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KCSE CLUSTER TESTS 27

Biology Paper 3

1.

You are provided with the following; specimen K, specimen X, scalpel blade, pair of forceps, Iodine solution and Benedict’s solution.

a) What type of fruit is K?

___________________________________________________________________________ ___________________________________________________________________________

b) With a reason, identify the agent of dispersal for specimen

Agent ___________________________________________________________________________ ___________________________________________________________________________

Reason ___________________________________________________________________________

___________________________________________________________________________

c) On specimen X, carry out food tests using the re agents provided. Record your procedures, observations and conclusions in the table below.

d) Cut the specimen 1.0cm from the tip as well as shown in the diagram into two parts:

Place both pieces on the petridish with the 6cm3 of specimen X so that the cut surface is in contact with the substance. Allow the pieces to remain there for 30minutes. After 30minutes carefully remove the pieces. Put the solution into two test tubes. Use the reagents provided to carry out food tests.
Record your observations
___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________

e) Account for the observation in (c) and (d) above. ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________

f) What is the significance of the process being investigated ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________

14 marks

2.

In an ecological study carried out by form 3 students, they designed an experiment as shown below. The jar in which the materials are assembled was airtight; containing seawater, algae, small crustaceans, saprophytic bacteria, X and Y. the set up was kept in the open sun and studied for 5months.

Study this illustration carefully and answer the questions that follow.

a) What was the aim of the study ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________

b) What was the possible observation the students made after 5 months ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________

c) Account for your answer in (b) above

d) Identify X and Y in the jar X.__________________________________________________________________________ Y.__________________________________________________________________________
e) What would happen if?
i) X was removed from the jar
___________________________________________________________________________ ___________________________________________________________________________
ii) The set up was put in the dark
___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________

14 marks

3.

i) The diagram below shows the bones and two of the muscles in the human arm

12 marks

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