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.
What is an Aseismic Ridge Landform? An aseismic ridge is a mountain ridge or chain of seamounts under the ocean. They do not produce seafloor spreading or seismic activity, except in the area of a âhotspotâ at one end of the ridge. Aseismic ridges are formed by a hotspot in the mantel under the Earthâs crust. As a tectonic plate moves over the hotspot, a series of seamounts can form on the ocean floor over a period of millions of years. This may be in the form of mountains, guyots or undersea plateaus.