What factors regulate the opening and closing of guard cells?

The guard cell synthesize glucose through photosynthesis in the presence of light. As glucose accumulates, osmotic pressure increases and this enables them to draw water from adjacent epidermal cells by osmosis. hope this helps

the answer is :

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.