AP BIOLOGY

Detailed explanation-1: -Yes. b. Plant hormones sometimes travel in vessels but more often reach their targets by moving through cells or by diffusing through the air as a gas. Explain why G protein-regulated pathways shut down rapidly in the absence of a signal molecule.

Detailed explanation-2: -In animals, cell-to-cell communication is facilitated by both hormones and the neuronal systems. Plants lack neuronal systems and rely largely on hormones and secreted small peptides for communication.

Detailed explanation-3: -Plant cells communicate with each other via narrow channels embedded across adjacent cell walls. These channels, called plasmodesmata, allow molecules to pass between cells, thereby enabling plants to grow normally and develop tissues and organs.

Detailed explanation-4: -In plants, as in animals, cells are in constant communication with one another. Plant cells communicate to coordinate their activities in response to the changing conditions of light, dark, and temperature that guide the plant’s cycle of growth, flowering, and fruiting.

Detailed explanation-5: -Hormones mediate changes in target cells by binding to specific hormone receptors. In this way, even though hormones circulate throughout the body and come into contact with many different cell types, they only affect cells that possess the necessary receptors.