K.C.S.E Biology Q & A - MODEL 2002PP1QN17
State four advantages of vegetation propagation.
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K.C.S.E Biology Q & A - MODEL 2002PP1QN17
Give a reason for grafting in plants
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K.C.S.E Biology Q & A - MODEL 2002PP1QN17
What structures are produced by sisal for vegetative propagation?
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K.C.S.E Biology Q & A - MODEL 2002PP1QN15
Ascaris lumbricoides in an example for an endo – parasite
a) The name Ascaris refers to b) State the habitat of the organism c) State three ways in which the organism is adapted to living in its habitat.
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(a) Genus
(b) Ileum/ colon/ duodenum/ intestines/ of humans or intestines of pig (c) Lack of elaborate elementary canal ( simple guts) can tolerate raw corn Thick cuticle pellicle, reject the outer covering lays many eggs Mouthparts for sucking partly digested food K.C.S.E Biology Q & A - MODEL 2002PP1QN13
The chart below shows the number of chromosomes before and after cell division and fertilization in a mammal.
a) What type of cell division takes place at Z
b) Where in the body of a female does process Z occur c) On the chart, indicate the position of parents and gametes d) Name the process that leads to addition or loss of one or more chromosomes. e) State three benefits of polyploidy in plants to a farmer
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​a) Meiosis
b) Ovary c) parent must be the 2n top; any ‘n’ is a gamete d) Non – dysfunctions e) increased yields / highbred Vigor, Resistance decreases Resistance to drought. Explain why the carrying of wild animals is higher than that for cattle in a given piece of land.17/6/2020
K.C.S.E Biology Q & A - MODEL 2002PP1QN07​
Explain why the carrying of wild animals is higher than that for cattle in a given piece of land.
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K.C.S.E Biology Q & A - MODEL 2002PP1QN05
State two characters that researchers select in breeding programme.
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K.C.S.E Biology Q & A - MODEL 2002PP1QN04
During germination and early growth, the day weight of the endosperm decreases while that of the embryo increases. Explain.
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K.C.S.E Biology Q & A - MODEL 2001PP1QN18b
State the change that take place in a flower after fertilization
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K.C.S.E Biology Q & A - MODEL 2001PP1QN18a
Describe the process of fertilization in a flowering plant
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pollen grains stick in the stigma surfaces; that surface of stigma producers a chemical substance; which stimulates the pollen grain to produce a pollen tube / germinate. The pollen tube/ germinate. The pollen tube grows down (into the tissues of style) from where it derives nutrients; the generative nucleaus divides to give rise to two male nuclei and the antipodal cells; when pollen tubes disintegrates and make nucleus fuses with the egg cell and forms the zygote. The other male nucleus fuss with the two polar nuclei to form a triploid nucleus. The process involves double fertilization.
K.C.S.E Biology Q & A - MODEL 2001PP1QN09
Name three types of chromosomal mutations
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K.C.S.E Biology Q & A - MODEL 2001PP1QN04
Name the parts of the flower that are responsible the production of gametes
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K.C.S.E Biology Q & A - MODEL 2001PP1QN02
Why are green plants referred to as primary producers in an ecosystem?
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K.C.S.E Biology Q & A - MODEL 2000PP1QN19
How are leaves of mesophytes suited to their functions
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​Broad/ wide/ flat lamina provides large surface area for absorption of (O) and sunlight, thin to ensure short distance of CO2 reach photosynthesis/ palisade cells; presence of stomata guard cells for efficient diffusion of O2 gaseous exchange / H2O vapour transpiration/ CO2 into the leaf transparent cuticle epidermal cells; for light penetration into palisade cell which contains chloroplast next to upper epidermis; these receives maximum light for photosynthesis. Chloroplasts have chlorophyll, which traps light energy.
Leaves have vein, xylem and phloem to transport products of photosynthesis to other part of the plant. Air spaces on spongy mesopyll, easily circulates gases/ CO2 diffuse into palisade cells. Mosaic arrangements of leaves; enable leaves to trap sunlight.
K.C.S.E Biology Q & A - MODEL 2000PP1QN18
Describe the role of hormones in the human menstrual cycle
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​Inferior lobe of pituitary gland secretes F.S.H which causes grafian follicle develops in the ovary. It also stimulates ovary tissue/ ovary/ follicle walls secret estrogen which repairs, heals uterine wall, oestrogen stimulates inferior lobe of pituitary gland produce L.H. for ovulation. It also causes grafian follicle change into corpus interim L.H stimulates corpus luteum secret progesterone which causes proliferation of the uterine walls; in preparation of implantation; oestrogen/ progesterone inhibits the production of F.S.H ( by anterior lobe of pituitary) thus no more follicle develop; and oestrogen production reduces; 14 days later progesterone level rises inhibits production of L.H from anterior lobe of pituitary gland produce L.H for ovulation. It also causes grafian follicle change into corpus interim L.M stimulates corpus luteum secret progesterone which causes proliferation of the uterine walls in preparation of implantation; oestrogen/ progesterone inhibits the production of F.S.H ( by anterior lobe of pituitary) thus no more follicle develop; and oestrogen production reduces; 14 days later progesterone level rises inhibits production of L.H from anterior lobe of pituitary gland/ The corpus luteum stops secreting progesterone, and menstruation occur when the level of progesterone drops; ( anterior lobe of pituitary starts secreting F.S.H again.
K.C.S.E Biology Q & A - MODEL 2000PP1QN17
The numbers of different types of animals supported by a square kilometer in two terrestrial ecosystems are shown in the table below
(a) (i) Which domestic animal is better adapted to both ecosystems?
(ii) Give a reason why the animal named in (a) (i) above is better adapted to the two ecosystems. (b) Why are cattle and sheep fewer in the bush land than in the savannah? (c) (i) Name suitable methods that were used to estimate the population of: Domestic animals Wild animals (ii) Give a reason why the method named for wild animals in (c) (i) above is suitable (d) state three methods which could be used to determine the diet of wild animals in an ecosystem (e) Name four biotic factors that could have regulated the animal population in both ecosystems (f) State four human activities that affect population of animals in game parks (g) What is the importance of national park to a nation?
answers
​(a) (i) Goat
(ii) It is a grazer and a browser (b) Insufficient grass in bush/ aren’t adapted to eating twigs/ not browsers/ are grazers (c) (i) Domestic animals - total counts Wild animals – total counts; aerial counts/ quadrat/ Belt transect/ capture/ recapture (ii) Analyzing gut counts, studying dentition/ breaks/ claws/ parts (d) Observation Examine droppings Dissecting a sample of animals/ study structure/ nature of digestive System/ size of caecum/ length of intestine/ chamber (e) Irrigation Competition; diseases Predation; human activity/ man accept any correct Parasitism (f) Poaching, cropping/ culling/ licensed spot hunting (g) Pollution; translocation Burning trees, charcoal- deforestation
K.C.S.E Biology Q & A - MODEL 2000PP1QN16b
State three advantages of asexual reproduction
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K.C.S.E Biology Q & A - MODEL 2000PP1QN16a
What is the significance of sexual reproduction?
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K.C.S.E Biology Q & A - MODEL 2000PP1QN10
Explain how birds of prey are adapted to obtaining their food.
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K.C.S.E Biology Q & A - MODEL 2000PP1QN02
Give a reason why two species in ecosystems cannot occupy the same niche.
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K.C.S.E Biology Q & A - MODEL 1999PP1QN17
Explain how the various activities of man have caused pollution of air.
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K.C.S.E Biology Q & A - MODEL 1999PP1QN13b
Describe how population of grasshoppers in a given area can be estimated.
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​Use the capture and recapture methods; Catch the grasshoppers count and mark using permanent ink; record and release; and allow time 1 to 2 hours; recapture and count the marked and the unmarked; total population is equal to the number of marked and unmarked grasshoppers in the second sample multiplied by number marked grasshoppers in the first sample; divided by the number of grasshoppers marked in the second sample that were recaptured.
K.C.S.E Biology Q & A - MODEL 1999PP1QN13a
Distinguish between a community and population.
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K.C.S.E Biology Q & A - MODEL 1999PP1QN08
State two disadvantages of self-pollination.
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State three ways by which plants compensate for lack of ability to move from one place to another.15/6/2020
K.C.S.E Biology Q & A - MODEL 1999PP1QN06
State three ways by which plants compensate for lack of ability to move from one place to another.
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