K.C.S.E Biology Q & A - MODEL 2001PP1QN11
The diagram below represents a mammalian nephron
(a) Name the
(i) Structure labeled P (ii) Portion of the nephron between point X and Y (b) Name the process that takes place at point Q (c) Name one substance present at point R but absent at point S in a healthy mammal (d) The appearance of the substance you have mentioned in (c) above is a symptom of a certain disease caused by a hormone deficiency. Name the (i) Disease (ii) Hormone (e) State the structural modifications of nephrons found in the desert mammals
answers
(a) (i) Efferent arteriole/ vessels
(ii) Loop of henle (b) Ultra – filtration ( acc. Pressure filtration) rej. Filtration (c) Glucose ( acc. Blood sugar) (d) (i) Disease – diabetes mellitus ( acc. Sugar diabetes) (ii) Hormone – insulin (e) Small Bowman’s Capsule/ Groleruli`; Rej few Bowman’s capsule Loop of Henle
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K.C.S.E Biology Q & A - MODEL 2001PP1QN08a
The type of circulatory system found in members of the class insecta is
ANSWERS
K.C.S.E Biology Q & A - MODEL 2000PP1QN15
The concentration of the lactic acid in blood during and after an exercise was determined. The results are shown in the graph below
(a) (i) By how much did the lactic acid increase at the end of 13 minutes?
(ii) After how many minutes was the lactic acid concentration 71mg/100cm3? (iii) What would be the concentration of lactic acid at the 60th minute? (b) Give a reason for the high rate of production of lactic acid during the Exercise (c) Give a reason for the decrease in the concentration of lactic acid after the exercise
answers
​(a) (i) 78/78 mg/ 100cm3
(ii) 8.5th and 29.5th / 8min 30 sec and 29 min 30 sec (iii) 47 mg/100cc; Acc. 47 (b) The demand for oxygen is more than the supply leading to anaerobic respiration. Acc. Lactic acid converted to glucose/Glycogen (c) Lactic acid is oxidized ( to form CO2 and H2O) Acc. Lactic acid is converted to glucose/ glycogen K.C.S.E Biology Q & A - MODEL 2000PP1QN13
The temperature of a person was taken before, during and after taking a cold bath. The results are shown in the graph below
(a) Explain why the temperature fell during bath
(b) What changes occurred in the skin that enabled the body temperature to return to normal?
answers
​(a) Heat loss by conduction/ convection from the blood vessels
The body skin to the cold water, the cooler blood leaving skin enters general circulation cooling the whole body. (b) Vasoconstriction; thus less blood flowing to the skin reducing heat loss. Sweating eases heat produced through metabolism Accept shivering producing heat
K.C.S.E Biology Q & A - MODEL 2000PP1QN09
State two advantages of metamorphosis to the life of insects.
answers
K.C.S.E Biology Q & A - MODEL 1999PP1QN11
Give reasons for each of the following:
a) Constant body temperature is maintained in mammals. b) Low blood sugar level is harmful to the body.
answers
​a) Most enzymes in the body function within a narrow range of temperature;
High temperature denature enzymes Low temperature inactive /inhabit enzymes b) Sugar in a raw material for respiration, hence less energy, available to body/low/rate of metabolism.
K.C.S.E Biology Q & A - MODEL 1998PP1QN01
Why are people with blood group O universal donors?
ANSWERS
K.C.S.E Biology Q & A - MODEL 1997PP1QN15
The equation below represent a metabolic that occurs in the mammalian live Amino acids →Organic compounds + urea
​(a) Name the process.
(b) What is the importance of the process to the mammal? (c) What is the source of amino acids in this process (d) What is the difference between essential and nonessential amino acids?
ANSWERS
​(a) Deamination
(b) Removal of excess amino acids availing energy in the body formation glycogen/ fat for storage. (c) Proteins (d) Essentials amino acids are acquired from food Non- essential are synthesized in the body K.C.S.E Biology Q & A - MODEL 1997PP1QN08
A person was found to pass out large volumes of dilute urine frequently.
Name the (a) Disease the person was suffering from (b) Hormone that was deficient
ANSWERS
​(a) Disease the person was suffering from
Diabetes inspidus ref. Diuresis/ water diabetes (b) Hormone that was deficient Antidiuretic hormone/ ADH/Vasopressin |
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