Question 3
Photosynthesis and Plant NutritionA 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
- A.able to carry out holozoic nutrition.
- B.able to carry out photosynthesis using carbon dioxide in the pond water.
- C.better adapted to life in darkness than to life in light.
- D.not overcrowded.
Show the answer and explanation
Answer: A (able to carry out holozoic nutrition.)
Explanation
Without light Euglena cannot photosynthesise, but it can switch to feeding on organic matter (heterotrophic nutrition), so it survives in the dark.