What are consequences of the following conditions? (a) A cell having higher water concentration than the surrounding medium. (b) A cell containing low water concentration than the surround medium. (c) A cell having equal water concentration to its surrounding medium.

High water concentration occurs in hypotonic solution, low water concentration in hypertonic solution while equal water concentration in isotonic solution.
(a) A cell having higher water content or hypotonic cell sap will undergo exosmosis and, therefore, lose water. It may undergo plasmolysis.
(b) A cell having low water concentration or hypertonic cell sap will undergo endosmosis and absorb water from outside. It would become turgid.
(c) A cell having isotonic cell sap will neither gain nor lose water to the external medium.