Drugs And Alcohol Abuse

Heroin, commonly called smack, is chemically diacetylmorphine and is obtained by the acetylation of morphine, which is itself extracted from the latex of the opium poppy, Papaver somniferum. Morphine and its derivative heroin are opioids that bind to specific receptors in the central nervous system and act as depressants, slowing down body functions, which is why they are powerfully sedative and addictive. Erythroxylum coca is incorrect because it produces cocaine, a stimulant, not the opioid depressant described in the question. Cannabis sativa is wrong because it provides cannabinoids like marijuana and hashish that act on the cardiovascular system rather than yielding morphine. Datura stramonium is incorrect since it contains tropane alkaloids and is not the recognised source of morphine or heroin in this context. As stated in NCERT Class 12, Chapter 8 (Human Health and Disease), opioids obtained from the latex of Papaver somniferum bind to specific opioid receptors present in the central nervous system and the gastrointestinal tract and depress nervous activity, which explains their strong sedative and addictive nature. As a logical check, only the opium poppy among the listed plants yields morphine that can be chemically acetylated into heroin, so Papaver somniferum is unambiguously the correct plant source.