Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN13
What is meant by the following terms?
(a) Habitat; (b) Ecosystem.
answers
(a) Place or environment in which specified organisms live;
(b) A natural unit with abiotic and biotic factors;
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K.C.S.E Biology Q & A - MODEL 2010PP1QN10
State two advantages of hybrid vigour.
answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN07
How are flowers adapted to wind and insect pollination?
answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN03
Name a substance that is responsible for acid rain
answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN03
What are the effects of eutrophication
answers
​( Proliferation of plants) block light from reaching plants underneath which will not photosynthesize the plants die and decompose leading to lack/ depletion of O2; animals also die/ suffocate.
K.C.S.E Biology Q & A - MODEL 2009PP2QN03
What is eutrophication?
answer
K.C.S.E Biology Q & A - MODEL 2009PP1QN20
Other than using the quadratic, give two methods of estimating population of grass
answers
Name one process that is responsible for loss of energy from one trophic level to the next23/6/2020
K.C.S.E Biology Q & A - MODEL 2009PP1QN19
Name one process that is responsible for loss of energy from one trophic level to the next
answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN19
State three effects of dumping untreated sewage into a river
answers
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 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 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 2009PP1QN02
Name two befits that a parasite derives from the host
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP2QN07
Describe the nitrogen cycle
answers
​During thunderstorm/ lightning; nitrogen gas combines with O2 to form nitrogen oxides; nitrogen oxides dissolve in water to for nitric acid; acid is deposited in the soil by rain, nitric acid combines with chemical substance to form nitrates/ nitric acids dissolves to form nitrates which are absorbed by plants symbiotic bacteria/ such as rhizobium; which are found in root nodules of leguminous plants, fix free nitrogen to nitrates.
Free living bacteria/ clatridium/ azotobacteria fix nitrogen to all rates Nostoc algae/ chlorella/ anaemia/ ix nitrogen to nitrates. Plants use Nitrates to form plant proteins Animals feed on plants and convert plant proteins into animal proteins Plants/ animals die and decomposed by bacteria/ saprophytes/ fungi decomposing plants/ animals/ release ammonia which is covered to nitrates/ by nitrosomomes nitrococcus bacteria Nitrates are converted to nitrates; by nitrobacteria Nitrates in the soil can be converted to free nitrogen/ denitrification by some fungi; pseudomonas/ hulobacillus denitrifying bacteria. K.C.S.E Biology Q & A - MODEL 2008PP2QN01
The figure shows changes that take place during menstrual cycle in human
(a) Name the hormone whose concentrations are represented by curves F and G
(b) State the effects of the hormones named in (a) above on the lining of the uterus (c) (i) Name the hormone which is released by the pituitary gland in high concentration on the 14th day of the menstrual cycle (ii) State two functions of the hormone named in (c) (I ) above (d) State the fertile period during the menstrual cycle
answers
(a) Oestrogen
Progesterone (b) Promotes healing (promotes repair (of the uterus) Causes thickening (of the uterine lining) vasculation (c) (i) Leutinizing hormone (ii) Causes ovulation Induces graafian follicle to become corpus iterum Stimulates corpus inteum to release progesterone (d) 12th , 16th , 14 + 2
K.C.S.E Biology Q & A - MODEL 2008PP1QN29
State a function of amniotic fluid.
answer
K.C.S.E Biology Q & A - MODEL 2008PP1QN28
Distinguish between protandry and protogyny.
answers
K.C.S.E Biology Q & A - MODEL 2008PP1QN28
State the mode of asexual reproduction in yeast.
answer
K.C.S.E Biology Q & A - MODEL 2008PP1QN21
What is seed dormancy
ANSWER
K.C.S.E Biology Q & A - MODEL 2008PP1QN17
Account for the following phases of a sigmoid curve of a growth of an organism
(a) Lag phase (b) Plateau phase
ANSWERS
(a) Few dividing cells/ cells not adjusted to surrounding environment
(b) Most cells fully differentiated/ rate of cell division equals rate of cells dying |
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