Question

2(a) In sequence, name the organs that constitute the alimentary canal of human
(b) State: (i) Three structural differences; (ii) Three structural similarities; between the alimentary canal of a bird and human
(c) Explain briefly how the dentition of herbivores is adapted for feeding
(d) State two roles of the pancreas in digestion

Accepted Answer

(a) Mouth → Oesophagus → Stomach → Duodenum → Ileum → Jejunum → Large intestine → Rectum

(b)(i) Structural differences between alimentary canal of bird and human:
Human has mouth while a bird has beak
Humans have appendix while birds lack it
Humans lack crop while birds have crop
Humans have teeth while birds lack teeth

(ii) Structural similarities:
Both humans and birds have stomach
Both have large intestine
Both have duodenum
Both have caecum
Both have rectum

(c) Herbivores possess incisors for cutting grasses; they have molar for grinding; their diastema helps in rolling grass.

(d) Roles of the pancreas in digestion:
  The enzyme lipase produced by pancreas converts fats and oil to fatty acid and glycerol
  The enzyme amylase acts on starch
  The enzyme trypsin acts on peptone
(Any two)

WAEC Biology 2016 Theory — Question 2

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