Biology MCQs

Page No. 15

Oil body is found in the cells of___________?


aDiatoms


bSlime moulds


cChlorophycean forms


dNone of the these


View Answer Diatoms

The chloroplasts of diatoms and chrysophycean algae do not possess____________?


aChloryphyllpigments


bEnzymes for photolysis


cDefined grana and stroma


dCarotenes with chlorophylls



Diatom frustule/ shell is made of_____________?


aSilica


bCalcium carbonate


cManesium carbonate


dBoth B. and C.


View Answer Silica

Empty diatom cells are called___________?


aRaphe


bValves


cFrustule


dGirdles


View Answer Frustule

Cell wall is extremely well preserved in fossil specimens in__________?


aDiatoms


bDinoflagellates


cSlime moulds


dNone of these


View Answer Diatoms

Unlike other algae, diatoms do not readily decay due to___________?


aNonliving cells


bSiliceous wall


cMucilaginous wall


dWater proof cell


View Answer Siliceous wall

The cell wall is usually composed of two overlapping halves called epitheca and hypotheca in__________?


aDiatoms


bDesmids


cPyrrophyta


dChlorophyta


View Answer Diatoms

Cell wall is richly impregnated with silica in__________?


aRhodophyta


bPhaeophyta


cBaciliariophyta


dEuglenophyta


View Answer Baciliariophyta

Microfossile often present in petroleum producing formationsare those of__________?


aDiatioms


bHeliozoans


cRadiolarians


dForaminiferans


View Answer Diatioms

Centric discoid form of diatoms is__________?


aDiplaneis


bCoscinodiscus


cCamphyloneiscus


dStephanodis


View Answer Coscinodiscus

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