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553/1
BIOLOGY
(THEORY)
PAPER1
July/August 2010
2½ hours

Uganda Certificate of Education

JOINT MOCK EXAMINATIONS – 2010
BIOLOGY THEORY
Paper 1
2hours 30 minutes

INSTRUCTIONS TO CANDIDATES:

Answer all questions in sections A and B plus two questions in section C.

Answers to section A should be written in the boxes.
Answers to section B should be written in the spaces provided.

Answers to section C should be written on answer booklets provided.

For Examiner’s use

only
Section/ Marks
questions
A: 1 – 30
B: 31
32
33
C: 34
35
36
37
TOTAL
 Turn over
©2010 jmeb

SECTION A

1. The maize fruit is an example of

A. Schizocarp B. Berry C. Cayopsis D. Drupe

2. The chromosome number in the liver cells is 22, the number in the
gametes will be
A. 22 B. 44 C. 23 D. 11

3. Which of the following is not a plant organ?

A. Phloem vessel B. Tap root C. flower D. foliage leaf

4. A form of learning in which an unrelated or irrelevant stimulus

produces a response originally associated with an appropriate
stimulus is referred to as
A. Reflex action B. Synapse
C. Conditioned reflex D. Voluntary action

5. Which of the following pairs form the vascular bundles

A. Cambium and cortex B. Xylem vessel and cambium
C. Phloem and xylem D. Phloem and cortex

6. An organism has the following features

(i) long coiled poboscis
(ii) two pairs of scale wings
(iii) a pair of knobbed/ clubbed antennae
The organism belongs to order
A. Isoptera B. Orthoptera C. Lepidoptera D. Hymenoptera

7. A crocus flower opening its petal on a warm dry day is an example of

a
A. Nastic movement B. Tactic movement
C. Reflex action D. Tropic movement

8. Which of the following is an endocnne gland

A. Pancreas B. Salivary gland C. Gastric gland D. Sweat
gland

9. Colour blindness is caused by a recessive gene and is sex linked. It

occurs mainly in males. If a colour blind male marries a carrier
female, what will the percentage of colour blind daughters among the
children
A. 0 B. 25 C. 50 D. 75

10. Which of the following structures of amoeba is responsible for feeding

A. Food vacuole B. Contractile vacuole
C. Pseudopodia D. Cell membrane

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11. Which of the following sugars is not reducing
A. Maltose B. Fructose C. Galactose D. Sucrose

12. Which of the following nutrient are important in the formation of

chlorophyll
A. Potassium and sulphur B. Nitrogen and magnesium
C. Calcium and phosphorous D. Zinc and copper

13. The guard cells differ from epidermal cells in that it

A. Has a cell vacuole B. Has chloroplasts
C. Lacks a nucleus D. Has holes

14. Which of the parts below on a microscope controls the amount of

light entering it
A. Mirror B. eye piece C. condenser D. Diaphragm

15. S4 student carried out an experimental to determine the percentage

of water in the soil sample and the results are as below
Mass of crucible = 40g
Mass of soil = 80g
Mass of crucible plus soil after heating to red hot =90g
What was the percentage of water in the soil samples?
A. 50% B. 37.5% C. 44.4% D. 88.8%

16. After a period of study, a student observed that two organisms R and
M lived together in a loose relationship; M surviving on R while R was
not affected in any way by the presence or absence of M. The type of
relationship is termed as
A. Parasitism B. Symbiosis C. commensalism D. Saprophytism

17. The following is a dental formula of a certain animal

I I 22 C11 PM 22 M 33 . Which of the following is NOT true about the
animal
A. It feeds on vegetation alone
B. It is man
C. It feeds on both flesh and vegetation
D. Its dentition is described as heterodont

18. The figure1 below shows a certain stage of cell division

The stage of cell division in the above is

A. interphase B. telophase C. anaphase D. metaphase

19. Lymphocytes effect immunity by

A. engulfing foreign bodies
B. releasing antibodies
C. production of antigen
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 D. coagulation of foreign bodies

20. Global warming is a result of

A. Increased oxygen in the atmosphere
B. Increased carbondioxide in the atmosphere
C. Increased nitrogen in the atmosphere
D. the sun moving near the earth

21. The kind of joint occurring between the femur and tibia of a man is
A. Ball and socket B. Fixed joint
C. Umbilical cord D. Spinal cord

22. Which of the following attaches the foetus to the mothers uterus
A. placenta B. foetal membrane
C. umbilical cord D. Spinal cord

23. By what process does free nitrogen in the atmosphere convert to

nitrates directly
A. Nitrification B. Lightening C. Absorption D. Nitrogen
fixation

24. During anaerobic respiration in plant cells the break down of glucose
Produces
A. alcohol and water B. water carbondioxide
C. alcohol and carbonoxide D. carbondioxide and lactic acid

25. Which one of the following is formed from nitrogen compounds by the

liver?

A. Urine B. Nitrates C. Amino acids D. Urea

26. Which one of the following digestive juices does not contain

enzymes?

A. Bile juice B. Pancreatic juice C. Saliva D.

Intestinal juice.

27. In figure 2 below cell X belongs to

A. Cortex B. Pericycle C. Endodermis D. Piliferous layer

28. The best method of studying distribution of butterflies in a flower

garden is by using
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 A. quadrate
B. capture mark recapture method
C. line transect
D. direct counting

29. The figure 3 below shows energy flow though different feeding levels
in an ecosystem.

Producers primary consumers secondary consumers

tertiary

Consumer

From the above, which of the following is not correct

A. All consumers depend on primary producers for energy

B. Energy flow is in one direction
C. Producers depends on tertiary consumers for energy
D. During energy flow, there is eating and being eaten.

30. In which of the following tissue does mitosis occur

A. Cambium B. Pith C. Phloem D. Xylem

SECTION B: (answer all questions)

31. Science students in S4 carried out an experiment in the laboratory

and came up with the following results
Table of results:.
Substrate
Concentrati 50 100 200 300 - 500 - 635
on (mg)
Time in 30
seconds - 65 85 105 12.5 145 155

Rate of
reaction 17 2.2 - - 3.8 - - 41

(a) (i) Complete the table above. (3½mks)

(ii) Using the information in the table above, construct a graph to
show the
rate of reaction in relation to substrate concentrate.
(6½mks)

(b) (i) What is the relationship between the rate of reaction and
substrate
concentration shown in the graph?
(2mks)

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...............................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
....................................................

(ii) What is the effect of continued increased substrate

concentration on
enzyme activity?
...............................................................................................................
...............................................................................................................
...............................................................................................................
....................... (1mk)

(iii) Explain your results from the graph above in relation to

enzyme activity.
...............................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
................................................................
...............................................................................................................
...............................................................................................................
.............. (3mks)

(c) Using the graph state the rate of reaction of the following
substrate
concentrations:
(i)
150gm............................................................................................

(ii)
450gm...........................................................................................
(2mks)

(d) Apart from the factor being investigated above, mention any
other four
factors which affects enzyme activity.

(i) ............................................................................................
.........

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 (ii) ............................................................................................
........
(iii) ............................................................................................
........
(iv) ............................................................................................
.......
(2mks)

32. The figure 4 below shows an experimental set up to investigate the

presence of one of the soil components.

fresh soil heated soil

in muslin in muslin
bag bag

lime water

P Q

(a) (i) What soil component is being investigated?

..........................................................................................................
(1mk)

(ii) State the use of lime water in the experiment

...............................................................................................................
............................................................................................................
.(1mk)

(b) (i) State what will be observed in each of the set ups:
P...................................................................................................
.....................................................................................................
........................

Q...................................................................................................
.....................................................................................................
........................

(ii) What was the importance of heating the soil for 2hours in set
up Q?
.....................................................................................................
.....................................................................................................
.............. (1mk)

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 (c) State any 3 roles played by the soil component being investigated
in the
experiment in the soil.

(i)..................................................................................................
......... ....................................................................................
..........................

(ii).................................................................................................
......
.....................................................................................................
.....
(iii)................................................................................................
.....................................................................................................
........................
(d) Name any 2 other components apart from the one under
investigation
(i)..................................................................................................
............
(ii).................................................................................................
............

33. The figure 5 is part of a fore limb of a mammalian skeleton.

(a) Name the parts labeled 1 to 4 .

(2mks)
1) ...........................................................................................
2) ...........................................................................................
3) ...........................................................................................
4) ...........................................................................................

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 (b) Name the types of joints at
(1mk)
(i)
A ..............................................................................................
(ii)
B ..............................................................................................
(c) Name the muscle labeled (1mk)
(i)
Y.................................................................................................
(ii)
Z................................................................................................
(d) Explain how muscles Y and Z work
(6mks)
...............................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
...............................................................................................................
...............

SECTION C:
Attempt any two questions

34. (a) Define the term Homeostasis? (1mk)

(b) Describe how blood sugar level is regulated in the body
(6mks)
(c) Describe how the liver in man regulates
(i) Amino acids (3mks)
(ii) Body temperature (3mks)

(d) State any other substances stored by the liver.

(2mks)

35. (a) State the adaptations of tape worms to their mode of life.
(5mks)
(b) Describe the life cycle of a beef tape worm (Teania seginata).
(7mks)
(c) State the problems faced by tape worm when in the intestines

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 of man.
(3mks)

36. (a) Define photosynthesis? (1mk)

(b) Write a summarized equation for photosynthesis.
(1mk)
(c) Describe an experiment to show that light is necessary for
Photosynthesis.
(8mks)
(d) State the factors that affect photosynthesis.
(2mks)
(e) Give three importances of photosynthesis in nature.
(3mks)

37. (a) Define the terms below

(i) allele (1mk)
(ii) test cross
(1mk)
(iii) sex linked character
(1mk)

(b) (i) State three examples of sex linked characters you know.
(1½mks)
(ii) Using illustrations, describe how sex is determined in human.
(4mks)

(c) In humans, albinism is controlled by a recessive allele – a.

Marriage
between a man with a normal skin colour and an albino wife
resulted
into offspring who are all carriers.

(i) Give the genotypes of the man, his wife and their off springs.
(1½mks)
(iii) Work out the result of marriage between their daughter and a
carrier
Male.
(5½mks)

END.

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