K.C.S.E Biology Q & A - MODEL 2013PP2QN02
The diagram below represents the human ear.
​(a) Name the parts labelled E, F and G.
E F. (b) How is each of the following adapted to its function? (i) External auditory meatus; (ii) Ear ossicles. (c) Name one defect of the human ear.
answers
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K.C.S.E Biology Q & A - MODEL 2013PP2QN01
The diagram below represents a plant in the division Bryophyta.
​(i) Name the parts labelled B and D.
B D (ii) State one function for each of the parts labelled A and C. A C (b) The diagram below represents a member of the kingdom Animalia.
​(i) Name the phylum to which the organism belongs.
(ii) Using observable features in the diagram, give three reasons for the answer in b(i).
answers
​(a) (i) B Seta/stalk;
D Rhizoid: (ii) A Production of spores/sporulation; C Photosynthesis; (b) (i) Arthropoda; (ii) Segmented body; Jointed appendages; Presence of exoskeleton
K.C.S.E Biology Q & A - MODEL 2013PP1QN01
What is meant by the term wilting?
answers
K.C.S.E Biology Q & A - MODEL 2012PP2QN05
Explain the mechanism of stomatal opening.
answers
The osmotic pressure of guard cells increase when sugar is manufactured during photosynthesis/starch is converted to sugar in low acidity/potassium moves into guard cells during the day; water enters guard cells from the surrounding cells by osmosis; because the guard cells are bean shaped with thin outer walls and thick inner walls, the thin outer walls expand faster as the cell becomes turgid; thus the thick inner wall curves; causing the stomatal aperture to open.
K.C.S.E Biology Q & A - MODEL 2012PP2QN05
Describe the process of inhalation.
answers
K.C.S.E Biology Q & A - MODEL 2012PP2QN04
The diagram below illustrates arrangement of bones and muscles of the human arm.
​(i) Name the bones labelled K and L.
K L (ii) Explain how the upward movement of the lower arm is brought about by the, bones and muscles shown in the diagram above. (b) State three ways in which support is brought about in a leaf.
answers
​(a) (i) K - ulna;
L - humerus; (ii) movement of the lower arm upwards takes place at the elbow/olecranon process which is between the ulna and the humerus; biceps/flexor muscles contract; while the triceps/extensor muscles relax; bringing about the movement of the lower arm upwards. , (b) The rigid midrib holds leaf out away from the stem; Profuse network of veins have lignified cells which support leaf to stay spread out; Turgidity in spongy mesophyll and palisade cells support the leaf to remain open; K.C.S.E Biology Q & A - MODEL 2012PP2QN02
The diagram below illustrates the structure of the kidney nephron.
(a) Name the part labelled E.
(b) How is the part labelled F adapted to its function? (c) State three physiological mechanisms of controlling the human body temperature during a cold day.
answers
K.C.S.E Biology Q & A - MODEL 2012PP2QN01
In a certain plant species which is normally green, a recessive gene for colour (n) causes the plants to be white in colour. Such plants die at an early age. In the heterozygous state, the plants are pale green in colour but grow to maturity.
(a) Give a reason for the early death of the plants with the homozygous recessive gene. (b) If a normal green plant was crossed with the pale green plant, what would be the genotype of the first filial generation (F1 generation)? Show your working. (c) If heterozygous plants were self-pollinated and the resulting seeds planted, work out the proportion of their offspring that would grow to maturity.
K.C.S.E Biology Q & A - MODEL 2012PP1QN18
Why are plants able to accumulate most of their waste products for long?
answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN17
Name two substances that leave the foetal blood through the placenta.
answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN16
The diagram below represents an experimental set-up used by students to investigate a certain process.
​Flower Q produced seeds while P did not. Account for the results.
answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN15
What name is given to a group of hormones that controls the development of secondary sexual characteristics in a human male?
answer
K.C.S.E Biology Q & A - MODEL 2012PP1QN14
Name the type of respiration that is most efficient.
b) Give a reason for your answer in (a) above
answer
a)Aerobic respiration;
b)It releases more energy per unit mass;
K.C.S.E Biology Q & A - MODEL 2012PP1QN13
State three factors that affect the rate of diffusion.
answers
Temperature; surface area; distance that particles have to travel; diffusion/concentration gradient; size/density of particles; surface area to volume ratio; thickness of membrane; medium of diffusion
K.C.S.E Biology Q & A - MODEL 2012PP1QN12
Why is it recommended to keep the stage of the microscope dry?
answers
Name the part of a light microscope used to bring an image of a specimen into sharp focus.26/6/2020
K.C.S.E Biology Q & A - MODEL 2012PP1QN12
Name the part of a light microscope used to bring an image of a specimen into sharp focus.
answer
K.C.S.E Biology Q & A - MODEL 2012PP1QN11
Name the muscles found in the following organs:
stomach; bone
answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN11
State two ways in which heart muscles are special.
answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN10
What is meant by the term irritability?
answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN09
State the importance of negative phototaxis to termites.
answer
What is the probability of a couple with blood group AB getting a child with blood group AB?26/6/2020
K.C.S.E Biology Q & A - MODEL 2012PP1QN08
What is the probability of a couple with blood group AB getting a child with blood group AB?K.C.S.E Biology Q & A - MODEL 2012PP1QN07
The diagram below represents a set-up that students used in an investigation.
​(a) Name the physiological process that was being investigated.
(b) State the role of potassium hydroxide in flask K. (c) Account for the observation in boiling tube L and flask N. L . N
answers
​(a) Respiration/aerobic respiration;
(b) Flask K Potassium hydroxide removes Carbon IV Oxide from atmospheric air; (c) L - Lime water remains clear because Carbon (IV) Oxide has been removed; Flask N lime water forms a white precipitate because the respiring cockroaches produce Carbon (IV) Ovide; K.C.S.E Biology Q & A - MODEL 2012PP1QN06
The diagram below represents part of the gaseous exchange system in human.
​(a) Name the parts labelled F and G.
F G (b) State one function of each of the parts labelled H and J. H J
answers
​(a) F - Bronchiole;
G - Intercostal muscles/external intercostal muscles; (b) H - (Pleural membranes) secretes encloses pleural fluid to lubricate lungs/protect lungs; J - (Diaphragm) separates chest cavity from abdominal cavity/works to effect volume and pressure changes in chest cavity necessary for inhalation and exhalation! Ventilation/breathmg; K.C.S.E Biology Q & A - MODEL 2012PP1QN05
The table below shows results of a study of three plants C, D and E growing in different habitats.
(a) Which one of the plants C, D and E grows in an area of relatively low water availability?
(b) Explain your answer in (i) above.
answers
​(a) Plant C;
(b) Thick cuticle reduces water loss; Low number of stomata reduces water loss; Large root-surface area enhances water absorption; K.C.S.E Biology Q & A - MODEL 2012PP1QN04
In an investigation, a student extracted three pieces of paw paw cylinders using a cork borer.
The cylinders were cut back to 50 mm length and placed in a beaker containing a solution. The results after 40 minutes were as shown in the table below.
​(a) Account for the results in the table above.
(b) What would be a suitable control set-up for the investigation?
answers
​(a) The solution was hypotonic/less concentrated compared to the cell sap of pawpaw cylinder cells;
The tissue/cells gained water by osmosis; becoming turgid/longer/stiff; (b) Pawpaw cylinders of the same size/length; placed in an isotonic solution; Boiled potato cylinders of the same size; placed in a similar solution; |
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