a) The diagram shows the structure of part of a stem - Leaving Cert Biology - Question 14 - 2006
Question 14
a) The diagram shows the structure of part of a stem.
(i) Identify A, B, C and D.
(ii) What is a meristem?
(iii) Give a location of a meristem in the diagram.
(i... show full transcript
Worked Solution & Example Answer:a) The diagram shows the structure of part of a stem - Leaving Cert Biology - Question 14 - 2006
Step 1
Identify A, B, C and D.
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Answer
A = terminal or apical bud, B = leaf scar, C = scale, girdle or growth scar, D = lateral or axillary bud.
Step 2
What is a meristem?
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Answer
A meristem is a region of actively dividing cells responsible for growth in plants. It can be found at the tips of roots and stems or in the cambium layer.
Step 3
Give a location of a meristem in the diagram.
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Answer
In the diagram, the meristem can be located at A, which is the terminal bud at the top of the stem.
Step 4
How many years’ growth are shown in the diagram? Explain your answer.
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The diagram shows two years of growth. This is indicated by the presence of annual rings, which suggest each ring corresponds to a year of growth.
Step 5
Give two functions of a stem.
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Transport of water, minerals, and nutrients between the roots and leaves. 2. Support for leaves, flowers, and fruits to maximize light exposure.
Step 6
Identify tissues A and B.
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A = xylem, B = phloem.
Step 7
To which tissue type do A and B belong?
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A belongs to vascular tissue type and B also belongs to vascular tissue type.
Step 8
Identify cells L and M and part N in tissue B.
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L = companion cell, M = sieve tube, N = sieve plate.
Step 9
Name a substance transported in tissue B.
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Answer
Glucose or amino acids are transported in phloem (tissue B).
Step 10
Name a substance transported in tissue B.
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Answer
Water and named mineral minerals are transported in xylem (tissue A).
Step 11
Tissue A has another function in addition to transport. What is this other function?
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Tissue A (xylem) also provides structural support to the plant.
Step 12
Where in a young root would you find tissues A and B?
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In a young root, tissues A and B can be found in the central region, often forming a vascular bundle.
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