BIOLOGY PAPER 3 - 2019 KCSE Prediction Questions Set 1

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BIOLOGY PAPER 1 Marking Scheme - 2019 KCSE Prediction Answers Set 1

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1. You are provided with a solution L. Using the reagents provided; determine the food compounds in L. Fill in the table below.
  
  FOOD COMPOUND
  
  PROCEDURE
  
  OBSERVATION
  
  CONCLUSION
2. Place 10mls of solution L in a visking tubing. Tie both ends and place it in 50mls of distilled water contained in a beaker.leave the set up for 20 minutes and make observations.
  1. Observations. (1mark)
  2. Account for the observation in b (i) above. (2marks)
  3. Give the equivalent of a visking in the bodies of living organisms. (1mark)

Study the photomicrograph of the longitudinal section of a maize fruit below and answer the questions that follow.
1. 1. Name the parts labelled A, B, C and D. (4marks)
    A
    B
    C
    D
  2. Give the role played by A and D. (2 marks)
    A
    D
2. 1. Name the type of germination exhibited by maize grain. ( 1 mark)
  2. Place the organisms from where the photomicrograph was obtained into its
    Kingdom
    Division
    Class (3marks)
  3. State three characteristics of members of the class identified in b (ii) above (3marks
3. Give one reason why the maize grain is classified as a fruit. (1mark)

Study the organisms drawn below and answer the questions that follow.
1. Use the dichotomous key below to identify the class the organisms belong to. (12 marks)
  1. 1. Phylum Chordata ……………………………………………………… go to 2
    2. Phylum arthropoda ……………………………………………………. go to 3
  2. 1. Has scales on the body ………………………………………………… go to 4
    2. Has no scales on the body …………………………………………..… Mammalia
  3. 1. Has cephalothorax ……………………………………………….……. Arachnida
    2. Has no cephalothorax …………………………………………………. go to 5
  4. 1. Has fins ………………………………………………………………… Pisces
    2. Has no fins ……………………………………………………………... go to 7
  5. 1. Has three pairs of legs …………………………………………………. Insecta
    2. Has more than three pairs of legs ……………………………………… go to 6
  6. 1. Two pairs of legs per segment ………………………………………… Diplopoda
    2. One pairs of legs per segment …………………………………………. Chilopoda
  7. 1. Has feathers ……………………………………………………………. Aves
    2. Has no feathers ………………………………………………………… go to 8
  8. 1. Has a tail ……………………………………………………………….. Reptilia
    2. Has no tail …………………………………………………………….. Amphibia
      
      Specimen
      
      Step followed
      
      Identity
      
      A
      
      B
      
      C
      
      D
      
      E
      
      F
2. If the actual length from the tip of the mouth to the tip of the tail of the specimen B is 100mm, calculate the magnification. (2marks)