Contribution of passive water absorption to total water absorption is

Options

A. `50%`
B. `70%`
C. `80-90% `
D. `96-100%`

Answer

To solve the question regarding the contribution of passive water absorption to total water absorption in plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Water Absorption in Plants**:
- Water absorption in plants occurs through two main mechanisms: passive and active absorption. Passive absorption primarily occurs through the roots and is driven by physical processes such as osmosis and capillary action.

2. **Define Passive Water Absorption**:
- Passive water absorption refers to the uptake of water by plant roots without the expenditure of energy. This process is largely dependent on the water potential gradient between the soil and the plant cells.

3. **Identify the Contribution of Passive Absorption**:
- Research and studies indicate that passive water absorption can account for a significant portion of total water absorption in plants.

4. **Analyze the Options Provided**:
- The options given are:
- 50 percent
- 70 percent
- 80 to 90 percent
- 96 to 100 percent

5. **Select the Correct Option**:
- Based on scientific understanding, passive water absorption can contribute up to 96 to 100 percent of the total water absorption in certain conditions, especially when the plant is not actively engaging in metabolic processes (e.g., during periods of dormancy or death).

6. **Conclusion**:
- Therefore, the correct answer is that the contribution of passive water absorption to total water absorption is **96 to 100 percent**.

### Final Answer:
The contribution of passive water absorption to total water absorption is **96 to 100 percent**.

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