Q:

How does water move through a leaf?

A:

Quick Answer

How Stuff Works explains that water reaches the leaves of plants through the xylem vessels, and it escapes through small holes in the leaf known as stomata. The process by which the water moves from the capillaries to the xylem vessels and into the stomata is called transpiration. Plants absorb water through their roots, which contain capillaries. The capillaries are responsible for sending water through the xylem vessels.

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Full Answer

According to the BBC, many plants contain 90 to 95 percent water. Since plants are made up of mostly water, they are dependent on it to stay alive. Water is responsible for the regulation of temperature in plants and for the transportation of nutrients throughout the plant. Plants receive water from rainfall, dew and natural and man-made irrigation systems in order to survive.

Green plants use water for photosynthesis. Photosynthesis allows plants to produce the sugar which they need for food. Plants are also dependent on water to support their physical structures. During the process of osmosis, which is the movement of water from the outside of a plant's cells to the inside of the cells, the plant's cell wall receives the structural support that it requires, according to How Stuff Works.

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Related Questions

  • Q:

    What is the function of stomata?

    A:

    Stomata are microscopic openings on the surfaces of plant leaves that allow for the easy passage of water vapor, carbon dioxide and oxygen. They are crucial to the function of leaves as photosynthesis requires plenty of carbon dioxide as well as the release of waste oxygen and excess water. "Stomata" means "mouth" in the Greek language.

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  • Q:

    Where are stomata found?

    A:

    The stomata in plant cells can be found in the epidermis of leaves, stems and other parts of the plant involved in gas exchange. The pores inside the spongy layer of the plant leaf help aid in the exchange of gases between the leaf and its environment, and these pores eventually open up to the outside through the stomata.

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  • Q:

    When are the stomata usually open?

    A:

    Stomata open when there is sunlight. Therefore, stomata are usually open during the day and closed at night. However, according to Darwinian principles, plants that reside in arid environments have developed characteristics that affect the opening and closing of stomata to help withstand water shortage.

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  • Q:

    What causes the stomata to open and close?

    A:

    There are guard cells surrounding each stoma that cause them to open or close throughout the life cycle of the plant. This occurs in response to water and ion concentration in the plant cell, according to Pearson Education.

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