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Question

Which of the following is an autotrophic protist without a cell wall?

A
Gonyaulax
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B
Diatoms
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C
Euglena
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D
Physarum
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Solution

The correct option is C Euglena
Instead of a cell wall, Euglena has a protein-rich layer called pellicle.
Gonyaulax (a dinoflagellate) and diatoms are autotrophic protists with cell walls. Physarum is a slime mould which is heterotrophic.

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