Assertion: leaf's layer | /r/HasProperty | spongy mesophyll tissue
Facets:
Source sentences:
text: The lower layer of mesophyll, the spongy mesophyll tissue, is composed of loosely arranged parenchyma cells with abundant air space.
text: The upper section is termed the palisade parenchyma and consists chiefly of elongated columnar parenchyma cells that contain three to five times the number of chloroplasts as the cells that comprise the lower layer, known as the spongy parenchyma.