|EKSIKA JOINT EVALUATION TEST BIOLOGY MSCM PP3
QUESTION 1 (15MARKS)
1 a) i) Specimen Q
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;
-Put specimen Q into a test tube
-Add 3 drops of idine solution
Colour turn blue-black
-Put Q in a test tube.
-Add 1cm3 of benedict solution
-Heat the mixture to boil
Colour turn from blue to green to yellow to orange
Reducing Sugar present
-Put Q in a test tube.
-Add CuSO4 then follow with NaOH
No violet/purple colour observed
QUESTION 2 (13MARKS)
2 a) From a carnivore
Sharp and pointed for tearing flesh from bones;
Has cusp for chewing and grinding;
b) Type B
Pre-molar or molar;
-Has three roots;
-Has cusps and large surface area for chewing and grinding
c) Functions of pre-molar or molar
-Chewing and grinding of vegetation and grass;
-Sharp cusps; and wide surface for chewing and grinding;
d) Difference between homodont and heterodont teeth
-Homodont type are similar in shape and size while heterodont are different in size and shape;
e) 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) T found on specimen A
-Tendril;Rj wrong spelling Acc. Plural.
ii) Type of response
-Thigmotropism/Heterotropism;Rej wrong spelling
iii) Stimulus in (ii) above
iv) Type of response exhibited by the coiled part on specimen A
v) The stimulus responsible for the response named in (ii) above.
vi) 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
vii) 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
b) Use photographed specimens labeled B1 and B2 above to answer the questions below.
Agent of pollination
-Brightly coloured petals
iii) Describe the external features of leaves of the specimen B2.
-Pointed apex of leaf;
iv) The class which specimen B belongs.
-Dicotyledonae; rej Dicotyledon
-Floral parts are in 5/multiple of 5s;