This image describes Experiment 17.1, which aims to investigate the rate of water loss from plant leaves of different species (mango and sunflower) under the same environmental conditions.

This image describes Experiment 17.1, which aims to investigate the rate of water loss from plant leaves of different species (mango and sunflower) under the same environmental conditions.

The experiment involves:

1. Weighing fresh leaves (initial weight at 0 minutes).
2. Hanging them in an airy environment.
3. Re-weighing the leaves every 15 minutes for one hour (at 15, 30, 45, and 60 minutes).
4. Recording the weights in a table.

Based on the experiment description and the partially visible formulas, here are the correct formulas for calculating water loss:

1. Amount of water loss over a specific time interval:
To find the amount of water lost between two consecutive weighings, subtract the later weight from the earlier weight.

$$\text{Amount of water loss} = \text{Previous Weight} - \text{New Weight}$$

For example, the amount of water loss between 0 and 15 minutes would be:

$$\text{Amount of water loss (0-15 min)} = \text{Weight at 0 min} - \text{Weight at 15 min}$$

2. Rate of water loss over a specific time interval:
To find the rate of water loss, divide the amount of water lost by the time taken for that loss.

$$\text{Rate of water loss} = \frac{\text{Previous Weight} - \text{New Weight}}{\text{Time Interval}}$$

For example, the rate of water loss between 30 minutes and 45 minutes (as partially shown in the image) would be:

$$\text{Rate of water loss (30-45 min)} = \frac{\text{Weight at 30 min} - \text{Weight at 45 min}}{\text{15 minutes}}$$

3. Overall Percentage of weight lost (Overall Percentage Water Loss):
To find the total percentage of water lost from the beginning to the end of the experiment, use the initial weight (at 0 minutes) and the final weight (at 60 minutes).

$$\text{Overall Percentage of weight lost} = \frac{\text{Initial Weight (at 0 min)} - \text{Final Weight (at 60 min)}}{\text{Initial Weight (at 0 min)}} \times 100\%$$