Eksika joint evaluation test biology mscm pp3 question 1 (15marks)



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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 Substance

Procedure

Observation

Conclusions

Starch

-Put specimen Q into a test tube

-Add 3 drops of idine solution



Colour turn blue-black

Starch present

Reducing Sugar

-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

Protein

-Put Q in a test tube.

-Add CuSO4 then follow with NaOH



No violet/purple colour observed

Protein absent




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

c) Functions of pre-molar or molar

-Chewing and grinding of vegetation and grass;

Reasons

-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

-Contact;Rej touch

iv) Type of response exhibited by the coiled part on specimen A

-Thigmotropism;

v) The stimulus responsible for the response named in (ii) above.

-Contact

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

i) -Insects;

ii) Reason

-Brightly coloured petals

iii) Describe the external features of leaves of the specimen B2.

-Not veined;

-Serrate blade;

-Pointed apex of leaf;

iv) The class which specimen B belongs.

-Dicotyledonae; rej Dicotyledon

v) Reason



-Floral parts are in 5/multiple of 5s;


© 2015 Eksika Joint Evaluation Test 231/3 Biology Marking Scheme MALTYTECH PRINTERS



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