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CIE iGCSE Co-Ordinated Science B7.2 Digestive system Exam Style Questions Paper 2

CIE iGCSE Co-Ordinated Science Paper 2 - All Chapters

Question

Which organ produces an alkaline mixture that neutralises gastric juices?

A. salivary glands
B. large intestine
C. liver
D. stomach

▶️ Answer/Explanation
The liver produces bile, which is alkaline and is stored in the gall bladder. Bile neutralises the acidic gastric juice entering the duodenum and provides a suitable pH for enzyme action. Salivary glands produce saliva, large intestine absorbs water, and stomach produces acid.
✅ Answer: (C)

Question

The diagram shows part of the human digestive system.

Which organs produce digestive enzymes?

A. P and Q
B. Q and R
C. R and S
D. S and P

▶️ Answer/Explanation
In the diagram, P is the liver (produces bile but not digestive enzymes), Q is the pancreas (produces amylase, protease and lipase), R is the small intestine (produces intestinal enzymes) and S is the stomach (produces protease). Therefore, the organs that produce digestive enzymes are Q (pancreas) and R (small intestine).
✅ Answer: (B)

Question

Which row provides the greatest amount of the nutrient needed to move food through the alimentary canal?

▶️ Answer/Explanation
Fibre (roughage) is the nutrient that helps move food through the alimentary canal by aiding peristalsis.
Row C has the highest fibre content (10.9 g per 100 g) compared to the other rows.
✅ Answer: (C)

Question

Some processes that occur in the alimentary canal and associated organs are listed.

  1. absorption
  2. assimilation
  3. digestion
  4. egestion
  5. ingestion

Which diagram correctly links each process to the part of the alimentary canal or associated organs?

▶️ Answer/Explanation
The correct sequence along the gut is \(\text{ingestion} \rightarrow \text{digestion} \rightarrow \text{absorption} \rightarrow \text{assimilation} \rightarrow \text{egestion}\).
Diagram D places processes \(5, 2, 1, 3, 4\) at the mouth, stomach/intestine, small intestine, liver/cells, and anus respectively, matching this correct anatomical order.
✅ Answer: (D)

Question

Dogs are mammals and have the same types of teeth as humans.

Which tooth is a canine?

▶️ Answer/Explanation
Canine teeth are pointed and cone-shaped, used mainly for gripping and tearing food, unlike the flat-edged incisors or the ridged, flatter premolars and molars.
Of the four shapes shown, the tooth with a single sharp, pointed cusp and no flat biting or grinding surface matches this description.
This distinctive pointed shape identifies option D as the canine.
✅ Answer: (D)
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