Final Answer:
The diagram is already correctly labeled with all the terms in their proper positions:
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waxy cuticle → topmost layer, covering the upper epidermis
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upper epidermis → layer just below the waxy cuticle
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palisade mesophyll → tightly packed cells beneath the upper epidermis
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spongy mesophyll → loosely arranged cells with air spaces below palisade layer
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lower epidermis → bottom layer of leaf tissue
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stoma → opening in the lower epidermis (singular; plural = stomata)
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guard cell → two cells surrounding each stoma that control its opening
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chloroplast → green organelles inside palisade and spongy mesophyll cells (also shown in guard cells)
The fill-in-the-blank sentences are also correctly completed as shown:
1. The cells in the
upper epidermis contain no chloroplasts and are transparent to allow light to penetrate into the leaf.
2. The
palisade mesophyll cells are packed tightly together near the top of the leaf to collect as much sunlight as possible. They contain many chloroplasts and most photosynthesis takes place in these cells.
3. The
spongy mesophyll cells contain air spaces to allow the movement of gases (i.e. carbon dioxide and oxygen) throughout the leaf.
4. The
guard cell helps to regulate the movement of gases into and out of the leaf. They also help to control the loss of water vapour (transpiration).
5. The stomata are found in the
lower epidermis. Besides the guard cells the cells in this layer contain no chloroplasts.
✔ All answers match standard plant biology knowledge and are consistent with the labeled diagram.
Parent Tip: Review the logic above to help your child master the concept of leaf structure worksheet.
