WAEC Biology questions: Respiration

25 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Respiration· WAEC

   During exhalation, the intercostal muscles

   • Acontract and lift the ribs
   • Brelax and the rib cage moves down and in
   • Cremain contracted
   • Dpull the diaphragm down

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   Explanation and discussion

2. Question 22· Respiration· WAEC

   The tiny air sacs in the lungs where gases are exchanged are the

   • Abronchi
   • Balveoli
   • Ctrachea
   • Dbronchioles

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   Explanation and discussion

3. Question 23· Respiration· WAEC

   In insects, air enters the body through

   • Aspiracles
   • Bgills
   • Clungs
   • Dstomata

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4. Question 24· Respiration· WAEC

   Lime water in a flask with germinating beans turns milky. This shows that the beans give out

   • Aheat
   • Boxygen
   • Cwater vapour
   • Dcarbon(IV) oxide

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   Explanation and discussion

5. Question 25· Respiration· WAEC

   In man, breathing in is brought about by the

   • Aclosing of the epiglottis
   • Brelaxation of the diaphragm
   • Ccontraction of the diaphragm and external intercostal muscles
   • Dcontraction of the stomach

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   Explanation and discussion