(i) Draw a diagram of a section through a leaf - Leaving Cert Biology - Question b - 2007
Question b
(i) Draw a diagram of a section through a leaf. Label a stoma and a guard cell.
(ii) Give a function of the guard cell.
(iii) Name two gases that enter or leave th... show full transcript
Worked Solution & Example Answer:(i) Draw a diagram of a section through a leaf - Leaving Cert Biology - Question b - 2007
Step 1
Draw a diagram of a section through a leaf. Label a stoma and a guard cell.
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Answer
A diagram should be drawn showing a cross-section of a leaf, including the following parts: epidermis or cuticle, rectangular mesophyll cells, air spaces, a stoma, and guard cells. The stoma should be depicted in the center of the diagram, flanked by the guard cells, which regulate its opening and closing.
Step 2
Give a function of the guard cell.
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Answer
The guard cells control the size of the stomatal opening, thus regulating the passage of gases, such as carbon dioxide, oxygen, and water vapor, in and out of the leaf.
Step 3
Name two gases that enter or leave the leaf.
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Answer
Carbon dioxide
Oxygen
Additionally, water vapor is another gas that can exit the leaf.
Step 4
Name the process by which the gases move in or out of the leaf.
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Answer
The gases move in and out of the leaf primarily through diffusion or passive transport.
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