Ans. A. pines
Exp.Turpentine (also called spirit of turpentine, oil of turpentine, wood turpentine and colloquially turps) is a fluid obtained by the distillation of resin from live trees, mainly pines. It is mainly used as a solvent and as a source of materials for organic synthesis.
Q2. The metal ion involved in Stomatal regulations is
Exp. Each stomata has two dumb-bell or kidney shaped cells (depending on the plant type) called guard cells surrounded by a few specialised epidermal cells called subsidiary cells. The opening and closing of stomatal aperture is regulated by turgidity of guard cells which is brought about by entry/exit of K+ ions.