Term 3 Form 4 Biology Exam Paper 3

INSTRUCTIONS TO CANDIDATES

 

1. You are required to spend the first 15 minutes of the 1 ¾ hours allowed for this paper reading the whole paper before commencing you work.
2. Answers must be written in the spaces provided.

 

For examiners use only

Question	Maximum score	Candidates score
1	16
2	14
3	10
Total score	40

 

1. Label two test-tubes X and Y. Into each put 2cm³ of distilled water and then 8 drops of olive oil.  To test tube X, add 8 drops of liquid labelled K₁.  Shake both test tubes and allow the contents to stand for 2 minutes.
2. Record your observation for;
3. Test tube X. (1 mk)

 

1. Test tube Y. (1 mk)

 

1. i) Name the process that has taken place in test tube X.                                           (1 mk)

 

1. State the significance of the process named in b(i) above in digestion. (1 mk)

 

• Name the digestive juice in humans that has the same effect on lipids as liquid K₁.

(1 mk)

 

1. Into which region of the alimentary canal is the juice secreted? (1 mk)

 

1. Label two test-tubes E and F. Place 1cm³ of liquid K₂ into each.  Add 4 drops of iodine solution into each test-tube.
2. Record your observation (1 mk)

 

2. Suggest the identity of liquid K₂. (1 mk)

 

Cut out a peeled cube whose sides are 1cm from the Irish potato provided.  Crush the cube to obtain a paste, place the paste in test tube E with its contents and shake.  Dip both test tubes E and F into a water bath maintained at 37^oC for 30 minutes.

 

• Test for the food present in the mixtures of test tube E and F using Benedict’s solution.

Test tube	Procedure	Observation	Conclusion
E
		1mk	1mk
F
	1mk	1mk	1mk

 

1. Account for the results obtained in c (iv) above. (3 mks)

 

1. What is the significance of test tube F in the experiments?                          (1 mk)

 

2. You are provided with specimen labelled J and K.
3. Identify the plant organ J and K. ( ½ mk)

 

 

1. Fill up the table below appropriately for specimen J and K

	J	K
Plant Division
Subdivision
Class

 

• State 3 observable differences between specimen J and K. (3 mks)

 

1. The following are transverse section of stems of plants from which J and K were obtained.

Identify the section for J and K by pairing the letters A and B with j and K correctly.

J _                                         ( ½ mk)

K                                        ( ½ mk)

 

1. State 3 observable structural differences between sections A and B. (3 mks)

	A	B
i)
ii)
iii)

 

1. Name tissues labelled U and V in diagram A. (2 mks)

U

V

 

• Name the tissue found between the tissues U and V in section labelled A. ( ½ mk)

 

 

1. State the role of the tissue named in (vii) above.

 

 

1. Study the following diagrams of a fresh water fish and a mammalian bone to answer the questions that follow.

1. Label on the diagram the parts of the specimen responsible for preventing the fish from:
2. Yawing – using letter Y (1 mk)
3. Pitching – using letter P (1 mk)

 

1. Name the parts of the fish that help in the following;
2. Change of direction during movement (1 mk)

 

1. Forward propulsion (1 mk)

 

1. What is the significance of the above fish:
2. Lacking a neck ( ½ mk)

 

1. Having a streamlined body? ( ½ mk)

 

1. Name the bones that articulate with the above bone:
2. Ventrally ( ½ mk)

 

1. Dorsally ( ½ mk)

Term 3 Form 4 Biology Exam Paper 1

Term 3 Form 4 Biology Exam Paper 2