Category: Biology

Passive water absorption This theory explains that the forces responsible for absorption of water into the roots are governed by other cells.  In actively transpiring plants absorption of water …

Diffusion: Plant-water relations Diffusion is the movement of gas, liquid and solute molecules or ions from their region of higher concentration to the region of their lower concentration. The …

Osmosis Osmosis is the movement of solvent from a region of its higher concentration to a region of its lower concentration when the two are separated by a semipermeable …

Imbibition : Plant-Water Relations Imbibition is the absorption of water by the solid particles of an adsorbant without forming a solution . The particles which absorb water are the …

 Plasmolysis Plasmolysis is the shrinkage of the protoplast of a cell from its cell wall under the influence of a hypertonic solution. If a plant is placed in highly …

 Role of k+ in stomatal movement: Imamura and M. Fujino (1959) found a direct correlation between stomatal movement and K+ ion concentration of guard cells. Fujino proposed that stomatal …

Mechanism of opening and closing of stomata  Stomatal transpiration occurs when stomata are fully open.  The opening and closing of stomata is a direct response to increase or decrease …

Transpiration  Transpiration is the process of loss of water in the form of vapours from the aerial portions of the  plant.  Less than 5% of total water absorbed by …

Ascent of sap Ascent of sap is the upper movement of sap through stem . In other words, the process of translocation of sap from the roots to the …

Ascent of Sap:Physical theories According to the proponents of physical theories of ascent of sap living cells do not take part in the translocation of water. Rather it is …