Transpiration Lab

Topics: Water, Transpiration, Photosynthesis Pages: 2 (386 words) Published: November 10, 2012

Transpiration is the process through which water is lost from a plant. Water is taken into a plant through roots and root hairs by osmosis, and it exits the plant through stomata. Transpiration helps the diffusion of both O2 and CO2 plus it helps the movement of water throughout the plant.

There are some factors that affect the rate of transpiration of the plant. Those factors are mainly humidity, soil water supply, sunlight, temperature and wind. Any alteration of these factors will have an impact on the rate of transpiration and other metabolic activities occurring throughout the plant.

As being said, wind, one of the factors affecting transpiration rate is a major one. In the presence of a windy environment, plants will do transpiration more as the removal of water from the leaves will be faster.

Aim: To observe the relationship between the impact of moving air and the transpiration rate of a basil plant branches within the interval of 1 hour.

Research question: Does moving air (wind) have an impact on the rate of transpiration of a plant?

Hypothesis: Plants that are put near the windy conditions will have a higher transpiration rate than plants put under still air conditions because removal of water molecules from leaves will be faster.


Independent Variable | Wind |
Dependent Variable| Transpiration rate|

Controlled Variables:

Time (by chronometer)
Type of plant
Temperature (same environment)
Light (same environment)
Humidity (same environment)

Material List:

A chronometer
A fan
A basil plant
A knife
A balance


1. Carefully cut two branches containing same number of leaves (if possible branches having equal amount of leaf areas) from the basil plant with the knife. 2. Weigh their initial masses by the balance and record them. 3. Put one of the branches in which there is no moving air and one to the in front of fan. 4....
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