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.
(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