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mesophyll
This term is a specialized botanical descriptor used primarily in scientific, academic, and biological contexts. It describes the functional interior of a leaf, distinguishing the photosynthetic tissue from the protective outer epidermal layers. Because it refers to a specific anatomical region of a plant, it is rarely encountered in casual conversation and is almost exclusively found in textbooks or research papers.
In a biological context, the term encompasses both the palisade and spongy layers. While it can be used as a collective mass noun to describe the tissue as a whole, it is occasionally treated as a countable noun when referring to the mesophyll of different species or specific leaf samples.
Meanings
Examples
The mesophyll is where most of the photosynthesis takes place in a leaf.
Look closely at the slide to see the spongy mesophyll cells.
Carbon dioxide diffuses through the stomata into the mesophyll.
I wonder if the mesophyll structure differs between sun leaves and shade leaves.
The palisade mesophyll is tightly packed to maximize light absorption.
Water moves from the veins into the surrounding mesophyll tissue.
Does the mesophyll layer vary in thickness across different plant species?
The chloroplasts are concentrated in the upper mesophyll for efficiency.
The chloroplasts are concentrated in the upper mesophyll for efficiency.