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Q: Which unicellular organism obtains food through a process in which cells engulf external material through the cell membrane.
  • A. Yeast
  • B. Amoeba
  • C. Spirogyra
  • D. Volvox
Correct Answer: Option B - Amoeba is a unicellular organism that acquires its food through a process called phagocytosis, where it engulfs external material through the cell membrane. This process allows the amoeba to ingest larger particles , such as other microorganisms, which are then digested inside food vacuoles.
B. Amoeba is a unicellular organism that acquires its food through a process called phagocytosis, where it engulfs external material through the cell membrane. This process allows the amoeba to ingest larger particles , such as other microorganisms, which are then digested inside food vacuoles.

Explanations:

Amoeba is a unicellular organism that acquires its food through a process called phagocytosis, where it engulfs external material through the cell membrane. This process allows the amoeba to ingest larger particles , such as other microorganisms, which are then digested inside food vacuoles.