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    Biology f4t1 Pp3 2024 - Ms

    Uploaded by

    Junior Tyoixie

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    © All Rights Reserved
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    Biology f4t1 Pp3 2024 - Ms

    Uploaded by

    Junior Tyoixie
    4 views4 pages

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    © © All Rights Reserved

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    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    4 views4 pages

    Biology f4t1 Pp3 2024 - Ms

    Uploaded by

    Junior Tyoixie

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 4

    Name…………………………………………………class…………Adm. No……......

    231/3
    BIOLOGY
    (Prac cal)
    Paper 3
    Time: 1 ¾ hours
    MARKING SCHEME.
    1. You are provided with specimen R, use it to answer the ques ons that follow.
    a) Cut a longitudinal sec on of specimen R to obtain two halves. Draw a surface of the cut specimen
    and label a seed and pericarp. (4mks)

    b) State the type of placenta on in the specimen. (1mk)


    Basal;

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    c) Crush the remaining pieces of the specimen using a motor and pestle. Add 10ml of water to obtain
    a paste. Decant the fluid in a beaker provided. Using the reagents provided, test for the food
    substance in the fluid. Record your observa on in the table below. (8mks)
    Food substance Procedure Observa on Conclusion
    Vit C; Add the food substance into The DCPIP is Vit C present;
    DCIPIP drop wise; decolourised;

    Proteins; Add CuSO4 solu on to the food The solu on turns Proteins absent;
    substance in a test tube and yellow/ purple
    shake, colour does not
    Add NaOH solu on dropwise; appear;

    2. Below is a plant organ used in the study of biology. Study it and answer the ques ons that follow.

    a. Iden fy the organ. (1mk)


    Flower;
    b. Name part H and state its func ons. (2mks)
    H – Sepals.
    Func on – protect the flower during the bud stage;
    c. State the term used to describe the petals. (1mk)
    Polypetalous;
    d. State with a reason the class into which the organ belongs? (2mks)
    Class – Dicotyledonae;
    Reason – Five petals/ five s gmas;
    e. i. Name the agent of pollina on. (1mk)
    Insect;
    ii. state a reason for your answer in (i) above. . (1mk)
    - brightly coloured petals/ conspicuous;
    2

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    f. State the importance of the organ to a plant. (1mk)
    Reproduc on;
    g. Measure the length of the petal from point A to B. (1mk)

    h. If the actual length of the petal is 5cm, calculate the magnifica on of the photograph above.
    (2mks)

    3. The specimens in the diagrams below were obtained by a class during an ecological study. Use
    the dichotomous key provided below to place all the specimens into their families.

    Dichotomous Key.
    1 a) Animal with Wings………………………………………………………….…go to 2
    b) Animal without wings……………………………………………………….…go to 3

    2. a) Animal with one pair of wings……………………………………. …..……. Muscidae


    b) Animal with two pairs of wings…………………………………………. …Aeshnidae.

    3 a) With three pairs of legs ………………………………………………….…. Formicidae


    b) With more than 3 pairs of legs…………………………………………….……. go to 4

    4. a) With four pairs of legs………………………………………………………. Araneidae


    b) With more than four pairs of legs………………………………………………. go to 5

    5. a) With two pair of antennae…………………………………………………...…. go to 6


    b) With one pair of antennae………………………………………………….……go to 7

    6. a) With six pairs of legs……………………………………….……….…. Microcerberidea.


    b) With ten pairs of legs…………………………………………………………Alpheoidea.

    7. a) With a cylindrical body……………………………………………… ...Sphearotheridae.


    b) With a dorso – ventrally flattened body……………………………………...Pselliodidae
    3

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    i. Give the families and the steps followed to identify the specimens E, F, G, H, and J. (10 mks)

    Specimen Steps followed Identity


    E 1a, 2a Muscidae;
    F 1b,3b, 4a Araneidae;
    G 1b,3b,4b,5a,6b Alpheoidea;
    H 1b,3b, 4b,5b,7b Pselliodidae;
    J 1b, 3b,4b,5b,7a Sphearotheridae;

    ii. The scientific name for specimen E is Musca domestica. Classify the specimen into the following
    taxonomic units. (6mks)
    Kingdom- Animalia;
    Phylum – Arthropoda;
    Class – Insecta;
    Family - Muscidae;
    Genus - Musca;
    Specific name – Domestica;

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