A student investigated mitosis in the root tip of a garlic plant - Edexcel - GCSE Biology Combined Science - Question 1 - 2019 - Paper 1
Question 1
A student investigated mitosis in the root tip of a garlic plant.
(i) Explain why the student used the tip of the root.
(ii) The student squashed the root tip on a... show full transcript
Worked Solution & Example Answer:A student investigated mitosis in the root tip of a garlic plant - Edexcel - GCSE Biology Combined Science - Question 1 - 2019 - Paper 1
Step 1
Explain why the student used the tip of the root.
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Answer
The student used the tip of the root because it contains meristematic or dividing cells, which are actively undergoing mitosis. This region is essential for growth as it is where new cells are produced.
Step 2
Describe how to use the microscope to obtain a clear image of the cells.
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Answer
To obtain a clear image of the cells using a microscope, you should:
Switch the lamp on to illuminate the slide.
Start with the lowest objective lens and look through the eyepiece lens.
Use the focusing wheel to adjust and obtain a clear image of the cells.
Step 3
State what can be added to the root tip squash to make the chromosomes visible.
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To make the chromosomes visible, a stain or named stain, such as iodine, can be added to the root tip squash.
Step 4
Which stage of mitosis is shown in Figure 1?
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The stage of mitosis shown in Figure 1 is metaphase.
Step 5
Describe what is happening in Figure 1.
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In Figure 1, the chromosomes are aligned along the metaphase plate in the center of the cell. The spindle fibers have attached to the centromeres of the chromosomes, preparing them for separation into two daughter cells.
