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Unicellular Organisms Worksheet

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Unicellular Organisms Worksheet

Read the field notes, then solve each task. In these organisms, the cell performs all the processes needed for life.

Field notes: a drop from the pond

A class investigates a drop of pond water under a microscope. They find three kinds of tiny living things. Amoebae change shape and surround food with parts of their cell. Paramecia move using many tiny hairs called cilia; these hairs also help sweep food towards them. Euglena move with a whip-like flagellum and can make food using light. Bacteria are also unicellular, but they do not have a nucleus. These organisms live in water, damp soil and many other places. Some help break down dead material, while others form part of food chains. Their cells are too small to see clearly without a microscope.

Read and investigate

1.Which statement best explains the word unicellular?
  • Made of one cell
  • Made of many organs
  • Made of no cells
  • Made only of dead cells
2.Which organism in the field notes moves using cilia?
  • Amoeba
  • Paramecium
  • Euglena
  • Bacterium
3.Complete the sentence: In a unicellular organism, one cell carries out all the processes needed for .
4.Match each organism to the movement or feature described in the field notes.
  • Amoeba
  • Paramecium
  • Euglena
  • Moves with a flagellum and can make food using light
  • Changes shape to surround food
  • Uses tiny hairs called cilia
5.True or false: Bacteria are unicellular, and the field notes say they do not have a nucleus.
TrueFalse
6.Give two places, mentioned or suggested by the field notes, where unicellular organisms may live.
7.Amoebae do not have a mouth. Using the field notes, explain how an amoeba can take in food.
8.Why does a scientist need a microscope to observe these organisms clearly?
9.The notes say some unicellular organisms break down dead material and others are part of food chains. Explain one way these activities can help an ecosystem.

2 printable pages

  • Unicellular Organisms Worksheet, page 1 of 2: Field notes: a drop from the pond, Read and investigate

    Page 1

  • Unicellular Organisms Worksheet, page 2 of 2: 5. True or false: Bacteria are unicellular, and the field notes say they do not have a…

    Page 2

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