MEDIUM
Lower Secondary Stage 8
IMPORTANT
Earn 100

A student breathes in and out 7 times in 30 seconds. Calculate the breathing rate. 

Important Questions on Respiration and Circulation

MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 2 - Respiration and Circulation>End of chapter review>Q 17
Draw a labelled diagram to explain how specialised cells in the tubes of your lungs to keep them clean.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 2 - Respiration and Circulation>End of chapter review>Q 17
Explain what happens if the specialised cells in the tubes of our respiratory system stop working. 
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 2 - Respiration and Circulation>End of chapter review>Q 18
Carbon monoxide is a poisonous gas. It sticks to haemoglobin. This stops other substances from sticking to haemoglobin. One of the early symptoms of carbon monoxide poisoning is an increase in breathing rate. Explain this symptom. 
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 2 - Respiration and Circulation>End of chapter review>Q 20
An increase in temperature increases the speed of diffusion. Explain why plants are more likely to wilt in very hot weather.