- You are provided with olive oil, liquids labeled L, and L2, and an Irish potato. Label test tubes A and B. Place 2cm of water into each test tube. Add 8 drops of olive oil into each test tube. To test tube A, add 8 drops of liquid L. Shake both test tubes. Allow to stand for 2 minutes.
- Record your observations made in the test tubes A and test tube B Test Tube A (1mark)
- Name the process that has taken place in test tube A (1 mark)
- State the significance of the process named in (a) above (1 mark)
- Name the digestive juice in humans that has the same effect on oil as liquid L (1 mark)
- Name the region of the alimentary canal into which the juice is secrete (1 mark)
- Label two test tubes C and D place 2cm of liquid L2 into each test tube. Add a drop of iodine solution into each test tube. Record your observations. (1 mark)
- Suggest the identity of L2 (1 mark)
- Cut a cube whose sides are 1 cm from the Irish potato. Crush the cube to obtain a paste. Place the paste into a test tube labeled C. add 2cm3 of amylase solution. Leave the set up for at least 30 minutes.
Record your observations (1mark)
- Account for the result in (b)(iii) above (2marks)
- Cut another cube whose sides are 1 cm from the Irish potato. Crush the cube. Place the crushed paste into a test tube. Carry out food test with reagents provided. Record your procedure and results.
- Study the photographs shown below then answer the questions that follow.
- State the type of evolution represented by structures Q1, R1, and S1. (1mark)
- Explain the type of evolution identified in (a) above (1 mark)
- Q1, R1 and S1:
- A1, B1, and C1: (1mark)
- What type of evolution is illustrated by the limbs (A1, B1 and C1) (1mark).
- Name the class for each Q, R and S. (3marks)
- Give one observable reasons for your answer for class S (1mark)
- Suggest the diets of animals B and R (2marks)
- How is beak of animal B adapted to its function (1 mark)
- Study the specimens provided then answer the questions below
- Name the parts labeled A1, B1, C1 and C3 (4marks)
- Fill in the table below with appropriate agent of dispersal and give a reason. (2mark)
specimen agent of dispersal reason A
- How does part C2 adapt Specimen C to its agent of dispersal? (1 mark)
- Explain why Specimen A is important in a child's diet. (1mark)
- The diagram below represents two mature parasitic worms, labelled A and B, of the species Schistosoma mansoni that causes bilharzia
- With a reason, identify the male and the female worm in the diagram above. (3marks)
- Name two hosts, primary and intermediate, for these parasitic worms. (2marks)
- State one way of controlling the spread of bilharzia (1marks)