Biology 2023 JAMB Past Questions - Question 9: Samples of different soil types are packed in glass tubes whose lower ends are plugged with cotton wool, if these tubes are suspended hi a trough of water, water will rise highest after a few hours in

Correct Answer

C

Explanation

The question describes a classic experiment that demonstrates capillary action in different soil types. Capillary action is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.The height to which water rises in the tubes depends on the capillary action of the soil. Soil with finer particles (smaller particle size) generally has higher capillary action because water can move more easily through the smaller spaces between particles.So, in the experiment described:

• Soil with finer particles (smaller particle size) will cause water to rise higher in the tubes because it has greater capillary action.
• Soil with coarser particles (larger particle size) will not allow water to rise as high in the tubes because it has lower capillary action.

Therefore, the solution to the question is that the water will rise highest in the tube containing the soil with the finest particles.