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K.C.S.E Biology Q & A - MODEL 2019PP2QN08

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN08

Explain the effect of increased physical activity on the following organ systems: 
(a) heart
(b) lungs
(c) kidneys
(d) skin.
Picture
answers
​(a) Heart
-Increased heart beat/ rate/cardiac frequency; increase blood pressure; pumping more blood to the muscles/Peripheral blood vessels; at a faster rates; supplying oxygen; Nutrients; for continued oxidation/respiration; to yield energy needed to sustain the (vigorous) contraction/relaxation of muscles during the physical activity; carbon (iv) oxide /Lactic acid/other Nitrogenous wastes/Metabolic wastes produced during the process are also eliminated/ transported to the relevant excretory organs for elimination; the wastes ,if left to accumulate Can also intoxicate/poison cells/cause muscle cramps/pain/fatigue;
 
(b) Lungs
-Panting /increased breathing rates; cause the lungs to expand/increase in volume to take in more air/oxygen; and deflate to expel more carbon (iv) oxide; more oxygen is taken in (during exercise) to sustain the process of muscle respiration/to produce the required energy (for constant muscle contraction and relaxation);
 
  1. Kidneys
 
Kidneys also maintain the blood plasma pH; and osmotic balance; by elimination excess hydrogen ions(H+) that accumulate to production of Lactic acid/CO2 during the exercise;
To maintain the osmotic balance kidneys conserve sodium ions (Na+); and reabsorb water (in the kidney tubules); Leading to reduction in the volume of urine produced; During exercise the kidney tend to filter out urine releasing more in the urine;
 
(d) Skin
 - Due to increased muscle activity during physical exercise are sweats(more); Eliminating Nitrogenous wastes/ excess water; through the skin/sweat pores) cooling the body; After (water in) sweat evaporates the increased internal body temperature also leads to dilation of superficial blood vessels (vasodilation)/ blood flowing near the skin; leading to loss of excess heat (to the atmosphere) by radiation/ convection; the hair on the skin surface also lie Flat to allow for loss of heat( to the environment) by radiation/convection;
 
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K.C.S.E Biology Q & A - MODEL 2019PP2QN07

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN07

Giving examples, describe the following interactions among organisms: 
(a) predator-prey
(b) symbiosis
(c) parasitism.
Picture
answers
​.(a)       Predator-Prey
  • -Predator is an animal that hunts/kills another/ other animals(prey) for food;
  • -A dog and a hare; (acc. either correct examples)
  • Preys desire survival mechanism in their habitats not to be eaten/killed; to survive and reproduce/propagate this in linage; to this end (prey)(adaptations)
  • -They run faster (strong hind muscles);
  • -Camouflage with environments;
  • -Mimic the predators; (acc. some have a wider field of view/vision;)
  • -Some emits some chemical/smell that turn of predators;
  • -Others like porcupine use quills/ spikes/spines to fight off predators;
  • -Some have good sense of smell to detect predators; on the other hand, predators also evolve/desire means to be able to survive in such an ecosystem for instance.
  • -Running faster; strong jaws/long/sharp canine/talons;
  • -Camouflaging with the environment;
  • -Mimicking prey
  • -Sharp eyesight;
  • -Strong sense of smell
  • -Produce venom/poison that paralyze/kill prey.
(b) Symbiosis
  • A close (long term) association between two organisms of different species where the two mutually benefit from each other;
  • Example; The bacteria in the rumen/gut of herbivores; which help herbivores digest cellulose; as they are sheltered by the herbivores;
  • -The bacteria found in the human digestive system/gut/colon
  • -the bacteria are sheltered by humans;
  • -The bacteria aid human in synthesis of vitamin K/ B12/enzyme microbial balance;
  • -The nitrogen fixing bacteria on the root nodules of legumes;
  • -NFB benefits from shelter offered by the plant;
  • NFB facilitate conversion of free atmospheric Nitrogen into forms that can be readily used by the plants; 
(c) Parasitism
  • A kind of (inter-specific) relationship/Association where one member/organism, the parasite, benefits while the other the host is harmed/loses; Also called antagonistic symbiosis)
  • Example;
  • A tick (parasite) sucking blood /Nutrients from a cow (host); making the cow to be anaemiac/skin destroyed/malnourished/transmission of diseases;
  • Parasite can be external/Exo-Parasite; or internal/ endo-parasite; e.g. liver fluke
  • Example- Liver fluke sucks blood/Nutrients from host and cause death/bodily harm on the internal Organs of the host including blocking blood vessels
Comments

K.C.S.E Biology Q & A - MODEL 2019PP2QN06

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN06

 The table below shows the rate of product formation for two enzymes, H and J over a range of pH values
Picture
(a) On the same axis, plot graphs of the rate of product formation against pH. 
  GRAPH PAPER
(b) Account for the rate of product formation for enzyme H between:
(i) pH 1.0 and 3.0 
(ii) pH 3.0 and 7.0. 
(c) From the graph, determine: .
(i) the pH value at which the rate of product formation of the two enzymes was the same 
(ii) the value of the rate of product formation for enzymes H and J at the pH value stated in (c)(i) above 
(iii) the optimum pH value for enzyme J 
(d) State one variable that may lead to the change in the optimum rate of product-formation of the two enzymes. 
(e) Suggest with a reason, the likely part of the human alimentary canal where enzyme H would be found.
answers
Picture
​(b) (i) Rate of product formation increases with the increase in pH to the optimum then decreases;
   pH 5 is the optimum pH value for activity of enzyme H; between pH 1 and 2 enzyme H/enzyme molecules are activated; Between pH 2 and 3 enzyme H (enzyme molecules) are denatured/destroyed; (. Enzyme is inactivated/ less active for denatured
(ii) Rate of product formation (sharply) decreases with increase in pH; Enzyme H is (not formed by increase in pH hence is denatured); No product forms above pH 4.0 to 7.0; because all enzymes (enzyme molecules) are denatured;
(c) (i) 4.0
   (ii) 15.0 mg/hr
    (iii) 7.0
(d) -Temperature
-Substrate concentration;
-Enzyme concentration;
-Cofactors
-Co-enzymes
-(Enzyme) inhibitors
(e) Stomach;
Acidic medium/Low pH
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K.C.S.E Biology Q & A - MODEL 2019PP2QN05

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN05

 A person accidentally touches a hot pan and responds as illustrated in the diagram below.
Picture
(a) Explain how the response illustrated above occurs. 
(b) Explain how auxins are utilised as selective weed killers in agriculture.
answers
  • ​(a) The stimulus /heat/pain is detected by temperature/pain receptor( Thermo receptors) in the skin/dermis; An impulse is generated; impulse is transmitted along a sensory neurone to the CNS/spinal cord; (chemical) transmission across synapse to relay neurone; Across a synapse to motor neurone; across a synapse to biceps muscles,/effector via motor neurone; muscles/effectors contracts; (hand moves away). This is known as (simple reflex action);              
  • Stimulus/pain/temperature detector
  • Receptor-impulse-sensory neurone-synapse-relay neurone (CNS)-synapse-motor neurone-    synapse-biceps-control.
  • (b) Selective weed killer contains auxins which are absorbed by the weeds (than desired/ beneficial plants); making the weeds to grow abnormally/accelerated die out; (weed of the beneficial plants);
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K.C.S.E Biology Q & A - MODEL 2019PP2QN04

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN04

In cats, the gene for fur colour is sex-linked. Letter G represents the gene for ginger fur colour while letter B represents the gene for black fur colour in a given cat species. These genes are co-dominant. Heterozygous females have ginger and black patches of fur and their phenotype is described as tortoise-shell.
Picture
​(a) With reference to the information given above, what is meant by the term co-dominance? 
(b) Explain why male cats with a tortoise-shell phenotype do not usually occur. 
(c) A tortoise-shell female was crossed with a black male. Determine the genotypes and phenotypes of the offspring.
answers
Picture
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K.C.S.E Biology Q & A - MODEL 2019PP2QN03

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN03

 In an experiment, students treated seedlings as illustrated below.
Picture
​(i) Account for the observations made in seedling I. 
(ii) Explain the similarity in the end results made in seedlings II and III. 
(iii) State the likely treatment that would make seedlings II and III respond like seedling I.
answers
​(i) Positive phototropism/tip bends towards light; light causes migration of auxins (produced at the tip) to the darker sides; (of the shoot) resulting in faster division of cells/ elongation/growth on the darker /opposite side of the shoot hence bending towards light
(ii) both seedlings remain upright; ( erect) seedling II does not have tip while seedling III the tip has been covered by opaque material preventing light causing unequal distribution of auxins; . uniform/even distribution of auxins)
(iii) Fitting a gar block treated with auxins at the decapitated end of seedling II;  Removing the opaque material covering the tip of seedling III/ replacing the opaque cap with a transparent one;
Comments

State one importance of irritability to living organisms.

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN03

State one importance of irritability to living organisms.

Picture
answers
​(a) Enable living organisms to avoid dangerous/harmful/hash climatic environmental conditions; Enable living organisms obtain/access favourable environmental conditions (light, water, oxygen,
Comments

K.C.S.E Biology Q & A - MODEL 2019PP2QN02

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN02

The table below shows results of blood cell counts per mm3 of blood from a sample of people living at different altitudes.
Picture
​(a) Explain the relationship between:
(i) red blood cells count and the altitude; 
(ii) white blood cells count and the altitude. 
(b) Explain why chances of nose-bleeding increase with altitude in humans.
answers
(a) i) Number of red blood cells increase with altitude; to increase oxygen carrying capacity (by haemoglobin molecules in blood); since oxygen concentration is lower at higher altitude;
ii) white blood cells serve to protect the body against harmful microorganisms/pathogens; thernadites of pathogen of the body to microbial attack is not dependent on the altitude (to be countered by the white blood cell); hence 6 the number of white blood cell count is constant at whatever altitude;
 (b) Atmospheric Pressure decreases with the increase in altitude; the imbalance between the (outer)      atmospheric pressure at high altitude and the internal blood pressure (generated by the heart) results in (one) nose bleeding at high altitudes/ internal blood pressure is higher than the (outer) atmospheric pressure.
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K.C.S.E Biology Q & A - MODEL 2019PP2QN01

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP2QN01

In an experiment to investigate the effect of sodium chloride on the growth rate in a spinach seedling, seeds were treated with different concentrations of sodium chloride. The results are as recorded in the table below.
Picture
​(a) From the results in the table above, explain the effect of increasing the concentration of sodium chloride. 
(b) Apart from a ruler, state two other equipment one would need to determine the rate of growth in the roots. 
(c) With a reason, state one other part of the seedling the students would focus on to determine the effect of sodium chloride on growth. 
(d) State the likely effect on the seedling of increasing the concentration of sodium chloride to 2.20mol/l
answers
​(a) Increased Nacl concentration/having more Nacl ions decreases water potential/decrease osmotic potential/ increase osmotic pressure/makes water potential more negative outside the seed/seedling in the surrounding solution to be hypertonic to the cell sap in the seedling ; seeds cells take in water by osmosis) are dehydrated/lose water molecules to the surrounding solution , reducing the growth enzyme activity; have reduced  growth  rates;
(b) Threads(wire/string)
     Books;
     Pen; Marker (pen);
    Dye/water proof ink/ bloating paper/tissue paper
(c) Rate of growth/ increase in length of shoot tip/apex
    it is a region of (active) cell division/growth
(d) The seedling will be (dehydrated) /lose water (hence) wither/die/dry
Comments

Describe what happens to a meal rich in proteins along the alimentary canal from ingestion to egestion.

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2018PP2QN08

Describe what happens to a meal rich in proteins along the alimentary canal from ingestion to egestion.

Picture
answers
​The meal is ingested through the mouth; (In the mouth), it is chewed/masticated (by teeth); to reduce/break it into smaller particles; mixed with saliva (from salivary gland);
The food is then rolled (by the tongue) into boluses; and pushed down into the oesophaghus/swallowed; The boluses move by peristalsis (into the stomach);
Constant contractions/relaxations of the stomach walls mix the food, (giving rise to chime); Presence of food in the stomach further stimulates production of gastric juice; which contains pepsinogen; and rennin/chymosin; Pepsinogen is activated to pepsin; by hydrochloric acid; (contained in the gastric juice). Pepsin breaks down proteins to peptides;
Rennin converts/coagulates the protein, caseinogen; in milk to casein; (which is abundant in young children). It is then pushed into the duodenum (through the pyloric sphincter); Pancreatic juice in the duodenum contains trypsin; which digests proteins into peptides; (secreted in an inactive form, trypsinogen)
In the ileum, intestinal juice/Succus enfericus is secreted; It contains peptidase enzymes; which breaks down polypeptides into amino acids; It also contains polypeptidase enzyme; which breaks down peptides to amino acids,completing the process of digestion of the proteins;
The amino acids are absorbed into the bloodstream/pass through the epithelia of the villi, and the capillary walls into the blood-stream; by active transport;
The undigested/indigestible proteins/food substances pass through to the colon/large intestines; where water is absorbed; leaving a semi-solid waste material being passed on to the rectum; then out through the anus (as faeces);
Comments

Describe the role of hormones in the human menstrual cycle.

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2018PP2QN07

Describe the role of hormones in the human menstrual cycle.

Picture
answers
​After/at the onset of menstruation, (the anterior lobe of) the pituitary gland; secretes follicle stimulating hormone (FSH); the FSH causes the Graafian follicle; to develop into the ovary; and stimulate the ovary tissues to secrete oestrogen hormone; Oestrogen brings about repair/healing of the endometrium/uterine wall; its concentration increases to a level which stimulates the (anterior) pituitary gland; to secrete lutenizing hormone (L.H.) and stops further secretion of FSH;
The L.H. stimulates the maturation of the Graafian follicle; LH also stimulates the Graafian follicle to release an ovum into the (funnel of the) fallopian tube/causes ovulation; it also stimulates the remains of the Graafian follicle to form a yellow body/corpus luteum (in the ovary;
The corpus luteum is stimulated by the L.H. to produce progesterone; Progesterone then stimulates the thickening of the endometrium/inner lining of the uterine wall; in readiness for implantation; as progesterone level increases, it inhibits (the pituitary gland) from secreting FSH; further increase in progesterone level inhibits the pituitary gland from secreting L.H. This causes the corpus Luteum to degenerate; this reduces the amount of progesterone; the sudden drop in secretion of progesterone causes the endometrium to slough off/menstruation occurs; and the cycle is repeated;
Comments

Describe the mode of reproduction in a named fungus.

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2018PP2QN07

Describe the mode of reproduction in a named fungus.

Picture
answers
Rhizopus/mucor/mould; reproduce asexually; by sporulation; spores develop from a single cell forming sporangium; which bursts on maturity releasing spores; which are dispersed by air currents/wind germinating; to form new generation/ form a mycelium (if it lands on a suitable medium); Or
Yeast/Saccharomyces/Schizosaccharomyces; reproduce asexually;by budding; parent cell forms an outgrowth/projection/bud; this is followed by division of the nucleus into two; one of the nuclei moves into the bud; which grows and develops into a new cell;
Comments

K.C.S.E Biology Q & A - MODEL 2018PP2QN06

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2018PP2QN06

The effect of auxin concentration on growth response of two parts of a plant, X and Y was investigated over a period of time. The results were tabulated as shown in the table below.
Picture
(a) On the same axis, draw line graphs of the effect on growth of the two parts, X and Y (percentage inhibition or stimulation) against the concentration 
(b) With reasons, name the two parts of the plant, X and Y.
X 
Reason 
Y
Reason
(c) From the graph identify: .
(i) the point at which the percentage stimulation was the same for both X and Y. 
(ii) the optimum concentration of auxins required for part Y 
(d) State three ways in which the effects of auxins on plants is applied in flower farming.
(e) Distinguish between simple and conditioned reflex action 
answers
Picture
b) X—root; 
Reason
Low auxin concentration stimulates (rapid/faster) cell division and elongation/growth in roots;
High concentration of auxins inhibits growth in roots;
Y—shoot;
Reason
Low auxin concentration has little effect on the growth of shoots/shoots are stimulated to grow with high auxin concentration (up to a given optimum); 
c) i. 33%±2; 
ii. 1.0 parts per million; 
(d)Faster maturity of flowers/earlier flower formation/flowering;
Prunning/decapitating shoot tips to allow sprouting of lateral buds, hence more yield;
Keeping flowers fresh;
Stimulate formation/development of (adventitious) roots;
Comments

K.C.S.E Biology Q & A - MODEL 2018PP2QN05

1/7/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2018PP2QN05

The photograph below represents a plant in a Certain Division
Picture
​(a) (i) Name the Division to which the plant belongs. 
(ii) With reference to the Photograph, state three observable features of the Division named in a(i) above. 
(b) Name the part labelled N and P.
N
P
(c) Explain how the part labelled Q is adapted to its function 
answers
​a) i. Bryophyta;
ii. Has capsules (for enclosing spores);
Has (long) setae (for supporting the capsules/for effective propagation of spores); (Developed) rhizoids (for anchorage/absorption of water/mineral salts);
 Thalloid in nature/Thallus/undifferentiated;
b) N — Capsule;
     P—Seta;
(c)Numerous/hair-like to increase the surface area for absorption;/to enhance rate of absorption of water/nutrients/dissolved mineral salts;
Numerous/hair-like to hold firmly on the surface/not to be easily blown away/displaced/anchorage;
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K.C.S.E Biology Q & A - MODEL 2018PP2QN04

1/7/2020

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K.C.S.E Biology Q & A - MODEL 2018PP2QN04

The diagram below illustrates the arrangement of bones in a human arm.
Picture
​(a) Name:
(i) the type of joints formed at points H and M.
H
M
(ii) bone  G 
(b) Name bone J and state how it is adapted to its functions.
Name
Adaptation 
(c) State one functional difference between a tendon and a ligament.
answers
​a) i. H-Ball and socket (joint);
M - Gliding/planar/plane 
 ii. Clavicle;  
b) Scapula; 
Has a spine to increase surface area for muscle attachment;
It is broad/flat to increase the surface area for muscle attachment; 
Forms flexible attachment above the ribs that allows movement of the arms;
Has a glenoid cavity/depression for articulation with the humerus/forming the ball and socket joint;
Has acromion for articulation with clavicle/for muscle attachment;
Has coracoid process to increase surface area for muscle attachment;
c) Ligaments hold the bones together (at a joint) while tendons attach muscles to bones;
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Photo used under Creative Commons from Ben Taylor55
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