Draw a labelled diagram of a transverse section through a leaf - Leaving Cert Biology - Question 14(b) - 2018
Question 14(b)
Draw a labelled diagram of a transverse section through a leaf.
Place the letter X on your diagram, to show the part of the leaf in which most photosynthesis occurs... show full transcript
Worked Solution & Example Answer:Draw a labelled diagram of a transverse section through a leaf - Leaving Cert Biology - Question 14(b) - 2018
Step 1
Draw a labelled diagram of a transverse section through a leaf.
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Answer
The diagram should include:
Upper epidermis
Lower epidermis
Palisade mesophyll
Spongy mesophyll
Vascular bundle (xylem and phloem)
Stomata with guard cells.
Make sure to use a neat and clear labeling method to identify each part.
Step 2
Place the letter X on your diagram, to show the part of the leaf in which most photosynthesis occurs and explain why it occurs mostly there.
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Answer
X should be placed on the palisade layer, as this area contains a high concentration of chloroplasts, allowing it to capture more sunlight for photosynthesis.
Step 3
State two other ways in which the leaf is well adapted for photosynthesis.
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The leaf has a large surface area which helps capture more sunlight.
The thinness of the leaf allows gases to diffuse in and out easily.
Step 4
Name three substances which are involved in leaf metabolism and which pass through the stomata.
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Carbon dioxide
Oxygen
Water vapor
Step 5
The concentration of which gas influences the diameter of the stomata?
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The concentration of carbon dioxide influences the diameter of the stomata. Higher concentrations lead to stomata opening, while lower concentrations cause them to close.
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