Cross section

Cross section [ Botany ]
Synonym: Transversal section

Dictionary of botanic terminology
index of names

A section cut at a right angle to any long, narrow organ or structure.

If we imagine cutting a section along the width (or middle) of a structure, the resulting cut surfaces (or slices) are referred to as cross sections.

Compare with: longitudinal section

Left: The cross section of a tree trunk.

Cross section Synonym: Transversal section


	*A diagram, photograph or drawing that shows what something looks like after being cut from one side to the other, perpendicular to its center line..*

Cross section [ Physycs ]


	*In physics a cross section represents the probability of an interaction event between two particles.*

Cross section [ Geometry ]


	In geometry, a cross section is the intersection of a body in 3-dimensional space with a plane, or of a body in 2-dimensional space with a line, etc. More plainly, when cutting an object into slices one gets many parallel cross sections

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Holdfast roots [ Botany ]
Dictionary of botanic terminology - index of names

Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.

Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans), develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994