Answer for question number 1 :
NICOTINE
Sources : Nicotine is predominantly found in tobacco plants such as Nicotiana rustica as well as Nicotiana tabacum which belongs to solanaceae family.
Mode of Action : Nicotine is an alkaloid which acts as agonists for acetylcholine receptors and acts simillarly like a neurotransmitter. (Agonists are structural analogs that bind to a receptor and mimic the effects of its natural ligand).
CAFFEINE : Caffeine is known to stimulate central nervous system. Caffeine is found in many plants. some are listed below
Sources :
In coffee beans : Coffea arabica and in coffea canephora.
It is alos found in Coco plant such as Theobroma cacao
Mode of Action : Caffeine acts as an antogonist of adenosine receptors in the brain. (Antagonists are analogs that bind without triggering the normal effect and thereby block the effects of agonists). Caffeine acts as an antogonist since its structure is similar to adenosine.
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