Biology MCQs

Page No. 15

Oil body is found in the cells of___________?


aDiatoms

✓


bSlime moulds

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cChlorophycean forms

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dNone of the these

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View Answer Diatoms

The chloroplasts of diatoms and chrysophycean algae do not possess____________?


aChloryphyllpigments

✖


bEnzymes for photolysis

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cDefined grana and stroma

✓


dCarotenes with chlorophylls

✖



Diatom frustule/ shell is made of_____________?


aSilica

✓


bCalcium carbonate

✖


cManesium carbonate

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dBoth B. and C.

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View Answer Silica

Empty diatom cells are called___________?


aRaphe

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bValves

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cFrustule

✓


dGirdles

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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

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bSiliceous wall

✓


cMucilaginous wall

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dWater proof cell

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View Answer Siliceous wall

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


aDiatoms

✓


bDesmids

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cPyrrophyta

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dChlorophyta

✖


View Answer Diatoms

Cell wall is richly impregnated with silica in__________?


aRhodophyta

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bPhaeophyta

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cBaciliariophyta

✓


dEuglenophyta

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View Answer Baciliariophyta

Microfossile often present in petroleum producing formationsare those of__________?


aDiatioms

✓


bHeliozoans

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cRadiolarians

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dForaminiferans

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View Answer Diatioms

Centric discoid form of diatoms is__________?


aDiplaneis

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bCoscinodiscus

✓


cCamphyloneiscus

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dStephanodis

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View Answer Coscinodiscus

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