Biology Paper 1 - Alliance High School Pre-Trial Examination 2018

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ALLIANCE HIGH SCHOOL
BIOLOGY PAPER 1
PRE-TRIAL
2018
2 HOURS

INSTRUCTIONS TO CANDIDATES

Answer all questions on the spaces provided this paper in English.

  1. Which study is required in dealing with army worms that infest maize crops in Trans-Nzoia. (1 mk)
  2. Give three reasons why pressure of blood is greater in the arterioles than in the veins of mammals. (3 mks)
    1. Which type of mammalian muscles is voluntary. (1 mk)
    2. Distinguish between a tendon and a ligament. (1 mk)
    3. Name the structure that connects the muscle to bone. (1 mk)
  3. The diagram below illustrates a growing pollen tube.

    pollen tube

    1. Name the part labelled B (1 mk)
    2. Explain the role of the parts labelled A. (1 mk)
  4. The diagram below shows a set up for an experiment to demonstrate a certain physiological process.

    physiological process

    1. What nature of solution is represented by 20% sugar solution. (1 mk)
    2. Explain the observation made on the set up after one hour. (2 mks)
  5.  
    1. State two roles of auxins in a plant stem. (2 mks)
    2. Explain how light affects the auxin distribution in non woody stems. (2 mks)
  6. Name the fins that prevent the following movements of fish during swimming. (2 mks)
    Yawing ...
    Pitching ...
  7. Name the types of gene mutation represented by the following analogues. (2 mks)
    INTENDED MESSAGE ACTUAL MESSAGE
    1. BRING THERMOS ON OUTING BRING MOTHERS ON OUTING
    2. PLEASE SAY WHERE YOU ARE PLEASE STAY WHERE YOU ARE
  8. State two characteristics of etiolated plants. (2 mks)
  9. The figure shown below represents a mammalian structure. Use it to answer the questions that follow.

    mamallian structure


    1. Name parts labelled A, C and D on the diagram. (3 mks)
      1. State structural difference between part A and B. (1 mk)
      2. State the importance of the above difference in b(i) above. (1 mk)
    2. Explain how part D is adapted to its function. (2 mks)
    3. Name two materials found in B and absent in D. (2 mks)
  10. Explain how cell membrane brings about protective role to the cell. (2 mks)
  11. 2C51H98O6 + 145O2 --------> 102CO2 + 98H2O
    1. Identify the process above. (1 mk)
    2. State the importance of the above reaction. (2 mks)
  12. Explain how an ovary is adapted to its function. (2 mks)
    1. Name the cells in animals which exhibit diploid state. (1 mk)
    2. State why the above state is disadvantagious to the organism. (2 mks)
  13.  
    1. What is meant by the term seed dormancy. (1 mk)
    2. State three causes of seed dormancy. (3 mks)
  14. State three ways through which a newborn acquires natural immunity. (3 mks)
  15. The diagram below shows the gaseous exchange system of a locust.

    gaseous exchange


    1. Name the substance that brings rigidity to R. (1 mk)
    2. Name the part labelled S. (1 mk)
    3. How is the part labelled Q structurally adapted to its function. (2 mks)
  16.  
    1. Explain how toxic ammonia is formed during some metabolic reactions. (2 mks)
    2. Name the cells where the above metabolic reaction occurs. (1 mk)
  17. What homeostatic effect would occur when one eats a meal with too much salt. (2 mks)
  18. Use the diagram below to answer the question that follows

    ring on stem

    1. Draw the set up how it would appear after a week on the space above. (1 mk)
    2. Explain the above appearance after a week. (3 mks)
    3. Name the hormone which would revert the effect of stem ringing. (1 mk)
  19. State two distinguishing characteristics found only in phylum chordata. (2 mks)
  20. What activates the trypsinogen to trypsin.. (1 mk)
    1. Differentiate between biomes and biomass. (1 mk)
    2. Explain how temperature determines decreas of animals' distribution in an ecosystem. (2 mks)
    3. Explain how eutrophication affects photosynthesis. (3 mks)
  21. Study the diagram below and answer the questions that follow.

    type of germination

    1. Identify the type of germination exhibited above. (1 mk)

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