In a ring girdled plant (a) the shoot and root die together (b) neither root nor shoot will die (c) the shoot dies first (d) the root dies first.
The water potential of pure water is (a) less than zero (b) more than zero but less than one (c) more than one (d) zero.
Root pressure develops due to (a) passive absorption (b) active absorption (c) increase in transpiration (d) low osmotic potential in soil.
Select the incorrect statement. (1) Elements most easily mobilized in plants from one region to another are : phosphorus, sulphur, nitrogen and potassium (2) Transport of molecules in phloem can be bidirectional (3) Movement of minerals in xylem is ...