Kingdom Protista Features · NCERT Biology

Euglenoids are considered a link between plants and animals because:

  1. They have a cell wall made of cellulose but are heterotrophic
  2. They photosynthesize in sunlight but switch to heterotrophic feeding in the dark
  3. They possess cilia for movement but lack a nucleus
  4. They reproduce exclusively by spore formation and lack any sexual stage
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Correct answer: They photosynthesize in sunlight but switch to heterotrophic feeding in the dark

Euglenoids like Euglena are mixotrophic: they perform photosynthesis when light is available but consume organic matter when deprived of sunlight. Their photosynthetic pigments are identical to those found in higher plants.

Difficulty: Medium Question 4 of 20

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