BIOL 1122 U6 LJ Briefly describe the process of transpiration in vascular plants PDF

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description of the transpiration process in the vascular plants...

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1. Briefly describe the process of transpiration in vascular plants -

Transpiration is the evaporation process occurring to the water held in the leaves and stems of plants. In transpiration, water travels from the soil into the roots of plants, and up to the underside of plant leaves, where it is released into the air (Sterling, 2021).

2. What environmental factors increase the rate of transpiration? -

Light

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Temperature

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Wind

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Humidity

3. Do any of the environmental factors (heat, light or wind) increase the transpiration rate more than the others? Why? -

Yes

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

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Heat: Plants transpire more rapidly at higher temperatures because water evaporates more rapidly as the temperature rises. At 30°C, a leaf may transpire three times as fast as it does at 20°C.

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Wind: as wind speed increases, more water evaporates form the leaves resulting in a faster rate of transpiration when compared to heat or light (Sterling, 2021).

4. Why do you think different species of plants transpire at different rates? -

Different species of plants transpire at different rates as they evolve based on environmental conditions. Plants with bigger leaves have a higher rate of transpiration as the leaves have more and larger stomata, which increases the rate of evaporation. The metabolic rate of the plant = plants with a higher metabolism have a higher transpiration rate. The amount of water in the soil – plants that have access to more soil water will transpire at a higher rate than those which don’t (Sterling, 2021).

5. Suppose you coated the leaves of a plant with petroleum jelly. How would the plant’s rate of transpiration be affected? -

Petroleum jelly would inhibit the loss of moisture out of the stomata cells. Therefore, the rate of transpiration would be decreased (Sterling, 2021).

6. Of what value to a plant is the ability to lose water through transpiration? -

The process of water loss from a plant is called transpiration; this keeps the plant's temperature stable, which is an essential aspect of photosynthesis; aids photosynthesis by pumping water and minerals from the soil to the leaves (Sterling, 2021).

Multiple Choice Transpiration in plants is driven by: B) Capillary action Stomata: B) permit the intake of carbon dioxide Water can be lost by a plant through which process(es)? D) A and B In your research, transpiration was observed by: C) Directly measuring the amount of water absorbed through the plant sprig’s stem Wind did not have the greatest effect on transpiration rate in which plant type? B) Geranium Colder temperatures cause stomata to remain closed. Based on this information, if a plant were grown below 21oC would you expect transpiration rates to: B) Decrease Wind appeared to increase the rate of transpiration in most plants tested. This is most likely due to the fact that: D) All of the above Cacti grow in arid regions such as deserts. Compared to other plants, transpiration in cacti would most likely be:

A) Lower

Reference Sterling M. T., (2012). Transpiration - Water Movement through Plants. Plant Pathology and Weed Science. New Mexico State University retrieved from https://passel2.unl.edu/view/lesson/c242ac4fbaaf...