alleryStart learning →Which mesophyll layer is built from column shaped, tightly packed cells?
AThe spongy parenchyma
BThe palisade parenchyma
CThe epidermal parenchyma
DThe vascular parenchyma
Answer & Solution
Correct answer: B. The palisade parenchyma
1. The mesophyll of most dicot leaves has two parenchyma arrangements.
2. The palisade parenchyma has column shaped, tightly packed cells and may be one, two or three layers deep.
3. Below it lie the loosely arranged, irregularly shaped cells of the spongy parenchyma.
4. The air spaces between spongy cells allow gas exchange with the atmosphere through the stomata, so that layer is the loose one.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.4 Leaves_
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