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K.C.S.E Biology Q & A - MODEL 2015PP1QN16
State four structural differences between millipedes and centipedes.
answers
Millipedes Centipedes
Cylindrical body Dorso - ventrally flattened Head has two clumps of many simple eyes Head has a pair of simple eyes Each segment has two pairs of walking Each segment has a pair of waking legs legs (except the first thoracic segment) Head has a pair of short antennae; Head has a pair of long antennae. No poison claws Has poison claws Three body parts - head short, throrax, Two body parts - head and trunk and trunk Has anterior genital aperture Has aposterior genital aperture Has 9 - 100 segments Has 15 - 21 segments  K.C.S.E Biology Q & A - MODEL 2015PP1QN15
The photomicrographs below show the various stages of cell division in a certain plant.
​(a) (i) Name the type of cell division illustrated.
(ii) Give a reason for your answer in (a) (i) above. (b) (i) Name the stage of cell division labelled K. (ii) Give a reason for your answer in (b) (i) above.
answers
​(a) (i) Mitosis;
(ii) Formation of two daughter cells. (b) (i) Metaphase; (ii) Chromosomes are at the equator
K.C.S.E Biology Q & A - MODEL 2015PP1QN14
Name two types of involuntary muscles in mammals.
b)State the location of each of the muscles named in (a) above.
answers
Cardiac muscles - heart
K.C.S.E Biology Q & A - MODEL 2015PP1QN13
State three differences between the end products of mitosis and meiosis.
answers
K.C.S.E Biology Q & A - MODEL 2015PP1QN12
​(a) What is meant by each of the following:
(i) pyramid of biomass? (ii) pyramid of numbers’? (b) During an ecological visit to the Savanna Grassland, students were able to see lions, antelopes, vultures and pastoralists grazing their cattle. Construct a food chain with four consumer levels to illustrate the energy flow in the ecosystem.
answers
(a) (i) Pyramid of biomas represents total dry mass weight of organisms in each trophic level;
(ii) While pyramid of numbers represents the total number of organisms at each trophic level/feeding levels/nutrition levels; 
K.C.S.E Biology Q & A - MODEL 2015PP1QN11
Name two structures used for gaseous exchange in plants.
answers
K.C.S.E Biology Q & A - MODEL 2015PP1QN10
The diagram below illustrates the skulls of adult human and chimpanzee.
​(a) State one difference between the two skulls in the following structures:
​(b) State the significance of the evolution observed on the parietal bone in the chimpanzee and human skulls.
answers
(b) Accommodate large sized brain in humans;
K.C.S.E Biology Q & A - MODEL 2015PP1QN09
The diagram below shows an experimental set up to investigate a certain physiological process in plants.
​(a) State the aim of the experiment.
(b) State the role of the following in the experiment: (i) potassium hydroxide; (ii) aluminum foil. (c) Account for the expected colour change in tube F.
answers
​(a) To show that carbon (TV) oxide is produced during respiration in plants;
(b) (i) Absorb carbon (IV) oxide from the (incoming) air; (ii) Exclude light / to prevent photosynthesis; (c) No colour change in tube F / no observable colour change. Carbon (IV) oxide removed/absorbed from air by potassium hydroxide.
K.C.S.E Biology Q & A - MODEL 2015PP1QN08
State two control measures for malaria.
answers
K.C.S.E Biology Q & A - MODEL 2015PP1QN08
Name the organism that:
(î) causes malaria; (ii) transmits malaria.
answers
​(i) Plasmodium spp/malariae, vivax, Ovale, falseparum;
(ii) Anopheles female mosquito;
K.C.S.E Biology Q & A - MODEL 2015PP1QN07
How is a guard cell structurally adapted for gaseous exchange?
answers
K.C.S.E Biology Q & A - MODEL 2015PP1QN06
Students set up an experiment as illustrated below.
​(a) Name the physiological process that resulted in the observations made after 30 minutes.
(b) State the importance of the physiological process investigated in plants. (c) Explain the observations made after 30 minutes.
answers
​(a) Osmosis;
(b) Absorption of water from the soil; opening and closing of stoma; feeding in insectivorous plants; support (in seedlings, leaves,herbaceous plants); Movement of water from cell to cell in plants. (c) The thistle funnel gained water by osmosis; because the sucrose solution was hypertonic;
K.C.S.E Biology Q & A - MODEL 2015PP1QN05
How is the low power objective lens manipulated to focus a specimen for observation under a light microscope?
answers
K.C.S.E Biology Q & A - MODEL 2015PP1QN05
State two advantages of using a coverslip when preparing a specimen for observation under a light microscope.
answers
​(i) To hold the specimen in place;
(ii) Protects specimen from dehydration/drying up/dust particles; (iii)Protect objective lens from staining. K.C.S.E Biology Q & A - MODEL 2015PP1QN04
Colour blindness is a sex linked trait controlled by a recessive gene b. If a mother is a carrier and the father is normal, what is the chance that their son will be colour blind? Show your working.
answers
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