<span>Grasslands are one of the most widespread of all the major vegetation types of the world. This is so, however, only because human manipulation of the land has significantly altered the natural vegetation, creating artificial grasslands of cereal crops, pastures, and other areas that require some form of repetitious, unnatural disturbance such as cultivation, heavy grazing, burning, or mowing to persist. This discussion, however, concentrates on natural and nearly natural grasslands.
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In summer, the amount of green pigment and chlorophyll are much more, in fall, the amount of chlorophyll and green pigment is less. That's the reason the leaves turn colors.
The process which does not require any energy from the cell is called facilitated diffusion. It <span>is the process of spontaneous passive transport of molecules or ions across a cell's membrane via specific transmembrane integral proteins. Hope this answers the question.</span>
