Question

The amount of water including transpiration, plant growth, evaporation from the soil, and drainage loss required to produce a unit of dry weight material is a measure of:

• A. Water use efficiency
• B. Percolation loss
• C. Field capacity
• D. Evapotranspiration

Hint:

Water use efficiency relates crop production to the amount of water used.

Answer 1

The Correct Option is A

Concept:
Water use efficiency expresses the relationship between plant production and the amount of water used.

Step 1: Understand water use.
Water used by a crop includes transpiration, evaporation, drainage loss and water used in plant growth.

Step 2: Connect water use with dry matter production.
When water use is related to production of unit dry matter, it becomes a measure of water use efficiency. \[ \text{WUE}=\frac{\text{Dry matter or yield}}{\text{Water used}} \]

Step 3: Select correct option.
The best matching term among the options is: \[ \text{Water use efficiency} \] \[ \therefore \text{Correct Answer is (A)} \]