Practice question

MCQ

Question

Euglenoids exhibit a fascinating mixotrophic nutrition. When deprived of sunlight, how do they obtain energy?

Options

Choose one · Correct answer highlighted

By switching to chemosynthesis using sulfur compounds. By forming symbiotic relationships with local fungi. By behaving like heterotrophs and predating on smaller organisms. Correct By absorbing dissolved organic matter as saprophytes.

Explanation

According to NCERT Biology, Euglenoids are remarkably unique because they are photosynthetic autotrophs when sunlight is available. However, they exhibit 'mixotrophic' behavior. When deprived of sunlight, they seamlessly switch their mode of nutrition and behave completely like heterotrophs by actively predating on other smaller microscopic organisms present in their aquatic environment, demonstrating a fascinating evolutionary link.

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