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
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one characteristics of euglena is the ability to carry out autotrophic and heterotrophic mode of nutrition, therefore in the absence of light euglena will carry out holozoic mode of nutrition which does not require sunlight
The correct answer is B.
Euglena is a unicellular organism that is capable of both photosynthesis and holozoic nutrition. In the absence of light, Euglena would not be able to carry out photosynthesis, which is their primary means of obtaining energy. Therefore, the reason that the specimens of Euglena were still alive after two weeks in a dark room is because they were able to carry out cellular respiration using organic compounds that were present in the pond water. In this way, they could obtain the energy they needed to survive, despite the absence of light.
Option A is incorrect because Euglena cannot carry out holozoic nutrition in the absence of light.
Option C is incorrect because Euglena is better adapted to life in light, which is necessary for them to carry out photosynthesis and obtain energy.
Option D is also incorrect because overcrowding would not be a factor in the survival of Euglena in this scenario.
