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BIOLOGY PRACTICAL QUESTIONS – SOTIK DISTRICT – 1ST EXAM

 

  1. egg albumen

  Pineapple juice  mixture (10ml) labelled Z

  Iodine solution

  Ethanol

 Distilled water

 DCPIP

 Benedict’s solution

  Source of heat (hot water bath)

  Four (4) test-tubes

 2. Bougainvillea leaf –P

  Kikuyu grass leaf -Q

  Hand lens

 

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 3. Hand lens

  Freshly killed housefly

  Safety pin/pair of forceps

 

 

1.  (a) You are provided with the solution labelled Z. Using the apparatus and the reagents

provided, carry out the tests for the various food substances

Food

Procedure

Observation

Conclusion

    
    
    

(b) State the organ(s) which produce(s) enzyme(s) which are required to digest the contents

of solution Z completely

 (c) Name the end products of digestion of solution Z

 (d) Give two functions of the products named in (c) above in the human body

2.  You are provided with the specimens P and Q:

(a) (i) What is the mode of nutrition for the organisms represented by the above specimens?

(ii) Give a reason for your answer in (a) (i) above

(iii) Write an equation for the physiological process involved in the mode of feeding in (a)(i)


above

 (b) Draw and label specimen P

 (c) State three observable differences between specimens P and Q  

  (d) Name the trophic level of the organisms from which the specimens were obtained

in the ecosystem  

 (e) Explain the role played by the organisms in the ecosystem

 (f) Which features adapt specimen Q to enabling the organism from which it was detached

to live in its habitat?

3.  Using a hand lens, study the specimen provided and answer the questions that follow:

 (a) Give the phylum and the class to which the specimen belongs

 (b) State two characteristics which are unique to members of the class suggested in (a) above

(c) Using the observable features only, explain how the specimen is adapted to living in its

habitat.

 

 

 

SOTIK DISTRICT 2ND EXAM BIOLOGY PRACTICAL MARKING SCHEME (ANSWERS)

1(a)

FOOD

PROCEDURE

OBSERVATION

CONCLUSION

STARCH

To 2mls of Z is added 2 drops of

iodine solution

The colour of the

mixture

remained brown

The solution does not

contain starch

REDUCING

SUGAR

2ml of solution Z is mixed with

2ml of benedict’s solution and

heated

The colour of the

mixture

turned blue

Absence of reducing

sugar

VITAMIN C

2ml of DCPIP is placed in a

test tube and solution Z

is added drop wisely

The DCPIP is decolorized

loses its colour

Vitamin C is present

LIPID

2ml of solution Z is put in test

tube and ethanol added until it

clears then distilled water is added

White colour develops

Lipids present

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 NB/  -exact quantities must be mentioned  

-correct order of chemicals    -correct colours

 

 b) Pancreas reject pancrease  

 c) Fatty acids and glycerols     (Reject if one is missing

 d)-can be broken down; to liberate energy; for cellular functions  

-can be used to synthesize; structural components of the cell; OWTTE

 

 

 

2.  a) i) autotrophic (nutrition)- (1mk) Reject. Antotropism

  ii) They are green hence has chlorophyll for photosynthesis;

  iii) Carbon (iv) oxide+ water sunlight glucose +oxygen

  Chlorophyll

 6 CO₂+6 H₂O C₆H₁₂O₆+6 O

 

NB.-chemical symbols must be correct

-the equation must be balanced

 b)  NB.-all rules for drawing apply

  -1 mark for accuracy (1×1=1mk)

  -max of 3 correctly labelled parts (3×1=3mks)

 

P

Q

i)has broad lamina

ii)has hairless lamina

iii)lamina has network of veins

-has narrow lamina

-has hairy lamina

-lamina has parallel veins

OWTTE

 

3. a)Phylum :Arthropoda. Reject. Anthropoda/Arthropod

Class: insecta. Reject insect

b)-the body has 3 pairs of leg (jointed legs/6(jointed legs)  

-the body is divided into 3 clear body parts (i.e. head, thorax and abdomen)

Reject if no mention of distinguished parts

ACC. Any other correct feature max

c)-has very large compound eyes; for spotting; food, enemies, mates etc

-has (6) muscular legs; for efficient locomotion; in search of food, mates etc  

-proboscis; for efficient sucking of liquid food; OWTTE  STK

 

 




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