AQA · GCSE · Biology
Course version: 8461 · Version from Sept 2018
AT skills covered by this practical activity: AT 1 and 7.
Full specification wording
Animal and plant cells: AT skills covered by this practical activity: AT 1 and 7.
AT 1 requires recording quantitative measurements, such as cell length, not just general observations.
Checked against the AQA 8461 specification (opens in a new tab) on .
- Point 7 of 8
- 4 key terms
Study notes
From the checked teaching notes for this specification point.
The idea
AT 1 requires recording quantitative measurements, such as cell length, not just general observations. This statement identifies the apparatus and techniques (AT) developed by the practical. AT 7 involves using a light microscope to observe, draw, and label cells accurately. You record what you see, including the cell wall, membrane, cytoplasm, nucleus, chloroplasts, and vacuole, labelling drawings with straight lines. For AT 1, you use apparatus to measure and record quantitative data, such as estimating cell size using the field of view. The practical is assessed through written observations, drawings, and calculations of magnification and scale, ensuring safe and correct microscope setup.
What earns the marks
- AT 1 involves recording quantitative measurements, such as estimating the length of a cell using the field of view.
- Selects and safely uses a light microscope, starting on the lowest power objective to locate the specimen.
- Prepares a suitable slide, lowering the coverslip carefully with a mounted needle to reduce air bubbles.
- Draws and labels observed cell structures accurately, using straight uncrossed label lines and including a magnification or scale where required.
Common mistakes and how to put them right
Assuming AT 1 is just making observations.
Put it right: AT 1 requires recording quantitative measurements like cell length.
Standard procedural errors in focusing are noted.
Put it right: Begin on the lowest power, find the specimen, then increase magnification.
Drawing a textbook diagram rather than the observed cells.
Put it right: Draw only what is visible in the field of view, including any imperfections.
Exam tips
- Ensure you include quantitative measurements (AT 1) such as cell size estimates when describing your observations.
- When describing magnification, state the objective lens and eyepiece lens values and show how the total magnification is calculated.
Try the lesson
The start of the Animal and plant cells: AT skills covered by this practical activity: AT 1 and 7. lesson, made from checked teaching notes for this specification point.
Have a go first
A student is preparing a microscope slide of onion cells. Why should they lower the coverslip at an angle using a mounted needle?
Listen
AT 1 requires recording quantitative measurements, such as cell length, not just general observations. This statement identifies the apparatus and techniques (AT) developed by the practical. AT 7 involves using a light microscope to observe, draw, and label cells accurately. You record what you see, including the cell wall, membrane, cytoplasm, nucleus, chloroplasts, and vacuole, labelling drawings with straight lines. For AT 1, you use apparatus to measure and record quantitative data, such as estimating cell size using the field of view. The practical is assessed through written observations, drawings, and calculations of magnification and scale, ensuring safe and correct microscope setup. A strong answer earns marks for these points. AT 1 involves recording quantitative measurements, such as estimating the length of a cell using the field of view. Selects and safely uses a light microscope, starting on the lowest power objective to locate the specimen. Prepares a suitable slide, lowering the coverslip carefully with a mounted needle to reduce air bubbles. Draws and labels observed cell structures accurately, using straight uncrossed label lines and including a magnification or scale where required. A common slip: Assuming AT 1 is just making observations. Instead, AT 1 requires recording quantitative measurements like cell length. Exam tip: Ensure you include quantitative measurements (AT 1) such as cell size estimates when describing your observations.
Key words
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Quantitative measurements
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Light microscope
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Labelled drawings
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Magnification
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See every definition
- Quantitative measurements
- Recordings such as cell length or estimates of cell size using the field of view, rather than just general observations.
- Light microscope
- Apparatus selected and safely used to observe, draw and label cells, starting on the lowest power objective to locate the specimen.
- Labelled drawings
- Accurate drawings of observed cell structures using straight uncrossed label lines and including a magnification or scale where required.
- Magnification
- Calculated from the objective lens and eyepiece lens values, with the total magnification shown in calculations of magnification and scale.
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