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 cells, which are actively dividing cells. These regions are crucial for growth as they are responsible for elongation and development of the root structure.
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 using the microscope, first, switch the lamp on or adjust the mirror to illuminate the slide properly. Start with the lowest objective lens to get a broad overview, looking through the eyepiece lens. Gradually switch to higher objective lenses, using the focusing wheel to achieve 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 like iodine can be added to the root tip squash.
Step 4
Which stage of mitosis is shown in Figure 1?
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Answer
B metaphase
Step 5
Describe what is happening in Figure 1.
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Answer
In Figure 1, the chromosomes are aligned along the metaphase plate in the center of the cell. The spindle fibers are attached to the centromeres of the chromosomes, preparing to pull the sister chromatids apart during anaphase.
