Q:

Why do plants need water to grow?

A:

Quick Answer

Plants need water to grow because plants require internal water pressure to strengthen the stems and leaves, and plants need water to create energy. Water is also necessary for photosynthesis, which occurs in the plant's leaves with water from the stem.

Know More

Full Answer

All living things need water to grow. Plants are made up of about 90 percent water and therefore require more water than animals. Water pressure inside a plant is called turgor. Without turgor, the plant wilts and dies. The internal water pressure is created when the plant absorbs water from the ground, up through the stem, to the leaves. The water is needed to create a skeleton for the plant so the plant can remain upright.

Once the water reaches the leaves, photosynthesis occurs during the daylight hours. During photosynthesis, the plant creates food. Without water, the plant could not create the sugar it needs for energy. Water travels up the stem to the leaves, and there, the water is exchanged for carbon dioxide during transpiration. This natural process only occurs when sunlight is present. Transpiration also serves to cool down the plant, much like sweating cools a human being. The water exits the leaves through small holes called stomata.

Learn more about Botany

Related Questions

  • Q:

    When does photosynthesis occur?

    A:

    Photosynthesis, the process by which plants convert the sun's energy to glucose, takes place during daylight hours when the plant's leaves are exposed to sunlight. This process only occurs in green plants and in some protist species. Carbon dioxide and water must also be present in order for photosynthesis to occur.

    Full Answer >
    Filed Under:
  • Q:

    How do aquatic plants breathe underwater?

    A:

    Aquatic plants are able to absorb the carbon dioxide (CO2) they need to make food directly from the water around them through their leaves, just as land plants obtain carbon dioxide from the air. The water provides the nutrients necessary for an aquatic plant to "breathe" underwater.

    Full Answer >
    Filed Under:
  • Q:

    What is the process of transpiration?

    A:

    The process of transpiration is when water moves through plants from the roots to the leaves, then changes to vapor as it leaves the plant. Transpiration cools the plant and also provides it with nutrients, carbon dioxide and water.

    Full Answer >
    Filed Under:
  • Q:

    How does water move through a leaf?

    A:

    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.

    Full Answer >
    Filed Under:

Explore