Starter quiz
Complete the word summary for photosynthesis.- 'oxygen' ✓
This cell absorbs water into a plant. It is called a root ______ cell.- 'hair' ✓
- Which process requires energy from cellular respiration?
- Osmosis
- Active transport ✓
- Diffusion
- Gas exchange
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- Why is active transport needed for root hair cells to absorb nitrates from the soil?
- Nitrates are absorbed by diffusion.
- Nitrates are absorbed by osmosis.
- Nitrates are absorbed from low to high concentration. ✓
- Nitrates are absorbed from high to low concentration.
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- As well as being a reactant in photosynthesis, water is used to maintain the structural integrity of many plants. Without water plants may wilt. Cells in a wilting plant are described as __________.
- dehydrated
- hydrated
- floppy
- flaccid ✓
- turgid
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- Many chemical reactions take place in the cell cytoplasm. Water is the ______ in which the reactant and products are dissolved.
- 'solvent' ✓
Exit quiz
Which part of the light microscope is the objective lenses?- a ✓
- b
- c
- d
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- Put these statements in the correct order to describe how to set up a light microscope.
- 1⇔Put the slide on the stage.
- 2⇔Turn on the light.
- 3⇔Looking from the side, raise the stage up close to the objective lens.
- 4⇔Looking down the eyepiece lens, move the stage downwards.
- 5⇔Use the fine focus wheel to get the sharpest possible image.
- Looking from the side whilst moving the stage and slide towards the objective lens is a safety measure. Why?
- To prevent damage to the slide or lens. ✓
- To make sure the slide stays in place.
- To make sure the stage isn’t moved too quickly.
- To make sure the slide is in focus.
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- Which of these should be present in a scientific drawing?
- Shading to give a 3D effect
- Sketched lines
- Labels ✓
- No labels
- Labels with arrows
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- Scientific drawings often show the magnification used to see the object drawn. If the eyepiece lens is x10 and a x20 objective lens is used, what is the total magnification?
- x10
- x20
- x30
- x200 ✓
- x2000
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The diagram shows a root hair cell. How does the 'hair' help the root hair cell do its job?- The 'hair' is thin.
- The 'hair' is sensitive to touch.
- The 'hair' makes the cell bigger.
- The 'hair' increases the surface area of the cell. ✓
- The 'hair' keeps the cell warm.
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- A light microscope can be used to observe plant root hair cells.
- The parts of a light microscope and their functions.
- The sequence of steps for setting up a light microscope to observe cells including changing the magnification and focus.
- Observations from a light microscope can be recorded in a labelled scientific line drawing.
- Total magnification = magnification of the eyepiece lens × magnification of the objective lens
Common misconception
Incorrectly calculating the total magnification by adding the magnification of the eyepiece lens to the magnification of the objective lens.
The correct way to calculate the total magnification (by multiplying the magnification of the eyepiece lens by the magnification of the objective lens) is practiced.
Keywords
Light microscope - an instrument that uses visible light and lenses to magnify a viewed specimen
Lens - a glass or plastic disc that refracts light to increase magnification
Focus - focus means to make an image sharper and clearer
Magnification - the number of times greater in size the viewed object is compared to its actual size
Root hair cell - a specialised plant cell found in the roots that absorb water and nutrients into the plant
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