Botany or Plant Biology

Why are the cells of the spongy layer packed so loosely together?

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April 08, 2011 1:43AM

All plant cells respire all of the time and need to exchange gases. The main gas exchange surface in plants are the spongy mesophyll cells in the leaves. Leaves have a huge surface area, and the irregular-shaped, loosely-packed spongy cells increase the area for gas exchange even more.