. Agriculture for southern schools. partsor cells of which the plant consists. We may think of aplant cell as a tiny room, too smalleven to be seen without a powerfulmicroscope. But this little room orcell has no doors nor windows norother openings into it. It is com-pletely lined on the inside with alayer of living jelly-like layer lets water and the materialdissolved in water soak through itand thus pass to the inside of the. cell. An important fact to remem-ber is that the water passes in, butwill not pass out into the soil againwhile the plant is healthy. This ispartly becaus
. Agriculture for southern schools. partsor cells of which the plant consists. We may think of aplant cell as a tiny room, too smalleven to be seen without a powerfulmicroscope. But this little room orcell has no doors nor windows norother openings into it. It is com-pletely lined on the inside with alayer of living jelly-like layer lets water and the materialdissolved in water soak through itand thus pass to the inside of the. cell. An important fact to remem-ber is that the water passes in, butwill not pass out into the soil againwhile the plant is healthy. This ispartly because the water in the soil is more dilute thanthe sap which fills the plant cell; and also because thedilute soil water can flow in through the cell lining morerapidly than the denser sap inside can flow out intothe soil. This flow of water towards the sap or denserliquid helps to force water upward from the roots. Theleaves assist in the upward flow, for water must riseto take the place of that which the leaves give off intothe Fig. 26. — Showing thatWater is thrown off FROM THE LeA\ES OF Gro^wng Plants 30 AGRICULTURE
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