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Microorganisms

Microorganisms

Assessment

Presentation

Biology, Science

7th Grade

Medium

NGSS
MS-LS2-3, MS-LS1-1, MS-LS2-4

+4

Standards-aligned

Created by

Silvia Chen

Used 22+ times

FREE Resource

30 Slides • 21 Questions

1

Microorganisms​

By Silvia Chen​

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Open Ended

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

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MICROORGANISMS

 Introduction & types

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DEFINITION

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

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Do you know what this instrument is called ?

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Multiple Choice

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What is this called ?

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Flute

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Microscope

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Ammeter

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Magnifying Glass

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CHARACTERISTICS

  • Ubiquitous in nature.

  • Mostly unicellular.

  • Found in clusters called colonies.

  • Beneficial as well as harmful.

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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.

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Multiple Choice

What is the other name for microorganisms ?

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organisms

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microor

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microbes

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microges

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1. Bacteria​

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CHARACTERISTICS

  • Singular:bacterium

  • Single-celled organisms.

  • Found everywhere (in colonies).

  • Aerobic-require oxygen for survival.

  • Anaerobic-do not require oxygen for survival.

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Sore Throats

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Tooth decay of an adult

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Tooth Decay of a child

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Whooping Cough

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and Typhoid.

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Open Ended

Write somethings that bacteria do.

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​2. Fungus

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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 ......

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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.

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Fungus growing on bread

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Mould on an orange

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​3. Protozoa

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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.

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4. ​Algae

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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.

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​Are microorganisms only harmful?

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

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Multiple Choice

Most microorganisms cannot be seen without a

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telescope

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periscope

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microscope

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Multiple Choice

Why should cooked and uncooked food be stored separately?

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Because bacteria only like cooked food

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Because bacteria only like uncooked food

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To stop bacteria from spreading to one another

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Multiple Select

Which two of these are not caused by a microorganism?

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Salmonella

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Flu

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Sprained Ankle

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Tooth Decay

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Multiple Choice

What does an antibiotic do?

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It kills viruses

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It kills all microorganisms

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It causes diseases such as malaria

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It kills bacteria

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Multiple Choice

True of False: All microorganisms are harmful

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True

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False

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Multiple Choice

True or False: Microorganisms are living things

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True

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False

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Multiple Choice

Harmful or Helpful: Bacteria decomposes dead leaves and animals

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Helpful

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Harmful

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Multiple Choice

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

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Harmful

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Helpful

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Multiple Choice

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

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Harmful

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Helpful

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Multiple Choice

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

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Harmful

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Helpful

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Multiple Choice

Harmful or Helpful: Uncooked food contain bacteria called Salmonella

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Harmful

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Helpful

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Multiple Choice

Harmful or Helpful: Bacteria used to make yogurt

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Harmful

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Helpful

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Multiple Choice

How are Protozoa harmful?

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Can cause diseases like Malaria

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Causes Athletes foot

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Acts as a decomposer

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Multiple Choice

How is Fungi Harmful?

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Causes Athletes foot

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Is food for animals

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helps bread rise

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Multiple Choice

How is algae harmful?

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Causes bacteria to grow

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Acts as a decomposer

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Causes Red Tide in Oceans

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Open Ended

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What are the kinds of microorganisms?

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Open Ended

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

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That's it !!!

See ya!!!

Microorganisms​

By Silvia Chen​

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