The level of organization of Amoeba and Euglena cell is ________?

1. Analyze the question The question asks about the level of organization of Amoeba and Euglena. Both are single-celled (unicellular) organisms, so we need to find the level at which a single cell operates.

2. Explain the concept Biological organization goes from simple to complex:

Cell → Tissue → Organ → System → Organism

• Unicellular organisms (Amoeba, Euglena, Paramecium, Chlamydomonas) are made of just one cell. That single cell performs every life function: feeding, respiration, excretion, reproduction and movement.
• Multicellular organisms (humans, maize, goats) have many cells grouped into tissues, organs and systems.

3. Step-by-step solution

• Amoeba is one cell. It uses pseudopodia to move and feed, and a contractile vacuole for osmoregulation.
• Euglena is one cell. It uses a flagellum to move and chloroplasts to photosynthesize.
• Because each organism is only a single cell, there are no tissues, organs or systems. These need many cells working together.

So the organization level is the cell level (also called the protoplasmic or unicellular level).

4. Answer Option C: cell

The other options are wrong because:

• A (organ), B (system) and D (tissue) all require groups of many cells, which these organisms do not have.

5. Exam tip Remember "Uni = One." Whenever you see Amoeba, Euglena, Paramecium, Chlamydomonas or Plasmodium, think of cell-level organization. Colonial forms like Volvox are different, because they are groups of cells, so don't mix them up.