Transpiration efficiency refers to

Options

A. water absorption transpiration ratio
B. transpiration in relation to absent of sap
C. weight of dry matter produced per kg of water tranpired
D. none of these

Answer

**Step-by-Step Text Solution:**

1. **Understanding Transpiration:**
- Transpiration is the process through which plants lose water vapor from their aerial parts, primarily through small openings called stomata. This process is essential for maintaining plant health and facilitating nutrient transport.

2. **Defining Transpiration Efficiency:**
- Transpiration efficiency refers to the ratio of the amount of dry matter produced by a plant to the amount of water lost through transpiration. It is a measure of how effectively a plant uses water to produce biomass.

3. **Calculating Transpiration Efficiency:**
- To calculate transpiration efficiency, you take the total dry weight of the plant (excluding water) and divide it by the total amount of water transpired. This gives you an indication of how much biomass is produced per unit of water used.

4. **Importance of Transpiration Efficiency:**
- High transpiration efficiency is crucial for maximizing crop production, especially in water-scarce environments. It indicates that a plant can produce more biomass with less water, which is beneficial for agriculture.

5. **Evaluating Options:**
- The question provides several options to define transpiration efficiency:
- Option 1: Water absorption transpiration ratio - Incorrect, as this does not relate to the loss of water.
- Option 2: Relation to ascent of sap - Incorrect, as this describes water movement rather than water loss.
- Option 3: Weight of dry matter produced per kg of water transpired - Correct, as this accurately describes transpiration efficiency.
- Option 4: None of these - Incorrect, since option 3 is correct.

6. **Conclusion:**
- The correct definition of transpiration efficiency is the weight of dry matter produced per kg of water transpired, making option 3 the right choice.