A method of disposing of this resource can be quantified with the equation “Fm minus Fm prime, all over Fm prime.” Organisms that thrive in the absence of this resource are termed sciophilous (“sigh-OFF-uh-luss”). Organisms may exhibit etiolation (“EE-tee-oh-LAY-shun”) in the absence (10[1])of this (10[1])resource (10[1])as part of an “avoidance response” triggered in situations when they cannot act as tolerators. The ability to adapt between excess and insufficient (10[1])amounts of this resource depends on the speed at which NPQ can be activated or suppressed. (10[1])Organisms often grow into pentaprismic symmetry to maximize access to this resource (10[2]-5[1])in (10[1])a pattern (10[1]-5[1])known (10[1])as phyllotaxis (10[3]-5[1])(“FILL-oh-TAX-iss”). This (10[1])resource (10[2])becomes gradually less available when traversing (10[1])the emergent, canopy, (10[2])understory, and forest (10[1])floor layers of a rainforest. (10[1])For 10 points, name this resource that plants actively grow toward in phototropism. ■END■ (10[3])