From which part of the plant $Erythroxylum$ $coca$ is cocaine obtained?

It interferes with the transport of the neurotransmitter dopamine.

Nayan's friend is consuming drugs. What should Nayan do?
$(i)$ Discuss with the friend's parents. $(ii)$ Bring the matter to the attention of the friend's teacher. $(iii)$ Advise him to stay away from alcohol and drugs. $(iv)$ Try to understand why he is consuming drugs and show empathy. $(v)$ Inform him about the physical harm caused by addiction. $(vi)$ Provide proper guidance and help him stay away from addiction.

Read the following statements:
$a.$ Heroin,commonly called smack,is obtained by acetylation of morphine.
$b.$ Cocaine is obtained from the latex of Papaver somniferum.
$c.$ Dopamine is an excitatory neurotransmitter.
$d.$ Morphine is an effective sedative and painkiller.
Mark the option which includes both correct statements.

What is obtained from the plant Erythroxylum coca,and what are its effects on the human body?

Morphine is known to: $(i)$ Induce a feeling of euphoria. $(ii)$ Relieve anxiety,fear,and tension. $(iii)$ Suppress appetite. $(iv)$ Act on neurons in the central nervous system to relieve pain and induce sedation. $(v)$ Stimulate urine production. Which of the following statements are correct?