A student cut a piece of onion and placed it on a microscope slide - Edexcel - GCSE Biology Combined Science - Question 4 - 2018 - Paper 1
Question 4
A student cut a piece of onion and placed it on a microscope slide.
The student then placed this slide on the stage of a light microscope and looked through the eyep... show full transcript
Worked Solution & Example Answer:A student cut a piece of onion and placed it on a microscope slide - Edexcel - GCSE Biology Combined Science - Question 4 - 2018 - Paper 1
Step 1
Explain two ways this method could be improved to see details of the onion cells.
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Answer
Use a thin layer of onion slice: By ensuring that a single, thin layer of onion is used, light can pass through more easily, allowing for better visibility of the cells.
Adjust microscope settings: Increasing the magnification or focusing the microscope better can help to see the cells and their structures clearly.
Step 2
Which part of a plant has rapidly dividing cells?
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Answer
B meristem
Step 3
Which stage of mitosis is shown in cell R?
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A prophase
Step 4
Describe two genetic similarities of the new cells that would be produced by cell Q in Figure 4.
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Answer
Both new cells will have the same genetic information since they are produced via mitosis.
They will each contain identical DNA copies, ensuring they maintain the same genetic characteristics.
Step 5
State two safety precautions that should be taken when heating hydrochloric acid.
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Wear goggles to protect the eyes from splashes.
Avoid direct contact with the acid by using appropriate gloves.
Step 6
Explain one advantage of using an electron microscope to observe plant cells.
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Answer
One advantage of using an electron microscope is that it offers higher resolution, allowing for more detail to be seen compared to a light microscope.
