question_answer 42)

    The shape of guard cells changes due to change in the (a) protein composition of cells                                 (b) temperature of cells (c) amount of water in cells                                         (d) position of nucleus in the cells

Answer:

                  (c) The shape of guard cells changes due to amount of water in them. The guard cells well when water flows into them, causing the stomatal pore to open. Similarly, the forecloses if the guard cells shrink, due to the loss of water in then.