Questions 26-28 An experiment was carried out to study the...

Questions $26-28$ An experiment was carried out to study the rate of transpiration in plants. Four two-week-old bean seedlings were used. Each one was inserted into one end of a length of plastic tubing, and a calibrated pipette was inserted into the other end as shown below. The tubing was completely filled with water. As the plant loses water from its leaves by transpiration, it takes in more water from the pipette. The quantity of water absorbed by the plant can be measured by taking readings from the pipette. See drawing. Each of the four setups is exposed to different conditions. The experiment is allowed to run for 2 hours with readings taken every 15 minutes. The control setup is at room temperature with normal room illumination. Predict which line on the graph matches each condition below: A second light source is added

Questions $26-28$ An experiment was carried out to study the rate of transpiration in plants. Four two-week-old bean seedlings were used. Each one was inserted into one end of a length of plastic tubing, and a calibrated pipette was inserted into the other end as shown below. The tubing was completely filled with water. As the plant loses water from its leaves by transpiration, it takes in more water from the pipette. The quantity of water absorbed by the plant can be measured by taking
readings from the pipette. See drawing.
Each of the four setups is exposed to different conditions. The experiment is allowed to run for 2 hours with readings taken every 15 minutes. The control setup is at room temperature with normal room illumination. Predict which line on the graph matches each condition below:
A second light source is added

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Key Concepts

Plant Transpiration

Transpiration is the process by which water evaporates from the surfaces of plant leaves, mainly through stomata. This process is essential for driving the upward movement of water and nutrients from the roots to the rest of the plant, and it also plays a role in cooling the plant and maintaining its internal water balance.

Effect of Light on Transpiration

Light significantly influences the rate of transpiration by triggering the opening of stomata, which increases the evaporation of water from the leaves. Additional light sources can elevate the intensity of light, thereby enhancing the transpiration rate through greater stomatal opening and a boost in water uptake from the roots.

Experimental Measurement in Plant Physiology

Experimental setups designed to measure transpiration often involve tracking the changes in water levels over time, serving as a proxy for the rate of water loss. Such experiments help isolate the effects of different environmental factors, like light or temperature, on plant water dynamics and overall physiological behavior.

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