of sigma $$\left( \sigma \right)$$ and pi $$\left( \pi \right)$$ bonds in ethane molecule is

In which of the following pair both the species have sp³ hybridization ?

The pair of species that has the same bond order in the following is

In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic.

When 5 litres of a gas mixture of methane and propane is perfectly combusted at 0^oC and 1 atmosphere, 16 litres of oxygen at the same temperature and pressure is consumed, The amount of heat released from this combustion in kJ ($$\Delta $$H_comb. (CH₄) = 890 kJ mol^$$-$$1, $$\Delta $$H_comb. (C₃H₈) = 2220 kJ mol^$$-$$1) is

Accumulation of lactic acid (HC₃H₅O₃), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociates. The value of dissociation constant, K_a, for this acid will be

The dissociation constant of weak acid is 1 $$ \times $$ 10^$$-$$4. In order to prepare a buffer solution with a pH = 5, the [Salt]/[Acid] ratio should be

Arrange the following in increasing order of stability

Homolytic fission of the following alkanes forms free radicals CH₃ $$-$$ CH₃, CH₃ $$-$$ CH₂ $$-$$ CH₃, (CH₃)₂CH $$-$$ CH₃, CH₃ $$-$$ CH₂ $$-$$CH(CH₃)₂.
Increasing order of stability of the radicals is

The values of K_sp of CaCO₃ and CaC₂O₄ are 4.7 $$ \times $$ 10^$$-$$9 and 1.3 $$ \times $$ $$-$$9 respectively at 25^oC. If the mixture of these two is washed with water, what is the concentration of Ca²⁺ ions in water ?

Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?

What is the hybridisation state of benzyl carbonium ion?

At 100^oC the K_w of water is 55 times its value at 25^oC. What will be the pH of neutral solution? (log 55 = 1.74)

In the following reaction :

Product 'P' will not give

Which of the following chemical system is non aromatic ?

Given :

I and II are

A parallel beam of light of wavelength $$\lambda $$ is incident normally on a narrow slit. A diffraction pattern formed on a screen placed perpenficular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is

A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to

An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90^o is

Two rods are joined end to end, as shown. Both have a cross-sectional area of 0.01 cm². Each is 1 meter long. One rod is of copper with a resistivity of 1.7 $$ \times $$ 10^$$-$$6 ohm-centimeter, the other is of iron with a resistivity of 10^$$-$$5 ohm-centimeter.

How much voltage is required to produce a current of 1 ampere in the rods?

A 12 cm wire is given a shape of a right angled triangle ABC having sides 3 cm, 4 cm and 5 cm as shown in the figure. The resistance between two ends (AB, BC, CA) of the respective sides are measuread one by one ratio

A long straight wire carries a certain current and produces a magnetic field 2 $$ \times $$ 10^$$-$$4 Wb m^$$-$$2 at a perpendicular distance of 5 cm from the wire. An electron situated at 5 cm from the wire moves with a velocity 10⁷ m/s towards the wire along perpendicular to it. The force experienced by the electron will be (charge on electron 1.6 $$ \times $$ 10^$$-$$19 C)

A circular coil ABCD carrying a current 'i' is placed in a uniform magnetic field. If the magnetic force on the segment AB is $$\overrightarrow F $$, the force on the remaining segment BCDA is

Ten identical cells connected in series are needed to heat a wire of length one meter and radius 'r' by 10^oC in time 't'. How many cells will be required to heat the wire of length two meter of the same radius by the same temperature in time 't' ?

An electromagnetic wave of frequency $$\upsilon = 3.0$$ MHz passes from vaccum into a dielectric medium with relative permittivity $${{\varepsilon _r}}$$ = 4.0. Then

The primary of a transformer when connected to a dc battery of 10 Volt draws a current of 1 mA. The number of turns of the primary and secondary windings are 50 and 100 respectively. The voltage in the secondary and the current drawn by the circuit in the secondary are respectively

A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is

The de-broglie wavelength of neutrons in thermal equilibrium at temperature T is

A bar magnet of magnetic moment M is placed at right angles to a magnetic induction B. If a force F is experienced by each pole of the magnet, the length of the magnet will be

In Young's double slit experiment the distance between the slits and the screen is doubled. The separation between the slits is reduced to half. As a result the fringe width

The reddish appearance of the sun at sunrise and sunset is due to

Two plane mirrors are inclined at 70^o. A ray incident on one mirror at angle, $$\theta $$ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of $$\theta $$ is

A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be V₀. If the distance between the light source and photo cell is made 25 cm, the new stopping potential will be :

How does the Binding Energy per nucleon vary with the increase in the number of nucleons ?

An electron in hydrogen atom makes a transition n₁ $$ \to $$ n₂ where n₁ and n₂ are principal quantum numbers of the two states . Assuming Bohr's model to be valid, the time period of the electron in the initial state is eight times that in the final state. The possible values of n₁ and n₂ are

The output from a NAND gate is divided into two in parallel and fed to another NAND gate. The resulting gate is a

In an unbiased p-n junction, holes diffuse from the p-region to n-region because of

One way in which the operation of a n-p-n transistor differs from that of a p-n-p

A fluid is in streamline flow across a horizontal pipe of variable area of cross section. For this which of the following statements is correct?

The displacement 'x' (in meter) of a particle of mass 'm' (in kg) moving in one dimension under the action of a force, is related to time 't' (in sec) by t = $$\sqrt x + 3$$. The displacement of the particle when its velocity is zero, will be

A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m/s. A bob is suspended from the roof of the car by a light wire of length 1.0 m. The angle made by the wire with the vertical is

A particle with total energy E is moving in a potential energy region U(x). Motion of the particle is restricted to the region when

Vectors $$\overrightarrow A ,\overrightarrow B $$ and $$\overrightarrow C $$ are such that $$\overrightarrow A .\overrightarrow B = 0$$ and $$\overrightarrow A .\overrightarrow C = 0$$. Then the vector parallel to $$\overrightarrow A $$ is

One coolie takes 1 minute to raise a suitcase through a height of 2 m but the second coolie takes 30 s to raise the same suitcase to the same height. The powers of two coolies are in the ratio

A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s. Each bullet has a mass of 10 g with a muzzle velocity of 800 m s^$$-$$1. The final velocity acquired by the person and the average force exerted on the person are :

The ratio of radii of gyration of a circular ring and a circular disc, of the same mass and radius, about an axis passing through their centres and perpendicular to their planes are

Two discs are rotating about their axes, normal to the discs and passing through the centres of the discs. Disc D₁ has 2 kg mass and 0.2 m radius and initial angular velocity of 50 rad s^$$-$$1. Disc D₂ has 4 kg mass, 0.1 m radius and initial angular velocity of 200 rad s^$$-$$1. The two discs are brought in contact face to face, with their axes of rotation coincident. The final angular velocity (in rad s^$$-$$1) of the system is

The radius of a planet is twice the radius of earth. Both have almost equal average mass densities. V_P and V_E are escape velocities of the planet and the earth, respectively, then

A particle of mass 'm' is kept at rest at a height 3R from the surface of earth, where 'R' is radius of earth and 'M' is mass of earth. The minimum speed with which it should be projected , so that it does not return back, is
(g is acceleration due to gravity on the surface of earth)

Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K₁ and K₂ and cross sectional areas A₁ and A₂, respectively. If the rate of heat conduction in 1 is four times that in 2, then

The density of water at 20^oC is 998 kg/m³ and at 40^oC is 992 kg/m³. The coefficient of volume expansion of water is

If the ratio of diameters, lengths and Young's modulus of steel and copper wires shown in the figure are p, q and s respectively, then the corresponding ratio of increase in their lengths would be

Which of the following relations does not give the equation of an adiabatic process, where terms have their usual meaning?

Two Carnot engines A and B are operated in series. The engine A receives heat from the source at temperature T₁ and rejects the heat to the sink at temperature T. The second engine B receives the heat at temperature T and rejects to its sink at temperature T₂. For what values of T the efficiencies of the two engines are equal

A system is taken from state a to state c by two paths adc and abc as shown in the figure. The internal energy at a is $${U_a} = 10\,J$$. Along the path adc the amount of heat absorbed dQ₁ $$=$$ 50 J and the work obtained dW₁ $$=$$ 20 J whereas along the path abc the heat absorbed dQ₂ = 36 J. The amount of work allong the path abc is

A particle of mass m oscillates along x-axis according to equation x = asin$$\omega $$t. The nature of the graph between momentum and displacement of the particle is

In a vessel, the gas is at pressure P. If the mass of all the molecules is halved and their speed is doubled, then the resultant pressure will be

The length of the wire between two ends of a sonometer is 100 cm. What should be the positions of two bridges below the wire so that the three segments of the wire have their fundamental frequencies in the ratio 1 : 3 : 5.

The pair of quantities having same dimensions is