MCQ
Cancer can be caused by the use of
- ✓Tobacco
- BAlcohol
- COpium
- D$LSD$
(a) Benzpyrene present in tobacco smoke is carcinogenic. About $95\%$ victims of lung cancer are due to smoking. Revers smoking cause oral cancer. Bidi smoking cause cancer of tongue, Pharynx, larynx, tonsils and esophagus. Tobacco chewing leads to oral cancer.
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($i$) It consists of a network of trachea, that open through $12$ pairs of small holes called spiracles present on the lateral side of the body.
($ii$) Thin branching tubes carry oxygen from the air to all the parts.
($iii$) The opening of the spiracles is regulated by sphincters.
($iv$) Exchange of gases take place at the tracheoles by diffusion.