Give one reason why Africans were denied equal educational opportunities with other races during the colonial period. (Answered)
Identify two sources of origin of Nyayoism. (Answered)
Name two treaties which were signed that marked colonial spheres of influence in East Africa. (Answered)
What is meant by collective responsibility of the cabinet? (Answered)
State two functions of the Independent Electoral and Boundaries Commission of Kenya. (Answered)
Give one reason why Omani rulers were interested in establishing their control over the Kenyan coast (Answered)
Identify two types of democracy. (Answered)
Identify one major cause for increased slave trade in East Africa in the 19th century. (Answered)
Give one way in which the knowledge of iron working helped in the migration of the Bantu. (Answered)
Name the basic unit of the political organization among most Kenyan communities during the pre-colonial period. (Answered)
What impact did the southern Cushites have on other Kenyan communities? (Answered)
The table provided shows the concentration of sodium and iodine in sea water and cell sap of a plant.
(a) (i) Name the process through which the plant
cell take up sodium ions.
(ii) Give a reason for your answer in (a) (i) above.
(b) If the plant was sprayed with a chemical that inhibit respiration.
(i) Which of the two ions uptake will be affected?
(ii) Give a reason for your answer in (b) (i) (Answered)
What is meant by each of the following terms?
(i) Crenated cell
(ii) Flaccid cell (Answered)
Explain two roles of diffusion in human beings. (Answered)
The diagram below shows a set up for an experiment to demonstrate a certain physiological process
(a) What nature of solution is represented by 20% sugar solution?
(b) Explain the observation made on the set up after one hour. (Answered)
State two ways in which osmosis is significant to plants (Answered)
Describe how turgor pressure builds up. (Answered)
Why is the palisade layer a tissue? (Answered)
The diagram below represents a cell as seen under an electron microscope.
(a) Based on the diagram, state whether it represents an animal cell or plant cell
(b) Give two reasons for your answer in (a) above (Answered)
Explain how an increase in temperature affects the rate of active of transport. (Answered)
What is meant by term Wilting? (Answered)
State three factors that affect the rate of diffusion. (Answered)
In an investigation a student extracted three pairs of pawpaw cylinders using a cork borer. The cylinders were cut back to 50mm length and placed in a beaker containing a solution. The results after 40 minutes were as shown in the table below.
(a) Account for the results in the table above.
(b) What would be a suitable control set up for the investigation? (Answered)
The diagram below show an experimental set-up to investigate a certain process in a plant tissue.
Explain the results obtained after 30 minutes. (Answered)
Distinguish between haemolysis and plasmolysis (Answered)
Name the type of movement that occurs within a plant cell (Answered)
State one role that is played by osmosis in animals (Answered)
State one role that is played by osmosis in Plants (Answered)
Distinguish between diffusion and active transport (Answered)
A freshly obtained dandelion stem measuring 5cm long was split lengthwise to obtain two similar pieces. The pieces were placed in solutions of different concentrations in petri dishes (L1 and L2) for 20 minutes. The appearance after 20 minutes is as shown
(a) Account for the appearance of the pieces in solution L1 and L2
(b) State the significance of the biological process involved in the (Answered)
The diagram below show a red blood cells that was subjected to a certain treatment.
Account for the shape of the cell at the end of the experiment (Answered)
Distinguish between diffusion and osmosis (Answered)
An experiment was set up as shown below.
The setup was left for 30 minutes.
(a) State the expected results
(b) Explain your answer in (a) above (Answered)
State the importance of osmosis in plants. (Answered)
Outline three roles of active transport? (Answered)
How do the following factors affect the rate of diffusion?
(i) Diffusion gradient
(ii) Surface area to volume ratio.
(iii) Temperature (Answered)
Why is oxygen important in the process of active transport in cells? (Answered)
Explain what would happen to red blood cells if they are placed in a concentrated salt solution. (Answered)