Water plus minerals c. Water plus enzymes d. All of these . Stomata of a plant open due to (CBSE ) a.
Influx of potassium ions b. Efflux of potassium ions c. Influx of hydrogen ions d. Influx of calcium ions .
Potometer works on the principle of (CBSE ) a. Osmotic pressure b. Amount of water absorbed equals the amount transpired c. Potential difference between the tip of the tube and then of the plant d.
Root pressure . Most suitable theory for ascent of sap is (CBSE , CPMT-UP ) a. Transpirational pull and cohesion theory of Dixon and Jolly b. Pulsation theory of J.C.
Bose c. Relay pump theory of Godlewski d. None of these . If a cell kept in a solution of unknown concentration gets deplasmolysed, the solution is, (CPMT-UP ) a.
Detonic b. Hypertonic c. Isotonic d. Hypotonic .
Which is essential for the growth of root tip ? (NEET PHASE II ) a. Zn b. Fe c.
Ca d. Mn . On the basis of symptoms of chlorosis in leaves, a student inferred that this was due to deficiency of nitrogen. The inference could be correct only if we assume that yellowing of leaves appeared first in (AIIMS ) a.
old leaves b. young leaves c. pushing it upward d. pushing and pulling it, respectively .
Movement of ions or molecules in a direction opposite to that of prevailing electro-chemical gradient is known as (C.B.S.E. ) a. Active transport b. Pinocytosis c.
Brownian movement d. Diffusion . Correct sequence of events in wilting? (P.M.T.
Kerala ) a. Exosmosis-deplasmolysis-temporary and permanent wilting b. Exosmosis-plasmolysis-temporary and permanent wilting c. Endosmosis-plasmolysis-temporary and permanent wilting d.
Endosmosis-deplasmolysis - temporary and permanent wilting e. Exosmosis-deplasmolysis-plasmolysis - temporary and permanent wilting . What will be the direction of net osmotic movement of water if a solution 'A', enclosed in a semi permeable membrane, having an osmotic potential of'- ' bars and turgor pressure of ' ' bars is submerged in a solution 'B' with an osmotic potential of '- ' bars and ' ' turgor pressure ? (C.E.T.