Why do rays run radially in a woody stem? How would wood produced in a dry year differ from wood produced in a wet year? What is dendrochronology? Solution Dear student, Wood produced in dry year: Is just brought on by serpula lacrymans and is the most genuine type of parasitic rot in a building. It can spread onto and crush a great part of the timber. Signs for dry decay: Particular mushroom smell White contagious development with yellow and lilac tinges Profound splits show up inside the wood Both delicate and hardwoods can be harmed Wood produced in wet year: Happens all the more every now and again, yet is less genuine; rot is normally bound to the range where timber has gotten to be and stays wet. Indications of wet decay : Mutilation, discolouration, non-abrasiveness and breaking Loss of quality to the timber Noticeable contagious development – this may now and again happen Smell – there might be a soggy smelly smell Flare-ups of dry and wet decay begin in comparative ways. The develop fruiting assortments of wood-annihilating organisms that create amid an assault deliver a large number of tiny spores and these are generally scattered via air streams. In the event that they fall on untreated moist wood they will develop by pushing out an empty tube called a hypha which develops and branches to frame a mass of hyphal strings called mycelium. The principle contrasts between dry year and wet year are the level of advancement of mycelium on the wood surface and the capacity of the organism to spread into different timbers by means of nearby brick work. It is imperative that the two sorts of rot be recognized since they require distinctive treatment. Part3 Dendrochronology is the investigation of environmental change as recorded by tree development rings. Every year, trees include a layer of development between the more established wood and the bark. This layer, or ring as found in cross segment, can be wide, recording a wet season, or thin, recording a dry developing season. Since the rings are essentially recording a decent developing season or a terrible developing season, they are in a roundabout way recording more than just dampness. They likewise record temperature and overcast cover as they effect tree development too. This record of yearly summer data is imperative when you consider that specific sorts of trees develop gradually over several years, and subsequently contain a record of the same number of years of atmosphere and environmental change..