Plant Transpiration Lab

1.     Water evaporates through stomata that are on the underside of the leaves and creates a transpiration force, which draws water up from the roots of plants and help plants absorb water and nutrients from the soil.

2.     The controls include the same amount of time, same temperature when heater’s not involved, same amount of air circulation when fan’s not involved and same amount of light when lamp’s not involved.

3.     The amount of light, temperature and the speed of air circulation can in crease the rate of transpiration, but not all transpiration rates increase. When more light is provided, Rubber plant, Dieffenbachia, Weeping fig and Zebra plant’s transpiration rate decreased.

4.     The transpiration rate increases more when the temperature is higher. It increases even more when there is wind. It’s because when temperature is higher, the water molecules are more active and easier to evaporate. When there’s wind, the water in the air is blown away, so the humidity is lower. The water molecules in the plant are more likely to evaporate.

5.     Rubber plant has the highest transpiration rate. Different plants have different transpiration rates because they live in different environments. Plants live in humid environments have higher transpiration rate. Plants that live in windy, hot or dry environments have lower transpiration rate.

6.     The plant would not be able to transpire because the stomata will be covered.

7.     The loss of water molecules draws new water molecules up the stem and allows the plant to absorb water and nutrients from the soil.