Search results
Results From The WOW.Com Content Network
1) An increased rate of evaporation due to a temperature rise will hasten the loss of water. 2) Decreased relativehumidity outside the leaf will increase the water potential gradient. Relative humidity. Drier surroundings give a steeper water potential gradient, and so increase the rate of transpiration. Wind.
The basic function of the xylem is to transport water from roots to stems and leaves, but it also transports nutrients. [ 1][ 2] The word xylem is derived from the Ancient Greek word ξύλον ( xylon ), meaning "wood"; the best-known xylem tissue is wood, though it is found throughout a plant. [ 3]
Seed dispersal. In spermatophyte plants, seed dispersal is the movement, spread or transport of seeds away from the parent plant. [ 1] Plants have limited mobility and rely upon a variety of dispersal vectors to transport their seeds, including both abiotic vectors, such as the wind, and living ( biotic) vectors such as birds.
Phloem (/ ˈ f l oʊ. əm /, FLOH-əm) is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and known as photosynthates, in particular the sugar sucrose, [1] to the rest of the plant. This transport process is called translocation. [2]
In plants, the transpiration stream is the uninterrupted stream of water and solutes which is taken up by the roots and transported via the xylem to the leaves where it evaporates into the air/ apoplast -interface of the substomatal cavity. It is driven by capillary action and in some plants by root pressure.
Vascular tissue is a complex conducting tissue, formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the xylem and phloem. These two tissues transport fluid and nutrients internally. There are also two meristems associated with vascular tissue: the vascular cambium and the cork cambium.
It is achieved through very complex and well-coordinated active transport of auxin molecules from cell to cell throughout the plant body—by the so-called polar auxin transport. [5] Thus, a plant can (as a whole) react to external conditions and adjust to them, without requiring a nervous system. Auxins typically act in concert with, or in ...
Active transport. In cellular biology, active transport is the movement of molecules or ions across a cell membrane from a region of lower concentration to a region of higher concentration —against the concentration gradient. Active transport requires cellular energy to achieve this movement. There are two types of active transport: primary ...