2 (a) A student investigated mitosis in the root tip of a garlic plant - Edexcel - GCSE Biology - Question 2 - 2019 - Paper 1
Question 2
2 (a) 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... show full transcript
Worked Solution & Example Answer:2 (a) A student investigated mitosis in the root tip of a garlic plant - Edexcel - GCSE Biology - Question 2 - 2019 - Paper 1
Step 1
Explain why the student used the tip of the root.
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Answer
The student selected the tip of the root because it contains meristematic tissue, where active cell division occurs. This area is crucial for plant growth and is rich in dividing cells, which are necessary for studying mitosis.
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 the microscope, the student should first switch the lamp on to illuminate the slide. Next, they should start with the lowest objective lens and look through the eyepiece lens. Finally, they need to use the focusing knob to adjust until a clear image of the cells is visible.
Step 3
State what can be added to the root tip squash to make the chromosomes visible.
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Answer
To make the chromosomes visible, a stain such as iodine or acetic orcein can be added to the root tip squash.
Step 4
Which stage of mitosis is shown in Figure 2?
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Answer
The stage of mitosis shown in Figure 2 is metaphase.
Step 5
Describe what is happening in Figure 2.
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Answer
In Figure 2, the chromosomes are aligned at the cell's equatorial plane, also known as the metaphase plate. The spindle fibers are attached to the centromeres of the chromosomes, preparing them for separation. This stage is critical as it ensures that each daughter cell will receive an equal set of chromosomes during the next phase of mitosis.
