In Year 6/7 Science we have been looking at cells using light microscopes. The image above shows cells from a spring onion, stained with methylene blue, to show cell walls and nuclei. Cells are all different shapes and sizes, but the cell theory states:
- All living organisms are made up of cells
- Cells are the basic organisational units of life
- All cells come from pre-existing cells
Before the end of term we will be having a test on Classsification and Cells. You will need to know the following:
- What are five characteristics of living organisms? (usually require oxygen; require nutrients; produce wastes; respond to stimuli; reproduce themselves)
- How are living organisms classified? Five Kingdoms – Animals, Plants, Fungi, Bacteria (Monera) and Protists.
- What is a dichotomous key? A branching key used to classify organisms into groups, using questions with only two answers – yes or no.
- Name the parts of a light microscope.
- What are three important things about cells (the cell theory).
- What are the three main differences between animal cells and plant cells.
This week in our Year 6/ 7 Science classes we are starting a project about Threatened Species. You have already learnt about the general characterisitics of all living organisms and how living organisms are classified into Five Kingdoms and smaller groups depending on characteristics such as: single or multicellular, autotrophic or heterotrophic, vertebrate or invertebrate, warm or cold-blooded, lay eggs or live births, fins, fur or feathers. You have also created a dichotomous key to identify 10 different objects of your own choosing (fruit, icecream flavours, drinks, lollies, sporting balls etc.)
Your project must be about a local Victorian threatened species (you can find a list at DNRE) and should demonstrate your understanding of the characterisitics of living organisms. Your student task sheet, including assessment rubric and research grid, can be found on the Year 6/7 wiki. (Activity 5) This project is due on Friday May 28th.
If you would like to practise some of the maths activities we did this week, here are the links:
Sort polygons into a table based on number and length of sides.
Shape Sorter – choose one or two rules and place the polygons in the appropriate Venn circle.
On Tuesday we had a visit from Elke at the CSIRO. Her program was all about Biodiversity – the great variety of living things on earth, how they are classified and why some are threatened with extinction. This image shows one of our students using a dichotomous key to identify Simpson’s characters. Other activities included laser monitoring of landscape temperature, temperature in a carbon-dioxide enhanced atmosphere, pH testing of water, soil texture, soil moisture and microscopic monitoring of species.
In Year 6/7 Science we will be learning about the characteristics of living organisms and the classification of animals. I have used Bubbl.us to create a dichotomous key as an example for students. They will use the same tool to create their own key to identify items of their choice – for example flavours of icecream or drinks, different balls or sporting equipment. Here is an example of a key to identify Fungi.
This week we are studying how living organisms are identified and classified into groups. We have learnt about the five kingdoms of organisms (Animals, Plants, Fungi, Protists and Monera) and we are familiar with the five main classes of vertebrates (Birds, mammals, reptiles, amphibians and fish). We will learn a little more about the invertebrates, which make up about 97% of all living things and we will construct a dichotomous key.
First choose ten items you are interested in – for example, things with wheels, items of clothing, chocolate bars or types of lollies. Copy pictures of each item and place them in front of you. Go to bubbl.us and create a dichotomous key – remember, each question must have only two options – Yes or No. Here is an example of one I created about animals: http://www.bubbl.us/edit?welcome-user-brittgow.