Q. Assertion : Tobacco contains a large number of alkaloids including nicotine.
Reason : Nicotine stimulates adrenal glands which decrease blood pressure and increase heart rate.

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Solution:

Tobacco contains a large number of chemical substances including nicotine, an alkaloid. Nicotine stimulates adrenal gland to release adrenaline and nor-adrenaline into blood, both of which raise blood pressure and increase heart rate.