Q. 55.0( 3 Votes )
Match the items in column I with those in column II.
(a) Xylem – upward flow of water
It is the part of the vascular bundles which conducts water and minerals from the soil to the leaves. This can be observed if one removes a cylindrical part xylem from the twig the leaves of the twig wilts due to loss of water. Thus one can say xylem is concerned with the upward flow of water.
(b) Phloem – downward flow of sap
It is the part of the vascular bundles which conducts glucose from the leaves to the other parts of the plant. This can be observed if one removes a ring of phloem from the twig the upper edge swells up after some time. Thus one can say phloem is concerned with the downward flow of sap.
(c) Cell membrane – semi-permeable
The type of membrane which allows the passage of solvent molecules and blocks the passage of solutes is known as a semi-permeable membrane. In case of the cell membrane, it allows the passage of water and minerals ions but blocks the passage of large molecules and germs. Thus it acts as a semi-permeable membrane.
(d) Root pressure – guttation
Root pressure is the pressure developed by the inflow of water during transpiration due to suction pull in the roots. This intake of excess water accumulates in the cells and oozes out early in the morning through special structures known as hydathodes, in form of water droplets.
(e) Cell wall – permeable
Cell wall is a highly porous structure that gives passage to large solute molecules and other elements. Also, the pours are larger in size than the pours found in a semi-permeable membrane.
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