EKSIKA JOINT EVALUATION TEST BIOLOGY MSCM PP3
QUESTION 1 (15MARKS)
1
a)
i)
Specimen Q
Stem tuber;1
ii)
Reason.
Presence of scale leaf and burd;1
b)
i)
Observations.
A
Slow evolution of bubbles;1
B
Fast evolution of bubbles;1
ii)
Account for result (c) (i) above.
Potatoe cube in A has a small surface area for action of enzyme catalase;
Crushed potatoe cube in B has a large surface area for action of enzyme
catalase;
Food
Procedure
Observation
Conclusions
Substance
Starch
-Put specimen Q Colour turn blue-black Starch present
into a test tube
-Add 3 drops of
idine solution
Reducing
-Put Q in a test
Colour turn from blue Reducing
Sugar
tube.
to green to yellow to
Sugar present
-Add 1cm3 of
orange
benedict solution
-Heat the
mixture to boil
Protein
-Put Q in a test
No violet/purple
Protein absent
tube.
colour observed
-Add CuSO4 then
follow with
NaOH
QUESTION 2 (13MARKS)
2
a)
From a carnivore
A
Reason
Sharp and pointed for tearing flesh from bones;
From herbivore
B;
Reason
Has cusp for chewing and grinding;
b)
Type B
Pre-molar or molar;
Reason:-Has three roots;
-Has cusps and large surface area for chewing and grinding
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Biology Marking Scheme
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c)
d)
e)
Functions of pre-molar or molar
-Chewing and grinding of vegetation and grass;
Reasons
-Sharp cusps; and wide surface for chewing and grinding;
Difference between homodont and heterodont teeth
-Homodont type are similar in shape and size while heterodont are different in
size and shape;
General adaptation and functions of teeth
-Long to piece through flesh;
-Sharp to tear flesh from bones;
QUESTION 3 (11 MARKS)
3
Examine photograph A,B1 and B2 carefully and answer the questions that follow.B2 was
was extracted from B1
i)
ii)
iii)
iv)
v)
T found on specimen A
-Tendril;Rj wrong spelling Acc. Plural.
Type of response
-Thigmotropism/Heterotropism;Rej wrong spelling
Stimulus in (ii) above
-Contact;Rej touch
Type of response exhibited by the coiled part on specimen A
-Thigmotropism;
The stimulus responsible for the response named in (ii) above.
-Contact
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vi)
vii)
b)
i)
ii)
iii)
iv)
v)
How the response exhibited by the coiled part on the specimen A occurred
-Due to contact; the auxins/IAA move away from the surface of
contact/accumulated on the surface away from contact; where they caused faster
growth/cell elongation hence curling
Biological significance of the response described in (iv) above to the survival of
the specimen
-Has tendrils to provide support;(by coiling around firm support) to reach for light
Use photographed specimens labeled B1 and B2 above to answer the questions
below.
Agent of pollination
-Insects;
Reason
-Brightly coloured petals
Describe the external features of leaves of the specimen B2.
-Not veined;
-Serrate blade;
-Pointed apex of leaf;
The class which specimen B belongs.
-Dicotyledonae; rej Dicotyledon
Reason
-Floral parts are in 5/multiple of 5s;
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Biology Marking Scheme
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