Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2004PP1QN07
State the function of the organelles:
a) Lysosomes b) Golgi apparatus
answers
​a) Stores hydrolytic enzymes for destruction of worn out organelles / cells/ tissues / digestion of bacteria. / pathogens;
Acc. Digestion of food / accept autolysis. b) processing / packaging synthesized and transporting of packaged cell materials;. Production of lysosomes/ secretions of packaged material;
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K.C.S.E Biology Q & A - MODEL 2003PP1QN10
How are leaves of submerged adapted plants for photosynthesis?
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K.C.S.E Biology Q & A - MODEL 2003PP1QN11.
Name the causative agent of typhoid.
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K.C.S.E Biology Q & A - MODEL 2003PP1QN08
State a function of the large intestine in humans
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K.C.S.E Biology Q & A - MODEL 2003PP1QN04
What is the role of the bacteria named in (a) above?
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K.C.S.E Biology Q & A - MODEL 2003PP1QN04
Name the bacteria found in root nodules of leguminous plants.
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K.C.S.E Biology Q & A - MODEL 2003PP1QN02
Name the phylum whose members possess notochord
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K.C.S.E Biology Q & A - MODEL 2002PP1QN18
Two person X and Y drunk volumes of concentrated solution of glucose. The amount of glucose in their food was determined at intervals. The results are shown in the table below:
​a) On the grid provided, plot graphs of glucose level in blood against time on the same axes.
b) What was the concentration of glucose in the blood of X and Y at the 20th minute? X = 120 + -3) Y = 140 +-3) c) Suggest why the glucose level in person X stopped rising after 30 minutes while it continued rising in person Y. d) Account for the decrease in glucose level in person X after 30 minutes and person Y after 60 minutes (3 minutes) e) Name the compound that stores energy released during oxidation of glucose. f) Explain what happens to excess amino acids and development of plants.
answers
(a) – For exchanged axis award maximum 3 marks for points x identity
The scale must however be correct. For graphs on separate axis mark both and award the highest mark. (a) Axis = 2 (b) Scale = 1 (c) ( plotting) = 1 (d) curves) = 1 (b) X = 120 + -3) Y = 140 + -3 (c) Person X is capable of regulating glucose while person y is likely to be diabetic. X – Insulin (d) X insulin released, excess glucose is converted into glycogen ( in liver) must be mentioned if insulin is not mentioned Y Insulin not released, thus the decline is due to glucose being released in urine. (e) A.T.P / Adenosine triphosphate (f) Deaminated; resulting in formation of ammonia Ammonia combines with CO2 to form urea ( and H20); Urea is passed out in Urine carbohydrate group is oxidized/ stored as glycogen K.C.S.E Biology Q & A - MODEL 2002PP1QN12
The chart below represents a simplified carbon cycle.
​(a)Name the process labeled A, B, and C
A B C b) Name the organisms X and Y X Y c) State the importance of carbon cycle in nature
answers
​ a) A A photosynthesis
B Decomposition / decay C Respiration b) X Bacterial Y Fungi c) Regulate the CO2 in the atmosphere.
K.C.S.E Biology Q & A - MODEL 2002PP1QN10
What happens to excess fatty acids and glycerol in the body?
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K.C.S.E Biology Q & A - MODEL 2002PP1QN03
Give one example of a metallic co – factor
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K.C.S.E Biology Q & A - MODEL 2002PP1QN02b
Name the bacteria found in the root nodules of leguminous plant
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K.C.S.E Biology Q & A - MODEL 2002PP1QN02a
Name the bacteria found in the root nodules of leguminous plant
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K.C.S.E Biology Q & A - MODEL 2002PP1QN01
Beside the abdomen, name the other body part of members of Arachnida,
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K.C.S.E Biology Q & A - MODEL 2001PP1QN16
An experiment was carried out to investigate the nutritional value of two dry powder animals feeds X and Y over a period of six months. Twenty 5 month’s old castrated goats were use. The goats were divided into two equal groups A and B.
The animal’s in group A were fed on feed X throughout the experiment while those of group B were fed on feed Y. The feeds were supplemented with dry hay and water. The average body weight of each group of goats and the weight of the dry powder feeds were determined and recorded each month. The faeces produced by each group was dried and weighed and the average dry faecal output per month was also recorded. The results are as shown below.
(a) (i) What is the relationship between the amount of feed and the faecal output
(ii) Work out the average increase in weight for the animal’s in group A during The first four months The last two months (iii) Account for the average increase weight in goats in group A during the first four months The last two months (iv) Which of the two feeds is more nutritious? Give reason for your answer (b) State four uses of digested food in the bodies of animals (c) State four uses of water in the bodies of animals
answers
(a) (i) The more the feed the more the feacal output
The less the feed the less the faecal output (ii) The first four months
iii) Fast/ rapid/Active growth hence increase in weight
The last two months Slow growth, reached maturity iv) Feed X Give reason for your answer Group A gained (more) weight, on less food while group B lost weight on more food. b) growth, repair, protection, energy production c) a solvent, transport medium.. Hydrolyses of food, maintenance of temperature. K.C.S.E Biology Q & A - MODEL 2001PP1QN13
The diagram below represents the nitrogen cycle
(a) State the process labeled
A D (b) Name the compound represented by B (c) Name the group of organisms labeled C (d) (i) name the group of plants which promote process A (ii) State the part of the plant where process A takes place (e) How would excess pesticides in the soil interfere with process A
answers
​(a) A – Nitrogen fixation
D – absorption (b) Nitrate/ nitrates/ NO2 (c) Denitrifying bacteria/ Denitrifiers (d) (i) Leguminous plants, (acc. Legume/ acc examples e.g beans peas) (ii) Roots nodules; rej root or nodules alone; acc; root (e) – Killing / reducing of composers - Killing/reduction of nitrogen fixing bacteria/ nitrogen fixing microorganisms - Destruction of leguminous plants K.C.S.E Biology Q & A - MODEL 2001PP1QN12
The graph below shows the effect of substance concentration of the rate of enzyme reaction.
(a) (i) Account for the shape of the graph between A and B
(ii) B and C (b) How can the rate of reaction be increased after point B? (c) State two other factors that effect the rate of reaction of enzyme reaction
answers
(a) (i) More active sites of enzymes available, for a large number of molecules of substrate; hence increase in the rate of reaction ( rapid of fast increase in the rate of reaction)
(ii) B and C Enzymes/ substrate are in equilibrium / All active sites are occupied; hence rate of reaction is constant. (b) Raising concentration of enzymes (c) PH, temperature, inhibitors/ cofactors
K.C.S.E Biology Q & A - MODEL 2001PP1QN08a
The type of circulatory system found in members of the class insecta is
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K.C.S.E Biology Q & A - MODEL 2001PP1QN07
Name the organelle in which protein synthesis takes place
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K.C.S.E Biology Q & A - MODEL 2001PP1QN06
Adult elephants flap their ears twice as much as their calves in order to cool their bodies when it is hot. Explain.
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K.C.S.E Biology Q & A - MODEL 2001PP1QN05
State two functions of muscles found in the alimentary canal of mammals.
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K.C.S.E Biology Q & A - MODEL 2001PP1QN01
Other than having many features in common, state the other characteristics of a species
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K.C.S.E Biology Q & A - MODEL 2000PP1QN14
(a) Name the crop infested by phytophthora infestant and the disease it causes Crop / Disease
(b) State four control measures against the disease
answers
​(a) Crop
Potatoes / tomato Disease Tomato/potato bright/ Acc. Tomato rot (b) Use of fungicides Eradication of infected crop/ uprooting/ burning of infected plants Use biological control Use of disease resistant varieties Crop rotating
K.C.S.E Biology Q & A - MODEL 2000PP1QN07
Why is oxygen important in the process of active transport in cells?
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K.C.S.E Biology Q & A - MODEL 2000PP1QN05
State the importance of osmo-regulation in organisms
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