Question

Arrange the parts of a tensiometer from the bottom to the top of the instrument.
A. Transparent pipe
B. Connecting tube
C. Ceramic cup
D. Vacuum gauge
Choose the correct answer from the options given below:

• A. A, B, C, D
• B. A, C, B, D
• C. B, A, D, C
• D. C, B, A, D

Hint:

Visualize building a tensiometer from the ground up: You start with the part that goes in the soil (Ceramic Cup), connect it with a tube (Connecting tube), add the main water reservoir (Transparent pipe), and cap it with the measuring device (Vacuum gauge).

Answer 1

The Correct Option is C

Step 1: Understand the construction of a tensiometer.
A tensiometer measures soil water potential (suction). It consists of a porous tip that is placed in the soil, connected by a water-filled tube to a vacuum gauge.
Step 2: Arrange the components from bottom (in the soil) to top.
1. C. Ceramic cup: This is the porous tip at the very bottom of the instrument, which is inserted into the soil. Water moves through the pores of the cup, creating a vacuum in the tube.
2. B. Connecting tube: A short section of tube that connects the ceramic cup to the main body of the instrument.
3. A. Transparent pipe: The main body of the tensiometer, which is a clear, rigid tube filled with water. It allows the user to see if any air bubbles have entered the system.
4. D. Vacuum gauge: Located at the very top of the instrument, this gauge (manometer) measures the vacuum or tension created in the water column, which corresponds to the soil water potential.
The correct sequence from bottom to top is C \(\rightarrow\) B \(\rightarrow\) A \(\rightarrow\) D.