Question

(a) Fig. 1.1 is a diagram of the alimentary canal and associated organs.

(i) State the letter in Fig. 1.1 that identifies where:
most absorption occurs …………………………………..
egestion occurs …………………………………..
ingestion occurs …………………………………..
saliva is produced. …………………………………..
(ii) State the names of the parts labelled D and H in Fig. 1.1.
D …………………………………………………………………………
H …………………………………………………………………………
(iii) Complete the sentence to define the term digestion.
Digestion is the ………………………………………… of large, insoluble food molecules into small, water-soluble molecules using mechanical and ………………………………………… processes.

(b) The boxes on the left show some nutrients.
The boxes on the right show some principal sources of nutrients.
Draw one straight line from each nutrient to its principal source.
nutrient principal source

(c) Describe the dietary importance of iron.