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14 Cards in this Set
- Front
- Back
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What are all living things made of? |
Cells |
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How can you see cells? |
Only by using a microscope |
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What parts do cells have in common? |
Cell membrane= surrounds the cell. It is semi-permeable, this means it controls what enters and leaves the cell.
Cytoplasm= made of liquid (water) with organelles moving in it.
Nucleus= controls all if the activities in the cell.
Vacuole= this stores water, salt, sugar, waste and it is temporary in an animal cell. It is large and permeable in a plant cell. |
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What do plant cells have? |
Cell wall= the outside of the membrane. It is fully permeable. It gives shape+support to the cell.
Chloroplasts= these contain the pigment chlorophyll. This is used to trap light from the sun to make food for the plant during photosynthesis.
Large Permanent Vacuole Permanent Vacuole Permanent Vacuole Permanent Vacuole |
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What is a microscope used for? |
To examine the little cells in detail as they are too small to be seen without it.
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What are the parts of the microscope? |
The Eyepiece: where we look through, it has a lens that magnifies x10.
The 3 Objective Lenses: low power, medium power and high power magnification.
The Glass Slide: where you put the cell and the slide is placed on the stage.
The Cover Slip: when the cells are stained, the cover slip is lowered on the cell, gently to avoid trapping air bubbles. Excess stain is removed using a strip of filter paper. The Coarse Focus Wheel: moves the stage up and down which allows us to focus on the cells more clearly. |
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What stain is used to examine cheek cells (animal cells)? |
The Methylene Blue Stain |
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What stain is used to examine the onion cell (plant cell)? |
The Iodine Stain |
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Explain Cell Organisation. |
All living things are made of cells. The cells group together to carry out different functions. |
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How is a tissue formed? |
A tissue is formed when similar cells work together for a particular function e.g. blood, muscle. |
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How is an organ formed? |
An organ is formed when a group of tissues work together to carry out a particular function e.g heart, kidney. |
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How is a system formed? |
When organs work together to carry out a particular function e.g circulatory nervous system |
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How is an organism made? |
An organism is made up of all the systems working together e.g humans. |
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When does growth occur? |
Growth occurs when cells divide. |
