Practice question

MCQ

Question

An aquatic unicellular eukaryote has no cell wall, possesses a flexible protein-rich covering and has one short and one long flagellum. How does it obtain food when sunlight is absent?

Options

Choose one · Correct answer highlighted

It preys on smaller organisms. Correct It oxidises inorganic substances. It absorbs nutrients through fungal hyphae. It fixes atmospheric nitrogen in heterocysts.

Explanation

The organism is a euglenoid. Euglenoids have a protein-rich pellicle and two unequal flagella. They photosynthesise in sunlight but behave as heterotrophs by preying on smaller organisms when sunlight is unavailable.

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