BIOLOGY REVISION KITS FORM 3 TERM 1 PAPER 1 MODEL26092022001
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BIOLOGY PAPER 1 FORM 4 TERM 2 REVISION QUESTION PAPER WITH MARKING SCHEME MODEL20220108T064525Z-00121/8/2022
K.C.S.E Biology Q & A - MODEL 2018PP1QN08
State three ways in which blood capillaries are structurally adapted to their functions.
a) Identify the type of asexual reproduction exhibited by yeast cells (1mk)
Budding;
b) List down the functions of the following parts; (3mks)i) Testis
ii) Fallopian tube
iii) Urethra
Passage of urine/sperms/semen;
State the importance of breathing through the nose than through the mouth. (2mks)
(a) A passenger was involved in a road accident. He couldn’t move his limbs and neck. Which part of the brain was affected? (1mk)
Cerebrum;
(b) (i)State two functions of cerebrospinal fluid. (2mks)
State how the following parts of the mammalian ear are adapted to their functions. (3mks)(i) Pinna
(ii) Eardrum
Its thin and flexible to enable transformation of sound waves into vibrations
(ii) Cochlea
Name two types of active immunity (2mks)
(a) Which process was being investigated? (1mk)
Anaerobic respiration
Rej: Respiration alone (b) Why was it necessary to boil the glucose solution? (1mk)
To expel all the dissolved oxygen;
(c) Write a word equation representing the chemical reaction taking place above in the boiling tube (1mk)(a) Identify the function of the part labeled Q (1mk)
Offers a large surface area for muscle attachment
(b) Name the bone that circulates with the bone above at the proximal end (1mk)
Humerus;
Rej: Humerous or other wrong spellings for humerus (c) List down two types of support tissue in plants (2mks)
List three characteristics that distinguish arthropods from organisms in kingdom Monera (3mks)
State three ways how HIV and AIDS is transmitted in human population (3mks)
What are the effects of releasing excess nutrients into lake Naivasha by the nearby flowers farms?1/11/2021 What are the effects of releasing excess nutrients into lake Naivasha by the nearby flowers farms? (3mks)
a) State the function of Juvenile hormone in insect metamorphosis (1mk)
leads to the formation of larval utricle;
b) (i) Give a reason why most insects are serious crop pests at the larval stage (1mk)
Growth rate in rapid/fast/high and shed cuticle several times hence feed a lot to have (desired) energy;
(ii) What happens at growth phase in insects growth curve (1mk)
State two physiological mechanisms of controlling the human body temperatures during a hot day1/11/2021 (a) State two physiological mechanisms of controlling the human body temperatures during a hot day (2mks)
b) Name two ways in which loop of Henle is adapted to its function (2mks)
a) List down two differences between closed and open circulatory systems (2mks)Open system
Closed system
b) Name two ways in which heart muscles are special (2mks)
a) Distinguish between homologous structures and analogous structures (2mks)
b) State a major shortcoming in Jean Baptiste de Lamarck’s theory of evolution (1mk)
That a phenotypically acquired characteristics can be transmitted to the offspring by their parents;
(a) Name the process shown by the equation above (1mk)
Deamination;
(b) List down a carbohydrate that is;-(i) Stored in the mammalian liver (1mk)
Glycogen;
(ii) Found in abundance in mammalian blood (1mk)
Glucose;
(a) What type of response was being investigated above? (1mk)Tropism/tropic response; (b) Which of the set up above would act as a control experiment? (1mk)(c) Explain what happened in set up B after 24 hours (2mks)The side brushed with IAA increased concentration of this hormone (IA; This lead to increased cell elongation/growth hence a growth harvature away from the brushed side;
The scheme below illustrates the blood clotting process;(a) Identify the following; (2mks)(i) Protein X
Thromboplastin / thrombokinase;
(ii) Enzyme Y
Thrombin;
(b) State down the role of ions Z in the scheme above (1mk)
Activates conversion ofinactive prothrombin to active thrombin;
(iii) Name a trait in humans determined by multiple alleles (1mk)
Blood groups;
Set-u A
(a) What is meant by the following terms; (2mks)(i) Ecosystem
A natural unit composed of abiotic and biotic factors whose instruction lead to a self sustaining system;
(ii) Carrying capacity
(b) Give two ways on how hydrophytes are adapted to the process of gaseous exchange (2mks)
Study the diagram below and answer the following questions.(a) (i) Identify the part labelled X (1mk)
Root cap;
(iii) State the function of part X above (1mk)
Protects the root tip from mechanical damage/abrasive effects of the soil particles as it grows
(b) List down two characteristics of cells in the region labelled Z (2mks)
(a) Define the term allele (1mk)
Alternative forms of a gene controlling a particular characteristic
(b) Differentiate between a dominant gene and a recessive gene (2mks)
A dominant gene expresses itself in both its homozygous and heterozygous states; while a recessive gene can only express itself in homozygous state.
Identify the use of the following apparatus (3mks)(i) Bait trap
For attracting and trapping small animals including rats
(ii) Specimen bottle
For keeping collected specimen;
(iii) Pitfall trap
For catching crawling animals;
State the functions of the following parts in a cell: Nucleolus, Smooth endoplasmic reticulum30/10/2021 a) State the functions of the following parts in a cell (2mks)(i) Nucleolus
Manufacture/synthesis of ribosomes;
(ii) Smooth endoplasmic reticulum
Transport of lipido
(b) Name an organelle that would be found in large numbers in cells of secretory glands (1mk)
Golgi bodies/Golgi apparatus;
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