A device which converts electrical energy into mechanical energy is
Continuous emission spectrum is produced by
Three condenser of capacity C each are joined first in series and then in parallel. The capacity becomes n times, where n is
A ball is dropped from a height h to the ground. If the coefficient of restitution is 'e' the height to which the ball goes up after it rebounds for nth time is
Two resistors whose value are in ratio 2 : 1 are connected in parallel with one cell. Then ratio of power dissipated is
If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same
What will be the ratio of de-Broglie wavelengths of proton and α− particle of same energy
The pH of the mixture obtained when equal volumes of N/10 NaOH and N/20 HCI are mixed, is
An electron of charge 'E' is liberated from a hot filament and attracted by an anode of potential 'V' volts positive with respect to the filament. The speed of the electron of mass m when it strikes the anode is
The working of a dynamo is based on principle of
If the no. of turns of a solenoid are doubled and its length is halved keeping the area of cross-section same, then ratio of initial and final self-inductances will be
An L.C. circuit contains 10 mH inductor and a 25 μF capacitor. The resistance of the circuit is negligible. The energy stored in the circuit is completely magnetic at time (in milli seconds) being measured from the instant when the circuit is closed
In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is
The fact that radiosignals reach the earth from outside the atmosphere, was discovered accidently by
There is an electric field E in x-direction. If the work done on moving a charge of 0.2 C through a distance of 2 m along a line making an angle 60° with x-axis is 4 J, then what is the value of E?
An electric dipole is kept in a uniform electric field. It experiences
If the linear momentum is increased by 50%, the kinetic energy will increase by
Two bodies of mass m₁ and m₂ have equal kinetic energies. If p₁ and p₂ are their respective momentum, then ratio p₁ : p₂ is equal to
Two circular discs A and B with equal radii are blackened. They are heated to same temperature and are cooled under identical conditions. What inference do you draw from their cooling curves?
A ferromagnetic material is heated above its Curie temperature. Which one is a correct statement ?
Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 V a.c., supply line. The power drawn by the combination in each case respectively will be
The magnetic lines of force inside a bar magnet
According to the Hooke's law, if stress is increased, then ratio of stress to strain
An object with a mass of 10 kg moves at a constant velocity of 10m/s. A constant force then acts for 4 sec on the object and gives it a speed of 2m/sec in opposite direction. The acceleration produced in it is,
In radioactive decay, the emitted electrons come from
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): When light goes from a medium of refraction index 1.5 to a medium of refraction index, 1.6, its speed decreases by 1.875 * 108 m/s.
Reason(R): Refraction index = speed of light in vacuum speed of light in air
One of the two clocks on the earth is controlled by a pendulum and other by a spring. If both the clocks are taken to the moon, then which clock will have same time period as that on the earth?
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): A steady current flows in a metallic coductor of non-uniform cross-section. Only drift a speed remains constant along the length of the conductor.
Reason(R): vs = one A (symbols have their usual meaning).
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Nuclei having number about 60 are most stable.
Reason(R): When two or more light nuclei are combined into a heavier nucleus, then the binding energy per nucleon will increase.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Pendulum of a clock is made of alloys and not of pure metals.
Reason(R): Use of alloys make the pendulum look good.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Water at 4oC will overflow from a filled container both on heating as well cooling.
Reason(R): Process of regelation is responsible for the expansion of water at 4oC.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Two parallel wires carrying current in the same direction attract each other.
Reason(R): Two similar charges moving parallel to each other in same direction repel each other.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): For stable equilibrium, Force has to be zero and potential energy should be minimum.
Reason(R): For equilibrium, it is not necessary that the force is not zero.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Frictional forces are conservative.
Reason(R): Potential energy can be associated with frictional forces.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Thermistor is a device to detect small change in temperature.
Reason(R): The magnitude of the temperature coefficient of resistivity is often quite large for semiconducting material.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Current is passed through a metallic wire heating it red. When cold water is poured on half of its portion, the rest of half portion becomes more hot.
Reason(R): Resistance decreases due to decrease in temperature and then current through wire increases.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): If the string of a descending lift is broken, then it will fall down like a free body.
Reason(R): The acceleration of a free body is always 'g'.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): If a body is not in rest position then the net external force acting on it cannot be zero.
Reason(R): If a body is moving with uniform speed it will continue doing so unless frictional force exceeds the force of motion.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Nuclear fission is the basis of a hydrogen bomb.
Reason(R): Fission bomb is much more powerful and destructive than the fission bomb.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Radioactive substances emit both α and β-particles simultaneously.
Reason(R): Any radioactive substance does not have a single element only, but all those elements which are being formed by radioactive emission are present in it.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): When charges are shared between two bodies, there occurs loss of energy.
Reason(R): In case of sharing of charges, conservation of energy fails.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): β-particles are those electrons that were revolving around the nucleus of the atom.
Reason(R): β-particles have the same charge as that of electron.
If the de Broglie wavelengths for a proton and for a α-particle are equal, then the ratio of their velocities will be
The drift velocity of the electron is doubled if the applied electric field across the conductance is halved.
Reason(R): Drift velocity ∝ 1 Electric field
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Hot wire instrument is based on the principle of heating effect of current.
Reason(R): Only A.C. can be measured by hot-wire instrument.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The principle of homogeneity of dimensions state that dimensions on both sides of equation must be same
Reason (R) : An equation which is dimensionally correct is also practically correct
An electric motor creates a tension of 4500 newton in a hoisting cable and reels it in at the rate of 2 m/sec. What is the power of electric motor
If intensity of incident light is increased in PEE then which of the following is true
According to Einstein's photoelectric equation, the plot of the kinetic energy of the emitted photoelectrons from a metal versus frequency of the incident radiation gives a straight line, whose slope
The working of a dynamo is based on principle of
A particle reaches its highest point when it has covered exactly one half of its horizontal range. The correspponding point on the displacement time graph is characterised by
Doping of a semiconductor (with small traces of impurity atoms) generally changes the resistivity as follows:
In an unbiased p-n junction, holes diffuse from the p-region to n-region because
In an unbiased p-n junction, hole concentration in p-region is more than in n-region and due to difference in concentration of charge carriers, holes diffuse from p-region to n-region.
The neutral temperature is the mean of the temperatures of
The study of forces and their effect on the objects is studied under
Unit of stress are
What is the effect on the interference fringes in a Young's double slit experiment, if the monochromatic source is replaced by another monochromatic source of shorter wavelength?
Soap bubble looks coloured due to
Two coherent light beams of intensity I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are
A car travelling at a speed of 30 km/hr is brought to a halt in 8 m by applying brakes. If the same car is travelling at 60 km/hr, it can be brought to a halt with the same braking force in
Which of the following processes is employed to convert alkyl halide into alcohol?
A solution of 10 mL of M/10 FeSO₄ was titrated with KMnO₄ solution in acidic medium, the amount of KMnO₄ used will be
The hydrogen phosphate of certain metal has formula MHPO₄. The formula of metal chloride would be
Which of the following is formed when toluene reacts with a mixture of concentrated nitric acid and concentrated sulphuric acid?
The ortho/para directing group among the following is
In graphite, the electrons are
The most reactive compound for electrophilic nitration is
Freon is used as a
Among the following compounds, which has a dipole moment greater than zero?
Which of the following statements about the catalyst is true?
The order of reaction is decided by
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Hydrometallurgy and pyro-metallurgy is essentially same.
Reason(R): Both involve heating With water.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Magnetic moment value for copper (II) acetate is less than that for one unpaired electron.
Reason(R): Interaction between unpaired electrons belonging to different copper atoms occurs via bridging acetate group.
Calculate Δ H in KJ for the following reaction Cs + O2g → CO2g Given that
H2Og + Cg → COg + H2g , ΔH = + 131 kJ
COg + 12O2g → CO2g , ΔH = − 282 kJ
H2g + 12O2g → H2Og , ΔH = − 242 k J
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): If two moles of AgNO3 and 2 moles Cu are reacted , then AgNO3 is the limiting reactant.
Reason(R): AgNO3 is left in excess and copper is consumed fully.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Critical temperature is the temperature at which the real gas exhibits ideal behaviour for considerable range of pressure.
Reason(R): At critical temperature, the densities of a substance in gaseous and liquid states are same.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A):But-2-ene shows geometrical isomerism but but-1-ene does not show.
Reason(R):Geometrical isomersim arises due to the restricted rotation of the double bond.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): [CO(en)3]Cl3 complex is more stable than [CO(NH3)6]Cl3 complex.
Reason(R): Ethylenediamine is a bidentate ligand.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Molarity is a convenient concentration unit.
Reason(R): Number of moles of solution can be calculated with ease No.of moles = Volume of solution Moles of solution 1L solution
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): A mixture of the solutions of a weak acid and its sodium salt acts as a good buffer.
Reason(R): The ratio of the sale to acid in the mixture does not change substantially when small amounts of acids or alkalies are added to the buffer.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Al forms [AIF6]3- but B does not form [BF6]3-.
Reason(R): B does not react with F2.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Black body radiation and photoelectric effect were limitations of electromagnetic wave theory.
Reason (R): Planck's quantum theory explained them.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The ease of dehydration of alcohols follows the order. Primary>Secondary>Tertiary.
Reason(R): Dehydration proceeds through the formation of oxonium ions.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): CH3COOH but not HCOOH can be halogenated in presence of red P and Cl2.
Reason(R): Both formic acid and CH3COOH are highly soluble in water.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Ethyl xanthate is used as a collector in floatation process.
Reason(R): Collectors depress the floatation property of one of the components of the ore and thus help in the separation of different minerals present in the same ore.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The rest mass for electron is 0.0005486 u.
Reason (R): Electron is assumed moving while calculating rest mass.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Acetic acid in vapour state shows a molecular mass of 120.
Reason(R): It undergoes intermolecular hydrogen bonding.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Aniline is stronger base than ammonia.
Reason(R): In aniline electron density decreases at nitrogen due to mesomeric effect.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Trans[Co(en)2Br2]Cl does not show optical activity.
Reason(R): Above coplex can exhibit ionisation isomerism.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Valcanisation depends upon the amount of sulphur used.
Reason(R): Vulcanisation involves cooling of rubbers.
The e.m.f. of a galvanic cell with electrode potentials of silver equal to + 0.80 V and that of copper equal to + 0.34 V is
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Soap and detergent are macro-molecular colloids.
Reason(R): Soap and detergent are molecules of large size.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Methyl isocyanide can be hydrolysed by acids but not by alkalies.
Reason(R): The carbon atom of isocyanide group in methyl isocyanide carries a negative charge which readily accepts the proton but repels the OH- ion.
Which one of the following types of Laser is used in Laser Printers?
The molecular weight of methane is 16. If the pressure of this gas changes from 1 atm to 2 atm, then volume occupied by 1.6 g of this gas will be
Sodium burns in air and gives
An aqueous solution of sodium carbonate is alkaline because sodium carbonate is a salt of
Which of the following compounds is used in gun powder?
Which one of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at 90oC?
The solubility AgCl will be minimum in
Neutralization reaction in water is best represented by
The concept that acid is proton donor and base is proton acceptor was given by
A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame no distinctive colour is noted, which cation would be present?
Which of the following solution cannot act as a buffer ?
The percentage by weight of hydrogen in H₂O₂ is
Clemmensen reduction of a ketone is carried out in presence of
The addition of HBr to alkenes in the presence of peroxides is called :
Reduction with aluminium isopropoxide in excess of Isopropyl alcohol is called Meerwein Ponndroff-Verley reduction. What will be the final product when cyclohex-2-enone is selectively reduced in MPV reaction ?
Which gives more stable product ?
Which does not contain conjugate system?
In dienes, when the double bonds connected to each other by a single bond, this arrangement is known as conjugated.
Which is not the resonance structure of aniline?
Ultra-silicon is prepared by the process of
Which type of glass has a property to cut off ultra-violet rays?
Which one of the following solutions would produce maximum elevation in B.P. ?
Schottky defect is observed in the crystal of
One of the following is false for Hg?
The ratio of the value of any colligative property for KCl solution to that of sugar solution is nearly
Which of the following 0.10 m aqueous solutions will have lowest freezing point ?
Geometric isomerism will be exhibited by
In this compound both the carbon atoms bonded by the double bond have two different group attached to them
If 30 g of Mg and 30 g of oxygen are reacted, then the residual mixture contains
Ligament connects
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Thick cuticle is mostly present in disease resistant plants.
Reason(R): Disease causing agents cannot grow on cuticle and cannot invade the cuticle.
The transformation of cellulose or pectic substances of the primary or secondary wall into cutin, which forms a continuous layer, called the cuticle. It generally forms the skin or outermost covering of the stem, leaves and some fruits. A thick cuticle layer serves as a barrier against fungal disease. Cuticle play a structural barrier and it contain substances of high wax content which the fungus finds difficult to penetrate.
Pneumatic bones, four chambered heart and feathers occur in
Eggs of Anopheles are found
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Severe Acute Respiratory Syndrome (SARS) originated in China.
Reason(R): China is the most poulated country of the world.
Severe Acute Respiratory Syndrome (SARS) a severe acute type of pneumonia caused by metapneumo virus was first reported in China.
Though China is the most populated country of the world it is not directly responsible for the origin of SARS. The killer pneumonia virus is responsible for SARS origin.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Endomycorrhiza of forest trees contribute to the efficient nutrient cycling in tropical forest ecosystems.
Reason(R): The fungi that form endomycorrhizal associations with plants store nutrient ions and make them available to the host plants.
The fungi of endotrophic mycorrhiza invade the cells of the root cortex, with a portion lying externally as a loose mass of hyphae in the soil. These mycorrhizas are found in the families of Ericales, Orchidaceae and Gentiaceae. Mycorrhizas cause considerable stimulation to groth in nutrient deficient soils.The greatest stimulation occurs in the uptake of phosphates. Mycorrhizas can take up phosphate at that low concentrations at which they are unavailable to non-mycorrhizal roots.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Adenine cannot pair with cytosine.
Reason(R): Because there would be two hydrogen atoms one at the bonding positions and one at the other.
The purine and pyrimidine bases pair only in certain combinations. Adenine pairs with thymine (A:T) and guanine with cytosine (G:C). Adenine and thymine are joined by two hydrogen bonds ( A ═ T ) Cytosine and guanine are joined by three hydrogen bonds ( G ≡ C ) through positions 6', 1' and 2'.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Extra whorl of calyx is called epicalyx.
Reason (R): Epicalyx is present as inner series of calyx.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): WBCs accumulate at the site of wounds by diapedesis.
Reason(R): It is the squeezing of leucocytes from the endothelium.
During a wound germs are removed by the process of phagocytosis by WBCs. WBCs accumulate at the site of wound by diapedesis. Diapedesis is the sqeezing of leucocytes out from the endothelium of capillaries to fight against foreign agent.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Generally the intraspecific competition is more intense than interspecific competition.
Reason (R): Intraspecific competition occurs when the resources are in short supply.
In the following questions, a statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the statements carefully and mark the answer-
Assertion (A): Leucoplasts give rise to other types of plastids.
Reason (R): Chromoplasts do not get changed to other types of plastids.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): In a food chain members of successive higher levels are fewer in number.
Reason(R): Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.
In a parasitic food chain the pyramids are always inverted. This is due to the fact that a single plant may support the growth of many herbivores and each herbivore in turn may provide nutrition to several parasites there is a reverse position, which means the number of organisms gradually show an increase.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Ionizing radiations are harmful for the living organism.
Reason(R): They form toxic photoproducts in the cells.
The ionizing radiations can have direct effect on chromosomes. They may directly break chromosomes or alter one of the DNA bases or indirectly may initiate a chain of chemical reactions. The biological effect also depends on the kind of cell and stage of nuclear cycle.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): The main function of suspensor is to provide nutrition to embryo.
Reason (R): It is attached to embryo by hypophysis.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): In alcoholic drink, the alcohol is converted into glucose in the liver.
Reason(R): Liver cells are able to produce glucose from alcohol by back fermentation.
Absorbed alcohol is carried directly to the liver, where it becomes the preferred fuel. Use of moderate amounts of alcohol does not cause liver damage provided adequate nutrition is maintained. The liver becomes enlarged yellow greasy and firm.Hepatocytes are distended by large fat globules which push the hepatocyte nucleus against the cell membrane. Accumulation of fat in the liver of the alcoholic person results from the combination of impaired fatty acid oxidation, increased uptake and esterification of fatty acids to form triglycerides and diminshed lipoprotein biosynthesis and secretion, it means there is increase in the fat synthesis in the liver.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Cytochromes are only found in mitochondria.
Reason (R): Cytochrome b 5 occurs in the endoplasmic reticulum.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Study of biology requires basic knowledge of chemistry and physics.
Reason(R): Living organisms are made up of atoms and molecules which follow chemical and physical laws.
The field of biology is getting advanced day by day to such an extent that basci knowledge of physics, chemistry and other sciences is necessarily required.All the living organisms are made up of atoms and molecules which follow certain laws associated with them. Therefore it becomes essential to have the knowledge of chemical and physical sciences also.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Old age is not an illness. It is a continuation of life with decreasing capacity for adaptation.
Reason(R): Cessation of mitosis is a normal genetically programmed event.
Old age is the result of ageing or senescence which may be defined as the progressive deterioration in structure and function of the body cells, tissues, organs and organ systems of the organism with their advancing age.In old age the body's immune system loses its ability to effectively deal with the antigens. This reduces the resistance as well as adaptation of the body.
Cessation of mitosis is not as such a genetically programmed event. During ageing, there is a decrease in multiplication of cells though it differs in various tissues.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Piper nigrum shows the presence of perisperm.
Reason (R): The persistent nucellus is called perisperm.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Pollution is always caused by human activites.
Reason(R): Pollution is not different from contamination.
Pollution is an undesirable change in thephysical, chemical or biological characteristics of our air, water and land that may or will harmfully affect human lives or other organism. Pollution can be natural or man made. Natural pollution comes from volcanic reuptions, emission of natural gas, soil erosion, ultraviolet rays, etc. Most of the pollution is man-made. Contamination occurs due to the presence of harmful organisms or their porducts or undesirable porducts in a desirable product causing disease or discomfort, for the organism who consume it. Therefore pollution and contamination are two different things.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): DNA code is not copied in the synthesis of transfer RNA.
Reason(R): Transfer RNA move out of the nucleus and after attaching on the ribosomes, form the template.
tRNA is synthesized in the nucleus as a DNA template. Only 0.025% of DNA codes for tRNA. tRNA is an exception to other cellular RNAs in that a part of its ribonucleotide sequence (-CCA) is added after it comes off the DNA template tRNA is formed from only a small part of DNA molecule. Therefore, it does not show any obvious base relationship to DNA.
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Natural germination inhibitors do not affect the viability of seeds.
Reason (R): Natural germination inhibitors may be found inside as well as outside of the seed.
In the following question, a statement of Assertion(A) is given followed by a corresponding statement of Reason(R).
Read the statements carefully, and mark the correct answer.
Assertion(A): Our body secretes adrenaline in intense cold.
Reason(R): Adrenaline raises metabolic rate.
Adrenalin is a catecholamine hormone,a lso known as epinephrine, secreted by the mammalian adrenal medulla as well as the adrenergic nerve endings. Its secretion is stimulated by the sympathetic nervous system under conditions of stress.
Adrenaline stimulates blood flow to skeletal muscles and increases blood glucose levels. It also raises metabolic rate.
Cellulose occurs in
R.Q. is more than one in case of-
Which of the following can fix atmospheric nitrogen?
Nucleotide on hydrolysis does not give :
The function of the nodes in the lymphatic system is to
Which of the following are liver waste products?
The flax fibres are obtained from
A gene which synthesises a repressor protein is
Which one is correct
Manipulation of DNA in genetic engineering became possible due to the discovery of
Cocaine is obtained from
Red:Pink:white is an example of
In Drosophilia the XXY constitution determines
Humoral immunity is due to
Some bacteria are not easily killed because of
Segments of antigen that are recognised by antibody are
In cyathium the ratio between female to male flowers is
Resistance against disease is provided by
Rh factor is named after
Sulphur is absorbed by plants as
Main substance involved in transfer of electrons in photosynthesis is
The law of limiting factors for photosynthesis was enunciated by
The scientist to isolate streptomycin for the first time is
The speed of a nerve impulse along a sensory neuron depends on the
Mule is product of
Basic difference between vessel and tracheid is in
Sclereids belong to
Minamata and itai-itai are caused by pollution of
In angiosperms, endosperm is formed by