kcse paper 3 biology by Domnic otieno

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BIOLOGY 231/3PRACTICAL PAPER 3EXAMINERS
PERSPECTIVEBY OTIENO DOMNIC
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BIOLOGY 231/3PRACTICAL PAPER 3Created By
Domnic Otieno

• EXAMINERS PERSPECTIVE

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Objective

• To address why candidates fail in biology
  practical
• To address the need for proper use technical
  language for communication with the examiner.
• To remind candidates that nothing has changed
  except the setting

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1.SEE THE MIND OF THE SETTER

• Easy question (2019) the habit of a plant is
  reffered to as tree, herb or shrub depending
  onits height. Suggest the habit of
• Lemon twig tree
• Aloe vera herb

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2 COMMON WORDS THAT MAY CAUSE LOSS OF MARKS

• i)Hand?
• Text book language and exam language KCSE 2019
• blood elements
• Granulocytes (just descriptive) basophil
  eosinophil
• ii) view use of side
• dorsal view is not the same as side

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VIEWS
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3.COMMAND WORD/LEAD WORD/ KEY WORD

• Do not include details not asked for 2018
• Draw organ for gaseous exchange (gill)
• On it label site for gaseous exchange
• Mistake candidates labelled all the 3 parts not
  asked for

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4 Drawing
i) Accuracy all parts must be drawn continuous
outline correct number of structures correct
shape demarcation between parts must be
clear ii)proportionality correct relative
sizes. Examplegill filaments should be thinner
than gill bar shorter downwards towards the end
not as in the text books
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CONT. OF DRAWING

• Drawing? use free hand no shading
• Hand lens use
• Outline
• Do not give many details not seen (2016) petiole
  of mango leaf
• Labelling skills
• Mind of the setter read the question twice
• Label on the photograph no writing below the
  questions
• Label line touch the structure
• Use pensil
• Do not give strucures the same name
• Dont include collective term among the label
  pericarp for exocarp, seeds for seed

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5.Hands on experiments Tables food tests tables

• Read the question
• Mind of the examiner

reagent observation explanation
     
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NOTES ON TABLES

• Be brief
• Blue-black (right)
• White to blue black (wrong)
• Colour changes long description creates room for
  mistakes
• Good handwriting
• Slarch/sturch (wrong)
• Procedure Be brief
• Mistake in one step all other marks goes.

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NOTES ON TABLES

• Watch the mind of the examiner synthetic enzymes
  maintained at 50-60 C. what sis the optimum
  temperature (35-wrong). Its 50-60).
• Observe the Amount of effervesence (2020)Command
  word-AMOUNT more less mostsmall average
  large
• Apparatus determine the procedure. Volume not
  given when measuring cylinder is not used

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6 classification

• Specific objective of the topic
• Practice construcuing dichotomous keymaster
  convectional style of constructing key use even
  vertebrae
• Complimentray characteristics leaf margin apex,
  type, shape,surface, vernation, arrangement of
  leaflets, texture

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7. process question

• Identify the process under investigation, tissue
  used in the process
• CAUTION In the explanation dont include other
  tissues that are involved in the process except
  by the command word
• Identify the lead word
• KCSE 2013 exculde unesessary details

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8. Specimens

• Give the identiy of the specimen humerus
  (wrong).
• Name the part of the plantflower,root, leaf,
  stem, fruit)
• Reason for identity restrict to the number given
  only
• Description of the specimen use appropriate
  wordsWrong usage
• Specimen juicy (talk of juicy mesocarp, brightly
  coloured exocarp, storny/hard seeds

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Cont.

• Adaptation to dispersal wrong(brightly
  coloured). Its petals that are brightly coloured
• Differences between specimens
• Apply observation skills colour, length, width,
  compare colour, number of structures, size of the
  features). (2011)
• Avoid negative comparisons stem B os longer than
  A.(wrong).
• Stem B is long and A is short

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9. Functional adaptation

• Separate the features and match them correctly
• Gill bar rigid and curved (two adaptaion (wrong)
  to increase SA
• Rigird For support
• Curved SA

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The End