Relationship between leaf surface area and transpiration excessive

Transpiration Lab by jean ralph on Prezi

The aim was to vary the transpiration rate of water culture plants and to . to maintain the solution round the root system at a constant level, a simple float- fixed over the compost surface in experiments using soil to prevent evaporation of soil. There was an inverse relationship between Thickleaf and transpiration rate and . to chloroplasts in a liquid solution through cell wall and membranes (Nobel, ). . Maximum net photosynthetic rate per unit (one side) of leaf surface area. Transpiration Lab 2. The plant will want to increase its need for water and achieve homeostasis; this will cause all of the water to be lost due to the salt. There is a relationship because if a plant is in a dry environment, the plant should evolve so that Leaf surface area- About 5cm square 50mm square.

The ingenious system that regulates this function consists of a guard cell on each side of the tiny pores stomata. When water moves into the guard cells, they swell and arch open; as water moves out, the guard cells relax and close. The guard cells are sensitive to light intensity, temperature, wind, relative humidity and carbon dioxide concentrations inside the leaf.

  • Does Leaf Surface Area Affect the Rate of Transpiration in a Plant?
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The stomata pores must open to take in carbon dioxide for photosynthesis especially important on mornings of sunny days. And the more they are open, the more plants transpire and lose water. So watering plants early in the morning will support plant energy, especially on hot summer days. What causes water to rise up through a plant sometimes feet or more against the force of gravity?

This is achieved by the pumping action of transpiration, which is another ingenious system. It depends on the tiny capillary xylem water channels, the extremely strong cohesive bonding properties of water molecules, and a sucking force created when water at the top of the channels evaporates. Like sucking on a soda straw, transpiration causes a negative pressure which lifts the column of water to the leaf surface.

As plants transpire, the soil becomes dryer. Then in summer, if the soil becomes very dry, plants cannot transpire enough to keep cool. In desperation plants may start losing leaves or completely defoliate as a way to keep transpiration from dehydrating the plant.

Here in the West, in order to help our plants keep cool and keep them photosynthesizing, we can give them extra water in the hottest, driest months. We can plant wind breaks and trees and shrubs that will offer a little shade, and we can mulch to keep soil moisture from evaporating.

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Because they have leaves, they continue to transpire in the winter, and can dehydrate. This is especially true for any evergreen that is planted in the fall, but critical for fall-planted ball-and-burlap evergreen trees. So water evergreens once or twice a month in winter. Transpiration is an elegant, sustainable natural design that performs its vital functions without electricity, without fossil fuels and without moving parts.

It does not pollute or use excessive resources. It actually adds moisture to the atmosphere and contributes to rainfall.

LabBench Activity

Using a potometer rightone can study the effect of various environmental factors on the rate of transpiration. As water is transpired or otherwise used by the plant, it is replaced from the reservoir on the right.

This pushes the air bubble to the left providing a precise measure of the volume of water used. Environmental factors that affect the rate of transpiration 1.


Light Plants transpire more rapidly in the light than in the dark. This is largely because light stimulates the opening of the stomata mechanism. Light also speeds up transpiration by warming the leaf.

Temperature Plants transpire more rapidly at higher temperatures because water evaporates more rapidly as the temperature rises. Humidity The rate of diffusion of any substance increases as the difference in concentration of the substances in the two regions increases. When the surrounding air is dry, diffusion of water out of the leaf goes on more rapidly. Wind When there is no breeze, the air surrounding a leaf becomes increasingly humid thus reducing the rate of transpiration. When a breeze is present, the humid air is carried away and replaced by drier air.

Soil water A plant cannot continue to transpire rapidly if its water loss is not made up by replacement from the soil. When absorption of water by the roots fails to keep up with the rate of transpiration, loss of turgor occurs, and the stomata close.