Recent questions tagged 2007

Ergot of rye is caused by a species of :

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ICBN stands for :

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Which pair of the following belongs to Basidiomycetes ?

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Spore dissemination in some liverworts is aided by :

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In gymnosperms, the pollen chamber represents :

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Flagellated male gametes are present in all the three of which one of the following sets ?

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If you are asked to classify the various algae into distinct groups, which of the following characters you should choose ?

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Two plants can be conclusively said to belong to the same species if they :

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In the prothallus of a vascular cryptogam, the antherzoids and eggs mature at different times. As a result :

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Which one of the following statements about mycoplasma is wrong ?

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For a critical study of secondary growth in plants, which one of the following pairs is suitable ?

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Wich one of the following is a slime mould ?

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If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur :

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The overall goal of glycolysis, Krebs cycle and the electron transport system is the formation of :

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Select the wrong statement from the following :

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Which one of the following is not a contituent of cell membrane ?

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What is common to whale, seal and shark ?

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Which one of the following is an example of negative feedback loop in humans ?

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About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and :

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Biological organisation starts with :-

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Which one of the following polymers is prepared by condensation polymerization ?

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RNA and DNA are chiral molecules, their chirality is due to :

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Which one of the following vitamins is water soluble :

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In the reaction <img src =""/> Which of the following compounds will be formed ?

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$CH_3-CHCl-CH_2-CH_3$ has a chiral centre, which one of the following represents its R configurations :

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For the following : (a) $I^-$ (b) $Cl^-$ (c) $Br^-$ The increasing order of nucleophilicity would be :

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If there is no rotation of plane polarized light by a compound in a specific solvent, through to the chiral, it may mean that :

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Predict the product C obtained in the following reaction of butyne-1 : <img src =""/>

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Which of the compounds with molecular formula $C_5H_{10}$ yield acetone on ozonolysis :

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The order decreasing reactivity towards an electrophilic reagent, for the following : (a) Benzene (b) Toluene (c) Chlorobenzene and (d) Phenol Would be :

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Which one of the following on reduction with lithium aluminium hydride yield a secondary amine:

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Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid :

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Consider the following compounds : (i) $C_6H_5COCl$ (ii) <img src =" "/> The correct decreasing order of their reactivity towards hydrolysis is

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Reduction of aldehydes and ketones into hydrocarbons using zinc amalgum and conc. HCl is called :

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The product formed in Aldol condensation is :

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Which of the following presents the correct order of the acidity in the given compounds :

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If $NaCl$ is doped with $10^{-4}$ mole % of $SrCl_2$, the concentrate of cation vacancies will be : $(N_A = 6.02 \times 10^{23}) mol^{-1}$

asked Jul 26, 2018 by pady_1

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Which of the following will give a pair of enantiomorphs:($en = NH_2 CH_2 CH_2 NH_2$)

asked Jul 26, 2018 by pady_1

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The d electron configuration of $Cr^{2+}, Mn^{2+}, Fe^{2+}$ and $Ni^{2+}$ are $3d^4$, $3d^5$, $3d^6$ and $3d^8$ respectively. Which one of the following aqua complex will exhibit the minimum paramagnetic behaviour ? (At. No. Cr = 24, Mn= 25, Fe = 26, Ni = 28)

asked Jul 26, 2018 by pady_1

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Which one of the following ions is the most stable in aqueous solution ? (At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)

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Identify the incorrect statement among the following:

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Which of the following oxidation states are the most characteristic for lead and tin respectively:

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Which one of the following orders correctly represents the increasing acid strengths of the given acids:

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Which one of the following anions is present in the chain structure of silicates:

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Sulphide ores of metals are usually concentrated by Froth Flotation process. Which one of the following sulphide ores offers and exception and is concentrated by chemical leaching ?

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The correct order of increasing thermal stability of $K_2CO_3, MgCO_3, CaCO_3$ and $BeCO_3$ is:

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Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true :

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In which of the following the hydration energy is higher than the lattice energy:

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Which one of the following ionic species has the greatest proton affinity to form stable compound:

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The correct order of C-O bond length among $CO, CO^{2-}_3, CO_2$ is :

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