Topic: Food Energy and Respiration Subtopic: Making the air moist, warm and clean
Why we should not breathe through mouth?
Answer: Mouth does not contain mucus, blood vessels near the surface or hair that could trap the dust particles or germs.
- What are products of respiration?
- What are raw products used by plants?
- Why are Villi essential?
- What is flower?
- From where does roots take up oxygen?
- Why is iron important?