The diagram shows a transverse section through the stem of a monocotyledonous (monocot) plant - Leaving Cert Biology - Question 5 - 2012
Question 5
The diagram shows a transverse section through the stem of a monocotyledonous (monocot) plant.
(a) What is meant by the term monocotyledonous?
(b) Give an example ... show full transcript
Worked Solution & Example Answer:The diagram shows a transverse section through the stem of a monocotyledonous (monocot) plant - Leaving Cert Biology - Question 5 - 2012
Step 1
What is meant by the term monocotyledonous?
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Answer
The term monocotyledonous refers to plants that have one seed leaf or one embryonic leaf in their seeds. This is a characteristic feature of monocots, which distinguishes them from dicots, which have two seed leaves.
Step 2
Give an example of a monocotyledonous plant.
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Answer
An example of a monocotyledonous plant is wheat.
Step 3
Name the structures labelled A.
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Answer
The structures labelled A are vascular bundles.
Step 4
How do you know from the diagram that the section is taken from:
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Answer
The presence of multiple vascular bundles scattered throughout the section indicates that it is taken from a stem of a monocot.
(i) a stem? The presence of vascular bundles arranged throughout the section shows that it is indeed a stem.
(ii) a monocot? The arrangement of the vascular bundles being scattered rather than in a ring formation points out that it is a monocot.
Step 5
How are the veins arranged in the leaves of monocots?
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Answer
In monocots, the veins in the leaves are arranged in a parallel manner.
Step 6
How does the vein arrangement in the leaves of dicot plants differ from that in monocots?
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Answer
The vein arrangement in the leaves of dicot plants differs from that in monocots as dicots typically have a reticulate, net-like or branched arrangement of veins.
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