Question 1The part of the mammalian brain responsible for maintaining balance isA.medulla oblongataB.cerebellumC.optic lobeD.cerebrumE.olfactory lobeObjective Show full explanation
Question 2Milk can be pasteurized byA.addition of common saltB.boiling for one hourC.heating to 75°C for 20 minutesD.the addition of vinegarE.heating to 100°C for 12 hoursObjective Show full explanation
Question 3Water is required for seed germination to take place because itA.activates the enzymesB.softens the testaC.liberates energy for growthD.permits radicle growthE.allows oxygen to diffuse into the seedObjective Show full explanation
Question 4If an organic compound has its hydrogen:oxygen ratio as 2:1, it is likely to beA.a proteinB.a carbohydrateC.a fatD.a fatty acid and glycerolE.an amino acidObjective Show full explanation
Question 5The movement of a plant in response to external stimulus of no particular direction isA.taxismB.tropismC.haptotropic movementD.nastic movementE.phototropismObjective Show full explanation
Question 6'Jointed skeleton' is absent in theA.cockroachB.spiderC.millipedeD.snailE.dragon flyObjective Show full explanation
Question 7In a Biuret test, some protein was mixed with sodium hydroxide solution. Which of the following chemicals should be added to the mixture for positive result?A.Mercurous nitrateB.Copper sulphateC.Mercuric nitrateD.Sodium carbonateE.Ammonium hydroxideObjective Show full explanation
Question 8Which of the following substances gives the BEST description of bark?A.Tissues outside the vascular cambiumB.Cork-like tissues found only in stemsC.Brown tissues never found in primary growthD.Cork-like tisses of old treesObjective Show full explanation
Question 9Nitrogen is released to the atmosphere byA.nitrogen-fixing bacteriaB.nitrifying bacteriaC.denitrifying bacteriaD.saprophytic bacteriaObjective Show full explanation
Question 10The respiratory organ of land snail isA.radulaB.mantleC.tentacleD.footObjective Show full explanation
Question 11The organelle responsible for heredity is labelled A.IB.IIC.IIID.IVObjective Show full explanation
Question 12Which is the correct order in an evolutionary sequence for the following plant groups?A.bacteria --> ferns --> algae --> mosses --> seed plantsB.bacteria --> ferns --> mosses --> algae --> seed plantsC.bacteria --> algae --> mosses --> ferns --> seed plantsD.bacteria --> mosses --> algae --> ferns --> seed plantsObjective Show full explanation
Question 13The habitat of the cysticercus of Taenia solium is A.alimentary canal of cattleB.muscle of pigC.alimentary canal of pigD.muscle of cattleObjective Show full explanation
Question 14The exchange of genes between homologous chromosomes is calledA.test crossB.back crossC.crossing-overD.mutationObjective Show full explanation
Question 15The main function of the choroid isA.protection of the eye ballB.transmission of lightC.supply of nutrients to tissues of the eyeD.converging lightObjective Show full explanation