K.C.S.E Biology Q & A - MODEL 2017PP1QN11
The set up below illustrates a certain physiological process.
​(a) (i) Name the physiological process.
(ii) Give two examples of the process named in (a) (i) above in plants. (b) State two ways by which the movement of dye molecules in the set up would be slowed down.
answers
​a i) Diffusion;
ii) Gaseous exchange/excretion of carbon (IV) oxide and oxygen; Translocation of materials; Absorption/uptake of mineral ions/salts; b. Lowering the temperature of the medium; Increasing thickness of the membrane; Use less dye/add more water/reducing the concentration gradient;
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K.C.S.E Biology Q & A - MODEL 2017PP1QN10
State two structural adaptations of leaves that maximize efficiency in gaseous exchange
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN10
State the effect of movement of the diaphragm muscles during inhalation in mammals.
answers
Give one reason why the coarse adjustment knob should not be used to lower the high power objective.30/6/2020
K.C.S.E Biology Q & A - MODEL 2017PP1QN09
Give one reason why the coarse adjustment knob should not be used to lower the high power objective.
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN09
State the function of a mirror in a light microscope.
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN08
Explain why short distance runners breathe quickly and deeply at the end of a race.
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN07
The diagram below represents a stage in the division of a cell.
​With a reason, identify the organism from which the cell was obtained.
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN06
Name two enzymes in the human digestive system which are secreted in an inactive form.
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN05
The photograph illustrates a housefly at various stages of its development.
​(a) (i) On the photograph, name the stages of the life cycle.
(ii) Using arrows, link the stages of the life cycle in the correct order. (b) (i) State two differences between the life cycles of a housefly and that of a cockroach. (ii) State one advantage of the life cycle of a cockroach to itself. K.C.S.E Biology Q & A - MODEL 2017PP1QN04
In an experiment on respiration, a mouse was observed to have inhaled 200 cm3 of oxygen and exhaled 199.75 cm3 of carbon(IV) oxide in ten minutes.
​(a) Calculate the respiratory quotient for the activity in the experiment.
(b) Identify the possible food substance consumed by the mouse. (c) State the fate of the excess food named in (b) above in the human body. K.C.S.E Biology Q & A - MODEL 2017PP1QN03
During a practical investigation on food tests, students were provided with the following reagents.
Benedict’s solution Sodium hydrogen carbonate Dilute hydrochloric acid.
​(a)Identify the food substance the students were to test.
(b) State the role of dilute hydrochloric acid and sodium hydrogen carbonate during the experiment. (i) Dilute hydrochloric acid (ii) Sodium hydrogen carbonate
answers
​a) Non reducing sugar;
b) (i) Hydrolyze/break down sucrose! non reducing sugars to reducing sugars/glucose/fructose; (ii) neutralize the acid; K.C.S.E Biology Q & A - MODEL 2017PP1QN02
Below are diagrams of a cell organelle obtained from different organs of an animal
​(a) (i) For each organelle state an organ in the urinary system where it is likely to be found.
F G (ii) Give a reason for your answers in (a) (i) on page 2. (b) Name the part of the chloroplast where the following reactions occur: (i) Carbon(IV) oxide fixation (ii) Photolysis
answers
(a) (i) F - Kidney;
G - Bladder/Ureter/Urethra; ii) Kidney - active re-absorption of solutes requires more energy; organelle F has more cristae for attachment of more respiratory enzymes producing more energy; Bladder/ureter/urethra does not require as much energy/organelle G has less number of cristae hence fewer respiratory enzymes attached/less energy produced; (b) i) Stroma; ii) Grana/granurn; K.C.S.E Biology Q & A - MODEL 2017PP1QN01
Below is an illustration of a piece of apparatus strategically positioned to trap some organisms.
​(a) Name the apparatus.
(b) State the function of the part labelled E.
answers
​a) Pooter/Aspirator;
b) To prevent dirt/insects from entering the suction tube/into the mouth; |
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