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Transport of water and minerals in plants takes place through xylem tissue where vessels and tracheids of roots, stems and leaves are interconnected. This forms a continuous system of channels reaching all plant parts. Simple physical forces are involved in the process.
If the soil has adequate water, name and explain which force will be acting effectively at :
(i) Night
(ii) Day
If the soil has adequate water, name and explain which force will be acting effectively at :
(i) Night
(ii) Day
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(i) Night- root pressure : The effect of root pressure is more at night for transport of water because of concentration difference between root and the soil. (½+½ Mark)
(ii) Day-transpiration pull: During the day, the evaporation of water molecule from the cell of a leaf creates a suction (transpiration pull) which pull water from xylem cells of the root. (½+½ Mark)
(ii) Day-transpiration pull: During the day, the evaporation of water molecule from the cell of a leaf creates a suction (transpiration pull) which pull water from xylem cells of the root. (½+½ Mark)