Learning Science

1. © Department for Education, the Government of South Australia, Learning at home, 2022
Year 7
Lesson 13 – classification of living things
Science

2. © Department for Education, the Government of South Australia, Learning at home, 2022
Handy tips for this lesson
View the lesson in slide show mode to use the buttons:
• Use the arrows in the top right corner to go to the next or previous
slide.
• Click the home button to go back to the first slide.
• Some slides have audio. Click on the speaker button to listen.
• Some slides may be interactive. Click the button for extra elements.

3. © Department for Education, the Government of South Australia, Learning at home, 2022
• A pen and paper.
• A digital device.
You will need

4. © Department for Education, the Government of South Australia, Learning at home, 2022
Lesson 12: challenge answer
If there were no shells on the beach the colour of the
beach would be very different. It could be rocky or
black in colour.​
​The Department for Environment and Water has
implemented restrictions on the number and size of
cockles to help preserve the species. By ensuring we
keep small cockles on the beach, they have a chance
to grow and reproduce to make more cockles. If we all
took too many cockles, the species could become
endangered and then the animals which feed on them
would be affected.
Source: Pixabay

5. © Department for Education, the Government of South Australia, Learning at home, 2022
Learning intention
To know and understand the characteristics of worms.

6. © Department for Education, the Government of South Australia, Learning at home, 2022
Worms
There are 3 different phyla of worms:
• round worms
• flat worms
• segmented worms.

7. © Department for Education, the Government of South Australia, Learning at home, 2022
Phylum platyhelminthes: flatworms
• The body is flattened from the back through to
the abdomen and so they are called flatworms.
• They have bilateral symmetry which means the
left and right halves of the body have the same
design.
• There is no true internal body cavity.
• They are either free-living like Planaria or parasitic
animals (living in the bodies of other animals) like
a liver fluke. Source: janderk, Public domain, via Wikimedia Commons

8. © Department for Education, the Government of South Australia, Learning at home, 2022
Phylum nematodes: round worms
• They are called roundworms because they
are cylindrical and are unsegmented.
• They have no true body cavity.
• Their bodies are bilaterally symmetrical.
• They can be found as free-living
organisms in the soil, and in aquatic
environments. Others are parasites living
in animals and plants. Source: Bob Goldstein, UNC Chapel Hill http://bio.unc.edu/people/faculty/goldstein/, CC
BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons

9. © Department for Education, the Government of South Australia, Learning at home, 2022
Phylum annelida: segmented worms
• They have bilateral symmetry and are made up of
segments.
• The segments are lined up one after the other
from head to tail.
• These animals are found in a variety of habitats
i.e. freshwater, marine water as well as on land.
• They do have a true body cavity.
• Examples are earthworms and leeches.
Source: Pixabay

10. © Department for Education, the Government of South Australia, Learning at home, 2022
Worm farms
Watch the video on Basic Guide to Worm Farms. Return to the PowerPoint at the
end of the video.
Source: Basic Guide to Worm Farming on YouTube (Whitehorse City Council, 2017)
For your safety, watch this video in the slideshow without accessing YouTube.

11. © Department for Education, the Government of South Australia, Learning at home, 2022
Earthworm castings
Earthworm waste called ‘castings’ is more nutrient rich than the soil
the worm initially consumed.
The nutrients contain nitrogen and phosphorus which are often
very low in Australian soils.
Plants need these nutrients to grow.

12. © Department for Education, the Government of South Australia, Learning at home, 2022
Review
There are 3 phyla of invertebrates.
Nematodes Annelida Platyhelminthes
Round worms Segmented worms Flat worms
Source: Pixabay
Source: Wikimedia [Public Domain] Source: Pixabay

13. © Department for Education, the Government of South Australia, Learning at home, 2022
Challenge
• Where do you find leeches?
• How can they be harmful?
• How can they be beneficial to
medicine?
Source: Pixabay

14. © Department for Education, the Government of South Australia, Learning at home, 2022
Key terms
• Free living – living freely and independently.
• Parasite – an organism that lives in or on another organism, is
dependent on the organism to survive and benefits by deriving
nutrients at the other's expense.

16. © Department for Education, the Government of South Australia, Learning at home, 2022
Copyright statement
The Department for Education, South Australia, has created teaching and curriculum resources
to support students during the staged return to school in 2022.
The resources are available for students, parents and teachers in South Australia, where students
are undertaking remote learning.
The material has been produced and communicated on behalf of the State and, to the extent
necessary, in reliance on section 113P and/or Part VII of the Copyright Act 1968 (Cth).
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