Read Leaf and Petiole Adaptations
A focused NSEB read for the leaf and petiole adaptations pattern. Learn the linked concept, then apply it in the source questions.
Living-system questions are solved by matching a structure or organism to its function, process and stated condition.
Leaf Cross Section
Upper and lower surfaces orient vascular bundle. In the micrograph, side I corresponds to the lower/abaxial surface and side II to the upper/adaxial surface based on the position of glandular hairs, epidermal architecture and internal tissue orientation.
Petiole Cross Section
Air spaces indicate low-oxygen aquatic adaptation. Large air-filled lacunae in the petiole are characteristic of aerenchyma, an adaptation that facilitates internal gas exchange and buoyancy in waterlogged or oxygen-poor environments. Therefore the plant can survive in low-oxygen conditions.
Grass Leaf Cross Section
Leaf anatomy reflects water availability. The grass-leaf cross section shows classic xerophytic adaptations: thick cuticle, stomata sunken in grooves, hinge cells and a humid internal microenvironment. These features reduce water loss and are characteristic of a xerophyte. Answer A. Page 5 Part A₂ - Multiple Correct For Q₂₅-Q₃₂, all correct alternatives must be selected and no in
OlympIQ exam lens
- ✓Upper and lower surfaces orient vascular bundle
- ✓Air spaces indicate low-oxygen aquatic adaptation
- ✓Leaf anatomy reflects water availability
Read the conditions in the stem carefully and use the stated model, labels, or assumptions before choosing an answer.
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