Class XI

The solubility of carbon dioxide is
  1. 20 – 25 times higher than that of oxygen
  2. 20 – 25 times lower than that of oxygen
  3. 10 – 15 times lower than that of oxygen
  4. 10 – 15 times higher than that of oxygen
Pharynx is the common passage for food and air but still food do not enter into the windpipe due to the presence of
  1. Frenulum
  2. Epiglottis
  3. valve of windpipe
  4. Glottis
Insect of family chironomidae eg..chironomous larvae are also known as bloodworms since :
  1. they are blood parasites
  2. They have only blood
  3. they contain haemocyanin as their respiratory pigment
  4. they contain haemoglobin as their respiratory pigment
Which part of our respiratory system doesn’t need ciliated epithelium and thus have non-ciliated walls ?
  1. trachea
  2. alveoli
  3. nasal chamber
  4. bronchioles
Skin is the only respiratory organ in :
  1. larvae of mosquitoes
  2. Peripatus
  3. Hirudinaria granulosa
  4. Ranatigrina
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