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Draw a clearly labelled diagram of the internal structure of a leaf - Leaving Cert Agricultural Science - Question c - 2013
Question c
Draw a clearly labelled diagram of the internal structure of a leaf. List four features of a leaf that enable it to maximise photosynthesis.
Worked Solution & Example Answer:Draw a clearly labelled diagram of the internal structure of a leaf - Leaving Cert Agricultural Science - Question c - 2013
Step 1
Draw a clearly labelled diagram of the internal structure of a leaf.
Answer
To draw the internal structure of a leaf, include the following key components, ensuring to label each part clearly:
- Cuticle: A waxy layer that reduces water loss.
- Upper Epidermis: Protects the leaf and allows light to pass through.
- Palisade Layer: Contains tightly packed chloroplasts for maximum light absorption.
- Spongy Layer: Allows for gas exchange and contains chloroplasts, but fewer than the palisade layer.
- Air Spaces: Provide room for gases to circulate.
- Stomata: Small openings that facilitate gas exchange (CO2 and O2).
- Lower Epidermis: Protects the leaf and contains guard cells.
- Vascular Bundle: Comprises xylem and phloem for the transport of water and nutrients.
Step 2
List four features of a leaf that enable it to maximise photosynthesis.
Answer
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Flat Shape: Maximizes surface area to absorb sunlight effectively.
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Waxy Cuticle: Prevents water loss and retains moisture.
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High Concentration of Chloroplasts: Concentrated in the palisade layer for maximum light absorption.
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Presence of Stomata: Allows gas exchange (O2 and CO2) to support the photosynthesis process.