Ever wondered how scientists can see tiny cells that are...
Biology258 views·Updated 29 Jun 2026·4 pagesYear 7 Biology: Exploring Microscopes and Cells
N
norah idlbi@norah_69
1 / 4
1
of 4
Microscope Parts and Functions
Learning to use a microscope is like mastering a superpower - suddenly you can see a whole hidden world! The eyepiece lens is where you look through, whilst the objective lenses do the actual magnifying work with different strengths.
The stage acts as a platform for your slide, held steady by stage clips. Light from a mirror or lamp shines up through your specimen so you can see it clearly. The coarse focus knob moves the stage up and down for rough focusing, whilst the fine focus knob makes tiny adjustments for crystal-clear images.
Don't forget the diaphragm - it controls how much light passes through, which is crucial for getting the perfect view of your specimen.
Top Tip: Always start with the lowest magnification objective lens and work your way up to higher magnifications!
2
of 4
Calculating Magnification and Making Slides
Working out magnification is dead simple: just multiply the eyepiece lens power by the objective lens power. So if you've got a 10x eyepiece and a 40x objective, you get 400x total magnification - that's 400 times bigger than normal!
Making a proper microscope slide takes a bit of practice but it's worth getting right. Cut a thin slice of your specimen, pop it on the slide, and add a drop of water or stain like iodine to make it easier to see.
The trickiest bit is lowering the cover slip without trapping air bubbles - use a mounted needle to guide it down slowly. Once it's on the stage under the clips, you're ready to start exploring!
Remember: Thinner specimens work better because light can pass through them more easily.
3
of 4
Plant Cells vs Animal Cells
Plant cells and animal cells share some key parts but have important differences that help them survive in different ways. Both have a nucleus (the control centre with DNA), cell membrane (controls what goes in and out), and cytoplasm (where chemical reactions happen).
Plant cells get extra features that animals don't have. The cell wall gives them structure and support, making plants sturdy. Chloroplasts are the green powerhouses where photosynthesis happens, turning sunlight into food.
The vacuole in plant cells is huge and central, storing water and keeping the cell firm. Animal cells have tiny vacuoles or none at all. Both cell types contain mitochondria - often called the powerhouse of the cell because they produce energy through cellular respiration.
Memory Trick: Think "Plant cells are like houses with extra rooms (cell wall, chloroplasts, big vacuole) whilst animal cells are more like flats!"
4
of 4
Specialised Cells
Different cells have amazing specialised features that make them perfect for specific jobs - it's like each cell has its own superpower! Red blood cells have no nucleus and a biconcave shape, plus they're packed with haemoglobin to carry oxygen around your body efficiently.
Root hair cells have long extensions and thin walls, making them brilliant at absorbing water and minerals from soil. Nerve cells (neurons) are incredibly long and thin with branches, designed to send electrical signals at lightning speed across your body.
Sperm cells are built for one mission - reaching and fertilising an egg cell. They've got a tail for swimming, enzymes in the head to break into the egg, and loads of mitochondria to power their epic journey.
Amazing Fact: A single nerve cell in a giraffe's leg can be over 4 metres long - that's longer than most cars!
We thought you’d never ask...
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Biology258 views·Updated 29 Jun 2026·4 pagesYear 7 Biology: Exploring Microscopes and Cells
N
norah idlbi@norah_69
Ever wondered how scientists can see tiny cells that are invisible to the naked eye? Microscopes are amazing tools that let us explore the microscopic world, revealing the incredible structures inside plant and animal cells. You'll also discover how different...
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Microscope Parts and Functions
Learning to use a microscope is like mastering a superpower - suddenly you can see a whole hidden world! The eyepiece lens is where you look through, whilst the objective lenses do the actual magnifying work with different strengths.
The stage acts as a platform for your slide, held steady by stage clips. Light from a mirror or lamp shines up through your specimen so you can see it clearly. The coarse focus knob moves the stage up and down for rough focusing, whilst the fine focus knob makes tiny adjustments for crystal-clear images.
Don't forget the diaphragm - it controls how much light passes through, which is crucial for getting the perfect view of your specimen.
Top Tip: Always start with the lowest magnification objective lens and work your way up to higher magnifications!
2
of 4Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Calculating Magnification and Making Slides
Working out magnification is dead simple: just multiply the eyepiece lens power by the objective lens power. So if you've got a 10x eyepiece and a 40x objective, you get 400x total magnification - that's 400 times bigger than normal!
Making a proper microscope slide takes a bit of practice but it's worth getting right. Cut a thin slice of your specimen, pop it on the slide, and add a drop of water or stain like iodine to make it easier to see.
The trickiest bit is lowering the cover slip without trapping air bubbles - use a mounted needle to guide it down slowly. Once it's on the stage under the clips, you're ready to start exploring!
Remember: Thinner specimens work better because light can pass through them more easily.
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of 4Sign up to see the content. It's free!
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Plant Cells vs Animal Cells
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Plant cells get extra features that animals don't have. The cell wall gives them structure and support, making plants sturdy. Chloroplasts are the green powerhouses where photosynthesis happens, turning sunlight into food.
The vacuole in plant cells is huge and central, storing water and keeping the cell firm. Animal cells have tiny vacuoles or none at all. Both cell types contain mitochondria - often called the powerhouse of the cell because they produce energy through cellular respiration.
Memory Trick: Think "Plant cells are like houses with extra rooms (cell wall, chloroplasts, big vacuole) whilst animal cells are more like flats!"
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of 4Sign up to see the content. It's free!
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Specialised Cells
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