Observation of a transverse section of a dicotyledonous stem reveals vascular and other tissues - Leaving Cert Biology - Question 8 - 2004
Question 8
Observation of a transverse section of a dicotyledonous stem reveals vascular and other tissues. Name two of the tissues that are not vascular tissues.
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Worked Solution & Example Answer:Observation of a transverse section of a dicotyledonous stem reveals vascular and other tissues - Leaving Cert Biology - Question 8 - 2004
Step 1
State one reason why you used an herbaceous stem rather than a woody one.
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Answer
An herbaceous stem is easier to cut into thin sections compared to a woody stem, which is typically rigid and difficult to slice.
Step 2
Explain how you cut the section.
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To cut the section, use a sharp blade or a microtome. Ensure that the stem is fixed in a firm support for stability. Position the stem horizontally and slice it at a right angle to the axis, aiming for uniform thinness to allow light to pass through.
Step 3
Why is it desirable to cut the section as thinly as possible?
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Cutting the section thinly allows light to pass through more easily, which enhances visibility of the cellular structures under a microscope. This is crucial for clear observation of the vascular tissues.
Step 4
Draw a diagram of the section as seen under the microscope. Label the vascular tissues that can be seen.
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Answer
The diagram should depict a transverse section of a dicotyledonous stem with vascular bundles arranged in a ring. Label the xylem and phloem clearly, ensuring that at least one bundle is divided for clarity.
Step 5
State one precise function of each of the vascular tissues labelled in your diagram.
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The function of the phloem is to transport food (sugars and nutrients) throughout the plant. The function of the xylem is to transport water and minerals from the roots to the leaves.
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