A doffer is someone who removes bobbins, pirns or spindles holding spun fiber such as cotton or wool from a spinning frame and replaces them with empty ones. Historically, spinners, doffers, and sweepers each had separate tasks that were required in the manufacture of spun textiles. From the early days of the industrial revolution, this work, which requires speed and dexterity rather than strength, was often done by children. After World War I, the practice of employing children declined, ending
For a plant organ to bend in response to a stimulus, differential growth of cells on either side of the organ is required. For example, for the stem of a plant to bend toward a light source, cells on the shaded side of the stem near the shoot tip must elongate faster than cells on the lighted side.
plants, trees. It would be possible to grow plants on Mars only in technologically advanced, controlled environments that could keep the plants warm and give the plants enough atmosphere, light, and water to live.Scientists anticipate that humans would be able to use the Martian soil as a substrate for plant growth.t would be possible to grow plants on Mars only in technologically advanced, controlled environments that could keep the plants warm and give the plants enough atmosphere, light, and water to live. Scientists anticipate that humans would be able to use the Martian soil as a substrate for plant growth.