THE PERFORATED TRANSVERSE WALL OF SIEVE TUBE ELEMENT IS CALLED
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Explanation:
A set of perforations in the wall area of a sieve tube is called a sieve area. The sieve tube is closely associated with a companion cell.
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Explanation:
Convection is the transfer of heat due to the bulk movement of molecules within fluids, including molten rock. Convection includes sub-mechanisms of advection, and diffusion. Convection cannot take place in most solids because neither bulk current flows nor significant diffusion of matter can take place.
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