Crop marks appear due to the principle of differential growth.
2.
Differential growth will naturally follow any features buried below.
3.
The changed relations in concentration of auxin leads to differential growth of the root tissues.
4.
However plant cells are mostly immotile so morphogenesis is achieved by differential growth, without cell movements.
5.
By differential growth the neck elongates and new arches form, so the pharynx has six arches ultimately.
6.
Droughts can be especially useful to cropmark hunters as the differential growth can become apparent in normally hardy species such as grass.
7.
Sclerochronology can reconstruct historical temperature data from growth increments in shells of many calcifying organisms based on differential growth rates at different temperatures.
8.
During development, differential growth of the wall of the stomach causes it to rotate to the left, and the liver and stomach undergo a lot of growth.
9.
However, due to difficulty in culturing many of the organisms, the differential growth rates of the organisms, and labor involved, this proved to be not satisfactory.
10.
Differential growth during tropisms mainly involves changes in cell expansion versus changes in cell division, although a role for cell division in tropic growth has not been formally ruled out.
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