NAME……………………………………………………….ADM NO…………………CLASS…………..
KCSE ONLINE EXAMS
TERM 2 END TERM EXAM 2014
BIOLOGY FORM 3
TIME: 2HRS
SECTION A
1. The term Biology has been derived from two Greek words. List the two words and the meaning of each.
(2mks)
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2. Name two instruments used in the laboratory for magnification.
(2mks)
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3. State the function’s of the following organelles.
(2mks)
i) Mitochondria
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ii) Lysosomes
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4. State where the following stages of photosynthesis occur in the chloroplast.
(2mks)
i) Light stage ________________________________________________________
ii) Dark stage _______________________________________________________
5. A 4cm straight piece of stem from an herbaceous plant was split lengthwise into two similar pieces. The pieces
were placed in sugar solutions of different concentrations for 30 minutes. There appearance after the 30 minutes
was as shown below.
a) Which biological process was being investigated? _____________________________________ (1mk)
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b) Other than the process you have written in (a) above, list two other physiological processes.
(2mks)
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6. Name the deficiency disease caused by lack of vitamin A.
(1mk)
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7. The diagram below represents a section through a human tooth.
i) Name the type of tooth shown.
(1mk)
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ii) Give a reason for your answer in (i) above.
(1mk)
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iii) Name two structures found in the part labeled B.
(2mks)
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8. Name the respiratory surfaces in;
(3mks)
i) Insects _____________________________________________________________
ii) Man
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iii) Fish
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9. Examine the diagram below answer the questions that follow.
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a) Name the structures labeled
A _____________________________________________________
B _____________________________________________________
H ____________________________________________________
b) Give two adaptations of the cell labeled X.
(2mks)
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c) State two functions of the cell labeled X.
(2mks)
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10. i) List two types of respiration.
(2mks)
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ii) Name the compounds formed when glucose is broken down in the absence of oxygen in;
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Animals
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Plants
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(2mks)
iii) Give two reasons as to why fats are not used as the major respiratory substrates though they yield the highest
amount of energy in KJ.
(2mks)
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iv) The complete oxidation of the fat tripalmitin is shown below
2C5H98O6 + 145O2
Calculate the RQ
102CO2 + 98H2) + energy
(2mks)
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11. Name two common diseases of the liver.
(2mks)
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12. Name any two excretory products in plants that are of medicinal value to man.
(2mks)
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13. State two functions of the substance secreted by the sebaceous glands in the mammalian skin.
(2mks)
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14. List the names of the hormones that control the following processes in the kidney tubules.
(2mks)
i) Reabsorption of water ___________________________________________________________________
ii) Reabsorption of sodium and chloride ions ___________________________________________________
15. Explain the following terms;
i) Identical twins
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ii) Siamese twins
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iii) Fraternal twins
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iv) Parturation
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v) Copulation
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16. State the function of sartoli cells in the male reproductive system.
(1mk)
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17. State three adaptations of the oviducts to their functions.
(3mks)
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18. The diagram below shows a section through a plant organ.
i) Name the class of the plant form which the section was obtained.
(1mk)’
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ii) Give a reason for your answer in (i) above.
(1mk)
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iii) Name the parts labeled;
(3mks)
A ______________________________________________________
B ______________________________________________________
C _______________________________________________________
iv) State the function the part labeled B.
(1mk)
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SECTION B
19. Examine the drawings of the leaves and the dichotomous key shown below.
1. a) Leaf simple --------------------------------------------------------------- go to 2
b) Leaf compound …………………………………………………. go to 5
2. a) Leaf parallel veined …………………………………………….. commelinaceae
b) Leaf network veined…………………………………………….. go to 3
3. a) Leaf margin smooth ……………………………………………… go to 4
b) Leaf margin serrated …………………………………………….. verbenaceae
4. a) Leaf apex acute …………………………………………………. nyctaginaceae
b) Leaf apex emarginated ………………………………………….. Fabaceae
5. a) Palmately compound leaf ………………………………………. malvaceae
b) Pinnately compound leaf ……………………………………….. go to 6
6. a) Bipinnate compound leaf ……………………………………….. Bi gnoniaceae
b) Unipinnate compound leaf……………………………………… go to 7
7. a) Leaf with terminal leaflet………………………………………. Rosaceaae
b) Leaf without terminal leaflet…………………………………… papillionaceae
Using the key, identify each of the following leaves;
A-H into their respective families. In each case, give the sequence of steps which you followed in identifying each
leaf.
(8mks)
Leaf
A
Steps followed
Identity
B
C
D
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E
F
G
H
20. The diagram below represents a mammalian embryo and the associated maternal structure.
a) Name the parts labeled;
R _____________________________________________________________
S _____________________________________________________________
b) i) Give the names of the blood vessels found in the structure labeled P.
(2mks)
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ii) Give the functions of each blood vessel you have written in b(i) above.
(2mks)
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c) State three features that enable the part labeled Q to carry out its functions.
(3mks)
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d) What is the function of T?
(1mk)
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21. The figure below shows the changes in blood levels of hormones that take place during the menstrual cycle in a
human female.
a) Name two hormones whose concentrations are represented by curves X and Y.
(2mks)
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b) State two effects f hormone X during the menstrual cycle.
(2mks)
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c) List two roles of Follicle Stimulating Hormone (FSH) in female reproduction.
(2mks)
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d) What is the role of a light concentration of luteinising hormone?
(1mk)
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e) State the fertile period during the menstrual cycle.
(1mk)
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22. Some students used a model to demonstrate the effect of sweating and insulation of human body temperature.
Three round bottomed flasks A, B and C were filled with hot water. The temperature of water in the flasks was
taken at the start of the experiment and then at 10 minutes interval. The surface of tube A was continuously wiped
with a piece of cotton wool soaked in ethanol. Flask C was covered all round with cotton wool. The results
obtained are shown in the table below.
Time in minutes
0
10
20
30
40
50
60
A
85
50
35
29
25
21
19
Temperature in flask, 0C
B
C
85
85
68
78
56
75
45
72
40
71
36
70
33
69
a) On the same axis, plot graphs of temperature of water in the flasks against time.
(7mks)
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b) At what rate was the water cooling in flask A?
(2mks)
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c) Why was flask B included in the set up?
(1mk)
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d) Account for the rate of cooling in flask A.
(2mks)
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e) State two processes of heat loss in flask B.
(2mks)
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f) Account for the rate of cooling in flask B.
(2mks)
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g) What would the insulation used in flask C be comparable to in mammals?
(1mk)
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