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Write the source and the effect on the human body of the following drugs :

(i) Morphine

(ii) Cocaine

(iii) Marijuana

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(i) Morphine- poppy plant/Papaver somniferum,depressant.

(ii) cocaine - Erythroxylum coca,stimulates causes euphoria/hallucination.

(iii) Marijuana- cannabis sative,affects cardiovascular system of the body.

Detailed 

(a) Morphine:

(i) source : Latex of unripe capsules of poppy plant (papaver somniferum)

(ii) Effect on human body : It has a sedative and analgesia and a calming effect. It is a depressant.it decreases blood pressure and depresses respiratory centre.

(b) Cocaine : 

(i) Source - Erythroxylum coca

(ii) Effect on the human body: It is a powerful stimulant of CNS. Its higher doses causes hallucination and euphoria.

(c) Marijuana :

(i) Source: Cannabis Sativa

(ii) Effect on human body : It is hallucinogenic, affects the cardiovascular system of the body and may even cause psychosis.

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