Which one of the following is a hallucinogenic drug?

Assertion: $LSD$ and marijuana are clinically used as analgesics.
Reason: Both these drugs suppress brain function.

What is the main cause of concern for today's youth?

Match the following correctly:

$(i)$ Opium poppy	$(p)$ Caffeine
$(ii)$ Cannabis indica	$(q)$ $LSD$
$(iii)$ Ergot fungus	$(r)$ Ganja
$(iv)$ Erythroxylum	$(s)$ Opium

......... are known as stimulants and ......... are known as sedatives.

Nicotine is an alkaloid that enters the body through smoking. How many of the following characteristics are associated with its effects?
$(i)$ Increases blood pressure
(ii) Decreases respiratory rate
(iii) Causes cancer of the lungs,throat,and bladder
(iv) Induces allergies
$(v)$ Can cause emphysema
(vi) Decreases the level of $O_2$ in the blood