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:
- What are sepals?
- After chewing where does food go?
- What happens if sufficient oxygen is not present?
- What happens if excess juice is secreted in stomach?
- What is osmosis?
- What are cross walls?