The diagram shows part of a transverse section through a dicotyledonous stem - Leaving Cert Biology - Question c - 2006
Question c
The diagram shows part of a transverse section through a dicotyledonous stem.
(i) Copy the diagram into your answer book and identify each of the following by placi... show full transcript
Worked Solution & Example Answer:The diagram shows part of a transverse section through a dicotyledonous stem - Leaving Cert Biology - Question c - 2006
Step 1
Copy the diagram into your answer book and identify each of the following by placing the appropriate letter on your diagram: phloem P, ground tissue G, xylem X, dermal tissue D.
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Answer
The four labels on the diagram should be clearly indicated as follows:
P for phloem
G for ground tissue
X for xylem
D for dermal tissue
Ensure each label is placed in its corresponding position in the diagram.
Step 2
In which of the tissues that you have identified are sugars mainly transported?
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Answer
Sugars are mainly transported in the phloem (P). This tissue is responsible for the translocation of nutrients and organic compounds, primarily photosynthates.
Step 3
State a function of D.
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The function of dermal tissue (D) includes providing protection to the plant, aiding in water loss regulation, and serving as a barrier to infection or disease. It can also help maintain turgor pressure.
Step 4
1. What did you use to cut the section?
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A blade or scalpel was used to cut the section of the stem, ensuring a clean and precise cut.
Step 5
2. How did you support the stem while you were cutting the section?
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The stem was supported using a pith holder or held in place by hand to stabilize it during the cutting process.
Step 6
3. How did you transfer the section to a microscope slide?
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To transfer the section to a microscope slide, a mounted needle or section lifter was used, or forceps/painbrush could have been employed to handle the delicate cut.
Step 7
State one way in which a transverse section through a monocotyledonous stem differs from the one that you cut.
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Answer
In a transverse section of a monocotyledonous stem, the vascular bundles are scattered throughout the stem tissue rather than arranged in a ring, which is typical for dicotyledonous stems.
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