In c3 plants the conservation of water promotes in c3 plants the conservation of water promotes

In C3 plants the conservation of water promotes photorespiration.
Other names or terms used for Photorespiration are oxidative photosynthetic carbon cycle, or C2 photosynthesis.
We can define photorespiration as a process in plant metabolism in which the enzyme RuBisCO oxygenates RuBP and as a result some of the energy produced by photosynthesis to be wasted.

Answer;

Stimulation of thoracic or lumbar spinal regions; impulse reaches chain ganglion; acetylcholine release

Explanation;The sympathetic nervous system is part of the autonomic nervous system, which also includes the parasympathetic nervous system.The sympathetic nervous system  functions by activating the fight or flight responses. It operates through a series of interconnected neurons. Sympathetic neurons of the spinal cord communicate with the PNS via a series of sympathetic ganglia. Spinal cord sympathetic neurons joins with the peripheral sympathetic neurons through the chemical synapses.At synapses, preganglionic sympathetic neurons release acetylcholine, which binds and activates nicotinic acetylcholine receptors on the postganglionic neurons.