Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2008PP2QN04
Why is movement necessary in animals
answers
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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
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
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 2008PP1QN27
Explain how anaerobic respiration is applied in sewage treatment.
answers
K.C.S.E Biology Q & A - MODEL 2008PP1QN26
State one use of each of the following excretory products of plants:
(a) colchicine; (b)pawpaw
answers
(a) Inducing polyploidy/ treatment
(b) Meat tenderizer K.C.S.E Biology Q & A - MODEL 2008PP1QN30
The diagram below shows two fused bones of a mammal
(a) Identify the fused bone
(b) Name the (i) Bone that articulates at the point labelled F (ii) The hole labelled G
ANSWERS
(a)Pelvic girdle
(b) (i) Femur (ii) Obturatar foramen. K.C.S.E Biology Q & A - MODEL 2008PP1QN25
Giving a reason in each case, name the class to w which each of the following organisms
Bean plant Reason Bat Reason
ANSWERS
Bean plant - Dicotyledonae
Reason Leaves have net veined; two cotyledon; tap root system; xylem with phloem in between the arms Bat Flying mammal Reason Have sweat glands; 3 ear ossicle; presence of fur; mammaring glands K.C.S.E Biology Q & A - MODEL 2008PP1QN24
Name the sites where light and dark reactions of photosynthesis take place
Light reaction Dark reaction
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN23
The diagram below shows a human tooth
(a) Identify the tooth
(b) How is the tooth adapted to its function (c) State the role of the following vitamins in the human body (i) C (ii) K
ANSWERS
(a) Canine
(b) Pointed/ sharp for piercing/ tearing/ cutting food (c) (i) C- Absorption of lien/ prevent scurvy/ quick healing of wounds/ best immunity/ ant oxidants/ prevents anaemia/ formation of connective tissues/ ​ K – blood clothing
K.C.S.E Biology Q & A - MODEL 2008PP1QN21
What is seed dormancy
ANSWER
​K.C.S.E Biology Q & A - MODEL 2008PP1QN20
Name the opening to the chamber of the heart of an insect
ANSWER
K.C.S.E Biology Q & A - MODEL 2008PP1QN20
Name an organism which has single circulatory system
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN20
what is a single circulatory system
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN19
The diagram below represents a tissue obtained from an animal
(a) Identify the tissue
(b) State the functions of the tissue named ( a) above
ANSWERS
(a) Cardiac muscle
(b) Contraction of the heart
K.C.S.E Biology Q & A - MODEL 2008PP1QN18
How is the epidermis of a leaf of a green plant adapted to its function
ANSWERS
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 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 |
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