Q:

How do plants move?

A:

Plants can move when their cells grow as a response to either light or gravity, which they are able to detect even as seedlings. This type of movement is slow and permanent. Other kinds of plants are capable of quick, momentary bursts of movement, which is due to hydraulics.

Phototropism occurs when the pigment phototropin absorbs light. This pigment is present in the tips of plant shoots, which are the sources of directional growth in the plant. Once phototropin absorbs light, the growth hormone auxin is released, causing the cells of the plant to divide. Auxin directly responds to the direction of light, thus allowing the plant to grow where light is strongest.

Gravitropism, which also utilizes auxin, allows a plant to grow either toward or away from gravitational direction. This process is regulated by statoliths, or small packages of starch that are present in the shoot tips and roots of the plant. When the plant is tilted, the statoliths settle on whichever side gravity dictates. Auxin is then released in that direction.

Some predatory plants such as the Venus flytrap move as a response to physical stimulus. Tiny hairs cover the Venus flytrap's surface and allow the plants' cells to sense pressure. Once enough pressure is reached, chloride ions are released that allow an electrical signal to travel throughout the plant. This causes potassium ions to enter and exit cells. Water then follows, as parts of the plant function as levers.

Learn More
Sources:

Related Questions

  • Q:

    How far apart should I plant tomatoes?

    A:

    Tomato seedlings should be planted 2 feet apart, according to the Old Farmer's Almanac. The wide spacing accommodates mature plants and allows enough room for wire cages, which stake the tall plants and provide protection from birds and animals.

    Full Answer >
  • Q:

    How do you grow vegetables?

    A:

    To grow vegetables, raise the seedlings from indoors, tend the outside soil, and place the seeds in the garden bed when they are fully mature. You need a spray bottle, peat moss, trays, vermiculite and compost. Also grow lights, scissors, a power tiller, a hoe and plastic wrap can help complete this project.

    Full Answer >
  • Q:

    How do you grow great tomatoes?

    A:

    Grow great tomatoes by choosing a good location, preparing the planting area, planting the seedlings deep, watering and mulching the plants well, fertilizing the plants regularly and selectively pruning the plants. You need tomato plants, compost, mulch, fertilizer, pruning scissors and black plastic.

    Full Answer >
  • Q:

    When should you plant okra?

    A:

    If you are starting the okra seeds indoors, plant them three or four weeks before the last spring frost date for your area, and set them out when the seedlings are 6 weeks old. Otherwise, wait to plant okra until the soil has reached 65 degrees Fahrenheit.

    Full Answer >

Explore