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Riverside Junior School

Monday - Science

All Living things


More about micro-organisms

In the last lesson you set up an investigation to find out which conditions cause mould to grow. You have been observing your slices of bread and recording your results. Now it is time to use your results to form your conclusion. Collect your slices of bread, ensuring that you do not open the sealed bags.


Task 1:

Observe your slices of bread again, and look at your results table.

  • Do you notice anything about the different slices of bread?
  • Did mould appear earlier on one of the slices?
  • Is there more mould growing on one of the slices?

Think about what this tells you. Can you use your results to answer your question?


Answer the questions from the sheet below...



Task 2:

Mould is a fungus, which is just one type of microorganism. All microorganisms share similarities and differences, and can be classified using the Linnaean taxonomic system. 

All living things are initially grouped into 3 domains: archaea, bacteria and eukaryotes.

The living things in the archaea and bacteria domains are collectively known as the prokaryotes.

Fungi, plants and animals are all eukaryotic kingdoms. Eukaryotic microorganisms include mould and yeast, as well as microscopic animals and plants such as dust mites or plankton.

Bacteria are prokaryotic microorganisms.

Viruses are not classified using the standard classification system.





What is the difference between eukaryotic microorganisms and prokaryotic microorganisms?

The main difference between the two types of organisms is the structure of their cells.

Cells are the building blocks of an organism. Many microorganisms are made of just one single cell. It may help you to think of cells as small compartments that contain the things needed to keep an organism alive.


Eukaryotic cells, such as the mould cells on your bread, contain smaller parts called organelles. A very important organelle in eukaryote cells is the nucleus. It acts as the control centre of the cell and includes all the genetic information of the cell, which is known as its DNA. The DNA is organised inside the nucleus.

Prokaryotic cells such as bacteria do not usually contain any organelles. They do not have a nucleus and their DNA is not organised or contained within any structure in the cell.



Which do you think is a fungus cell and which one is a bacterium cell?


Can you use playdough (or any other material available to you) to design your own single-celled microorganism? 

  • Think about which type of microorganism it will be. Will it be eukaryotic (fungi, animals and plants) or prokaryotic (bacteria)?
  • Perhaps it will be a fungus, with a nucleus containing its DNA. Or maybe it will be a bacterium, with its DNA free within the cell.


Send your photos or drawings to your class teacher to earn some ClassDojo points! Remember if you don't have a printer that's fine, just write out your answers/findings in your home learning book!

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