Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2008PP2QN02
A pea plant with round seeds was crossed with a pea plant that had Wrinkled seeds the gene for round seeds is dominant over that for wrinkled seeds
Using letter R to represent the dominant gene state: (a) The genotype of parents if plant with round seed was heterozygous (b) The gametes produced by the round and wrinkled seed parents
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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 2008PP1QN16
The diagram below represents a set up that was used to investigate certain process in a plant
(a) State the process that was being investigated
(b) State a factor that would affect the process
ANSWERS
(a) Photosynthesis
(b) Carbon (iv) Oxide/ Temp/ chlorophyll
K.C.S.E Biology Q & A - MODEL 2008PP1QN15
Explain what happens when there is oxygen debt in human muscles
ANSWER
K.C.S.E Biology Q & A - MODEL 2008PP1QN14
Describe the three characteristics of a population
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN13
State two characteristics of the image formed on the retina
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN13
Name the part of retina where image is formed
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN12
State two functions of the endoplasmic reticulum
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN11
Name three processes in the human body in which homeostasis is Involved
ANSWER
K.C.S.E Biology Q & A - MODEL 2008PP1QN11
What is homeostasis?
ANSWER
K.C.S.E Biology Q & A - MODEL 2008PP1QN10
State the adaptation that enables the red blood cells to move in blood Capillaries
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN10
Name the antigens that determine human blood groups
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN09
Give three factors that determine the amount of energy a human being require in a day
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN08
The diagram below shows a stage in mitosis in a plant cell
(a) Name the stage of mitosis
(b) Give two reasons for your answer in (a) above (c) Name the part of the plant from which the cell used in preparation was Obtained
ANSWERS
(a) Anaphase
(b) Chromatids fails to separate off poles Sister chromatids separate/ pair of chromatid separate (c) Root tip/ shoot/ cambium
K.C.S.E Biology Q & A - MODEL 2008PP1QN07
How does convergent evolution occur
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN07
what is fossil
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN06
Give two examples of continuous variation in humans
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN06
What is meant by non- disjunction?
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN05
(a) State two factors that affect enzymatic activities
(b) Explain how one of the factors stated in (a) above affects enzymatic Activities
ANSWERS
​(a) Temperature PH co- factors, co- enzymes; enzyme product concentration; substance concentration/ metabolic poison
(b) Temperature- increase in temperature increases rate of enzymatic activity upto an optimum/ low temperature increases enzymatic activity/ too high temp about optimum point denatures enzymes/ enzymatic activity occur at optimum temp. Ph- Enzymes work best at optimum ph/ or extreme for ph denatures enzymes. Enzyme con – Increase in con increase enzymatic activity occur at optimum temperature Co- enzymes – denatures enzymes increasing rate of activity Strate/ enzyme cone- increase in concentration increase enzymatic activity upto certain level. K.C.S.E Biology Q & A - MODEL 2008PP1QN04
The diagrams below show a red blood cell that was subjected to a certain Treatment
(a) Account for shape of the cell at the end of the experiment
(b) Draw a diagram to illustrate how a plant cell would appear if subjected to the same treatment K.C.S.E Biology Q & A - MODEL 2008PP1QN03
State the causative agent of:
(i) Cholera (ii) Candidiasis
ANSWERS
(i) Vibria chlerae
(ii) Canida/ candida albinism
K.C.S.E Biology Q & A - MODEL 2008PP1QN03
Name a disease of the liver whose symptom is jaundice
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN02
State the importance of the following processes that take place in the nephrons of a human kidney
(a) Ultra filtration (b) Selective reabsorption
ANSWERS
(a) To remove toxic/ harmful substances/ urea nitrogenous waste from the blood streams
(b) To return useful substances/ glucose and Amino acids loose into the Bloodstream. K.C.S.E Biology Q & A - MODEL 2008PP1QN01
Name the tissues in plants responsible for:
(a) Transport of water and mineral salts (b) Transport of carbohydrates (c) Primary growth
ANSWERS
(a) xylem
(b) Phloem (c) Apical meristems K.C.S.E Biology Q & A - MODEL 2007PP2QN05
In maize the gene for purple colour is dominant to the gene for white colour. A pure breeding maize plant with purple grains was crossed with a heterozygous plant.
(a) (i) Using letter G to represent the gene for purple colour, work out the genotype ratio of the offspring (ii) State the phenotype of the offspring |
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