Class VI

What is the per centage of inhaled carbon dioxide by lungs?
  1. 21
  2. 0.04
  3. 4.4
  4. 2
in earthworm, the exchange of gases occurs through _ . 
  1. Lungs 
  2. Gills 
  3. Moist skin 
  4. Tracheae 
Giving out air rich in CO2 is called
  1. Inhalation
  2. Respiration
  3. Breathing
  4. Exhalation
Which is the most common substrate of respiration?
  1. Alcohol
  2. Carbon dioxide
  3. Glucose
  4. Lactic acid
Break down of food releases ____.
  1. Energy
  2. Proteins
  3. Carbon-dioxide
  4. None of these
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