Dissect specimen V to expose the digestive system. (a) Draw and label six parts of the digestive system. (b) Identify the organ for: (i) Carrying food from mouth to stomach (ii) Enzyme ptyalin production (iii) Bile secretion (c) Does the specimen have a gall bladder? Explain.

1. Draw and label six parts of the digestive system. (12 mk)
2. Identify the organ for: (i) Carrying food from mouth to stomach (ii) Enzyme ptyalin production (iii) Bile secretion (6 mk)
3. Does the specimen have a gall bladder? Explain. (2 mk)

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You are provided with specimen W. Follow these procedures: (a) Cut W in half and grind one part (test tube A), keep the other intact (test tube B). (b) Add 2 ml hydrogen peroxide to both. Observe reactions and test the gas using a glowing splint. Questions: (i) What is the aim of the experiment? (ii) Which test tube is the control? (iii) Explain observations in both tubes. (iv) Name the enzyme responsible and write the chemical equation. (v) Identify the gas evolved and draw two conclusions.

1. What is the aim of the experiment? (1 mk)
2. Which test tube is the control? (1 mk)
3. Explain observations in both tubes. (3 mk)
4. Name the enzyme responsible and write the chemical equation. (2 mk)
5. Identify the gas evolved and draw two conclusions. (3 mk)

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Observe specimens E, F, G, H and I. (a) List five shared features between specimens E and F. (b) Give four industrial uses of specimen H. (c) (i) What structures are visible on lower side of I? (ii) State their function. (d) List three features used to classify specimens E, F, and G into same phylum.

1. List five shared features between specimens E and F. (5 mk)
2. Give four industrial uses of specimen H. (4 mk)
3. (i) What structures are visible on lower side of I? (ii) State their function. (3 mk)
4. List three features used to classify specimens E, F, and G into same phylum. (3 mk)

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