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The main absorbing organs of plants are roots and leaves.
Roots absorb water and inorganic salts absorbed in large
quantities while various inorganic salts are absorbed in
small amount in the from if dilute solution by the process
of osmosis.
Oxygen and Carbon dioxide of air is utilized by
plants. Oxygen is absorbed and utilized by all living cells
of plants for its respiration but carbon dioxide is absorbed
only by the green cells for manufacture of food material.
Osmosis :-By process of osmosis we mean, the selective
transmission of a solvent in preference to solute through a
membrane called semipermeable membrane.
Osmotic pressure :-It is that pressure till the osmosis
continues, as hydrostatic pressure due to accumulated flow
of solvent. It is the maximum value to stop the further
flow. The osmosis pressure is greater if the concentration
if a solution is high.
Importance of Osmosis in life pf plants:- Root hairs absorb
water from the soil through this process. parenchymatous
cells absorb water from xylem vessels through this process
Osmosis gives turgidity to plant with the result some kinds
of movements are observed in plant organs.
Turgidity:- It is the condition when cell absorbs more and
more of water by osmosis with the result protoplasm is
pushed outward against cell wall. Cell wall is also in state
of tension as there is excess of water on the cell. During
Turgidity two pressures are observed.
(1)Turger pressure or outward pressure:-Which is exerted on
the cell wall by fluid contents of the cell
(2)wall pressure or inward pressure:- Which is exerted on
by the stretched cell wall on the cell contents. In this
way a state of equilibrium id maintained between these
Importance of Turgidity:-It is responsible for different
kinds of movement of plant organs.
(1)It is helpful in ell to cell. Osmosis in plants.
(2)Turgidity gives rigidity to the growing regions. And also
to soft parts of the plants.
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