Tobacco contains ........... which raise blood pressure and increase heart rate.

Assertion $A$: Nicotine increases blood pressure and heart rate.
Reason $R$: Nicotine stimulates the adrenal gland.
Which option is correct for Assertion $A$ and Reason $R$?

Which of the following depresses brain activity and produces feelings of calmness,relaxation,and drowsiness?

Identify the scientific name of the poppy plant.

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

Identify the narcotic substances obtained from the plants shown below.