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.
1.
2.
(b... show full transcript
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
Using an herbaceous stem is advantageous as it is easier to cut thin sections, which allows for better visibility of the vascular bundles under the microscope.
Step 2
Explain how you cut the section.
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To cut the section, a sharp blade or microtome is used to slice through the stem carefully, maintaining a right angle to prevent damaging the samples. It is important to support the stem properly to ensure even and thin sections are obtained.
Step 3
Why is it desirable to cut the section as thinly as possible?
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Cutting the section as thinly as possible is essential to allow light to pass through, which enhances visibility of cellular structures and enables clear observation under the microscope.
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 illustrate a transverse section of a dicotyledonous stem, showing vascular bundles. The vascular tissues should be labelled as follows:
Xylem
Phloem
Step 5
State one precise function of each of the vascular tissues labelled in your diagram.
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Phloem: transports food (or minerals or auxins).
Xylem: transports water and minerals.
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