Home Education Exams KCSE Biology Paper 2 2014 PDF: Free Past Papers

KCSE Biology Paper 2 2014 PDF: Free Past Papers

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KCSE Biology Paper 2 2014 PDF: If You are among the Candidates that will be writing Biology in the upcoming KCSE exams this year, review the past paper 2, It is very helpful. After a successful download of the PDF of KCSE Biology Past Paper 2 for 2014 year, and start practicing the KCSE Biology Paper 2 2014 consistently You will see good results.

KCSE Biology Paper 2 2014 PDF

What to expect: kcse Biology past papers 2014, KCSE BIO Paper 1 2014, kcse Biology 2014 questions and answers, kcse Biology topics, KCSE Biology Paper 2 2014 and more

The KCSE Biology past Papers with answers will prepare You for the upcoming KCSE exams 2020, We believe that past questions are worth It when it comes to revision for KCSE examinations. You must know that there are no new questions, it’s just a repetition of already-set questions but in a different tricky form.

KCSE Biology PAPER 2 2014 WITH ANSWERS

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Kenya Certificate of Secondary Education Biology Past Paper 2

KCSE Biology Paper 2 2014 Questions and Answers
KCSE Past Papers 2014 BIO Paper 2

BIO paper 2

 

  • 1 a)Is when the rate of water loss is more than the rate of absorption and the plant droops; l mark

    b)The rate of active transport increases with increase intemperature up to the optimum temperature; 1 mark

    Further increase in temperature slows down the rate of active transport until it stops because it denatures enzymes; _ 1 mark

    2 a)Animal cell; 1 mark

    b)Has cell membrane only/has no cell wall;

  • Has numerous small vacuoles;
  • Has central nucleus; Max. 2 marksc) Consists of many similar cells performing the same function; l mark

    3 a)Have mammary glands; have extemal ears/pinna;

    Body covered with fur/hair; ‘ Max. 2 marks

    b)Class; l mark

    4 a)Lubrication; Protection; 2 marks

    b)Young people are more active; requiring more energy;/

    Older people are less active; requiring less energy; 2 marks

    5 As the cell gains water by osmosis; the sap/cell vacuole enlarges; pushing the cytoplasm outwards; exerting pressure on the cell wall; Any 3 3 marks

    7 Water molecules cling to each other maintaining a continuous column of water/preventing the break of water column;

    8Water molecules cling to the sides of the xylem vessel walls; l mark

    1(a) -- Leaf with serrated margin — go to 2;

    (b) -- Leaf with smooth margin — go to --; 2 marks

    9.a)Presence of myelin sheath for insulation/increases transmission; Axon for transmission of impulses;

    Large cell body controls activites of cell; Nerve endings/dendrites receives impulses from receptors cells;

    Node of Ranvier speeds up impulse transmission. b)Inner membrane highly folded/cristae to increase S A for attachment of (respiratory) enzymes.

    4 marks

    10. Cells loosely arranged; to facilitate air circulation;

    Cells have moist surfaces; to dissolve respiratory gases; 2 marks

    11. Can receive blood from any donor/ universal recepient; l mark

    12.a)(i) Arachnida; l mark

    (ii) Spider/scorpion/tick/mite; l mark

    13.Protoctista/protista; l mark

    Autotrophic nutrition; show alternation of generation; Limited movement;

    Limited excretory products/unspecialized respiratory structures; Localised growth; 2 marks

    14 .Alcohol/ethanol; Carbon (IV) oxide; Energy/Adenosine Triphosphate; 3 marks 15 To increase supply of oxygen to the tissues;

    The oxygen is used to oxidize lactic acid (to carbon (IV) oxide, water and energy);

    2 marks

    16 . Protogyny; protandry; Dioecious; Dichogamy;

    Self sterility/incompatibility; Heterostyly;

    Presence of structures/substances to attract agents of pollination; Max. 3 marks 17 .Ovary /Anther; l mark

    18Acrosome/Lysosome contain enzyme to digest membrane of the ovum;

    -- Numerous mitochondria to provide energy for movement;

    -- Long tail for faster movement; Max. 2 marks

    19Embryo not fully developed;

    -- Chemical inhibitors/presence of abscisic acid;

    -- Hard/impermeable testa/seed coat;

    -- Low horrnones/low enzymes concentration; Max. 3 marks

    20. Genetically acquired beneficial characteristics which occur spontaneously; are perpetuated through reproduction; 2 marks

    21. Continents existed as one large Landmass/Pangea/Laurasian and Gondwana Land;

    Present continents drifted from it leading to isolation of organisms; organisms in each continent evolved along different lines hence emergence of new species; 3 marks

    22. a)Emergence of new life/species/organisms from pre-existing simple forms, gradually over a long period of time, to present complex forms; 1 mark

    b) Thigmotropism/haptotropism; l mark

    Part of the tendril in contact with support causes migration of auxins to the opposite side;

    leading to faster cell division/growth on the side not in contact with the support; This causes the tendril to curl around the support;

    3 marks

    23.Use of biconcave/concave lens/divergent lens; to diverge the rays and make image be focussed on the retina; 2 marks

    24.Contains antibodies that defend the body from foreign antigens;

    -- Has white blood cells that produce antibodies/while blood cells engulf antigens;

    -- Has platelets that initiate blood clotting to prevent excessive bleeding at an open wound prevent entry of pathogens;

    3 marks

    25. Thin and long to allow for capillarity;

    -- Walls lignified to strengthen the stem/to prevent collapse of vessels;

    -- Have bordered pits to allow for exchange of materials;

    Max. 2 marks

    26. Genes inherited along with the sex chromosomes; l mark

    Haemophilia; hairy ears/pinna/nose; colour blindness/red green; blue-green colour blindness;

    Muscular diastrophy; baldness

    2 marks

    27 . a)Complete metamorphosis -- eggs hatch into larvae while in incomplete metamorphosis hatch

    into nymphs which resemble the adult;

    Complete metamorphosis has four stages; egg, larvae. pupa and adult while an incomplete metamorphosis has three stages; egg, nymph and adult. 2 marks

    b)To allow for growth of the insect; l mark

    28. a)Ligaments; synovial fluid; synovial membrane; articular cartilage;

    synovial capsule; a bone with rounded head fitting into a cavity of another bone;

    Max. 2 marks

    b)(i) Atlas; (ii) Axis allows movement in all planes; 2 marks

    29Form\joints with the legs to make walking possible; l mark

    -- Provide large surface area for attachment of muscles; l mark

    -- Offers support (to the body weight)

    30Absorption of water; support;

    Opening and closing of stomata;

    Feeding in insectivorous/plants; 2 marks

 

KCSE Biology Paper 2 2014 Questions and Answers

KCSE Biology Marking schemes Paper 2 2014

BIO paper 2

1.a)(i) B -Seta/stalk;

D- Rhizoid;

(ii) A- Production of spores/sporulation;

C -Photosynthesis;

b)(i) Arthropoda;

(ii) -- Segmented body;

-- Jointed appendages;

-- Presence of exoskeleton

2 a)E Semi circular canals;

F Oval window/Fenestra ovalis/Fenestra vestibuli;

G Cochlea; 3 marks

b)(i) Lined with hair/secretion of wax/(has glands that secrete wax) to trap foreign bodies;

Hollow/tubular/tube; to direct sound waves to the ear drum/tympanum/tympanic membrane;

(max) (2 marks

(ii) Small/form a lever system/solid; to amplify (sound) vibrations; (2 marks) c) Deafness! absence of pinnal vertigo/tinnitus; (max) (1 mark

3.a) (i) Provides energy needed to split water molecules into oxygen and hydrogenl photolygis;

Provides energy for formation of ATP molecules (which is used in dark stage) (1 mark)

(ii) Combines with hydrogen ions to make glucose; (1 mark)

(iii) Used to trap light energy; (1 mark)

b) (i) Starch;

(ii) Protein; (2 marks)

c) (i) Lack of vitamin Bl/thiamine; (1 mark)

(ii) -- Stunted growth;

-- Paralysis of legs/arms/limbs/damage to peripheral nerves;

-- Heart failure

-- Swelling of feet/oedema

-- Gastrointestinal disturbances/loss of appetite/sonstipation/diarrhoea/vomiting;

-- Weight loss/muscle wasting

-- Pale skin (2 marks)

4.(a) Parental phenotypes Smooth Wrinkled

Meiosis

(b) Parental genotypes

(i) Genotypic ratio

(ii) Phenotypic ratio 3 smooth coats 1 wrinkled coat;

(c) The total number of wrinkled seeds.

(1 mark)

1/4 x 14,640 = 3660 ; (2 marks)

5.a)(i) H -- It is long/wide/broad/fiat; to provide a large surface area for attachment of muscles;

-- Has facets; for articulation with sacrum; (2 marks)

(ii) J Has flexible cartilage; which allows for widening of the (female) pelvic girdle when giving birth/to absorb shock.

(2 marks)

b)Allows passage of blood vesselslnervesl and muscles: (1 mark)

(i) Femur; 1 mark

(ii) Ball and socket; l mark

Coccyx; l mark

See graph on the next page. c) (i) No change in population/population is constant; mice still maturing/have not given birth; (2 marks)

(ii) Slow/gradual population growth; few mice have reached sexual maturity; (2 marks)

(iii) Faster/rapid rate of population growth/exponential;

Many mice sexually matured/reproducing/enough food/space/no competition/ birth rate higher than death/no diseases: (2 marks)

(iv) Population decline;

Competition is high / food is limiting / space is limiting/accumulation of toxic waste/disease (outbreak) deathrate higher than birth rate.

(2 marks)

6.(i) 6 and 8 ; (l mark)

(ii) 310 -- 115 = 195 mice per month;

(2 marks)

Population would increase; (1 marks)

Food; space ; cage size; water;

(max) (2 marks)

7 .a) When a blood vessel is cut/injured platelets/thrombocytes/damaged tissue/wound is exposed to the air; they release thrombokinase/thromboplastin ; an enzyme that activates the conversion of prothrombin; to thrombin; in the presence of calcium ions;

vitamin Kl phylloquinone ; is needed for the formation of prothrombin;

Thrombin convens (soluble blood protein) fibrinogen ; into (the fibrous form) fibrin;

which forms a mesh / network across the wound; The clot so formed prevents excessive bleeding; and entry of disease agents/pathogens/micro-organisms/microbes;

Max 10 marks

b)Many to provide a large surface area; across which large amounts of gases diffuse;

moist surfaces; to dissolve respiratory gases; so as to diffuse. Made of a thin membrane/epithelium/one cell thick wall ; to reduce diffusion distance;

Highly vascularized; to carry away oxygen; and bring in carbon (IV) oxide; creating a steep diffusion gradients. (10 marks)

8.Regulation of blood sugar ;
when blood sugar is below nomtal/90 mg/ 100 cm3 glucagon ;
triggers the conversion of glycogen to glucose in the liver ;
the glucose is released into the blood stream.

When blood sugar is in excess above normal/10 mg/100 cm’, insulin;
causes the liver to convert glucose excess to glycogen ;
which is stored.

Production of heat energy ;
by increasing the rate of metabolic activities;
Excretion of bile pigments ;
produced due to breakdown of wom out red blood cells;
Deamination/removal of amino group of excess amino acids to form urea; and detoxication/poisonous/toxic substances;

(Max l0 marks)

b) Sweat glands excrete urea; excess water;
and salts;
hence maintaining salt & water balance in the blood. Evaporation of sweat;
cools the body due to loss of latent heat of vaporization;
when the body temperature rises ;
blood vessels in the skin vasolidate;
allowing more blood to flow near the skin surface;
thus heat is lost to the environment byfadiation/convection.

The erctor pili mucle relaxes hair flattens ;
in a hot environment reducing insulation;
hence heat is lost from the body by radiationl convection; to the environment.

(max 10 marks)

Biology Paper 3 (231/3)

1 (i)Sternum; (1 mark)

(ii)The intemal intercostal muscles relax; pulling the ribs upwards; and outwards;

This increases the volume of the rib cage while pressure decreases;

Forcing air into the lungs;

(5 marks)

b)(i)Anterior/dorsal view; (1 mark)

(ii)Name -- Neural canal; (1 mark)

(iii)Function -- Passage of the spinal cord. (l mark)

V: It is thick and solid; for bearing the weight of the body (back) (2 marks)

S: It is long; to provide a large surface area for attachment of muscles;

(2 marks)

(i)image width = 9.8 cm;

(ii)Magnification = image length / width _

(iii)Actual lengthl width ‘

= 9.8:0.| 4.610.] Mg = >< 3 .12 ; Actual length AB -- lO.4 1 0.] : 2.13 = 4 83$ cm ; (5 marks)

3 .

1 a)Simple leaves …………………………..go to 2;
b)Compound leaves …………………….. …..go to 4;
2 a) Leaves net-veined/reticulate …………….go to 3;
b)Leaves parallel veined …………………….Commelinaceae;
3 a)Leaves with serrated margins ……………. Malvaceae;
b)Leaves with smooth (entire) margins…………….Nystaginaceae;
4 a) Leaves opposite ………………………… .go to 5;
b)Leaves pinnate ………………………………Bignoniceae;
5 a)Leaves trifoliate ………………………….Papilionaceae;
b)Leaves alternate ………………………….. .Compositae;
( 10 marks)

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KCSE Biology Paper 1 2014

->> Click Here to download Biology KCSE Paper 1 2014 PDF

KCSE Biology Paper 3 2014

->> Here are the KCSE Biology Paper 3 2014 exams that are available

Biology paper 3 Past papers are coming soon, please check back on this page from time to time

You can access the Questions via the paper 1 page for this subject, go to the page via the link above with the description  “Click Here to download Biology KCSE Paper 1 2014 PDF” and scroll down and You will see the 2014 Questions as it is in the paper 3 already provided.

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