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Draw a labelled diagram of a transverse section (T.S.) of a dicotyledonous (dicot) stem - Leaving Cert Agricultural Science - Question b - 2019
Question b
Draw a labelled diagram of a transverse section (T.S.) of a dicotyledonous (dicot) stem. Outline two differences to be seen in the transverse sections of monocot an... show full transcript
Worked Solution & Example Answer:Draw a labelled diagram of a transverse section (T.S.) of a dicotyledonous (dicot) stem - Leaving Cert Agricultural Science - Question b - 2019
Step 1
Draw a labelled diagram of a transverse section (T.S.) of a dicotyledonous (dicot) stem.
Answer
To draw a labelled diagram of a transverse section of a dicot stem:
- Outline the Shape: Start with a circular outline to represent the outer surface of the stem.
- Internal Structure: Inside the circumference, draw a central strip to represent the pith and surrounding areas divided into vascular bundles. Each bundle should appear as an oval shape.
- Label the Parts: Include labels for each part:
- Epidermis: The outermost layer.
- Cortex/Pith: The central part of the stem, you can label it as pith.
- Vascular Bundles: Label the bundles which contain both xylem and phloem.
- Cambium: The layer between the xylem and phloem that is responsible for secondary growth.
Step 2
Outline two differences to be seen in the transverse sections of monocot and dicot stems.
Answer
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Arrangement of Vascular Bundles:
- Monocot Stems: Vascular bundles are scattered throughout the stem.
- Dicot Stems: Vascular bundles are arranged in a ring formation.
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Secondary Growth:
- Monocot Stems: Typically show no cambium or secondary thickening, thus lacking annual rings.
- Dicot Stems: Contains cambium, allowing for secondary growth, leading to the presence of annual rings.