Which of the following cells have a constantly changing shape?

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AAI Junior Assistant (Fire Service) Official Paper (Held On: 21 Apr, 2025 Shift 1)
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  1. Muscle cell
  2. Bone cell
  3. Amoeba cell 
  4. Nerve cell

Answer (Detailed Solution Below)

Option 3 : Amoeba cell 
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Detailed Solution

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The correct answer is Amoeba cell.

Key Points

  • Amoeba cells have a constantly changing shape due to the absence of a fixed cell wall. This allows them to form temporary projections called pseudopodia for movement and feeding.
  • Pseudopodia, meaning "false feet," are used by amoebas for both locomotion and engulfing food through a process called phagocytosis.
  • The flexibility of the amoeba’s plasma membrane enables the cell to continuously alter its shape as it interacts with its environment.
  • Amoebas are unicellular organisms found in water, soil, and as parasites, and their ability to change shape is an adaptation for survival.
  • This characteristic distinguishes amoebas from other cell types like muscle cells, bone cells, or nerve cells, which maintain a more constant structure.

Additional Information

  • Cell Morphology in Amoeba: Amoeba belongs to the Protista kingdom and exhibits an irregular shape due to its dynamic cytoplasm and lack of a rigid cell wall.
  • Pseudopodia Function: The pseudopodia not only help in movement (amoeboid movement) but also assist in capturing food particles and engulfing them, a process termed as endocytosis.
  • Phagocytosis and Pinocytosis: Amoebas use phagocytosis for solid food particles and pinocytosis for liquid intake, showcasing their versatile feeding mechanisms.
  • Other Examples of Amoeboid Movement: Amoeboid movement is also observed in certain human cells, such as white blood cells (leukocytes), during immune responses to engulf pathogens.
  • Comparison with Other Cells: Unlike amoeba, muscle cells are elongated and contractile, bone cells are rigid and structured, and nerve cells are specialized for transmitting electrical signals without shape alteration.
Latest AAI Junior Assistant Updates

Last updated on Apr 24, 2025

-> The AAI Junior Assistant Response Sheet 2025 has been out on the official portal for the written examination.

-> AAI has released 168 vacancies for Western Region. Candidates had applied online from 25th February to 24th March 2025.

-> A total number of 152 Vacancies have been announced for the post of Junior Assistant (Fire Service) for Northern Region.

-> Eligible candidates can apply from 4th February 2025 to 5th March 2025. 

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