Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2006PP1QN17
A certain animal has no incisors, no canines, 6 premolars and 6 Molars in its upper jaw. In the lower jaw there are 6 incisors, 2 canines, 6 Premolars and six molars. Write its dental formula.
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K.C.S.E Biology Q & A - MODEL 2006PP1QN17
What is the function of carnassials teeth?
answer
K.C.S.E Biology Q & A - MODEL 2006PP1QN17
Distinguish between the terms homodont and heterodont.
answers
​Homodont – having same kind/ type/ similar teeth.while Heterodont – having different type kind of teeth
K.C.S.E Biology Q & A - MODEL 2006PP1QN11
State the role of insulin in human body.
answers
K.C.S.E Biology Q & A - MODEL 2006PP1QN08
State the role of vitamin C in humans.
answers
​Prevents scurvy/ prevent bleeding of gums/ prevent bleeding of gums/ Prevents poor healing of wounds/ prevent degeneration of muscle and cartilages/ prevent red spot on skin/ prevent anemia
Excretion absorption of iron Enables absorption of iron Boost immunity Development of healthy gums Synthesis/ maintenance of collagen fibres/ connective Name two modern methods of food preservation and for each state the biologic principle behind it.18/6/2020
K.C.S.E Biology Q & A - MODEL 2005PP1QN16
Name two modern methods of food preservation and for each state the biologic principle behind it.
answers
b) Refrigeration
It inactivates disease causing organisms/micro-organisms. Irridation –The radiation kills/destroys the micro-organism. Pasteurization (for milk only) Canning-Kills the micro – organisms.
K.C.S.E Biology Q & A - MODEL 2005PP1QN16
Name two organisms that cause food spoilage
answers
​a) - Fungus
-Bacteria
K.C.S.E Biology Q & A - MODEL 2005PP1QN03
What is the role of the vascular bundles in plant nutrition?
ANSWERS
K.C.S.E Biology Q & A - MODEL 2003PP1QN08
State a function of the large intestine in humans
answers
K.C.S.E Biology Q & A - MODEL 2003PP1QN04
What is the role of the bacteria named in (a) above?
answers
K.C.S.E Biology Q & A - MODEL 2003PP1QN04
Name the bacteria found in root nodules of leguminous plants.
answers
K.C.S.E Biology Q & A - MODEL 2002PP1QN12
The chart below represents a simplified carbon cycle.
​(a)Name the process labeled A, B, and C
A B C b) Name the organisms X and Y X Y c) State the importance of carbon cycle in nature
answers
​ a) A A photosynthesis
B Decomposition / decay C Respiration b) X Bacterial Y Fungi c) Regulate the CO2 in the atmosphere.
K.C.S.E Biology Q & A - MODEL 2002PP1QN10
What happens to excess fatty acids and glycerol in the body?
answers
K.C.S.E Biology Q & A - MODEL 2002PP1QN03
Give one example of a metallic co – factor
answers
K.C.S.E Biology Q & A - MODEL 2002PP1QN02b
Name the bacteria found in the root nodules of leguminous plant
answers
K.C.S.E Biology Q & A - MODEL 2002PP1QN02a
Name the bacteria found in the root nodules of leguminous plant
answers
K.C.S.E Biology Q & A - MODEL 2001PP1QN16
An experiment was carried out to investigate the nutritional value of two dry powder animals feeds X and Y over a period of six months. Twenty 5 month’s old castrated goats were use. The goats were divided into two equal groups A and B.
The animal’s in group A were fed on feed X throughout the experiment while those of group B were fed on feed Y. The feeds were supplemented with dry hay and water. The average body weight of each group of goats and the weight of the dry powder feeds were determined and recorded each month. The faeces produced by each group was dried and weighed and the average dry faecal output per month was also recorded. The results are as shown below.
(a) (i) What is the relationship between the amount of feed and the faecal output
(ii) Work out the average increase in weight for the animal’s in group A during The first four months The last two months (iii) Account for the average increase weight in goats in group A during the first four months The last two months (iv) Which of the two feeds is more nutritious? Give reason for your answer (b) State four uses of digested food in the bodies of animals (c) State four uses of water in the bodies of animals
answers
(a) (i) The more the feed the more the feacal output
The less the feed the less the faecal output (ii) The first four months
iii) Fast/ rapid/Active growth hence increase in weight
The last two months Slow growth, reached maturity iv) Feed X Give reason for your answer Group A gained (more) weight, on less food while group B lost weight on more food. b) growth, repair, protection, energy production c) a solvent, transport medium.. Hydrolyses of food, maintenance of temperature. K.C.S.E Biology Q & A - MODEL 2001PP1QN13
The diagram below represents the nitrogen cycle
(a) State the process labeled
A D (b) Name the compound represented by B (c) Name the group of organisms labeled C (d) (i) name the group of plants which promote process A (ii) State the part of the plant where process A takes place (e) How would excess pesticides in the soil interfere with process A
answers
​(a) A – Nitrogen fixation
D – absorption (b) Nitrate/ nitrates/ NO2 (c) Denitrifying bacteria/ Denitrifiers (d) (i) Leguminous plants, (acc. Legume/ acc examples e.g beans peas) (ii) Roots nodules; rej root or nodules alone; acc; root (e) – Killing / reducing of composers - Killing/reduction of nitrogen fixing bacteria/ nitrogen fixing microorganisms - Destruction of leguminous plants K.C.S.E Biology Q & A - MODEL 2001PP1QN12
The graph below shows the effect of substance concentration of the rate of enzyme reaction.
(a) (i) Account for the shape of the graph between A and B
(ii) B and C (b) How can the rate of reaction be increased after point B? (c) State two other factors that effect the rate of reaction of enzyme reaction
answers
(a) (i) More active sites of enzymes available, for a large number of molecules of substrate; hence increase in the rate of reaction ( rapid of fast increase in the rate of reaction)
(ii) B and C Enzymes/ substrate are in equilibrium / All active sites are occupied; hence rate of reaction is constant. (b) Raising concentration of enzymes (c) PH, temperature, inhibitors/ cofactors
K.C.S.E Biology Q & A - MODEL 2001PP1QN05
State two functions of muscles found in the alimentary canal of mammals.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2000PP1QN14
(a) Name the crop infested by phytophthora infestant and the disease it causes Crop / Disease
(b) State four control measures against the disease
answers
​(a) Crop
Potatoes / tomato Disease Tomato/potato bright/ Acc. Tomato rot (b) Use of fungicides Eradication of infected crop/ uprooting/ burning of infected plants Use biological control Use of disease resistant varieties Crop rotating
K.C.S.E Biology Q & A - MODEL 2000PP1QN03
State two ways in which some fungi are beneficial to humans
answers
K.C.S.E Biology Q & A - MODEL 1999PP1QN07
An investigation plants with red flowers were crossed with plants with white flowers.
All the plants in the F1 generation had pink flowers. a) Give a reason for the appearance of pink flowers in the F1 generation. b) If the plants the F1 generation were selfed, state the phenotypic ratio of the F2 generation.
answers
​a) Co dominance
Acc; partial/incomplete/equal b) 1 red flower 2 pink flowers 1 white flower Acc 1:2:1
K.C.S.E Biology Q & A - MODEL 1999PP1QN01
Name two processes that bring about the translocation of manufactured food
answers
K.C.S.E Biology Q & A - MODEL 1998PP1QN20
Explain how the mammalian intestines are adapted to perform their function.
answers
​The mammalian intestines are relatively long/coiled/folded. This allows food enough (enough) lime/increases surface area for digestion and absorption of products of digestion. The intestinal surface area for absorption. The glands have enzymes which secrete enzymes for digesting e.g. of correct enzyme, maltase, sucrase, lactase, enterokinase and peptidases. Some glands/goblets cells also produce mucus which protects the intestinal wall from being digested, reduce friction. Intestines have opening of ducts which allows bile/pancreatic juice into the lumen. The intestines have circular and longitudinal muscles whose contraction/relaxation/peristalis leads to the mixing of food with acc. At least enzymes/juices facilitating rapid digestion and helps pus food along the gut. Intestines are well supplied with blood vessels to supply oxygen/remove digested food. Presence of lacteal vessels for transport of fats/lipids.
Have thin epithelia to facilitate fast/rapid absorption/diffusion. Allow increase in surface area for absorption only. Cell biology/cytology. Occurrence of cell e.g. mitochondria, ribosome’s, nucleas, cytochromes organelle point to a common ancestry. |
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