The leaves of deciduous plants are broad, flat and designed to facilitate
photosynthesis. we know that plants need carbon dioxide and water in the
presence of light for photosynthesis to occur. we also know that plants take in
water through there roots and that water travels through xylem to reach the
leaves. these broad, flat leaves also facilitate transpiration, the loss of water through leaves. when subjected to a dry, hot environment, plants attempt to maintain homeostasis by