There will be a passive transport or usage of energy
To survive, desert plants have adapted to the extremes of heat and aridity by using both physical and behavioral mechanisms, much like desert animals. Plants that have adapted by altering their physical structure are called xerophytes. Xerophytes, such as cacti, usually have special means of storing and conserving water. They often have few or no leaves, which reduces transpiration.
(A) the active site is the part of the enzyme into which the substrate fits.So Active Site is the answer to your question.
