Practice question
Question
A freshwater protist lacks a cell wall, possesses a flexible protein-rich covering and has one short and one long flagellum. How does it behave when sunlight is unavailable?
Explanation
The organism is a euglenoid. Euglenoids possess a flexible 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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