EVOLUTION
1.      1989 Q7 P1
State the difference between Lamarckian and Darwinian theories of evolution.
2.   1991 Q17 P1
    (a) What is meant by natural selection
    (b) Describe the natural selection brings about adaptation of a species to its Environment
3.  1992 Q5 P1
Two populations of the same species of birds were separated over a long period of   time by an ocean. Both populations initially fed on insects only. Later it was observed that one population fed entirely on fruits and seeds, although insects were available.

K.C.S.E Biology Q & A - MODEL 2018PP2QN08

K.C.S.E Biology Q & A - MODEL 2018PP2QN07

K.C.S.E Biology Q & A - MODEL 2018PP2QN07

The effect of auxin concentration on growth response of two parts of a plant, X and Y was investigated over a period of time. The results were tabulated as shown in the table below.

(a) On the same axis, draw line graphs of the effect on growth of the two parts, X and Y (percentage inhibition or stimulation) against the concentration 
(b) With reasons, name the two parts of the plant, X and Y.
X 
Reason 
Y
Reason
(c) From the graph identify: .
(i) the point at which the percentage stimulation was the same for both X and Y. 
(ii) the optimum concentration of auxins required for part Y 
(d) State three ways in which the effects of auxins on plants is applied in flower farming.
(e) Distinguish between simple and conditioned reflex action 

The photograph below represents a plant in a Certain Division

​(a) (i) Name the Division to which the plant belongs. 
(ii) With reference to the Photograph, state three observable features of the Division named in a(i) above. 
(b) Name the part labelled N and P.
N
P
(c) Explain how the part labelled Q is adapted to its function 

The diagram below illustrates the arrangement of bones in a human arm.

​(a) Name:
(i) the type of joints formed at points H and M.
H
M
(ii) bone  G 
(b) Name bone J and state how it is adapted to its functions.
Name
Adaptation 
(c) State one functional difference between a tendon and a ligament.

The amount of blood flowing tough certain pans in the mammalian body at different activity levels was measured and results tabulated as Shows in the table below.

​(a) Account for:
(i) the high blood flow through the cardiac and skeletal muscles during strenuous exercises.
(ii) the results obtained for the alimentary canal at rest. 
(b)Name two waste materials excreted by both the skin and the kidneys.

Below is a graphical representation of students’ height in a classroom.

​(a) Name the type of curve illustrated. 
(b) (i) State the type of variation represented by the curve. 
(ii) State two meiotic processes that lead to variation among organisms. 
(iii) Explain the role of variation in organisms. 
(c) Explain the need for genetic counselling in present day health facilities.

The diagram below illustrates a section of the mammalian kidney.

​(a) Name the structures labelled E and F.
E 
F
(b) Explain the processes that take place in the regions labelled G and H.
Region G 
Region H 

Below is a graphical representation of how basal metabolic rates compare in Various animals.

​From the graph, explain why the mouse has a higher breathing rate than the elephant.

K.C.S.E Biology Q & A - MODEL 2018PP1QN26

 Desert kangaroo rats spend most of their time in underground burrows,
(a) Name this type of behavioral activity 
(b) Explain the significance of this behaviour to the organism. 

K.C.S.E Biology Q & A - MODEL 2018PP1QN24

State two characteristics of living things illustrated in the photograph below.