Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN13
Distinguish between diffusion and active transport
ANSWER
In diffusion molecules move from a highly conc. Region to a lowly conc. Region while in active transport molecules move from a lowly concentration region to a highly concentration region; on diffusion molecules move along conc. gradient while in active transport molecules move against conc. gradient. No energy is required in diffusion while energy is required in active transport/ active requires carrier molecules while carrier molecule not required in diffusion;
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K.C.S.E Biology Q & A - MODEL 2009PP1QN12
The diagram below represents a bone obtained from a mammal
​(a) Name the bone
(b) Name the: (i) Bone which articulate with the bone named in (a) above at the cavity labeled K; (ii) Joint formed by the two bones (c) State the function of the part labeled J
ANSWERS
(a) scapula;
(b) (i) Humerus (ii) Ball and socket joint (c) Attachment of muscles K.C.S.E Biology Q & A - MODEL 2009PP1QN11
In an experiment the shoot tip of a young tomato plant was decapitated as shown in the diagram below
​(a) State the expected results after 2 weeks
(b) Give a reason for your answer in (a) above
ANSWERS
(a) auxiliary/ lateral buds spront/ bronches will be formed
(b) Decapitation removes the hormone/ ouxins /IAA which is produced in the terminal bud/ the stem tip; abseul/ removal of the hormone/ auxins/ IAA promote branch/ development of auxiliary lateral buds.
K.C.S.E Biology Q & A - MODEL 2009PP1QN10
Explain why certain drugs become ineffective in curing a disease after many years of use.
ANSWER
K.C.S.E Biology Q & A - MODEL 2009PP1QN10
Give an example of a vestigial structure in human
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN09
Name the disease in humans caused by plasmodium falciparum
ANSWER
K.C.S.E Biology Q & A - MODEL 2009PP1QN09
Name the causative agents of the following diseases in humans
(i) Typhoid (ii) Amoebic dysentery
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN08
What is the role of the testes in the mammalian reproductive systems?
ANSWERS
Pregnancies continues if the ovary of an expectant mother is removed after 4 months explain23/6/2020
K.C.S.E Biology Q & A - MODEL 2009PP1QN08
Pregnancies continues if the ovary of an expectant mother is removed after 4 months explain
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN07
State the function of the following cell organelles
(a) Ribosome (b) Lysosomes
ANSWERS
​(a) site for protein synthesis
(b) Break down worn out cells/ organelles / food materials K.C.S.E Biology Q & A - MODEL 2009PP1QN06
The diagram below shows a section through a plant organ
(a) (i) Name the class of the plant which the section was obtained
(ii) Give a reason for your answer in (a) (i) above (b) State the functions of the part labeled F
ANSWERS
(a) (i) Dicotyledonous; Rej: Dicotyledonous
(ii) Vascular bundles arranged in a ring / presence of vascular (b) (Divides to) give rise to secondary thickening (growth/ increase in growth/ diameter/ width of stem/ gives rise to new/ additional xylem and phloem tissues
K.C.S.E Biology Q & A - MODEL 2009PP1QN05
State two causes of chromosomal mutations
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN05
What is meant by the following terms
(i) Hybrid vigour (ii) Polyploidy?
ANSWERS
(i) production of plants and animals that have superior/ greater productivity/ have beneficial/ characteristics than either of their parents.
(ii) Condition in which an individual has more than two sets of chromosomes K.C.S.E Biology Q & A - MODEL 2009PP1QN04
​The diagram below represents a stage during germination of a seed
​(i) Name the type of germination illustrated in the diagram
(ii) State the role of the part labeled x during germination of the seed
ANSWERS
(i) Epigeal
(ii) Protection of the delicate plumule; pulls the cotyledons above the ground
K.C.S.E Biology Q & A - MODEL 2009PP1QN04
The state during which a seed cannot germinate even when conditions for Germination are suitable is called
ANSWER
K.C.S.E Biology Q & A - MODEL 2009PP1QN03
State the functions of the following parts of a light microscope
(a) Objective lens (b) Diaphragm
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN02
Name two befits that a parasite derives from the host
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN01
State two characteristics of fungi
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN01
Name the external feature which is common in birds, fish and reptiles
answer
K.C.S.E Biology Q & A - MODEL 2008PP2QN05
A freshly obtained dandelion stem measuring 5 cm long was split lengthwise to obtain two similar pieces The pieces were placed in solutions of different concentrations in Petri dishes for 20 minutes.
The appearance after 20 minutes is as shown
​(a) Account for the appearance of the pieces in solutions L1 and L2
(b) State the significance of the biological process involved in the experiment
answers
​(a) L1
Inner cells gained water by Osmosis; hence increased in length; epidermal cells did not gain water because they are covered by a water proof cuticle leading to currature. L2 Inner cells lost water by osmosis; leading to (flaccidity) decrease in length; epidermal cells did not lose water due to waterproof leading to currature (b) Support in (herbaceous) plants Absorption of water Opening and closing of stomata Movement of water from cell to cell Leading in infectious plants Folding of leaves in the Mimosa
K.C.S.E Biology Q & A - MODEL 2008PP2QN04
Why is movement necessary in animals
answers
K.C.S.E Biology Q & A - MODEL 2008PP2QN04
Give three reasons in each case why support is necessary in
(i) Plants (ii) animals
answers
(i) Plants
K.C.S.E Biology Q & A - MODEL 2008PP2QN03
The equation below represents a process that takes place in plants
6CO2 + 6H2O→C6H12O6 + 602 (a) Name the process (b) State two conditions necessary for the process to take place (c) State what happens to the end- products of the process
answers
(a) Photosynthesis
(b) Light (energy) Chlorophyll (c) Oxygen – used in respiration, oxidation Released into the atmosphere Glucose – used in respiration Converted to sucrose or starch for storage Used in formation of sturdiness allulose cell wall/ cytoplasm
K.C.S.E Biology Q & A - MODEL 2008PP2QN02
What is a test – cross?
answers
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