1. A student investigated mitosis in the root tip of a garlic plant - Edexcel - GCSE Biology Combined Science - Question 1 - 2019 - Paper 1
Question 1
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 o... show full transcript
Worked Solution & Example Answer:1. 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 actively dividing cells in the meristem, which are essential for growth.
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, follow these steps:
Switch on the lamp or adjust the mirror to ensure proper lighting.
Start with the lowest objective lens for a wider view. Look through the eyepiece lens.
Gradually use the focusing wheel to refine the image until it is clear.
Step 3
State what can be added to the root tip squash to make the chromosomes visible.
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A stain such as iodine can be added to the root tip squash to make the chromosomes visible.
Step 4
Which stage of mitosis is shown in Figure 1?
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Answer
The stage of mitosis shown in Figure 1 is metaphase.
Step 5
Describe what is happening in Figure 1.
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Answer
In Figure 1, the chromosomes are aligned at the metaphase plate, with each chromosome consisting of two sister chromatids. The spindle fibers are attached to the centromeres, preparing for the separation of the chromatids during the next stage of mitosis.
