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Distribution-free tests are used when there is a concern that the assumptions underlying parametric tests may be violated.
Mesophyll
The inner tissue of a leaf, containing chlorophyll where photosynthesis takes place, typically between the upper and lower epidermis.
Casparian Strip
A band of cell wall material found in the roots of plants, impregnated with suberin and lignin, that controls the flow of water and solutes into the xylem.
Vascular Cylinder
A central part of the root of plants where xylem and phloem tissues are located, responsible for the transport of water, nutrients, and other substances.
Companion Cells
Specialized cells in the phloem of plants that are closely associated with sieve tube elements and assist with the transport of photosynthetic products.
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