A beaker of pond water containing few specimens of Euglena was placed in a dark room for two weeks. At the end of this period, the specimens of Euglena were still alive because they were
-
able to carry out holozoic nutrition
- able to carry out photosynthesis using carbon dioxide in the pond water
- better adapted to life in darkness than to life in light
- not overcrowded
The correct answer is: A
Explanation
Euglena can survive in a dark room for a long time because it has the ability to switch from photosynthetic (using light) to heterotrophic or holozoic nutrition (absorbing nutrients from the surrounding environment) when deprived of light; essentially acting like a tiny animal by consuming organic matter in the water, allowing it to continue living even without photosynthesis through its chloroplasts.
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