Editing Shade (shadow)

{{more citations needed|date=June 2016}}

[[File:Tree shadows on moss (Unsplash).jpg|thumb|The understory of moss is in the shade caused by the trees shadow.]]

'''Shade''' is the blocking of [[sunlight]] (in particular direct sunshine) by any object, and also the shadow created by that object. It may refer to blocking of sunlight by a [[roof]], a [[tree]], an [[umbrella]], a [[window blind|window shade or blind]], [[Yakhchāl#shade walls|wall]], [[curtain]]s, or other objects.

==As a resource==
[[File:Sun Safety for Infants (7437141042).jpg|thumb|left|Safety from the Sun for infants]]

In [[temperate]] and [[tropical]] zones (most places on Earth), shade is an important issue in providing cooling and shelter from [[heatstroke|harmful heat]] and [[ultraviolet]] emitted by the Sun.

==Plants==
Green plants produce shade by absorbing sunlight to invest as energy in [[photosynthesis]] to produce [[carbohydrate|sugar]]. They also actively [[transpiration|transpire]], producing an additional cooling effect.

In gardening terms, there are various types of shade:
*Full sun – more than five hours of direct sun per day.
*Part shade – two to five hours of direct sun, or all-day ''{{vanchor|dappled sun|dappled sunlight}}'' (sunlight shining through open trees).
*Full shade – less than two hours of direct sun per day.

Under a dense forest [[Canopy (biology)|canopy]], [[Brightness|light intensity]] can be very low. Special [[adaptation]]s produce the [[shade tolerance]] that allows plants to survive in the [[understory]].
In addition, shade within a canopy can elicit shade avoidance responses whereby plants elongate their [[Shoot (botany)|shoot]]s in order to reach light for optimal [[photosynthesis]].<ref>Debatosh Das,[http://www.plantphysiol.org/content/early/2016/06/21/pp.16.00725.abstract "Ethylene- and shade-induced hypocotyl elongation share transcriptome patterns and functional regulators"], "Plant Physiology",21-06-2016</ref>

==See also==
*[[Shade tree]], a large tree that provides shade

{{Natural resources}}

==References==
{{Reflist}}

[[Category:Light]]
[[Category:Shading]]