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14. Transport eLearn.Punjab
Most of ions are taken up by the roots by the process of active transport. By this method plants
can take a mineral that is in higher concentration inside the root cells than in the soil solution. In
this process molecules and ions move from their low concentration to their higher concentration
(i.e. against the concentration gradient), through cell membrane, by the use of energy in the form
of ATP. Active transport is selective and is dependent on respiration. Some ions move by passive as
well as by active transport.
Fig.14.1 Mineral and water uptake by roots. The Casparian strip separates the extracellular space in the root into two compartments:
an outer compartment that is continuous with the soil water, and an inner compartment that is continuous with the inside of the
conducting cells of the xylem. The black lines show a pathway for both water and mineral; the blue line is an alternative pathway for
water alone.
Animation 14.2: transpul V: 1.1
Source and Credit: msseconisseniorbiology
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