Stomatal opening requires each of the following conditions, except  

A.  expenditure of energy.
B.  a reduction of turgor in the guard cells.
C.  water entering the guard cells by osmosis.
D.  a lower water potential in the guard cells.
E.  pumping of potassium ions into the guard cells.


B.  a reduction of turgor in the guard cells.

When guard cells absorb water and become turgid, the stomata are opened. When guard cells lose water and turgidity, the cells cover the stomatal opening which blocks transpiration.

Biology & Microbiology

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their expression. Indicate whether the statement is true or false.

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Nondisjunction results in 

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