Microorganisms

Microorganisms​

By Silvia Chen​

Open Ended

What do you know about the microorganisms now before the lesson?

MICROORGANISMS

 Introduction & types

DEFINITION

-Tiny living organisms that can only be seen under a microscope are called microorganisms.
-Greek: mikros-small, organismos-organisms.

Do you know what this instrument is called ?

Multiple Choice

What is this called ?

• Flute

• Microscope

• Ammeter

• Magnifying Glass

CHARACTERISTICS

• Ubiquitous in nature.

• Mostly unicellular.

• Found in clusters called colonies.

• Beneficial as well as harmful.

Germs and Diseases

• Microorganisms are tiny organisms that can only be seen with a Microscope.

• They are also called Microbes.

• There are billions of them everywhere.

• Some are harmful while others are useful.

Multiple Choice

What is the other name for microorganisms ?

• organisms

• microor

• microbes

• microges

1. Bacteria​

​

CHARACTERISTICS

• Singular:bacterium

• Single-celled organisms.

• Found everywhere (in colonies).

• Aerobic-require oxygen for survival.
  

• Anaerobic-do not require oxygen for survival.

Sore Throats

Tooth decay of an adult

Tooth Decay of a child

Whooping Cough

and Typhoid.

Open Ended

Write somethings that bacteria do.

​2. Fungus

​

Fungus

• Fungi are non - green plants that cannot carry out photosynthesis.

• They live on dead organic matter of food. This included moulds that grow on ......

CHARACTERISTICS

• Singular : Fungus

• Heterotrophic (do not make their own food).

• Lack chlorophyll. Hence cannot make their own food.

• Mostly unicellular.
  

• Made up of thread like structures called hyphae.

• Hyphae forms a net like mas called mycelium.

• Cellwall is composed of chitin.

Fungus growing on bread

Mould on an orange

​3. Protozoa

​

CHARACTERISTICS

• are one-cell organisms that love moisture and often spread diseases through water

• Some protozoa cause intestinal infections that lead to diarrhea, nausea, and belly pain.

4. ​Algae

​

CHARACTERISTICS

• Singular : Alga

• Belongs to plant kingdom and possess characteristics similar to plants.

• Both unicellular and multicellular.

• Unicellular - Chlorella,  Volvox, Chlamydomonas.
  

• Multicellular - Spyrogyra, seaweeds (eg.fucus).
  

• Prepare their own food through photosynthesis.

​Are microorganisms only harmful?

​Let's work on some questions to find out!

Multiple Choice

Most microorganisms cannot be seen without a

• telescope

• periscope

• microscope

Multiple Choice

Why should cooked and uncooked food be stored separately?

• Because bacteria only like cooked food

• Because bacteria only like uncooked food

• To stop bacteria from spreading to one another

Multiple Select

Which two of these are not caused by a microorganism?

• Salmonella

• Flu

• Sprained Ankle

• Tooth Decay

Multiple Choice

What does an antibiotic do?

• It kills viruses

• It kills all microorganisms

• It causes diseases such as malaria

• It kills bacteria

Multiple Choice

True of False: All microorganisms are harmful

• True

• False

Multiple Choice

True or False: Microorganisms are living things

• True

• False

Multiple Choice

Harmful or Helpful: Bacteria decomposes dead leaves and animals

• Helpful

• Harmful

Multiple Choice

Helpful or Harmful: Microorganisms can cause diseases and sicknesses like chicken pox and malaria

• Harmful

• Helpful

Multiple Choice

Harmful or Helpful: Mold Growing on fruit and other foods that were left out

• Harmful

• Helpful

Multiple Choice

Harmful or Helpful: Adding yeast to bread to help it rise

• Harmful

• Helpful

Multiple Choice

Harmful or Helpful: Uncooked food contain bacteria called Salmonella

• Harmful

• Helpful

Multiple Choice

Harmful or Helpful: Bacteria used to make yogurt

• Harmful

• Helpful

Multiple Choice

How are Protozoa harmful?

• Can cause diseases like Malaria

• Causes Athletes foot

• Acts as a decomposer

Multiple Choice

How is Fungi Harmful?

• Causes Athletes foot

• Is food for animals

• helps bread rise

Multiple Choice

How is algae harmful?

• Causes bacteria to grow

• Acts as a decomposer

• Causes Red Tide in Oceans

Open Ended

What are the kinds of microorganisms?

Open Ended

Provide some examples of harmful and helpful impacts of microorganisms in our life.

That's it !!!

See ya!!!