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P530/3
BIOLOGY PRACTICAL
Paper 3
July/August 2022
3¼ hours
WESTERN JOINT MOCK EXAMINATIONS
Uganda Advanced Certificate of Education
BIOLOGY PRACTICAL
Paper 3
3 Hours 15 Minutes
INSTRUCTIONS TO CANDIDATES:
This paper consists of three questions.
Answer all the questions.
Write the answers in the spaces provided.
No additional sheets of paper should be inserted in this paper.
You are not allowed to start working with the apparatus for the first 15 minutes. You are
advised to use this time to read through the paper and ensure that you have all the apparatus,
chemicals and specimens you may require.
For Examiners’ Use Only
Question Marks
1
Total
©2022 Western Joint Mock Examinations
1. You are provided with specimen W which is freshly killed.
(a) Examine the specimen, and by giving one reason based on the limbs, state its habitat.
(b) Place the specimen ventral side uppermost with the head towards you. Using forceps pull
the lower jaw upwards so as to separate it from the upper jaw. Examine the structures
exposed on the jaws. Draw and label the structures on the upper jaw responsible for the
specimen’s feeding.
(c) Dissect the specimen to display the blood vessels;
(i) Draining the structures from the structures on the left half of the trunk region
responsible for food storage, reproduction and oxygenation of blood.
(ii) Supplying the right side of the head and chest.
With the heart undisplaced, draw and label your dissection.
2
2. You are provided with specimen B and solutions V and x .
(a) Peel the specimen and obtain from it three cubes, each measuring 1 cm x 1 cm x 1 cm.
Obtain the same size of tissue from the liver, lung and thigh of the specimen in Question 1.
Obtain six test tubes and label them as 1, 2, 3, 4, 5 and 6.
Carry out the following tests as shown in Table 1 and in each case record your
observations and deductions.
Table 1
Test tube Contents Observations Deductions
1 2 cm3 of V add tissue
from Liver
2 2 cm3 of V add tissue
from Lung
3 2 cm3 of V add tissue
from thigh muscle
4 2 cm3 of V add one
cube of B followed by
5 drops of solution x
5 2 cm3 of V add one
boiled cube of B (after
cooling)
6 2 cm3 of V add one
pounded cube of B.
(b) Explain your results for the following test tubes.
Test tube 1
Test tube 2
Test tube 3
3
Test tube 4
Test tube 5
Test tube 6
(c) Suggest one conclusion that can be drawn from your results.
(d) From the tests above, state two factors being investigated.
(e) Suggest the
(i) nature of the active substance.
(ii) active substance in this experiment.
Give two reasons for your answer in (e)(ii).
3. You are provided with specimens C1, C2, C3 and C4.
(a) Obtain a few units of C2 and a few filaments of specimens C3 and mount them in a drop of
water on separate microscope slides.
(i) Observe each slide and state how each specimen is structurally adapted for nutrition.
Specimen C2
Specimen C3
4
(ii) By giving one reason, state the type of nutrition for specimen C2.
(iii) Describe the structure of specimen C3.
(b) With regard to nutrition and propagation, state two ecological
(i) advantages of specimen C3 over C2.
(ii) disadvantages of C2 over C3.
(c) Explain how specimen C1 is structurally adapted to its habitat.
(d) Using a hand lens, examine specimen C1.
(i) Draw and label the structures that increase the chances of propagation of the
specimen.
(ii) Explain how the structures labelled above achieve the role mentioned in (d)(i) above.
5
(e) (i) Examine specimen C4 and state its class and phylum.
Class
Phylum
(ii) Give three descriptive features of specimen C4 which qualify it to be in the class stated
in (i).
6 END
