K.C.S.E Biology Q & A - MODEL 2013PP1QN04
Explain how age determines a person’s energy requirements.
answers
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K.C.S.E Biology Q & A - MODEL 2013PP1QN04
State two roles of mucus in the stomach.
answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN29
Name two nutrients that are absorbed without being digested by enzymes in humans.
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K.C.S.E Biology Q & A - MODEL 2012PP1QN01
How does nutrition as a characteristic of living organisms differ in plants and animals?
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K.C.S.E Biology Q & A - MODEL 2011PP1QN18
State two functions of saliva.
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K.C.S.E Biology Q & A - MODEL 2011PP1QN17
The diagram below represents part of the human digestive system.
(a) Name the organs labelled L and M.
L M . (b) (i) Name the substance produced by the organ labelled K. (ii) State the function of the substance named in b(i) above.
answers
​.(a) L - Duodenum;
M - Pancreas; (b) (i) Bile; (ii) Emulsification/emulsifies fats; (iii) Provides alkalinic medium for enzyme action. (iv) Neutralizes acidic chyme.
K.C.S.E Biology Q & A - MODEL 2011PP1QN13
State two functions of carbohydrates in the human body.
answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN02
Name two dental diseases.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN17
The following is the dental formula of a certain mammal:
(a) State the likely mode of feeding for the mammal.
(b) Give a reason for your answer in (a) above.
answers
(a) Herbivorous;
(b) Lack canines on upper Jaw/lack incisors on upper jaws;
K.C.S.E Biology Q & A - MODEL 2010PP1QN16
What is the role of bile salts in digestion in humans?
answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN02
Name the substance that is responsible for hardening of teeth
answer
K.C.S.E Biology Q & A - MODEL 2009PP2QN02
The diagram below represents the lower jaw of a mammal
(a) Name the mode of nutrition of the mammal whose jaw is shown
(b) State one structural and one functional difference between the teeth labeled J and L Structural Functional (c) (i) name the toothless gap labeled K.
answers
(a) Herbivorous Rej Herbivore Acc Herbivory
(b) Tooth J is narrow/ sharp/ chisel like while tooth L is broad/ ridged J has one root while L has 2/3/4 roots Functional Tooth J is used for cutting while tooth L is used for grinding cutting for biting) (c) (i) Diastema (ii) For manipulation of blood by tongue
K.C.S.E Biology Q & A - MODEL 2009PP1QN23
state the function of iron in the human body
answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN22
Explain how the carnassials teeth of a dog are adapted to their function
answer
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 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 2007PP1QN25
Name the features that increase the surface area of small intestines
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN25
State a factor that denatures enzymes
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN25
The action of ptyalin stops at the stomach. Explain
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN08
State two functions of potassium in the human body
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN08
Name a fat soluble vitamin manufactured by the human body
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN07
The diagram below represents a section though a human tooth
​(a) (i) Name the type of tooth shown
(ii) Give a reason for your answer in (a) (i) above (b) State the functions of the structures found in part labeled J
ANSWERS
(a) (i) Pre- molar tooth
(ii) presence of two roots (iii)Presence of cusps of the crown (b) Has nerve cells that increase sensitivity of the tooth to heat and pain Has a blood vessel that provides nourishment to the tooth and remove waste products
K.C.S.E Biology Q & A - MODEL 2006PP1QN18
How does substrate concentration affect the rate of enzyme action?
answer
K.C.S.E Biology Q & A - MODEL 2006PP1QN18
State two functions of bile juice in the digestion of food.
answers
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