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
Care for a hula girl hibiscus by planting it in a location that provides the right amount of sun and heat. You need to use the proper soil, and you need to fertilize and water it thoroughly. You need rich soil, fertilizer and water.Full Answer >
Grow sugar cane by choosing a good location, planting stalks in furrows, giving them plenty of room to grow, watering them regularly and fertilizing them. This process takes up to four years, which is how long one planting lasts. You need mature cane stalks, shears, water and fertilizer.Full Answer >
Blue flowers include the blue hydrangea, rozanne geranium, delphinium, brunnera and bluestar. Others include the bellflower, balloon flower and morning glory. These flowers vary in shades of blue and purple.Full Answer >
Basil can be preserved by drying the leaves, freezing them whole or freezing them in liquid. Basil must be preserved before the first frost, which kills the heat-loving herb.Full Answer >