B2.2: Identify organelles and other cell components, including the nucleus…
Identify organelles and other cell components, including the nucleus, cell membrane, cell wall, chloroplasts, vacuole, mitochondria, and cytoplasm, and explain their basic functions. (onion cells and DNA lesson; partial).
The Ontario Science and Technology, Grades 1–8 outcome B2.2 (Life Systems) for Grade 8 says: “Identify organelles and other cell components, including the nucleus, cell membrane, cell wall, chloroplasts, vacuole, mitochondria, and cytoplasm, and explain their basic functions. (onion cells and DNA lesson; partial).” This Fieldbook unit teaches it hands-on, with everyday materials and a printable teacher guide and student sheet for every lesson. Official wording: Ontario Science and Technology, Grades 1–8.
Cells: The Smallest Living Things Grades 7–8
How small is a cell, how does water get in, what's inside, and why are cells so tiny? Four lessons with potatoes, strawberries and gelatin that work with a microscope or without one.
- How big is a cell? 50–60 min
Students measure tiny things they can see, count how many fit across a millimetre, and build a scale ladder from a hand down to a single cell. With a microscope or a phone and a drop of water, they look at real onion cells and estimate their size.
- How do things get in and out of a cell? Two sessions: 45 min, then 30 min the next day
Students weigh potato strips, soak them in plain and salty water, and measure how their mass and stiffness change. They use the results to explain diffusion and osmosis, and why a wilted salad goes limp.
- Can you pull DNA out of a strawberry? 50–60 min
Students mash strawberries with dish soap and salt, filter the juice, and watch a cloudy white tangle of DNA appear when the teacher layers cold rubbing alcohol on top. They explain what each ingredient did to the cell, and test what happens without soap.
- Why are you made of many small cells, not one big one? 50–60 min, with cubes soaking for at least an hour
Students soak gelatin cubes of 1, 2 and 3 cm in food colouring, cut them open and measure how far the colour got in. They calculate surface area to volume and explain why cells stay small.
Printable practice for B2.2
- Cells: The Smallest Living Things workbook included with the unit
3 practice pages, 3 readings, 2 English-support pages, 1 word wall, 1 unit review, 1 unit test, with answer keys.
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Compared with NGSS: MS-LS1-2.
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