Free MCQsLearn App Download - Topic: Food Energy and Respiration Subtopic: Diseases of the respiratory system
Which harmful chemical is black in color?
Answer: Tar is the chemical which has a blackish shade. It is one of the most harmful chemicals because it damages the respiratory more than any other chemical present in the cigarette.
Learn also:
- How is oxygen transported to cells?
- What are xylem and phloem?
- How does rate of transpiration vary?
- How are atria and ventricles separated?
- What are properties of blood present in veins?
- What are carbohydrates and functions?
