The melon cactus (Melocactus) is a desert succulent adapted to extremely arid environments. Unlike temperate deciduous plants which have thin, flattened leaves, the melon cactus has a globular (spherical) stem and no true leaves.
Which statement correctly explains how the spherical shape of the cactus stem adapts it to its dry environment?
A spherical shape maximizes the surface-area-to-volume ratio (SA:VSA:VSA:V), allowing the plant to rapidly absorb dew and humidity from the dry desert atmosphere.
A spherical shape minimizes the surface-area-to-volume ratio (SA:VSA:VSA:V), which minimizes the rate of transpirational water loss per unit volume of stored water.
A spherical shape increases the surface-area-to-volume ratio (SA:VSA:VSA:V) of the photosynthetically active outer layer, thereby accelerating carbon dioxide fixation.
A spherical shape minimizes the volume of the plant while maximizing its total surface area, facilitating rapid heat dissipation through convection.