Moss stage - xerarch, Biology

Assignment Help:

Moss Stage - Xerarch

The accumulation of soil, particularly in the crevices and depressions of rock favours the growth of certain xerophytic mosses, e.g., species of Polytrichum, Tortula and Grimmia. The spores of these mosses are brought by the blowing wind. They have more or less the same power of withstanding desiccation as that of foliose lichens.

The lichens and mosses grow together and compete 'with one another. The rhizoids of mosses and foliose lichens compete for water and nutrients, and the stems of the former attain greater height than the latter. The plants in the lower strata, i.e., the lichens die, and the mosses grow. The mosses form cushion-like structure that may be a few centimetres in thickness. The substratum is thus gradually built up and is widened. The foliose lichens gradually give way to mosses that overtop the lichens. Many times, all three stages may be found on a single rock surface, the pioneers occupying the most exposed places.


Related Discussions:- Moss stage - xerarch

What is anabolism, Q. What is Anabolism? Anabolism Anabolism is a pr...

Q. What is Anabolism? Anabolism Anabolism is a process of synthesis or making of larger or complex molecules from smaller molecules. These molecules are of different kinds l

What happens during aerobic respiration to the pyruvic acid, What happens d...

What happens during aerobic respiration to the pyruvic acid molecules made by glycolysis? What is the sequence of reactions that then follows? The pyruvic acid molecules made i

What is the endoplasmic reticulum, What is the Endoplasmic Reticulum Th...

What is the Endoplasmic Reticulum The cytoplasm of most eukaryotic cells contains a very complex network of internal membranes, called the endoplasmic reticulum, which forms ch

What is capillarity, What is capillarity? How this phenomenon is chemical...

What is capillarity? How this phenomenon is chemically explained? What is the relevance of capillarity for water transport in plants? Capillarity is the phenomenon by which

Explain the law of segregation, Explain how the events of meiosis account f...

Explain how the events of meiosis account for the law of segregation and the law of independent assortment. In meiosis, the two alleles of every gene are segregated when the tw

Types of fats, FATS ARE OF TWO TYPES (a) Hard Fats They are t...

FATS ARE OF TWO TYPES (a) Hard Fats They are true fats which are solid at room temperature of 20 o C. It is due to presence of long chain saturated fatty acid

Biota of pelagic zone, Biota of Pelagic Zone Pelagic region constitute...

Biota of Pelagic Zone Pelagic region constitutes 90 per cent of the total ocean surface and is less rich in species and numbers of organisms than the two regions discussed bef

Explain back pain, Explain Back pain, arthritis and gout - Effect of Obesit...

Explain Back pain, arthritis and gout - Effect of Obesity? Abdominal obesity increases the risk of back pain because of the extra load on the spinal column. This, in turn, red

Is crossing over important diversity of biological evolution, Is crossing o...

Is crossing over important for the diversity of biological evolution? The Sexual reproduction and the recombination of linked genes (crossing over) are, along with mutations, t

#virus, how do retroviruses reproduce?

how do retroviruses reproduce?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd