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Study the four statements (A – D) given below and select the two correct ones out of them.
- Definition of biological species was given by Ernst Mayr.
- Photoperiod does not affect reproduction in plants.
- Binomial nomenclature system was given by R.H. Whittaker.
- In unicellular organisms, reproduction is synonymous with growth.
The two correct statements areCorrectIncorrect
Photoperiod affects flowering and reproduction in plants. Binomial nomenclature system was given by Carolus Linnaeus.
Which one of the following is not a correct statement?CorrectIncorrect
As we go from species to kingdom in a taxonomic hierachy, the number of common characteristicsCorrectIncorrect
The system of classification based on evolutionary and genetic relationships among organisms, ignoring the morphological similarities or differences, is calledCorrectIncorrect
Taxonomic key is one of the taxonomic tools in the identification and classification of plants and animals. It is used in the preparation ofCorrectIncorrect
Which of the following components provides sticky character to the bacterial cell?CorrectIncorrect
Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?CorrectIncorrect
Fungi are filamentous with the exception of “X” which is unicellular. Identify X.CorrectIncorrect
The figure below shows the structure of a bacteriophage. Identify its parts labelled as A, B, C and D.CorrectIncorrect
Incorrect statement about “Fungi imperfecti” is :CorrectIncorrect
(i) Green algae occur in fresh water, brackish water, salt water.
(ii) Habitat of Brown algae-fresh water (rare), brackish water, salt water
(iii) Some red algae are found in fresh water, mostly occur in salt water, some are in brackish water.
(iv) Most of the red algae are multicellular.
(v) Red alga may occur in both well lighted regions close to water-surface and also at great depths in oceans where light penetration is little.
(vi) Cell wall of red algae consists of cellulose + agar.
(vii) 2 – 8, equal and apical flagella in green algaeCorrectIncorrect
If a cell A with D.P.D. 4 bars is connected to cell B, C, D whose O.P. and T.P. are respectively 4 and 4, 10 and 5 and 7 and 3 bars, the flow of water will beCorrectIncorrect
In which method of transport in plasma membrane does not require carrier molecule?CorrectIncorrect
Which of the following facilitates opening of stomatal aperture?CorrectIncorrect
. Based on Munch’s pressure-flow hypothesis, which of the following conditions would increase the rate of translocation?CorrectIncorrect
A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?CorrectIncorrect
In part A of a plant, sugars are actively transported into the phloem tissue. In part B, sugars are actively transported out of the phloem. Which way will the phloem sap move under these conditions?CorrectIncorrect
Study the following statements.
- “X” hormone promotes root growth and root hair formation thus helping the plants to increase their absorption surface.
- “Y” hormone induces flowering in mango and also promotes rapid internode/petiole elongation in deep plants and hence helping leaves or upper parts of shoot above water
- “Z” hormone inhibits the seed germination, increase the tolerance of plant to various stresses, play import in seed development, maturation and dormancy. Identify the correct names of hormones marked as ‘X’, ‘Y’ & ‘Z’.
Gibberellins can promote seed germination because of their influence onCorrectIncorrect
Fruit and leaf drop at early stages can be prevented by the application ofCorrectIncorrect
Which one of the following growth regulators is known as ‘stress hormone’?CorrectIncorrect
Induction of cell division and delay in senescence is done byCorrectIncorrect
The picture below shows three different types of plants (marked as P-I, P-II and P-III) which flower on the basis of their critical photoperiod. Now identify these plants (P-I, II and III).CorrectIncorrect
Sexual reproduction in fungi may occur by means ofCorrectIncorrect
Which of the following statements is/are true?
(i) The apoplastic movement of water occurs exclusively through the cell wall without crossing any membranes.
(ii) The apoplastic movement occurs from cell to cell through the plasmodesmata
(iii) endodermis, is impervious to water because of a band of suberised matrix.
(iv) Symplastic movement may be aided by cytoplasmic streaming which occurs in hydrilla leaf and chloroplast.CorrectIncorrect
The ability of the Venus Flytrap to capture insects is due toCorrectIncorrect
Herbarium is –CorrectIncorrect
Treatment of seeds at low temperature under moist conditions to break its dormancy is calledCorrectIncorrect
. Edible part of mushroom isCorrectIncorrect
Coiling of garden pea tendrils around any support is an example ofCorrectIncorrect
By sucking through a straw, a student can reduce the pressure in his lungs to 750 mm of Hg (density = 13.6 gm/cm3). Using the straw, he can drink water from a glass up to a maximum depth ofCorrectIncorrect
A small spherical solid ball is dropped in a viscous liquid. Its journey in the liquid is best described in the figure by :CorrectIncorrect
The area of cross-section of the wider tube shown in the figure is 800 cm^2. If a mass of 12 kg is placed on the massless piston, the difference is heights h in the level of water in the two tubes is:CorrectIncorrect
A U tube with both ends open to the atmosphere is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil isCorrectIncorrect
A rectangular film of liquid is extended from (4 cm× 2 cm) to (5 cm×4 cm) If the work done is 3×10^−4 J, the value of the surface tension of the liquid isCorrectIncorrect
Three liquids of densities ρ1, ρ2 and ρ3 (with ρ1>ρ2>ρ3), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact θ1, θ2 and θ3 obeyCorrectIncorrect
The approximate depth of an ocean is 2700 m. The compressibility of water is 45.4 x 10-11 Pa-1 and density of water is 103kg/m3. What fractional compression of water will be obtained at the bottom of the ocean?CorrectIncorrect
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 pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be (Pair=1.2kg/m3)CorrectIncorrect
Water rises to a height h in capillary tube. If the length of capillary tube above the surface of water is made less than h, thenCorrectIncorrect
A spherical black body with a radius of 12cm radiates 450-watt power at 500 K. If the radius was halved and the temperature doubled, the power radiated in watt would be:CorrectIncorrect
Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100° C, while the other one is at 0° C. If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is –CorrectIncorrect
A body cools from a temperature 3T to 2T in10 minutes. The room temperature is T. Assume that Newton’s law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be –CorrectIncorrect
A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U1, at wavelength 500nm is U2 and that at 1000nm is U3. Given Wien’s constant b=2.88×10^6 nm−k. Which of the following is correct?CorrectIncorrect
The two ends of a metal rod are maintained at temperatures 100°C and 110°C. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures 200°C and 210°C, the rate of heat flow will beCorrectIncorrect
Liquid oxygen at 50K is heated to 300K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?CorrectIncorrect
One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K)→(4.0 atm, 5.0 L, 245 K) with a change in internal energy, ΔU = 30.0 L atm. The change in enthalpy (∆H) of the process in L atm is:CorrectIncorrect
The entropy change in the fusion of one mole of a solid melting at 27°°C (the latent heat of fusion is 2930 J mol-1) isCorrectIncorrect
The maximum work done in expanding 16 g oxygen at 300 K and occupying a volume of 5 dm3 isothermally until the volume becomes 25 dm3 is:CorrectIncorrect
1 mole of an ideal gas at 25°C is subjected to expand reversibly ten times of its initial volume. The change in entropy of expansion is:CorrectIncorrect
Select the incorrect statementCorrectIncorrect
What is a necessary condition for a reaction to be spontaneous at all temperatures?CorrectIncorrect
What is the ratio of Cp/Cv for gas if the pressure of the gas is proportional to the cube of its temperature and the process is an adiabatic process.CorrectIncorrect
If the co-efficient of performance of a refrigerator is 5 and operates at the room temperature (270C) , find the temperature inside the refrigeratorCorrectIncorrect
If the mean free path of atoms is doubled then the pressure of the gas will become:CorrectIncorrect
A thermally insulated piston divides a non conducting container in two compartments, right compartment of 2V, T and 2P, while in the left compartment the respective values are V, T and P. Total moles in total system of both compartments is 5 moles. If piston can slide freely, and in the final equilibrium position, volume of right compartment is xV/5 then finds the value of x.–CorrectIncorrect
The graph which represents the variation of mean kinetic energy of molecules with temperature t° C is?CorrectIncorrect
The mass of a hydrogen molecule is 3.32 × 10–27 kg. If 1023 hydrogen molecules strike, per second, a fixed wall of area 2 cm2 at an angle of 45° to the normal, and rebound elastically with a speed of 103 m s–1, then the pressure on the wall is nearlyCorrectIncorrect
Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside willCorrectIncorrect
The temperature, at which the root mean square velocity of hydrogen molecules equals their escape velocity from the earth, is closest to
[Boltzmann constant, kB = 1.38 × 10–23 J/K,
Avogadro Number, NA = 6.02 × 1026/ kg,
Radius of Earth: 6.4 × 106 m,
Gravitational acceleration on Earth = 10 m s–2]CorrectIncorrect
A gaseous mixture consists of 16 g of helium and 16 g of oxygen. The ratio CP /CV of the mixture isCorrectIncorrect
ln HS– , l– , R – NH2, NH3 order of proton accepting tendency will be
- l– > NH3 > R – NH2 > HS–
- NH3 > R – NH2 > HS– > l–
- R – NH2 > NH3 > HS– > I–
- HS– > R – NH2 > NH3 > l–
Ionisation constant of CH3COOH is 1.7 * 10-5 and concentration of H+ ions iss 3.4 * 10-4. Then find out initial concentration of CH3COOH molecules
- 4 * 10-4
- 4 * 10-3
- 8 * 10-4
- 8 * 10-3
Solubility of M2S salt is 3.5 * 10-6 then find out solubility product
- 7 * 10-6
- 7 * 10-16
- 7 * 10-18
- 7 * 10-12
Reaction BaO2(S) ⇋ BaO(S) + O2(g) ; ∆H = +ve. In equilibrium condition, pressure of O2 depends onCorrectIncorrect
Solubility of MX2 – type electrolytes is 0.5 * 10-4 mole/L, then find out Ksp of electrolytes
- 5 * 10-12
- 25 * 10-10
- 1* 10-13
- 5 * 10-13
Which has highest pH?
Solution of 0.1 N NH4OH and 0.1 N NH4Cl has pH 9.25. Then find out pKb of NH4OH
Which one of the following compounds is not a protonic acid ?
The reaction quotient (Q) for the reaction N2(g) + 3H2(g) 2NH3(g) is given by
. The reaction will proceed from right to left ifCorrectIncorrect
The solubility product of Agl at 25°C is 1.0 * 10-16 mol2L-2. The solubility of Agl in 10-4 M solution of Kl at 25°C is approximately (in mol L-1)
- 1.0 * 10-16
- 1.0 * 10-12
- 1.0 * 10-10
- 1.0 * 10-8
The following equilibria are given
The equilibrium constant of the reaction
2NH3 + 5/2 O2 ⇋ 2NO + 3H2O in terms of K1 , K2 and K3 is
- K1 K2 K3
- K1 K2 / K3
- K1 K32 / K2
- K2 K33 / K1
The solubility product of a sparingly soluble salt AX2 is 3.2 * 10-11. Its solubility (in moles / litre) is
- 6 * 10-6
- 1 * 10-4
- 2 * 10-4
- 4 * 10-4
The hydride ion H- is stronger base than its hydroxide ion OH-. Which of the following reaction will occur if sodium hydride (NaH) is dissolved in water?
- H– + H2O à No reaction
- H– (aq) + H2O à H2O
- H– (aq) + H2O(I) à OH– + H2
- None of these
Which of the following element is responsible for oxidation of water to O2 in biological process?CorrectIncorrect
The volume strength of 1.5 NH2O2 solution isCorrectIncorrect
Which one of the following pairs of substances on reaction will not evolve H2 gas ?CorrectIncorrect
Zn gives H2 gas with H2SO4 and HCl but not with HNO3 becauseCorrectIncorrect
When a substance (a) reacts with water it produces a combustible gas (b) and a solution of substance (C) in water.When another substance (d) reacts with this solution of (C), it also produces the same gas (b) on warming but (d) can produce gas (b) on reaction with dilute sulphuric acid at room temp. Substance (a) imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. Then (a), (b), (c) and (d) respectively are
- Ca , H2 , Ca(OH)2, Sn
- K, H2, KOH, AI
- Na,H2, NaoH, Zn
- CaC2, C2H2, Ca(OH)2,Fe
A solid compound X on heating gives CO2 gas aand a residue, The residue mixed with water forms Y. On passing an excess of CO2 through Y in water, a clear solution Z is obtained. On boiling Z, compound X is reformed. The compound X is
The correct order of increasing thermal stability of K2CO3 , MgCO3 , CaCO3 and BeCO3 is
- BeCO3 < MgCO3< CaCO3< K2CO3
- MgCO3< BeCO3< CaCO3< K2CO3
- K2CO3 < MgCO3< CaCO3 < BeCO3
- BeCO3< MgCO3< K2CO3 < CaCO3
In which of the following the hydration energy is higher than the lattice energy?
Property of the alkaline earth metals that increase with their atomic numberCorrectIncorrect
Which of the following compounds is a peroxide?
Aluminium (III) chloride forms a dimer because aluminiumCorrectIncorrect
Boron compounds behave as Lewis acids, because of theirCorrectIncorrect
In graphite, electrons areCorrectIncorrect
Purification of aluminium, by electrolytic refining, is known asCorrectIncorrect
Cassiterite in an ore ofCorrectIncorrect
In borax bead test which compound is formed?CorrectIncorrect
Percentage of lead in lead pencil isCorrectIncorrect