Name………………………………………………………. ADM No………..
Class…………
Candidates Signature…………… Date…………………………….
SCHOOL……………………………………
231/3
Biology
Paper 3
(Practical)
March 2024
13/4 Hours.
MATETE SUB-COUNTY EXAMINATION 2024
KENYA CERTIFICATE OF SECONDARY EDUCATION (K.C.S.E)
Instructions to candidates.
a) Write your official name, index number, school name and admission number in the spaces
provided above.
b) Sign and write date of examination in the spaces provided above.
c) Answer all questions in the spaces provided.
d) You are required to spend the first 15 minutes of the13/4 hours allowed for this paper
reading the whole paper carefully before commencing your work.
e) Candidates should check the question paper ascertain that all the pages are printed as
indicated and that no questions are MISSING.
For Examiner’s Use Only
Questions Maximum Score Candidate’s Score
1 13
2 13
3 14
Total Score 40
1|Page
1. The specimen labelled E and photograph labelled F shows an organ from a given group of
organism.
a) With two reasons, name the organ represented by E and F. (3mks)
Organ
reasons
b) Using observable features in specimen E and photograph F.
i) Place with two reasons, the organisms from which E and F were obtained in their
correct
Division. (3mks)
Division
Reasons
ii) State two features of the organism from which E and F were obtained that make
them be placed in different classes.(2mks)
E F
2|Page
Describe specimen E under the following features. (2mks )
Texture
Margin
c) Apart from storage site, state three functions of E and F to a plant. (3mks)
2. You are provided with specimen L together with photographs of Slug, grasshopper, snake, lizard,
blackbird and hawk.
3|Page
Assume the organisms are found in the same ecosystem.
a) i) Construct a complete food web that includes the specimen and photographs of organisms in
this ecosystem. (8mks)
ii) Write two food chains ending with tertiary consumer. (2mks)
4|Page
iii) Identify an organism with highest number of prey. (1mk)
b) i) Name the producer. (1mk)
ii) Give a reason for your answer in b(i). (1mk)
3. You are provided with specimen W and the following reagents
- Dilute Hydrochloric aid
- Dilute hydrogen peroxide
- Dilute sodium hydroxide
- Three test tubes
- 2-10ml measuring cylinder
- Scalpel
- 3 labels
Procedure
i) Label the test tubes A, B and C.
ii) Using a scalpel obtain three cubes of 1cm×1cm×1cm from specimen W and reserve the rest.
iii) Using scalpel separately chop the first and second cubes into tiny pieces. Place into test
tube A and B respectively.
iv) Place the remaining cube in test tube C as a whole.
v) In test tube A add 2cm3 of dilute hydrochloric acid. In each of the test tube B and C add
2cm3 dilute sodium hydroxide.
5|Page
vi) In test tube A,B and C add into each 4cm3 of hydrogen peroxide.
a) i) Observe the amount of effervescence produced in each test tubes and complete the table
below. (6mks)
Test tube Content Amount of effervescence
A
ii) Explain the observation made in test tube A. (1mk)
iii) From the experiment above, state two factors that were under investigation. (2mks)
b) What would be the expected result if W was first boiled before being used in the experiment.
Explain. (2mks)
6|Page
c) i) Write a word equation that leads to production of effervescence in a(i) above. (1mk)
ii) Give a term that refers to homeostatic function demonstrated in the experiment above. (1mk)
iii) Name part of human body where the function stated in c(ii) above takes place. (1mk)
7|Page
8|Page
