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Organ System Level of Organisation

Which photosy...

Question

Which photosynthetic organism behaves like heterotroph in the absence of sunlight ?

A

Euglenoids

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B

Sporozoans

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C

Slime moulds

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D

Ciliated protozoans

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Solution

The correct option is A Euglenoids
Euglenoids are fresh water protists. They are photosynthetic in the presence of sunlight and behave like heterotrophs by predating on other smaller organisms in the absence of sunlight. The pigments of euglenoids are identical to those present in higher plants.

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(i) These are mostly freshwater organisms found in stagnant water.
(ii) Their body is covered by a protein rich layer called pellicle which makes their body flexible.
(iii) They are photosynthetic in the presence of sunlight but become heterotrophs in the absence of sunlight.
(iv) They usually possess two flagella, one long and one short.
(v) Euglenoids are multicellular ciliate protists.

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