Gas exchange happens in the spongy mesophyll tissue of the leaf. Spongy mesophyll cells are covered by a thin layer of water and loosely packed. When the plant is photosynthesising during the day, these features allow carbon dioxide to diffuse into the spongy mesophyll cells, and oxygen to diffuse out of it.pongy mesophyll cells are covered by a thin layer of water and loosely packed. When the plant is photosynthesising during the day, these features allow carbon dioxide to diffuse into the spongy mesophyll cells, and oxygen to diffuse out of it.
In biometrics and forensic science, minutiae are major features of a fingerprint, using which comparisons of one print with another can be made. Minutiae include: 1  Ridge ending â the abrupt end of a ridge. 2  Ridge bifurcation â a single ridge that divides into two ridges. 3  Short ridge, or independent ridge â a ridge that commences, travels a short distance and then ends.
1 Dune ridges:- In areas of large-scale dune activity, certain types of dunes result in sand ridges. 2  Moraines and eskers:- Glacial activity may leave ridges in the form of moraines and eskers. 3  An arete arÃªte is a thin ridge of rock that is formed by glacial.  erosionidges are usually termed hills or mountains as well, depending on size. There are several main types of ridges:-. 1  Dendritic ridge:- In typical dissected plateau terrain, the stream drainage valleys will leave intervening ridges.